Update SNAPSHOT to 4.2.2

Signed-off-by: Olga Maciaszek-Sharma <olga.maciaszek-sharma@broadcom.com>

.github/CONTRIBUTING.md

@@ -17,7 +17,7 @@ given the ability to merge pull requests.
 
 ## Code of Conduct
 This project adheres to the Contributor Covenant [code of
-conduct](https://github.com/spring-cloud/spring-cloud-build/blob/main/docs/src/main/asciidoc/code-of-conduct.adoc). By participating, you  are expected to uphold this code. Please report
+conduct](https://github.com/spring-cloud/spring-cloud-build/blob/main/docs/modules/ROOT/partials/code-of-conduct.adoc). By participating, you  are expected to uphold this code. Please report
 unacceptable behavior to spring-code-of-conduct@pivotal.io.
 
 ## Code Conventions and Housekeeping

.github/dco.yml

@@ -0,0 +1,2 @@
+require:
+  members: false

.github/dependabot.yml

@@ -10,6 +10,11 @@ updates:
     target-branch: "4.0.x" # oldest OSS supported branch
     schedule:
       interval: "weekly"
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    target-branch: "4.1.x"
+    schedule:
+      interval: "weekly"
   - package-ecosystem: "github-actions"
     directory: "/"
     target-branch: "main"
@@ -37,6 +42,17 @@ updates:
         update-types:
           - version-update:semver-major
           - version-update:semver-minor
+  - package-ecosystem: maven
+    directory: /
+    schedule:
+      interval: daily
+    target-branch: 4.1.x
+    ignore:
+      # only upgrade patch versions for maintenance branch
+      - dependency-name: "*"
+        update-types:
+          - version-update:semver-major
+          - version-update:semver-minor
   - package-ecosystem: maven
     directory: /
     schedule:
@@ -46,4 +62,19 @@ updates:
       # only upgrade by minor or patch
       - dependency-name: "*"
         update-types:
-          - version-update:semver-major
+          - version-update:semver-major
+  - package-ecosystem: npm
+    target-branch: docs-build
+    directory: /
+    schedule:
+      interval: weekly
+  - package-ecosystem: npm
+    target-branch: main
+    directory: /docs
+    schedule:
+      interval: weekly
+  - package-ecosystem: npm
+    target-branch: 4.1.x
+    directory: /docs
+    schedule:
+      interval: weekly

.github/workflows/maven.yml

@@ -5,9 +5,9 @@ name: Build
 
 on:
   push:
-    branches: [ main ]
+    branches: [ main, 4.1.x ]
   pull_request:
-    branches: [ main ]
+    branches: [ main, 4.1.x ]
 
 jobs:
   build:
@@ -28,6 +28,6 @@ jobs:
           cache: 'maven'
       - name: Build with Maven
         run: ./mvnw clean install -B -U -P sonar
-      - uses: codecov/codecov-action@v3
+      - uses: codecov/codecov-action@v5
         with:
           fail_ci_if_error: false

.gitignore

@@ -33,5 +33,5 @@ _configprops.adoc
 _spans.adoc
 _metrics.adoc
 _conventions.adoc
-package.json
+/package.json
 package-lock.json

README.adoc

@@ -49,7 +49,7 @@ build succeed, please raise a ticket to get the settings added to
 source control.
 
 The projects that require middleware (i.e. Redis) for testing generally
-require that a local instance of [Docker](https://www.docker.com/get-started) is installed and running.
+require that a local instance of https://www.docker.com/get-started[Docker] is installed and running.
 
 [[documentation]]
 == Documentation
@@ -68,7 +68,7 @@ a modified file in the correct place. Just commit it and push the change.
 [[working-with-the-code]]
 == Working with the code
 If you don't have an IDE preference we would recommend that you use
-https://www.springsource.com/developer/sts[Spring Tools Suite] or
+https://spring.io/tools[Spring Tools Suite] or
 https://eclipse.org[Eclipse] when working with the code. We use the
 https://eclipse.org/m2e/[m2eclipse] eclipse plugin for maven support. Other IDEs and tools
 should also work without issue as long as they use Maven 3.3.3 or better.

docs/antora-playbook.yml

@@ -1,13 +1,7 @@
 antora:
   extensions:
-    - '@springio/antora-extensions/partial-build-extension'
-    - require: '@springio/antora-extensions/latest-version-extension'
-    - require: '@springio/antora-extensions/inject-collector-cache-config-extension'
-    - '@antora/collector-extension'
-    - '@antora/atlas-extension'
-    - require: '@springio/antora-extensions/root-component-extension'
+    - require: '@springio/antora-extensions'
       root_component_name: 'cloud-netflix'
-    - '@springio/antora-extensions/static-page-extension'
 site:
   title: Spring Cloud Netflix
   url: https://docs.spring.io/spring-cloud-netflix/reference/
@@ -36,4 +30,4 @@ runtime:
     format: pretty
 ui:
   bundle:
-    url: https://github.com/spring-io/antora-ui-spring/releases/download/v0.4.2/ui-bundle.zip
+    url: https://github.com/spring-io/antora-ui-spring/releases/download/v0.4.15/ui-bundle.zip

docs/antora.yml

@@ -6,7 +6,7 @@ nav:
 ext:
   collector:
     run:
-      command: ./mvnw --no-transfer-progress -B process-resources -Pdocs -pl docs -Dantora-maven-plugin.phase=none -Dgenerate-docs.phase=none -Dgenerate-readme.phase=none -Dgenerate-cloud-resources.phase=none -Dmaven-dependency-plugin-for-docs.phase=none -Dmaven-dependency-plugin-for-docs-classes.phase=none -DskipTests
+      command: ./mvnw --no-transfer-progress -B process-resources -Pdocs -pl docs -Dantora-maven-plugin.phase=none -Dgenerate-docs.phase=none -Dgenerate-readme.phase=none -Dgenerate-cloud-resources.phase=none -Dmaven-dependency-plugin-for-docs.phase=none -Dmaven-dependency-plugin-for-docs-classes.phase=none -DskipTests -DdisableConfigurationProperties
       local: true
     scan:
       dir: ./target/classes/antora-resources/

docs/modules/ROOT/pages/spring-cloud-netflix.adoc

@@ -35,8 +35,9 @@ public class Application {
     }
 
     public static void main(String[] args) {
-        new SpringApplicationBuilder(Application.class).web(true).run(args);
-    }
+		SpringApplication.run(CustomerServiceTestApplication.class, args);
+	}
+
 
 }
 ----
@@ -97,19 +98,39 @@ NOTE: Because of a limitation in Eureka, it is not possible to support per-serve
 
 If you want to customize the RestTemplate used by the Eureka HTTP Client you may want to create a bean of `EurekaClientHttpRequestFactorySupplier` and provide your own logic for generating a `ClientHttpRequestFactory` instance.
 
-All default timeout-related properties for RestTemplate used by the Eureka HTTP Client are set to 3 minutes (in keeping with Apache HC5 default `RequestConfig` and `SocketConfig`). Therefore, to specify the timeout values, you must specify the value directly with the properties in `eureka.client.rest-template-timeout`. (All timeout properties are in milliseconds.)
+All default timeout-related properties for RestTemplate and RestClient used by the Eureka HTTP Client are set to 3 minutes (in keeping with Apache HC5 default `RequestConfig` and `SocketConfig`). Therefore, to specify the timeout values, you must specify the value directly with the properties in `eureka.client.rest-template-timeout` or `eureka.client.restclient.timeout`. All timeout properties are in milliseconds.
 
 .application.yml
 [source,yaml]
 ----
 eureka:
   client:
+    restclient:
+      timeout:
+        connect-timeout: 5000
+        connect-request-timeout: 8000
+        socket-timeout: 10000
     rest-template-timeout:
       connect-timeout: 5000
       connect-request-timeout: 8000
       socket-timeout: 10000
 ----
 
+You can also customise the `RequestConfig` for the underlying Apache HttpClient 5 by creating a bean of type `EurekaClientHttpRequestFactorySupplier.RequestConfigCustomizer`:
+
+[source,java,indent=0]
+----
+@Configuration
+public class RestClientConfiguration {
+
+	@Bean
+	EurekaClientHttpRequestFactorySupplier.RequestConfigCustomizer requestConfigCustomizer() {
+		return builder -> builder.setProtocolUpgradeEnabled(false);
+	}
+
+}
+----
+
 === Status Page and Health Indicator
 
 The status page and health indicators for a Eureka instance default to `/info` and `/health` respectively, which are the default locations of useful endpoints in a Spring Boot Actuator application.
@@ -267,27 +288,41 @@ Do not use the `EurekaClient` in a `@PostConstruct` method or in a `@Scheduled`
 It is initialized in a `SmartLifecycle` (with `phase=0`), so the earliest you can rely on it being available is in another `SmartLifecycle` with a higher phase.
 ====
 
-==== EurekaClient with Jersey
+==== Underlying HTTP clients
+
+`EurekaClient` uses either `RestClient`, `RestTemplate`, `WebClient` or `JerseyClient` under the hood. In order to use the `EurekaClient`, you need to have one of the supported HTTP clients on your classpath.
+
+To use `RestTemplate` or `RestClient`, add `spring-boot-starter-web` to your dependencies. To use `WebClient`, add `spring-boot-starter-webflux` to your dependencies. If both `spring-boot-starter-web`
+and `spring-boot-starter-webflux` are included in the dependencies and the `eureka.client.webclient.enabled` flag is set to `true`,
+then `WebClient` will be used. If that's not the case and `eureka.client.restclient.enabled` is set to `true`, `RestClient` will be used. Otherwise, `RestTemplate` will be used.
+
+NOTE: For any of those client implementations, if there's a builder bean available, it will be used to create the underlying client.
+
+NOTE: We're planning on changing the default client to `RestClient` with the next major release.
 
-By default, EurekaClient uses Spring's `RestTemplate` for HTTP communication.
 If you wish to use Jersey instead, you need to add the Jersey dependencies to your classpath.
 The following example shows the dependencies you need to add:
 
+[source,xml]
 ----
-<dependency>
-    <groupId>com.sun.jersey</groupId>
-    <artifactId>jersey-client</artifactId>
-</dependency>
-<dependency>
-    <groupId>com.sun.jersey</groupId>
-    <artifactId>jersey-core</artifactId>
-</dependency>
-<dependency>
-    <groupId>com.sun.jersey.contribs</groupId>
-    <artifactId>jersey-apache-client4</artifactId>
-</dependency>
+<dependencies>
+    <dependency>
+        <groupId>com.sun.jersey</groupId>
+        <artifactId>jersey-client</artifactId>
+    </dependency>
+    <dependency>
+        <groupId>com.sun.jersey</groupId>
+        <artifactId>jersey-core</artifactId>
+    </dependency>
+    <dependency>
+        <groupId>com.sun.jersey.contribs</groupId>
+        <artifactId>jersey-apache-client4</artifactId>
+    </dependency>
+</dependencies>
 ----
 
+If you have `JerseyClient` on the classpath but do not wish to use it in your `EuerekaClient`, make sure to set `eureka.client.jersey.enabled` to `false`.
+
 === Alternatives to the Native Netflix EurekaClient
 
 You need not use the raw Netflix `EurekaClient`.
@@ -368,7 +403,9 @@ We take `eureka.client.availabilityZones`, which is a map from region name to a
 
 Spring Cloud Netflix Eureka Client integration supports Spring AOT transformations and native images, however, only with refresh mode disabled.
 
-WARNING: If you want to run Eureka Client in AOT or native image modes, make sure to set `spring.cloud.refresh.enabled` to `false`
+WARNING: If you want to run Eureka Client in AOT or native image modes, make sure to set `spring.cloud.refresh.enabled` to `false`.
+
+NOTE:  Given the AOT and native image closed-world assumption, using random port with Eureka clients is not supported for ahead of time compilation or native images.
 
 [[spring-cloud-eureka-server]]
 == Service Discovery: Eureka Server
@@ -403,8 +440,9 @@ The following example shows a minimal Eureka server:
 public class Application {
 
     public static void main(String[] args) {
-        new SpringApplicationBuilder(Application.class).web(true).run(args);
-    }
+		SpringApplication.run(CustomerServiceTestApplication.class, args);
+	}
+
 
 }
 ----
@@ -598,6 +636,17 @@ when running a Eureka server you must include these dependencies in your POM or
 
 Spring Cloud Netflix Eureka Server does not support Spring AOT transformations or native images.
 
+=== Metrics
+
+`EurekaInstanceMonitor` listens to events related to Eureka instance registration and creates/updates `Gauge`s for Eureka instance information in Micrometer's `MeterRegistry`. By default, this behavior is disabled. If you want to enable it, you need to set `eureka.server.metrics.enabled` to `true`.
+
+By default, the `Gauge`s are named `eureka.server.instances` and have the following tags:
+
+- `application`: application name
+- `status`: instance status (`UP`, `DOWN`, `STARTING`, `OUT_OF_SERVICE`, `UNKNOWN`, see: `com.netflix.appinfo.InstanceInfo.InstanceStatus`)
+
+You can add additional tags by injecting your own implementation of `EurekaInstanceTagsProvider`.
+
 == Configuration properties
 
 To see the list of all Spring Cloud Netflix related configuration properties please check link:appendix.html[the Appendix page].

docs/modules/ROOT/partials/_configprops.adoc

@@ -21,7 +21,7 @@
 |eureka.client.eureka-server-total-connections | `+++200+++` | Gets the total number of connections that is allowed from eureka client to all eureka servers.
 |eureka.client.eureka-server-total-connections-per-host | `+++50+++` | Gets the total number of connections that is allowed from eureka client to a eureka server host.
 |eureka.client.eureka-server-u-r-l-context |  | Gets the URL context to be used to construct the service url to contact eureka server when the list of eureka servers come from the DNS. This information is not required if the contract returns the service urls from eurekaServerServiceUrls. The DNS mechanism is used when useDnsForFetchingServiceUrls is set to true and the eureka client expects the DNS to configured a certain way so that it can fetch changing eureka servers dynamically. The changes are effective at runtime.
-|eureka.client.eureka-service-url-poll-interval-seconds | `+++0+++` | Indicates how often(in seconds) to poll for changes to eureka server information. Eureka servers could be added or removed and this setting controls how soon the eureka clients should know about it.
+|eureka.client.eureka-service-url-poll-interval-seconds | `+++300+++` | Indicates how often(in seconds) to poll for changes to eureka server information. Eureka servers could be added or removed and this setting controls how soon the eureka clients should know about it.
 |eureka.client.fetch-registry | `+++true+++` | Indicates whether this client should fetch eureka registry information from eureka server.
 |eureka.client.fetch-remote-regions-registry |  | Comma separated list of regions for which the eureka registry information will be fetched. It is mandatory to define the availability zones for each of these regions as returned by availabilityZones. Failing to do so, will result in failure of discovery client startup.
 |eureka.client.filter-only-up-instances | `+++true+++` | Indicates whether to get the applications after filtering the applications for instances with only InstanceStatus UP states.
@@ -31,6 +31,7 @@
 |eureka.client.heartbeat-executor-thread-pool-size | `+++2+++` | The thread pool size for the heartbeatExecutor to initialise with.
 |eureka.client.initial-instance-info-replication-interval-seconds | `+++40+++` | Indicates how long initially (in seconds) to replicate instance info to the eureka server.
 |eureka.client.instance-info-replication-interval-seconds | `+++30+++` | Indicates how often(in seconds) to replicate instance changes to be replicated to the eureka server.
+|eureka.client.jersey.enabled | `+++true+++` | Enables the use of JerseyClient for Eureka HTTP Client.
 |eureka.client.log-delta-diff | `+++false+++` | Indicates whether to log differences between the eureka server and the eureka client in terms of registry information. Eureka client tries to retrieve only delta changes from eureka server to minimize network traffic. After receiving the deltas, eureka client reconciles the information from the server to verify it has not missed out some information. Reconciliation failures could happen when the client has had network issues communicating to server.If the reconciliation fails, eureka client gets the full registry information. While getting the full registry information, the eureka client can log the differences between the client and the server and this setting controls that. The changes are effective at runtime at the next registry fetch cycle as specified by registryFetchIntervalSecondsr
 |eureka.client.on-demand-update-status-change | `+++true+++` | If set to true, local status updates via ApplicationInfoManager will trigger on-demand (but rate limited) register/updates to remote eureka servers.
 |eureka.client.order | `+++0+++` | Order of the discovery client used by `CompositeDiscoveryClient` for sorting available clients.
@@ -45,9 +46,13 @@
 |eureka.client.register-with-eureka | `+++true+++` | Indicates whether or not this instance should register its information with eureka server for discovery by others. In some cases, you do not want your instances to be discovered whereas you just want do discover other instances.
 |eureka.client.registry-fetch-interval-seconds | `+++30+++` | Indicates how often(in seconds) to fetch the registry information from the eureka server.
 |eureka.client.registry-refresh-single-vip-address |  | Indicates whether the client is only interested in the registry information for a single VIP.
-|eureka.client.rest-template-timeout.connect-request-timeout | `+++0+++` | 
-|eureka.client.rest-template-timeout.connect-timeout | `+++0+++` | Default values are set to 180000, in keeping with {@link RequestConfig} and {@link SocketConfig} defaults.
-|eureka.client.rest-template-timeout.socket-timeout | `+++0+++` | 
+|eureka.client.rest-template-timeout.connect-request-timeout | `+++180000+++` | 
+|eureka.client.rest-template-timeout.connect-timeout | `+++180000+++` | Default values are set to 180000, in keeping with {@link RequestConfig} and {@link SocketConfig} defaults.
+|eureka.client.rest-template-timeout.socket-timeout | `+++180000+++` | 
+|eureka.client.restclient.enabled | `+++false+++` | Enables the use of RestClient for Eureka HTTP Client.
+|eureka.client.restclient.timeout.connect-request-timeout | `+++180000+++` | 
+|eureka.client.restclient.timeout.connect-timeout | `+++180000+++` | Default values are set to 180000, in keeping with {@link RequestConfig} and {@link SocketConfig} defaults.
+|eureka.client.restclient.timeout.socket-timeout | `+++180000+++` | 
 |eureka.client.service-url |  | Map of availability zone to list of fully qualified URLs to communicate with eureka server. Each value can be a single URL or a comma separated list of alternative locations. Typically the eureka server URLs carry protocol,host,port,context and version information if any. Example: https://ec2-256-156-243-129.compute-1.amazonaws.com:7001/eureka/ The changes are effective at runtime at the next service url refresh cycle as specified by eurekaServiceUrlPollIntervalSeconds.
 |eureka.client.should-enforce-registration-at-init | `+++false+++` | Indicates whether the client should enforce registration during initialization. Defaults to false.
 |eureka.client.should-unregister-on-shutdown | `+++true+++` | Indicates whether the client should explicitly unregister itself from the remote server on client shutdown.
@@ -68,6 +73,7 @@
 |eureka.instance.a-s-g-name |  | Gets the AWS autoscaling group name associated with this instance. This information is specifically used in an AWS environment to automatically put an instance out of service after the instance is launched and it has been disabled for traffic..
 |eureka.instance.app-group-name |  | Get the name of the application group to be registered with eureka.
 |eureka.instance.appname | `+++unknown+++` | Get the name of the application to be registered with eureka.
+|eureka.instance.async-client-initialization | `+++false+++` | If true the EurekaClient will be initialized asynchronously when the InstanceRegistry bean is created.
 |eureka.instance.data-center-info |  | Returns the data center this instance is deployed. This information is used to get some AWS specific instance information if the instance is deployed in AWS.
 |eureka.instance.default-address-resolution-order | `+++[]+++` | 
 |eureka.instance.environment |  | 
@@ -76,7 +82,7 @@
 |eureka.instance.home-page-url |  | Gets the absolute home page URL for this instance. The users can provide the homePageUrlPath if the home page resides in the same instance talking to eureka, else in the cases where the instance is a proxy for some other server, users can provide the full URL. If the full URL is provided it takes precedence. It is normally used for informational purposes for other services to use it as a landing page. The full URL should follow the format http://${eureka.hostname}:7001/ where the value ${eureka.hostname} is replaced at runtime.
 |eureka.instance.home-page-url-path | `+++/+++` | Gets the relative home page URL Path for this instance. The home page URL is then constructed out of the hostName and the type of communication - secure or unsecure. It is normally used for informational purposes for other services to use it as a landing page.
 |eureka.instance.hostname |  | The hostname if it can be determined at configuration time (otherwise it will be guessed from OS primitives).
-|eureka.instance.initial-status |  | Initial status to register with remote Eureka server.
+|eureka.instance.initial-status | `+++up+++` | Initial status to register with remote Eureka server.
 |eureka.instance.instance-enabled-onit | `+++false+++` | Indicates whether the instance should be enabled for taking traffic as soon as it is registered with eureka. Sometimes the application might need to do some pre-processing before it is ready to take traffic.
 |eureka.instance.instance-id |  | Get the unique Id (within the scope of the appName) of this instance to be registered with eureka.
 |eureka.instance.ip-address |  | Get the IPAdress of the instance. This information is for academic purposes only as the communication from other instances primarily happen using the information supplied in {@link #getHostName(boolean)}.
@@ -97,20 +103,20 @@
 |eureka.instance.status-page-url |  | Gets the absolute status page URL path for this instance. The users can provide the statusPageUrlPath if the status page resides in the same instance talking to eureka, else in the cases where the instance is a proxy for some other server, users can provide the full URL. If the full URL is provided it takes precedence. It is normally used for informational purposes for other services to find about the status of this instance. Users can provide a simple HTML indicating what is the current status of the instance.
 |eureka.instance.status-page-url-path |  | Gets the relative status page URL path for this instance. The status page URL is then constructed out of the hostName and the type of communication - secure or unsecure as specified in securePort and nonSecurePort. It is normally used for informational purposes for other services to find about the status of this instance. Users can provide a simple HTML indicating what is the current status of the instance.
 |eureka.instance.virtual-host-name | `+++unknown+++` | Gets the virtual host name defined for this instance. This is typically the way other instance would find this instance by using the virtual host name.Think of this as similar to the fully qualified domain name, that the users of your services will need to find this instance.
-|eureka.server.a-s-g-cache-expiry-timeout-ms | `+++0+++` | 
+|eureka.server.a-s-g-cache-expiry-timeout-ms | `+++600000+++` | 
 |eureka.server.a-s-g-query-timeout-ms | `+++300+++` | 
-|eureka.server.a-s-g-update-interval-ms | `+++0+++` | 
+|eureka.server.a-s-g-update-interval-ms | `+++300000+++` | 
 |eureka.server.a-w-s-access-id |  | 
 |eureka.server.a-w-s-secret-key |  | 
 |eureka.server.batch-replication | `+++false+++` | 
-|eureka.server.binding-strategy |  | 
-|eureka.server.delta-retention-timer-interval-in-ms | `+++0+++` | 
+|eureka.server.binding-strategy | `+++eip+++` | 
+|eureka.server.delta-retention-timer-interval-in-ms | `+++30000+++` | 
 |eureka.server.disable-delta | `+++false+++` | 
 |eureka.server.disable-delta-for-remote-regions | `+++false+++` | 
 |eureka.server.disable-transparent-fallback-to-other-region | `+++false+++` | 
 |eureka.server.e-i-p-bind-rebind-retries | `+++3+++` | 
-|eureka.server.e-i-p-binding-retry-interval-ms | `+++0+++` | 
-|eureka.server.e-i-p-binding-retry-interval-ms-when-unbound | `+++0+++` | 
+|eureka.server.e-i-p-binding-retry-interval-ms | `+++300000+++` | 
+|eureka.server.e-i-p-binding-retry-interval-ms-when-unbound | `+++60000+++` | 
 |eureka.server.enable-replicated-request-compression | `+++false+++` | 
 |eureka.server.enable-self-preservation | `+++true+++` | 
 |eureka.server.eviction-interval-timer-in-ms | `+++0+++` | 
@@ -127,12 +133,13 @@
 |eureka.server.max-threads-for-peer-replication | `+++20+++` | 
 |eureka.server.max-threads-for-status-replication | `+++1+++` | 
 |eureka.server.max-time-for-replication | `+++30000+++` | 
+|eureka.server.metrics.enabled | `+++false+++` | Indicates whether the metrics should be enabled for eureka instances.
 |eureka.server.min-available-instances-for-peer-replication | `+++-1+++` | 
 |eureka.server.min-threads-for-peer-replication | `+++5+++` | 
 |eureka.server.min-threads-for-status-replication | `+++1+++` | 
 |eureka.server.my-url |  | 
 |eureka.server.number-of-replication-retries | `+++5+++` | 
-|eureka.server.peer-eureka-nodes-update-interval-ms | `+++0+++` | 
+|eureka.server.peer-eureka-nodes-update-interval-ms | `+++600000+++` | 
 |eureka.server.peer-eureka-status-refresh-time-interval-ms | `+++0+++` | 
 |eureka.server.peer-node-connect-timeout-ms | `+++200+++` | 
 |eureka.server.peer-node-connection-idle-timeout-seconds | `+++30+++` | 
@@ -162,18 +169,18 @@
 |eureka.server.remote-region-urls |  | 
 |eureka.server.remote-region-urls-with-name |  | 
 |eureka.server.renewal-percent-threshold | `+++0.85+++` | 
-|eureka.server.renewal-threshold-update-interval-ms | `+++0+++` | 
+|eureka.server.renewal-threshold-update-interval-ms | `+++900000+++` | 
 |eureka.server.response-cache-auto-expiration-in-seconds | `+++180+++` | 
-|eureka.server.response-cache-update-interval-ms | `+++0+++` | 
-|eureka.server.retention-time-in-m-s-in-delta-queue | `+++0+++` | 
+|eureka.server.response-cache-update-interval-ms | `+++30000+++` | 
+|eureka.server.retention-time-in-m-s-in-delta-queue | `+++180000+++` | 
 |eureka.server.route53-bind-rebind-retries | `+++3+++` | 
-|eureka.server.route53-binding-retry-interval-ms | `+++0+++` | 
+|eureka.server.route53-binding-retry-interval-ms | `+++300000+++` | 
 |eureka.server.route53-domain-t-t-l | `+++30+++` | 
 |eureka.server.sync-when-timestamp-differs | `+++true+++` | 
 |eureka.server.use-read-only-response-cache | `+++true+++` | 
-|eureka.server.wait-time-in-ms-when-sync-empty | `+++0+++` | 
+|eureka.server.wait-time-in-ms-when-sync-empty | `+++300000+++` | 
 |eureka.server.xml-codec-name |  | 
-|spring.cloud.compatibility-verifier.compatible-boot-versions | `+++3.2.x+++` | Default accepted versions for the Spring Boot dependency. You can set {@code x} for the patch version if you don't want to specify a concrete value. Example: {@code 3.4.x}
+|spring.cloud.compatibility-verifier.compatible-boot-versions | `+++3.4.x+++` | Default accepted versions for the Spring Boot dependency. You can set {@code x} for the patch version if you don't want to specify a concrete value. Example: {@code 3.4.x}
 |spring.cloud.compatibility-verifier.enabled | `+++false+++` | Enables creation of Spring Cloud compatibility verification.
 |spring.cloud.config.allow-override | `+++true+++` | Flag to indicate that {@link #isOverrideSystemProperties() systemPropertiesOverride} can be used. Set to false to prevent users from changing the default accidentally. Default true.
 |spring.cloud.config.initialize-on-context-refresh | `+++false+++` | Flag to initialize bootstrap configuration on context refresh event. Default false.
@@ -217,7 +224,6 @@
 |spring.cloud.loadbalancer.eureka.approximate-zone-from-hostname | `+++false+++` | Used to determine whether we should try to get the `zone` value from host name.
 |spring.cloud.loadbalancer.health-check.initial-delay | `+++0+++` | Initial delay value for the HealthCheck scheduler.
 |spring.cloud.loadbalancer.health-check.interval | `+++25s+++` | Interval for rerunning the HealthCheck scheduler.
-|spring.cloud.loadbalancer.health-check.interval  | `+++25s+++` | Interval for rerunning the HealthCheck scheduler.
 |spring.cloud.loadbalancer.health-check.path |  | Path at which the health-check request should be made. Can be set up per `serviceId`. A `default` value can be set up as well. If none is set up, `/actuator/health` will be used.
 |spring.cloud.loadbalancer.health-check.port |  | Path at which the health-check request should be made. If none is set, the port under which the requested service is available at the service instance.
 |spring.cloud.loadbalancer.health-check.refetch-instances | `+++false+++` | Indicates whether the instances should be refetched by the `HealthCheckServiceInstanceListSupplier`. This can be used if the instances can be updated and the underlying delegate does not provide an ongoing flux.
@@ -239,6 +245,7 @@
 |spring.cloud.loadbalancer.retry.retryable-exceptions | `+++{}+++` | A `Set` of `Throwable` classes that should trigger a retry.
 |spring.cloud.loadbalancer.retry.retryable-status-codes | `+++{}+++` | A `Set` of status codes that should trigger a retry.
 |spring.cloud.loadbalancer.service-discovery.timeout |  | String representation of Duration of the timeout for calls to service discovery.
+|spring.cloud.loadbalancer.stats.include-path | `+++true+++` | Indicates whether the {@code path} should be added to {@code uri} tag in metrics. When {@link RestTemplate} is used to execute load-balanced requests with high cardinality paths, setting it to {@code false} is recommended.
 |spring.cloud.loadbalancer.stats.micrometer.enabled | `+++false+++` | Enables Spring Cloud LoadBalancer Micrometer stats.
 |spring.cloud.loadbalancer.sticky-session.add-service-instance-cookie | `+++false+++` | Indicates whether a cookie with the newly selected instance should be added by LoadBalancer.
 |spring.cloud.loadbalancer.sticky-session.instance-id-cookie-name | `+++sc-lb-instance-id+++` | The name of the cookie holding the preferred instance id.
@@ -248,8 +255,8 @@
 |spring.cloud.loadbalancer.zone |  | Spring Cloud LoadBalancer zone.
 |spring.cloud.refresh.additional-property-sources-to-retain |  | Additional property sources to retain during a refresh. Typically only system property sources are retained. This property allows property sources, such as property sources created by EnvironmentPostProcessors to be retained as well.
 |spring.cloud.refresh.enabled | `+++true+++` | Enables autoconfiguration for the refresh scope and associated features.
-|spring.cloud.refresh.extra-refreshable | `+++true+++` | Additional class names for beans to post process into refresh scope.
-|spring.cloud.refresh.never-refreshable | `+++true+++` | Comma separated list of class names for beans to never be refreshed or rebound.
+|spring.cloud.refresh.extra-refreshable | `+++true+++` | Additional bean names or class names for beans to post process into refresh scope.
+|spring.cloud.refresh.never-refreshable | `+++true+++` | Comma separated list of bean names or class names for beans to never be refreshed or rebound.
 |spring.cloud.refresh.on-restart.enabled | `+++true+++` | Enable refreshing context on start.
 |spring.cloud.service-registry.auto-registration.enabled | `+++true+++` | Whether service auto-registration is enabled. Defaults to true.
 |spring.cloud.service-registry.auto-registration.fail-fast | `+++false+++` | Whether startup fails if there is no AutoServiceRegistration. Defaults to false.

docs/package.json

@@ -0,0 +1,10 @@
+{
+  "dependencies": {
+    "antora": "3.2.0-alpha.8",
+    "@antora/atlas-extension": "1.0.0-alpha.2",
+    "@antora/collector-extension": "1.0.1",
+    "@asciidoctor/tabs": "1.0.0-beta.6",
+    "@springio/antora-extensions": "1.14.4",
+    "@springio/asciidoctor-extensions": "1.0.0-alpha.17"
+  }
+}

docs/pom.xml

@@ -8,7 +8,7 @@
 	<parent>
 		<groupId>org.springframework.cloud</groupId>
 		<artifactId>spring-cloud-netflix</artifactId>
-		<version>4.1.1-SNAPSHOT</version>
+		<version>4.2.2</version>
 		<relativePath>..</relativePath>
 	</parent>
 	<packaging>jar</packaging>
@@ -21,20 +21,28 @@
 		<!-- Don't upload docs jar to central / repo.spring.io -->
 		<maven-deploy-plugin-default.phase>none</maven-deploy-plugin-default.phase>
 	</properties>
-	<dependencies>
-		<dependency>
-			<groupId>${project.groupId}</groupId>
-			<artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
-		</dependency>
-		<dependency>
-			<groupId>${project.groupId}</groupId>
-			<artifactId>spring-cloud-starter-netflix-eureka-server</artifactId>
-		</dependency>
-	</dependencies>
 	<build>
 		<sourceDirectory>src/main/asciidoc</sourceDirectory>
 	</build>
 	<profiles>
+		<profile>
+			<id>enable-configuration-properties</id>
+			<activation>
+				<property>
+					<name>!disableConfigurationProperties</name>
+				</property>
+			</activation>
+			<dependencies>
+				<dependency>
+					<groupId>${project.groupId}</groupId>
+					<artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
+				</dependency>
+				<dependency>
+					<groupId>${project.groupId}</groupId>
+					<artifactId>spring-cloud-starter-netflix-eureka-server</artifactId>
+				</dependency>
+			</dependencies>
+		</profile>
 		<profile>
 			<id>docs</id>
 			<build>
@@ -62,7 +70,7 @@
 						<artifactId>antora-component-version-maven-plugin</artifactId>
 					</plugin>
 					<plugin>
-						<groupId>io.spring.maven.antora</groupId>
+						<groupId>org.antora</groupId>
 						<artifactId>antora-maven-plugin</artifactId>
 					</plugin>
 					<plugin>
@@ -70,6 +78,7 @@
 						<artifactId>maven-antrun-plugin</artifactId>
 					</plugin>
 					<plugin>
+						<groupId>org.apache.maven.plugins</groupId>
 						<artifactId>maven-deploy-plugin</artifactId>
 					</plugin>
 				</plugins>

pom.xml

@@ -3,14 +3,15 @@
 	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
 	<modelVersion>4.0.0</modelVersion>
 	<artifactId>spring-cloud-netflix</artifactId>
-	<version>4.1.1-SNAPSHOT</version>
+	<version>4.2.2</version>
 	<packaging>pom</packaging>
 	<name>Spring Cloud Netflix</name>
 	<description>Spring Cloud Netflix</description>
+	<url>https://github.com/spring-cloud/spring-cloud-netflix</url>
 	<parent>
 		<groupId>org.springframework.cloud</groupId>
 		<artifactId>spring-cloud-build</artifactId>
-		<version>4.1.1-SNAPSHOT</version>
+		<version>4.2.2</version>
 		<relativePath />
 	</parent>
 	<scm>
@@ -19,11 +20,69 @@
 		<developerConnection>scm:git:ssh://git@github.com/spring-cloud/spring-cloud-netflix.git</developerConnection>
 		<tag>HEAD</tag>
 	</scm>
+	<licenses>
+		<license>
+			<name>Apache License, Version 2.0</name>
+			<url>https://www.apache.org/licenses/LICENSE-2.0</url>
+		</license>
+	</licenses>
+	<developers>
+		<developer>
+			<id>dsyer</id>
+			<name>Dave Syer</name>
+			<email>david.syer at broadcom.com</email>
+			<organization>Broadcom, Inc.</organization>
+			<organizationUrl>https://www.spring.io</organizationUrl>
+			<roles>
+				<role>lead</role>
+			</roles>
+		</developer>
+		<developer>
+			<id>sgibb</id>
+			<name>Spencer Gibb</name>
+			<email>spencer.gibb at broadcom.com</email>
+			<organization>Broadcom, Inc.</organization>
+			<organizationUrl>https://www.spring.io</organizationUrl>
+			<roles>
+				<role>lead</role>
+			</roles>
+		</developer>
+		<developer>
+			<id>mgrzejszczak</id>
+			<name>Marcin Grzejszczak</name>
+			<email>>marcin.grzejszczak at broadcom.com</email>
+			<organization>Broadcom, Inc.</organization>
+			<organizationUrl>https://www.spring.io</organizationUrl>
+			<roles>
+				<role>developer</role>
+			</roles>
+		</developer>
+		<developer>
+			<id>rbaxter</id>
+			<name>Ryan Baxter</name>
+			<email>ryan.baxter at broadcom.com</email>
+			<organization>Broadcom, Inc.</organization>
+			<organizationUrl>https://www.spring.io</organizationUrl>
+			<roles>
+				<role>developer</role>
+			</roles>
+		</developer>
+		<developer>
+			<id>omaciaszeksharma</id>
+			<name>Olga Maciaszek-Sharma</name>
+			<email>olga.maciaszek-sharma at broadcom.com</email>
+			<organization>Broadcom, Inc.</organization>
+			<organizationUrl>https://www.spring.io</organizationUrl>
+			<roles>
+				<role>developer</role>
+			</roles>
+		</developer>
+	</developers>
 	<properties>
 		<bintray.package>netflix</bintray.package>
-		<spring-cloud-commons.version>4.1.1-SNAPSHOT</spring-cloud-commons.version>
-		<spring-cloud-config.version>4.1.1-SNAPSHOT</spring-cloud-config.version>
-		<testcontainers.version>1.19.3</testcontainers.version>
+		<spring-cloud-commons.version>4.2.2</spring-cloud-commons.version>
+		<spring-cloud-config.version>4.2.3</spring-cloud-config.version>
+		<testcontainers.version>1.20.6</testcontainers.version>
 		<mockserverclient.version>5.15.0</mockserverclient.version>
 
 		<!-- Sonar -->
@@ -32,8 +91,6 @@
 		<sonar.jacoco.reportPath>${project.basedir}/../target/jacoco.exec</sonar.jacoco.reportPath>
 		<sonar.language>java</sonar.language>
 		<maven-resources-plugin.version>3.1.0</maven-resources-plugin.version>
-		<!-- FIXME: 4.0.0 -->
-		<duplicate-finder-maven-plugin.skip>true</duplicate-finder-maven-plugin.skip>
 	</properties>
 	<build>
 		<plugins>
@@ -132,6 +189,12 @@
 				<groupId>org.mock-server</groupId>
 				<artifactId>mockserver-client-java</artifactId>
 				<version>${mockserverclient.version}</version>
+				<exclusions>
+					<exclusion>
+						<groupId>commons-logging</groupId>
+						<artifactId>commons-logging</artifactId>
+					</exclusion>
+				</exclusions>
 			</dependency>
 		</dependencies>
 	</dependencyManagement>
@@ -153,6 +216,22 @@
 		<module>docs</module>
     </modules>
 	<profiles>
+		<profile>
+			<id>central</id>
+			<build>
+				<plugins>
+					<plugin>
+						<groupId>org.sonatype.central</groupId>
+						<artifactId>central-publishing-maven-plugin</artifactId>
+						<configuration>
+							<excludeArtifacts>
+								<artifact>spring-cloud-netflix-eureka-client-tls-tests</artifact>
+							</excludeArtifacts>
+						</configuration>
+					</plugin>
+				</plugins>
+			</build>
+		</profile>
 		<profile>
 			<id>spring</id>
 			<repositories>

spring-cloud-netflix-dependencies/pom.xml

@@ -5,16 +5,16 @@
 	<parent>
 		<artifactId>spring-cloud-dependencies-parent</artifactId>
 		<groupId>org.springframework.cloud</groupId>
-		<version>4.1.1-SNAPSHOT</version>
+		<version>4.2.2</version>
 		<relativePath/>
 	</parent>
 	<artifactId>spring-cloud-netflix-dependencies</artifactId>
-	<version>4.1.1-SNAPSHOT</version>
+	<version>4.2.2</version>
 	<packaging>pom</packaging>
 	<name>spring-cloud-netflix-dependencies</name>
 	<description>Spring Cloud Netflix Dependencies</description>
 	<properties>
-		<eureka.version>2.0.1</eureka.version>
+		<eureka.version>2.0.5</eureka.version>
 	</properties>
 	<dependencyManagement>
 		<dependencies>
@@ -138,9 +138,12 @@
 						<groupId>aopalliance</groupId>
 						<artifactId>aopalliance</artifactId>
 					</exclusion>
+					<exclusion>
+						<groupId>commons-logging</groupId>
+						<artifactId>commons-logging</artifactId>
+					</exclusion>
 				</exclusions>
 			</dependency>
-			<!--			TODO: Move back to Eureka dependency when 1.10.17 released -->
 		</dependencies>
 	</dependencyManagement>
 	<profiles>

spring-cloud-netflix-eureka-client-tls-tests/pom.xml

@@ -5,7 +5,7 @@
 	<parent>
 		<groupId>org.springframework.cloud</groupId>
 		<artifactId>spring-cloud-netflix</artifactId>
-		<version>4.1.1-SNAPSHOT</version>
+		<version>4.2.2</version>
 		<relativePath>..</relativePath> <!-- lookup parent from repository -->
 	</parent>
 	<artifactId>spring-cloud-netflix-eureka-client-tls-tests</artifactId>
@@ -92,7 +92,17 @@
 			<artifactId>spring-boot-starter-test</artifactId>
 			<scope>test</scope>
 		</dependency>
-		
+		<dependency>
+			<groupId>org.junit.platform</groupId>
+			<artifactId>junit-platform-suite-api</artifactId>
+			<scope>test</scope>
+		</dependency>
+		<dependency>
+			<groupId>org.junit.platform</groupId>
+			<artifactId>junit-platform-suite-engine</artifactId>
+			<scope>test</scope>
+		</dependency>
+
 		<dependency>
 			<groupId>org.junit.vintage</groupId>
 			<artifactId>junit-vintage-engine</artifactId>

spring-cloud-netflix-eureka-client-tls-tests/src/test/java/org/springframework/cloud/netflix/eureka/AppRunner.java

@@ -48,14 +48,14 @@ public class AppRunner implements AutoCloseable {
 			SpringApplicationBuilder builder = new SpringApplicationBuilder(appClass);
 			builder.properties("spring.application.name=" + appClass.getName());
 			builder.properties("spring.jmx.enabled=false");
-			builder.properties(String.format("server.port=%d", availabeTcpPort()));
+			builder.properties(String.format("server.port=%d", availableTcpPort()));
 			builder.properties(props());
 
 			app = builder.build().run();
 		}
 	}
 
-	private int availabeTcpPort() {
+	private int availableTcpPort() {
 		return TestSocketUtils.findAvailableTcpPort();
 	}
 

spring-cloud-netflix-eureka-client-tls-tests/src/test/java/org/springframework/cloud/netflix/eureka/BaseCertTests.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2018-2022 the original author or authors.
+ * Copyright 2018-2025 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -25,17 +25,17 @@ import java.util.function.Supplier;
 import org.apache.commons.logging.Log;
 import org.apache.commons.logging.LogFactory;
 import org.junit.jupiter.api.AfterAll;
-import org.junit.jupiter.api.Assertions;
 import org.junit.jupiter.api.BeforeAll;
 import org.junit.jupiter.api.Test;
 
 import org.springframework.beans.factory.BeanCreationException;
 
 import static org.assertj.core.api.Assertions.assertThat;
+import static org.assertj.core.api.Assertions.assertThatExceptionOfType;
 
-abstract class BaseCertTest {
+abstract class BaseCertTests {
 
-	private static final Log log = LogFactory.getLog(BaseCertTest.class);
+	private static final Log log = LogFactory.getLog(BaseCertTests.class);
 
 	protected static final String KEY_STORE_PASSWORD = "test-key-store-password";
 
@@ -53,7 +53,7 @@ abstract class BaseCertTest {
 
 	protected static File wrongClientCert;
 
-	protected BaseCertTest() {
+	protected BaseCertTests() {
 	}
 
 	@SuppressWarnings("rawtypes")
@@ -155,15 +155,7 @@ abstract class BaseCertTest {
 		EurekaClientRunner client = createEurekaClient();
 		enableTlsClient(client);
 		client.setKeyStore(clientCert, WRONG_PASSWORD, WRONG_PASSWORD);
-		Assertions.assertThrows(BeanCreationException.class, client::start);
-	}
-
-	@Test
-	void nonExistKeyStoreCauseFailure() {
-		EurekaClientRunner client = createEurekaClient();
-		enableTlsClient(client);
-		client.setKeyStore(new File("nonExistFile"));
-		Assertions.assertThrows(BeanCreationException.class, client::start);
+		assertThatExceptionOfType(BeanCreationException.class).isThrownBy(client::start);
 	}
 
 	@Test

spring-cloud-netflix-eureka-client-tls-tests/src/test/java/org/springframework/cloud/netflix/eureka/EurekaClientSuite.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2018-2022 the original author or authors.
+ * Copyright 2018-2024 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -16,8 +16,8 @@
 
 package org.springframework.cloud.netflix.eureka;
 
-import org.junit.runner.RunWith;
-import org.junit.runners.Suite;
+import org.junit.platform.suite.api.SelectClasses;
+import org.junit.platform.suite.api.Suite;
 
 /**
  * We need to use a suite cause we need to first run all the Eureka Servers, then close
@@ -26,8 +26,8 @@ import org.junit.runners.Suite;
  * That means that when the new context starts we will fail cause the executor service is
  * already shutdown.
  */
-@RunWith(Suite.class)
-@Suite.SuiteClasses({ EurekaClientTest.class, RestTemplateEurekaClientTest.class })
+@SelectClasses({ EurekaClientTests.class, RestTemplateEurekaClientTests.class })
+@Suite
 public class EurekaClientSuite {
 
 }

spring-cloud-netflix-eureka-client-tls-tests/src/test/java/org/springframework/cloud/netflix/eureka/EurekaClientTests.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2018-2022 the original author or authors.
+ * Copyright 2018-2025 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -16,20 +16,25 @@
 
 package org.springframework.cloud.netflix.eureka;
 
+import java.util.Collections;
+
 import org.apache.commons.logging.Log;
 import org.apache.commons.logging.LogFactory;
 import org.junit.jupiter.api.BeforeAll;
 
 import org.springframework.boot.SpringBootConfiguration;
 import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
+import org.springframework.cloud.netflix.eureka.http.DefaultEurekaClientHttpRequestFactorySupplier;
 import org.springframework.cloud.netflix.eureka.http.RestTemplateDiscoveryClientOptionalArgs;
+import org.springframework.cloud.netflix.eureka.http.RestTemplateTransportClientFactories;
 import org.springframework.cloud.netflix.eureka.server.EnableEurekaServer;
+import org.springframework.context.annotation.Bean;
 
 import static org.assertj.core.api.Assertions.assertThat;
 
-public class EurekaClientTest extends BaseCertTest {
+public class EurekaClientTests extends BaseCertTests {
 
-	private static final Log log = LogFactory.getLog(EurekaClientTest.class);
+	private static final Log LOG = LogFactory.getLog(EurekaClientTests.class);
 
 	static EurekaServerRunner server;
 
@@ -37,11 +42,11 @@ public class EurekaClientTest extends BaseCertTest {
 
 	@BeforeAll
 	public static void setupAll() {
-		server = startEurekaServer(EurekaClientTest.TestEurekaServer.class);
-		service = startService(server, EurekaClientTest.TestApp.class);
+		server = startEurekaServer(EurekaClientTests.TestEurekaServer.class);
+		service = startService(server, EurekaClientTests.TestApp.class);
 		assertThat(service.discoveryClientOptionalArgs()).isInstanceOf(RestTemplateDiscoveryClientOptionalArgs.class);
-		log.info("Successfully asserted that Jersey will be used");
-		waitForRegistration(() -> new EurekaClientTest().createEurekaClient());
+		LOG.info("Successfully asserted that Jersey will be used");
+		waitForRegistration(() -> new EurekaClientTests().createEurekaClient());
 	}
 
 	@Override
@@ -53,6 +58,18 @@ public class EurekaClientTest extends BaseCertTest {
 	@EnableAutoConfiguration
 	public static class TestApp {
 
+		@Bean
+		public RestTemplateTransportClientFactories forceRestTemplateTransportClientFactories(
+				RestTemplateDiscoveryClientOptionalArgs discoveryClientOptionalArgs) {
+			return new RestTemplateTransportClientFactories(discoveryClientOptionalArgs);
+		}
+
+		@Bean
+		public RestTemplateDiscoveryClientOptionalArgs discoveryClientOptionalArgs() {
+			return new RestTemplateDiscoveryClientOptionalArgs(new DefaultEurekaClientHttpRequestFactorySupplier(
+					new RestTemplateTimeoutProperties(), Collections.emptySet()));
+		}
+
 	}
 
 	@SpringBootConfiguration

spring-cloud-netflix-eureka-client-tls-tests/src/test/java/org/springframework/cloud/netflix/eureka/RestClientEurekaClientTests.java

@@ -0,0 +1,106 @@
+/*
+ * Copyright 2018-2024 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.cloud.netflix.eureka;
+
+import java.io.IOException;
+import java.security.GeneralSecurityException;
+
+import org.apache.commons.logging.Log;
+import org.apache.commons.logging.LogFactory;
+import org.junit.jupiter.api.AfterAll;
+import org.junit.jupiter.api.BeforeAll;
+
+import org.springframework.boot.SpringBootConfiguration;
+import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
+import org.springframework.cloud.configuration.TlsProperties;
+import org.springframework.cloud.netflix.eureka.http.EurekaClientHttpRequestFactorySupplier;
+import org.springframework.cloud.netflix.eureka.http.RestClientDiscoveryClientOptionalArgs;
+import org.springframework.cloud.netflix.eureka.http.RestClientTransportClientFactories;
+import org.springframework.cloud.netflix.eureka.server.EnableEurekaServer;
+import org.springframework.context.annotation.Bean;
+import org.springframework.web.client.RestClient;
+
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.springframework.cloud.netflix.eureka.config.DiscoveryClientOptionalArgsConfiguration.setupTLS;
+
+/**
+ * Tests for verifying TLS setup with {@link RestClientTransportClientFactories}.
+ *
+ * @author Olga Maciaszek-Sharma
+ */
+public class RestClientEurekaClientTests extends BaseCertTests {
+
+	private static final Log LOG = LogFactory.getLog(RestClientEurekaClientTests.class);
+
+	private static EurekaServerRunner server;
+
+	private static EurekaClientRunner service;
+
+	@BeforeAll
+	public static void setupAll() {
+		server = startEurekaServer(TestEurekaServer.class);
+		service = startService(server, TestApp.class);
+		// Will use RestClient
+		assertThat(service.discoveryClientOptionalArgs()).isInstanceOf(RestClientDiscoveryClientOptionalArgs.class);
+		LOG.info("Successfully asserted that RestClient will be used");
+		waitForRegistration(() -> new RestClientEurekaClientTests().createEurekaClient());
+	}
+
+	@AfterAll
+	public static void tearDownAll() {
+		stopService(service);
+		stopEurekaServer(server);
+	}
+
+	@Override
+	EurekaClientRunner createEurekaClient() {
+		return new EurekaClientRunner(TestApp.class, server);
+	}
+
+	@SpringBootConfiguration
+	@EnableAutoConfiguration
+	public static class TestApp {
+
+		// Want to force reusing exactly the same bean as on production without excluding
+		// jersey from the classpath
+		@Bean
+		public RestClientDiscoveryClientOptionalArgs forceRestClientDiscoveryClientOptionalArgs(
+				TlsProperties tlsProperties,
+				EurekaClientHttpRequestFactorySupplier eurekaClientHttpRequestFactorySupplier)
+				throws GeneralSecurityException, IOException {
+			RestClientDiscoveryClientOptionalArgs result = new RestClientDiscoveryClientOptionalArgs(
+					eurekaClientHttpRequestFactorySupplier, RestClient::builder);
+			setupTLS(result, tlsProperties);
+			return result;
+		}
+
+		@Bean
+		public RestClientTransportClientFactories forceRestClientTransportClientFactories(
+				RestClientDiscoveryClientOptionalArgs discoveryClientOptionalArgs) {
+			return new RestClientTransportClientFactories(discoveryClientOptionalArgs);
+		}
+
+	}
+
+	@SpringBootConfiguration
+	@EnableAutoConfiguration
+	@EnableEurekaServer
+	public static class TestEurekaServer {
+
+	}
+
+}

spring-cloud-netflix-eureka-client-tls-tests/src/test/java/org/springframework/cloud/netflix/eureka/RestTemplateEurekaClientTests.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2018-2022 the original author or authors.
+ * Copyright 2018-2024 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -26,18 +26,21 @@ import org.junit.jupiter.api.BeforeAll;
 
 import org.springframework.boot.SpringBootConfiguration;
 import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
+import org.springframework.boot.web.client.RestTemplateBuilder;
 import org.springframework.cloud.configuration.TlsProperties;
-import org.springframework.cloud.netflix.eureka.config.DiscoveryClientOptionalArgsConfiguration;
+import org.springframework.cloud.netflix.eureka.http.DefaultEurekaClientHttpRequestFactorySupplier;
 import org.springframework.cloud.netflix.eureka.http.EurekaClientHttpRequestFactorySupplier;
 import org.springframework.cloud.netflix.eureka.http.RestTemplateDiscoveryClientOptionalArgs;
+import org.springframework.cloud.netflix.eureka.http.RestTemplateTransportClientFactories;
 import org.springframework.cloud.netflix.eureka.server.EnableEurekaServer;
 import org.springframework.context.annotation.Bean;
 
 import static org.assertj.core.api.Assertions.assertThat;
+import static org.springframework.cloud.netflix.eureka.config.DiscoveryClientOptionalArgsConfiguration.setupTLS;
 
-public class RestTemplateEurekaClientTest extends BaseCertTest {
+public class RestTemplateEurekaClientTests extends BaseCertTests {
 
-	private static final Log log = LogFactory.getLog(RestTemplateEurekaClientTest.class);
+	private static final Log log = LogFactory.getLog(RestTemplateEurekaClientTests.class);
 
 	private static EurekaServerRunner server;
 
@@ -45,12 +48,12 @@ public class RestTemplateEurekaClientTest extends BaseCertTest {
 
 	@BeforeAll
 	public static void setupAll() {
-		server = startEurekaServer(RestTemplateEurekaClientTest.RestTemplateTestEurekaServer.class);
-		service = startService(server, RestTemplateEurekaClientTest.RestTemplateTestApp.class);
+		server = startEurekaServer(TestEurekaServer.class);
+		service = startService(server, RestTemplateEurekaClientTests.RestTemplateTestApp.class);
 		// Will use RestTemplate
 		assertThat(service.discoveryClientOptionalArgs()).isInstanceOf(RestTemplateDiscoveryClientOptionalArgs.class);
 		log.info("Successfully asserted that RestTemplate will be used");
-		waitForRegistration(() -> new RestTemplateEurekaClientTest().createEurekaClient());
+		waitForRegistration(() -> new RestTemplateEurekaClientTests().createEurekaClient());
 	}
 
 	@AfterAll
@@ -68,15 +71,27 @@ public class RestTemplateEurekaClientTest extends BaseCertTest {
 	@EnableAutoConfiguration
 	public static class RestTemplateTestApp {
 
-		// Want to force reusing exactly the same bean as on production without excluding
-		// jersey from the classpath
 		@Bean
 		public RestTemplateDiscoveryClientOptionalArgs forceRestTemplateDiscoveryClientOptionalArgs(
-				TlsProperties tlsProperties, DiscoveryClientOptionalArgsConfiguration configuration,
+				TlsProperties tlsProperties,
 				EurekaClientHttpRequestFactorySupplier eurekaClientHttpRequestFactorySupplier)
 				throws GeneralSecurityException, IOException {
-			return configuration.restTemplateDiscoveryClientOptionalArgs(tlsProperties,
-					eurekaClientHttpRequestFactorySupplier);
+			RestTemplateDiscoveryClientOptionalArgs result = new RestTemplateDiscoveryClientOptionalArgs(
+					eurekaClientHttpRequestFactorySupplier, RestTemplateBuilder::new);
+			setupTLS(result, tlsProperties);
+			return result;
+		}
+
+		@Bean
+		public RestTemplateTransportClientFactories forceRestTemplateTransportClientFactories(
+				RestTemplateDiscoveryClientOptionalArgs discoveryClientOptionalArgs) {
+			return new RestTemplateTransportClientFactories(discoveryClientOptionalArgs);
+		}
+
+		@Bean
+		EurekaClientHttpRequestFactorySupplier defaultEurekaClientHttpRequestFactorySupplier(
+				RestTemplateTimeoutProperties restTemplateTimeoutProperties) {
+			return new DefaultEurekaClientHttpRequestFactorySupplier(restTemplateTimeoutProperties);
 		}
 
 	}
@@ -84,7 +99,7 @@ public class RestTemplateEurekaClientTest extends BaseCertTest {
 	@SpringBootConfiguration
 	@EnableAutoConfiguration
 	@EnableEurekaServer
-	public static class RestTemplateTestEurekaServer {
+	public static class TestEurekaServer {
 
 	}
 

spring-cloud-netflix-eureka-client/pom.xml

@@ -6,7 +6,7 @@
 	<parent>
 		<groupId>org.springframework.cloud</groupId>
 		<artifactId>spring-cloud-netflix</artifactId>
-		<version>4.1.1-SNAPSHOT</version>
+		<version>4.2.2</version>
 		<relativePath>..</relativePath> <!-- lookup parent from repository -->
 	</parent>
 	<artifactId>spring-cloud-netflix-eureka-client</artifactId>

spring-cloud-netflix-eureka-client/src/main/java/org/springframework/cloud/netflix/eureka/CloudEurekaTransportConfig.java

@@ -193,20 +193,43 @@ public class CloudEurekaTransportConfig implements EurekaTransportConfig {
 	@Override
 	public String toString() {
 		return new StringBuilder("CloudEurekaTransportConfig{").append("sessionedClientReconnectIntervalSeconds=")
-				.append(sessionedClientReconnectIntervalSeconds).append(", ")
-				.append("retryableClientQuarantineRefreshPercentage=")
-				.append(retryableClientQuarantineRefreshPercentage).append(", ")
-				.append("bootstrapResolverRefreshIntervalSeconds=").append(bootstrapResolverRefreshIntervalSeconds)
-				.append(", ").append("applicationsResolverDataStalenessThresholdSeconds=")
-				.append(applicationsResolverDataStalenessThresholdSeconds).append(", ")
-				.append("asyncResolverRefreshIntervalMs=").append(asyncResolverRefreshIntervalMs).append(", ")
-				.append("asyncResolverWarmUpTimeoutMs=").append(asyncResolverWarmUpTimeoutMs).append(", ")
-				.append("asyncExecutorThreadPoolSize=").append(asyncExecutorThreadPoolSize).append(", ")
-				.append("readClusterVip='").append(readClusterVip).append("', ").append("writeClusterVip='")
-				.append(writeClusterVip).append("', ").append("bootstrapResolverForQuery=")
-				.append(bootstrapResolverForQuery).append(", ").append("bootstrapResolverStrategy='")
-				.append(bootstrapResolverStrategy).append("', ").append("applicationsResolverUseIp=")
-				.append(applicationsResolverUseIp).append(", ").append("}").toString();
+			.append(sessionedClientReconnectIntervalSeconds)
+			.append(", ")
+			.append("retryableClientQuarantineRefreshPercentage=")
+			.append(retryableClientQuarantineRefreshPercentage)
+			.append(", ")
+			.append("bootstrapResolverRefreshIntervalSeconds=")
+			.append(bootstrapResolverRefreshIntervalSeconds)
+			.append(", ")
+			.append("applicationsResolverDataStalenessThresholdSeconds=")
+			.append(applicationsResolverDataStalenessThresholdSeconds)
+			.append(", ")
+			.append("asyncResolverRefreshIntervalMs=")
+			.append(asyncResolverRefreshIntervalMs)
+			.append(", ")
+			.append("asyncResolverWarmUpTimeoutMs=")
+			.append(asyncResolverWarmUpTimeoutMs)
+			.append(", ")
+			.append("asyncExecutorThreadPoolSize=")
+			.append(asyncExecutorThreadPoolSize)
+			.append(", ")
+			.append("readClusterVip='")
+			.append(readClusterVip)
+			.append("', ")
+			.append("writeClusterVip='")
+			.append(writeClusterVip)
+			.append("', ")
+			.append("bootstrapResolverForQuery=")
+			.append(bootstrapResolverForQuery)
+			.append(", ")
+			.append("bootstrapResolverStrategy='")
+			.append(bootstrapResolverStrategy)
+			.append("', ")
+			.append("applicationsResolverUseIp=")
+			.append(applicationsResolverUseIp)
+			.append(", ")
+			.append("}")
+			.toString();
 	}
 
 }

spring-cloud-netflix-eureka-client/src/main/java/org/springframework/cloud/netflix/eureka/EurekaClientAutoConfiguration.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2013-2023 the original author or authors.
+ * Copyright 2013-2024 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -103,6 +103,7 @@ import static org.springframework.cloud.commons.util.IdUtils.getDefaultInstanceI
  * @author Daniel Lavoie
  * @author Olga Maciaszek-Sharma
  * @author Tim Ysewyn
+ * @author Robert Bleyl
  */
 @Configuration(proxyBeanMethods = false)
 @EnableConfigurationProperties
@@ -224,8 +225,8 @@ public class EurekaClientAutoConfiguration {
 	}
 
 	@Bean
-	public EurekaServiceRegistry eurekaServiceRegistry() {
-		return new EurekaServiceRegistry();
+	public EurekaServiceRegistry eurekaServiceRegistry(EurekaInstanceConfigBean eurekaInstanceConfigBean) {
+		return new EurekaServiceRegistry(eurekaInstanceConfigBean);
 	}
 
 	// @Bean
@@ -280,8 +281,11 @@ public class EurekaClientAutoConfiguration {
 		public EurekaRegistration eurekaRegistration(EurekaClient eurekaClient,
 				CloudEurekaInstanceConfig instanceConfig, ApplicationInfoManager applicationInfoManager,
 				@Autowired(required = false) ObjectProvider<HealthCheckHandler> healthCheckHandler) {
-			return EurekaRegistration.builder(instanceConfig).with(applicationInfoManager).with(eurekaClient)
-					.with(healthCheckHandler).build();
+			return EurekaRegistration.builder(instanceConfig)
+				.with(applicationInfoManager)
+				.with(eurekaClient)
+				.with(healthCheckHandler)
+				.build();
 		}
 
 	}
@@ -339,8 +343,11 @@ public class EurekaClientAutoConfiguration {
 		public EurekaRegistration eurekaRegistration(EurekaClient eurekaClient,
 				CloudEurekaInstanceConfig instanceConfig, ApplicationInfoManager applicationInfoManager,
 				@Autowired(required = false) ObjectProvider<HealthCheckHandler> healthCheckHandler) {
-			return EurekaRegistration.builder(instanceConfig).with(applicationInfoManager).with(eurekaClient)
-					.with(healthCheckHandler).build();
+			return EurekaRegistration.builder(instanceConfig)
+				.with(applicationInfoManager)
+				.with(eurekaClient)
+				.with(healthCheckHandler)
+				.build();
 		}
 
 	}
@@ -410,75 +417,30 @@ class EurekaClientHints implements RuntimeHintsRegistrar {
 		if (!ClassUtils.isPresent("com.netflix.discovery.DiscoveryClient", classLoader)) {
 			return;
 		}
-		hints.reflection().registerType(TypeReference.of(DiscoveryClient.class),
-				hint -> hint.withMembers(MemberCategory.DECLARED_FIELDS, MemberCategory.INTROSPECT_DECLARED_METHODS))
-				.registerType(TypeReference.of(EurekaEndpoint.class),
-						hint -> hint.withMembers(MemberCategory.INVOKE_DECLARED_METHODS))
-				.registerType(TypeReference.of(DefaultEndpoint.class),
-						hint -> hint.withMembers(MemberCategory.DECLARED_FIELDS, MemberCategory.INVOKE_DECLARED_METHODS,
-								MemberCategory.INVOKE_DECLARED_CONSTRUCTORS))
-				.registerType(TypeReference.of(EurekaHttpClientDecorator.class),
-						hint -> hint.withMembers(MemberCategory.DECLARED_FIELDS,
-								MemberCategory.INTROSPECT_DECLARED_METHODS))
-				.registerType(TypeReference.of(EurekaHttpResponse.class),
-						hint -> hint.withMembers(MemberCategory.DECLARED_FIELDS, MemberCategory.INVOKE_DECLARED_METHODS,
-								MemberCategory.INVOKE_DECLARED_CONSTRUCTORS))
-				.registerType(TypeReference.of(EurekaHttpClientDecorator.RequestExecutor.class),
-						hint -> hint.withMembers(MemberCategory.INVOKE_DECLARED_METHODS))
-				.registerType(TypeReference.of(ApplicationInfoManager.class),
-						hint -> hint.withMembers(MemberCategory.INTROSPECT_DECLARED_METHODS))
-				.registerType(TypeReference.of(InstanceInfo.class),
-						hint -> hint.withMembers(MemberCategory.INVOKE_DECLARED_METHODS, MemberCategory.DECLARED_FIELDS,
-								MemberCategory.INVOKE_DECLARED_CONSTRUCTORS))
-				.registerType(TypeReference.of(InstanceInfo.ActionType.class),
-						hint -> hint.withMembers(MemberCategory.INTROSPECT_DECLARED_METHODS,
-								MemberCategory.DECLARED_FIELDS))
-				.registerType(TypeReference.of(InstanceInfo.PortWrapper.class),
-						hint -> hint.withMembers(MemberCategory.INVOKE_DECLARED_METHODS,
-								MemberCategory.INVOKE_DECLARED_CONSTRUCTORS, MemberCategory.DECLARED_FIELDS))
-				.registerType(TypeReference.of(LeaseInfo.class),
-						hint -> hint.withMembers(MemberCategory.INVOKE_DECLARED_METHODS,
-								MemberCategory.INVOKE_DECLARED_CONSTRUCTORS, MemberCategory.DECLARED_FIELDS))
-				.registerType(TypeReference.of(MyDataCenterInfo.class),
-						hint -> hint.withMembers(MemberCategory.INVOKE_DECLARED_METHODS,
-								MemberCategory.INVOKE_DECLARED_CONSTRUCTORS, MemberCategory.DECLARED_FIELDS))
-				.registerType(TypeReference.of(DataCenterInfo.class),
-						hint -> hint.withMembers(MemberCategory.INVOKE_DECLARED_METHODS,
-								MemberCategory.INVOKE_DECLARED_CONSTRUCTORS, MemberCategory.DECLARED_FIELDS))
-				.registerType(TypeReference.of(DataCenterInfo.Name.class),
-						hint -> hint.withMembers(MemberCategory.INVOKE_DECLARED_METHODS,
-								MemberCategory.INVOKE_DECLARED_CONSTRUCTORS, MemberCategory.DECLARED_FIELDS))
-				.registerType(TypeReference.of(EurekaClient.class),
-						hint -> hint.withMembers(MemberCategory.INVOKE_PUBLIC_METHODS))
-				.registerType(TypeReference.of(TimedSupervisorTask.class),
-						hint -> hint.withMembers(MemberCategory.INTROSPECT_DECLARED_METHODS,
-								MemberCategory.DECLARED_FIELDS))
-				.registerType(TypeReference.of(DataCenterTypeInfoResolver.class),
-						hint -> hint.withMembers(MemberCategory.INVOKE_PUBLIC_CONSTRUCTORS))
-				.registerType(TypeReference.of(ApplicationsJacksonBuilder.class),
-						hint -> hint.withMembers(MemberCategory.INVOKE_DECLARED_METHODS,
-								MemberCategory.INVOKE_DECLARED_CONSTRUCTORS, MemberCategory.DECLARED_FIELDS))
-				.registerType(TypeReference.of(InstanceInfoJsonMixIn.class),
-						hint -> hint.withMembers(MemberCategory.INTROSPECT_DECLARED_METHODS,
-								MemberCategory.DECLARED_FIELDS))
-				.registerType(TypeReference.of(Application.class),
-						hint -> hint.withMembers(MemberCategory.INTROSPECT_DECLARED_METHODS,
-								MemberCategory.INVOKE_PUBLIC_CONSTRUCTORS, MemberCategory.DECLARED_FIELDS))
-				.registerType(TypeReference.of(Applications.class),
-						hint -> hint.withMembers(MemberCategory.INTROSPECT_DECLARED_METHODS,
-								MemberCategory.DECLARED_FIELDS))
-				.registerType(TypeReference.of(AsyncResolver.class),
-						hint -> hint.withMembers(MemberCategory.INTROSPECT_DECLARED_METHODS,
-								MemberCategory.DECLARED_FIELDS))
-				.registerType(TypeReference.of(RetryableEurekaHttpClient.class),
-						hint -> hint.withMembers(MemberCategory.INTROSPECT_DECLARED_METHODS,
-								MemberCategory.DECLARED_FIELDS))
-				.registerType(TypeReference.of(SessionedEurekaHttpClient.class),
-						hint -> hint.withMembers(MemberCategory.INTROSPECT_DECLARED_METHODS,
-								MemberCategory.DECLARED_FIELDS))
-				.registerType(TypeReference.of(EurekaServiceInstance.class),
-						hint -> hint.withMembers(MemberCategory.INVOKE_DECLARED_METHODS,
-								MemberCategory.INVOKE_DECLARED_CONSTRUCTORS, MemberCategory.DECLARED_FIELDS));
+		hints.reflection()
+			.registerTypes(TypeReference.listOf(ApplicationInfoManager.class),
+					hint -> hint.withMembers(MemberCategory.INTROSPECT_DECLARED_METHODS))
+			.registerTypes(
+					TypeReference.listOf(DiscoveryClient.class, EurekaHttpClientDecorator.class,
+							InstanceInfo.ActionType.class, InstanceInfoJsonMixIn.class, SessionedEurekaHttpClient.class,
+							RetryableEurekaHttpClient.class, AsyncResolver.class, Applications.class,
+							TimedSupervisorTask.class),
+					hint -> hint.withMembers(MemberCategory.DECLARED_FIELDS,
+							MemberCategory.INTROSPECT_DECLARED_METHODS))
+			.registerTypes(
+					TypeReference.listOf(EurekaEndpoint.class, EurekaHttpClientDecorator.RequestExecutor.class,
+							EurekaClient.class, DiscoveryClient.class),
+					hint -> hint.withMembers(MemberCategory.INVOKE_DECLARED_METHODS))
+			.registerTypes(TypeReference.listOf(DataCenterTypeInfoResolver.class),
+					hint -> hint.withMembers(MemberCategory.INVOKE_PUBLIC_CONSTRUCTORS))
+			.registerTypes(TypeReference.listOf(Application.class),
+					hint -> hint.withMembers(MemberCategory.DECLARED_FIELDS, MemberCategory.INTROSPECT_DECLARED_METHODS,
+							MemberCategory.INVOKE_PUBLIC_CONSTRUCTORS))
+			.registerTypes(TypeReference.listOf(DefaultEndpoint.class, EurekaHttpResponse.class, InstanceInfo.class,
+					InstanceInfo.PortWrapper.class, LeaseInfo.class, MyDataCenterInfo.class, DataCenterInfo.class,
+					DataCenterInfo.Name.class, ApplicationsJacksonBuilder.class, EurekaServiceInstance.class),
+					hint -> hint.withMembers(MemberCategory.DECLARED_FIELDS, MemberCategory.INVOKE_DECLARED_METHODS,
+							MemberCategory.INVOKE_DECLARED_CONSTRUCTORS));
 	}
 
 }

spring-cloud-netflix-eureka-client/src/main/java/org/springframework/cloud/netflix/eureka/EurekaClientConfigBean.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2013-2022 the original author or authors.
+ * Copyright 2013-2024 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -41,6 +41,7 @@ import static org.springframework.cloud.netflix.eureka.EurekaConstants.DEFAULT_P
  *
  * @author Dave Syer
  * @author Gregor Zurowski
+ * @author Mooyong Lee
  */
 @ConfigurationProperties(EurekaClientConfigBean.PREFIX)
 public class EurekaClientConfigBean implements EurekaClientConfig, Ordered {
@@ -60,8 +61,6 @@ public class EurekaClientConfigBean implements EurekaClientConfig, Ordered {
 	 */
 	public static final String DEFAULT_ZONE = "defaultZone";
 
-	private static final int MINUTES = 60;
-
 	@Autowired(required = false)
 	PropertyResolver propertyResolver;
 
@@ -96,7 +95,7 @@ public class EurekaClientConfigBean implements EurekaClientConfig, Ordered {
 	 * Eureka servers could be added or removed and this setting controls how soon the
 	 * eureka clients should know about it.
 	 */
-	private int eurekaServiceUrlPollIntervalSeconds = 5 * MINUTES;
+	private int eurekaServiceUrlPollIntervalSeconds = 300; // 5 * MINUTES
 
 	/**
 	 * Gets the proxy port to eureka server if any.
@@ -998,47 +997,147 @@ public class EurekaClientConfigBean implements EurekaClientConfig, Ordered {
 
 	@Override
 	public String toString() {
-		return new StringBuilder("EurekaClientConfigBean{").append("propertyResolver=").append(propertyResolver)
-				.append(", ").append("enabled=").append(enabled).append(", ").append("transport=").append(transport)
-				.append(", ").append("registryFetchIntervalSeconds=").append(registryFetchIntervalSeconds).append(", ")
-				.append("instanceInfoReplicationIntervalSeconds=").append(instanceInfoReplicationIntervalSeconds)
-				.append(", ").append("initialInstanceInfoReplicationIntervalSeconds=")
-				.append(initialInstanceInfoReplicationIntervalSeconds).append(", ")
-				.append("eurekaServiceUrlPollIntervalSeconds=").append(eurekaServiceUrlPollIntervalSeconds).append(", ")
-				.append("proxyPort='").append(proxyPort).append("', ").append("proxyHost='").append(proxyHost)
-				.append("', ").append("proxyUserName='").append(proxyUserName).append("', ").append("proxyPassword='")
-				.append(proxyPassword).append("', ").append("eurekaServerReadTimeoutSeconds=")
-				.append(eurekaServerReadTimeoutSeconds).append(", ").append("eurekaServerConnectTimeoutSeconds=")
-				.append(eurekaServerConnectTimeoutSeconds).append(", ").append("backupRegistryImpl='")
-				.append(backupRegistryImpl).append("', ").append("eurekaServerTotalConnections=")
-				.append(eurekaServerTotalConnections).append(", ").append("eurekaServerTotalConnectionsPerHost=")
-				.append(eurekaServerTotalConnectionsPerHost).append(", ").append("eurekaServerURLContext='")
-				.append(eurekaServerURLContext).append("', ").append("eurekaServerPort='").append(eurekaServerPort)
-				.append("', ").append("eurekaServerDNSName='").append(eurekaServerDNSName).append("', ")
-				.append("region='").append(region).append("', ").append("eurekaConnectionIdleTimeoutSeconds=")
-				.append(eurekaConnectionIdleTimeoutSeconds).append(", ").append("registryRefreshSingleVipAddress='")
-				.append(registryRefreshSingleVipAddress).append("', ").append("heartbeatExecutorThreadPoolSize=")
-				.append(heartbeatExecutorThreadPoolSize).append(", ")
-				.append("heartbeatExecutorExponentialBackOffBound=").append(heartbeatExecutorExponentialBackOffBound)
-				.append(", ").append("cacheRefreshExecutorThreadPoolSize=").append(cacheRefreshExecutorThreadPoolSize)
-				.append(", ").append("cacheRefreshExecutorExponentialBackOffBound=")
-				.append(cacheRefreshExecutorExponentialBackOffBound).append(", ").append("serviceUrl=")
-				.append(serviceUrl).append(", ").append("gZipContent=").append(gZipContent).append(", ")
-				.append("useDnsForFetchingServiceUrls=").append(useDnsForFetchingServiceUrls).append(", ")
-				.append("registerWithEureka=").append(registerWithEureka).append(", ").append("preferSameZoneEureka=")
-				.append(preferSameZoneEureka).append(", ").append("logDeltaDiff=").append(logDeltaDiff).append(", ")
-				.append("disableDelta=").append(disableDelta).append(", ").append("fetchRemoteRegionsRegistry='")
-				.append(fetchRemoteRegionsRegistry).append("', ").append("availabilityZones=").append(availabilityZones)
-				.append(", ").append("filterOnlyUpInstances=").append(filterOnlyUpInstances).append(", ")
-				.append("fetchRegistry=").append(fetchRegistry).append(", ").append("dollarReplacement='")
-				.append(dollarReplacement).append("', ").append("escapeCharReplacement='").append(escapeCharReplacement)
-				.append("', ").append("allowRedirects=").append(allowRedirects).append(", ")
-				.append("onDemandUpdateStatusChange=").append(onDemandUpdateStatusChange).append(", ")
-				.append("encoderName='").append(encoderName).append("', ").append("decoderName='").append(decoderName)
-				.append("', ").append("clientDataAccept='").append(clientDataAccept).append("', ")
-				.append("shouldUnregisterOnShutdown='").append(shouldUnregisterOnShutdown)
-				.append("shouldEnforceRegistrationAtInit='").append(shouldEnforceRegistrationAtInit).append("', ")
-				.append("order='").append(order).append("'}").toString();
+		return new StringBuilder("EurekaClientConfigBean{").append("propertyResolver=")
+			.append(propertyResolver)
+			.append(", ")
+			.append("enabled=")
+			.append(enabled)
+			.append(", ")
+			.append("transport=")
+			.append(transport)
+			.append(", ")
+			.append("registryFetchIntervalSeconds=")
+			.append(registryFetchIntervalSeconds)
+			.append(", ")
+			.append("instanceInfoReplicationIntervalSeconds=")
+			.append(instanceInfoReplicationIntervalSeconds)
+			.append(", ")
+			.append("initialInstanceInfoReplicationIntervalSeconds=")
+			.append(initialInstanceInfoReplicationIntervalSeconds)
+			.append(", ")
+			.append("eurekaServiceUrlPollIntervalSeconds=")
+			.append(eurekaServiceUrlPollIntervalSeconds)
+			.append(", ")
+			.append("proxyPort='")
+			.append(proxyPort)
+			.append("', ")
+			.append("proxyHost='")
+			.append(proxyHost)
+			.append("', ")
+			.append("proxyUserName='")
+			.append(proxyUserName)
+			.append("', ")
+			.append("proxyPassword='")
+			.append(proxyPassword)
+			.append("', ")
+			.append("eurekaServerReadTimeoutSeconds=")
+			.append(eurekaServerReadTimeoutSeconds)
+			.append(", ")
+			.append("eurekaServerConnectTimeoutSeconds=")
+			.append(eurekaServerConnectTimeoutSeconds)
+			.append(", ")
+			.append("backupRegistryImpl='")
+			.append(backupRegistryImpl)
+			.append("', ")
+			.append("eurekaServerTotalConnections=")
+			.append(eurekaServerTotalConnections)
+			.append(", ")
+			.append("eurekaServerTotalConnectionsPerHost=")
+			.append(eurekaServerTotalConnectionsPerHost)
+			.append(", ")
+			.append("eurekaServerURLContext='")
+			.append(eurekaServerURLContext)
+			.append("', ")
+			.append("eurekaServerPort='")
+			.append(eurekaServerPort)
+			.append("', ")
+			.append("eurekaServerDNSName='")
+			.append(eurekaServerDNSName)
+			.append("', ")
+			.append("region='")
+			.append(region)
+			.append("', ")
+			.append("eurekaConnectionIdleTimeoutSeconds=")
+			.append(eurekaConnectionIdleTimeoutSeconds)
+			.append(", ")
+			.append("registryRefreshSingleVipAddress='")
+			.append(registryRefreshSingleVipAddress)
+			.append("', ")
+			.append("heartbeatExecutorThreadPoolSize=")
+			.append(heartbeatExecutorThreadPoolSize)
+			.append(", ")
+			.append("heartbeatExecutorExponentialBackOffBound=")
+			.append(heartbeatExecutorExponentialBackOffBound)
+			.append(", ")
+			.append("cacheRefreshExecutorThreadPoolSize=")
+			.append(cacheRefreshExecutorThreadPoolSize)
+			.append(", ")
+			.append("cacheRefreshExecutorExponentialBackOffBound=")
+			.append(cacheRefreshExecutorExponentialBackOffBound)
+			.append(", ")
+			.append("serviceUrl=")
+			.append(serviceUrl)
+			.append(", ")
+			.append("gZipContent=")
+			.append(gZipContent)
+			.append(", ")
+			.append("useDnsForFetchingServiceUrls=")
+			.append(useDnsForFetchingServiceUrls)
+			.append(", ")
+			.append("registerWithEureka=")
+			.append(registerWithEureka)
+			.append(", ")
+			.append("preferSameZoneEureka=")
+			.append(preferSameZoneEureka)
+			.append(", ")
+			.append("logDeltaDiff=")
+			.append(logDeltaDiff)
+			.append(", ")
+			.append("disableDelta=")
+			.append(disableDelta)
+			.append(", ")
+			.append("fetchRemoteRegionsRegistry='")
+			.append(fetchRemoteRegionsRegistry)
+			.append("', ")
+			.append("availabilityZones=")
+			.append(availabilityZones)
+			.append(", ")
+			.append("filterOnlyUpInstances=")
+			.append(filterOnlyUpInstances)
+			.append(", ")
+			.append("fetchRegistry=")
+			.append(fetchRegistry)
+			.append(", ")
+			.append("dollarReplacement='")
+			.append(dollarReplacement)
+			.append("', ")
+			.append("escapeCharReplacement='")
+			.append(escapeCharReplacement)
+			.append("', ")
+			.append("allowRedirects=")
+			.append(allowRedirects)
+			.append(", ")
+			.append("onDemandUpdateStatusChange=")
+			.append(onDemandUpdateStatusChange)
+			.append(", ")
+			.append("encoderName='")
+			.append(encoderName)
+			.append("', ")
+			.append("decoderName='")
+			.append(decoderName)
+			.append("', ")
+			.append("clientDataAccept='")
+			.append(clientDataAccept)
+			.append("', ")
+			.append("shouldUnregisterOnShutdown='")
+			.append(shouldUnregisterOnShutdown)
+			.append("shouldEnforceRegistrationAtInit='")
+			.append(shouldEnforceRegistrationAtInit)
+			.append("', ")
+			.append("order='")
+			.append(order)
+			.append("'}")
+			.toString();
 	}
 
 }

spring-cloud-netflix-eureka-client/src/main/java/org/springframework/cloud/netflix/eureka/EurekaDiscoveryClient.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2013-2022 the original author or authors.
+ * Copyright 2013-2024 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -19,6 +19,7 @@ package org.springframework.cloud.netflix.eureka;
 import java.util.ArrayList;
 import java.util.Collections;
 import java.util.List;
+import java.util.Locale;
 
 import com.netflix.appinfo.InstanceInfo;
 import com.netflix.discovery.EurekaClient;
@@ -35,6 +36,7 @@ import org.springframework.core.Ordered;
  *
  * @author Spencer Gibb
  * @author Tim Ysewyn
+ * @author Olga Maciaszek-Sharma
  */
 public class EurekaDiscoveryClient implements DiscoveryClient {
 
@@ -79,7 +81,7 @@ public class EurekaDiscoveryClient implements DiscoveryClient {
 			if (app.getInstances().isEmpty()) {
 				continue;
 			}
-			names.add(app.getName().toLowerCase());
+			names.add(app.getName().toLowerCase(Locale.ROOT));
 
 		}
 		return names;

spring-cloud-netflix-eureka-client/src/main/java/org/springframework/cloud/netflix/eureka/EurekaInstanceConfigBean.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2013-2022 the original author or authors.
+ * Copyright 2013-2024 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -38,6 +38,7 @@ import org.springframework.util.StringUtils;
  * @author Spencer Gibb
  * @author Ryan Baxter
  * @author Gregor Zurowski
+ * @author Robert Bleyl
  */
 @ConfigurationProperties("eureka.instance")
 public class EurekaInstanceConfigBean implements CloudEurekaInstanceConfig, EnvironmentAware {
@@ -269,6 +270,12 @@ public class EurekaInstanceConfigBean implements CloudEurekaInstanceConfig, Envi
 	 */
 	private boolean preferIpAddress = false;
 
+	/**
+	 * If true the EurekaClient will be initialized asynchronously when the
+	 * InstanceRegistry bean is created.
+	 */
+	private boolean asyncClientInitialization;
+
 	/**
 	 * Initial status to register with remote Eureka server.
 	 */
@@ -547,6 +554,14 @@ public class EurekaInstanceConfigBean implements CloudEurekaInstanceConfig, Envi
 		this.preferIpAddress = preferIpAddress;
 	}
 
+	public boolean isAsyncClientInitialization() {
+		return asyncClientInitialization;
+	}
+
+	public void setAsyncClientInitialization(boolean asyncClientInitialization) {
+		this.asyncClientInitialization = asyncClientInitialization;
+	}
+
 	public InstanceStatus getInitialStatus() {
 		return initialStatus;
 	}
@@ -597,6 +612,7 @@ public class EurekaInstanceConfigBean implements CloudEurekaInstanceConfig, Envi
 				&& Objects.equals(namespace, that.namespace) && Objects.equals(hostname, that.hostname)
 				&& preferIpAddress == that.preferIpAddress && Objects.equals(initialStatus, that.initialStatus)
 				&& Arrays.equals(defaultAddressResolutionOrder, that.defaultAddressResolutionOrder)
+				&& asyncClientInitialization == that.asyncClientInitialization
 				&& Objects.equals(environment, that.environment);
 	}
 
@@ -607,34 +623,109 @@ public class EurekaInstanceConfigBean implements CloudEurekaInstanceConfig, Envi
 				leaseExpirationDurationInSeconds, virtualHostName, instanceId, secureVirtualHostName, aSGName,
 				metadataMap, dataCenterInfo, ipAddress, statusPageUrlPath, statusPageUrl, homePageUrlPath, homePageUrl,
 				healthCheckUrlPath, healthCheckUrl, secureHealthCheckUrl, namespace, hostname, preferIpAddress,
-				initialStatus, Arrays.hashCode(defaultAddressResolutionOrder), environment);
+				asyncClientInitialization, initialStatus, Arrays.hashCode(defaultAddressResolutionOrder), environment);
 	}
 
 	@Override
 	public String toString() {
-		return new StringBuilder("EurekaInstanceConfigBean{").append("hostInfo=").append(hostInfo).append(", ")
-				.append("inetUtils=").append(inetUtils).append(", ").append("appname='").append(appname).append("', ")
-				.append("appGroupName='").append(appGroupName).append("', ").append("instanceEnabledOnit=")
-				.append(instanceEnabledOnit).append(", ").append("nonSecurePort=").append(nonSecurePort).append(", ")
-				.append("securePort=").append(securePort).append(", ").append("nonSecurePortEnabled=")
-				.append(nonSecurePortEnabled).append(", ").append("securePortEnabled=").append(securePortEnabled)
-				.append(", ").append("leaseRenewalIntervalInSeconds=").append(leaseRenewalIntervalInSeconds)
-				.append(", ").append("leaseExpirationDurationInSeconds=").append(leaseExpirationDurationInSeconds)
-				.append(", ").append("virtualHostName='").append(virtualHostName).append("', ").append("instanceId='")
-				.append(instanceId).append("', ").append("secureVirtualHostName='").append(secureVirtualHostName)
-				.append("', ").append("aSGName='").append(aSGName).append("', ").append("metadataMap=")
-				.append(metadataMap).append(", ").append("dataCenterInfo=").append(dataCenterInfo).append(", ")
-				.append("ipAddress='").append(ipAddress).append("', ").append("statusPageUrlPath='")
-				.append(statusPageUrlPath).append("', ").append("statusPageUrl='").append(statusPageUrl).append("', ")
-				.append("homePageUrlPath='").append(homePageUrlPath).append("', ").append("homePageUrl='")
-				.append(homePageUrl).append("', ").append("healthCheckUrlPath='").append(healthCheckUrlPath)
-				.append("', ").append("healthCheckUrl='").append(healthCheckUrl).append("', ")
-				.append("secureHealthCheckUrl='").append(secureHealthCheckUrl).append("', ").append("namespace='")
-				.append(namespace).append("', ").append("hostname='").append(hostname).append("', ")
-				.append("preferIpAddress=").append(preferIpAddress).append(", ").append("initialStatus=")
-				.append(initialStatus).append(", ").append("defaultAddressResolutionOrder=")
-				.append(Arrays.toString(defaultAddressResolutionOrder)).append(", ").append("environment=")
-				.append(environment).append(", ").append("}").toString();
+		return new StringBuilder("EurekaInstanceConfigBean{").append("hostInfo=")
+			.append(hostInfo)
+			.append(", ")
+			.append("inetUtils=")
+			.append(inetUtils)
+			.append(", ")
+			.append("appname='")
+			.append(appname)
+			.append("', ")
+			.append("appGroupName='")
+			.append(appGroupName)
+			.append("', ")
+			.append("instanceEnabledOnit=")
+			.append(instanceEnabledOnit)
+			.append(", ")
+			.append("nonSecurePort=")
+			.append(nonSecurePort)
+			.append(", ")
+			.append("securePort=")
+			.append(securePort)
+			.append(", ")
+			.append("nonSecurePortEnabled=")
+			.append(nonSecurePortEnabled)
+			.append(", ")
+			.append("securePortEnabled=")
+			.append(securePortEnabled)
+			.append(", ")
+			.append("leaseRenewalIntervalInSeconds=")
+			.append(leaseRenewalIntervalInSeconds)
+			.append(", ")
+			.append("leaseExpirationDurationInSeconds=")
+			.append(leaseExpirationDurationInSeconds)
+			.append(", ")
+			.append("virtualHostName='")
+			.append(virtualHostName)
+			.append("', ")
+			.append("instanceId='")
+			.append(instanceId)
+			.append("', ")
+			.append("secureVirtualHostName='")
+			.append(secureVirtualHostName)
+			.append("', ")
+			.append("aSGName='")
+			.append(aSGName)
+			.append("', ")
+			.append("metadataMap=")
+			.append(metadataMap)
+			.append(", ")
+			.append("dataCenterInfo=")
+			.append(dataCenterInfo)
+			.append(", ")
+			.append("ipAddress='")
+			.append(ipAddress)
+			.append("', ")
+			.append("statusPageUrlPath='")
+			.append(statusPageUrlPath)
+			.append("', ")
+			.append("statusPageUrl='")
+			.append(statusPageUrl)
+			.append("', ")
+			.append("homePageUrlPath='")
+			.append(homePageUrlPath)
+			.append("', ")
+			.append("homePageUrl='")
+			.append(homePageUrl)
+			.append("', ")
+			.append("healthCheckUrlPath='")
+			.append(healthCheckUrlPath)
+			.append("', ")
+			.append("healthCheckUrl='")
+			.append(healthCheckUrl)
+			.append("', ")
+			.append("secureHealthCheckUrl='")
+			.append(secureHealthCheckUrl)
+			.append("', ")
+			.append("namespace='")
+			.append(namespace)
+			.append("', ")
+			.append("hostname='")
+			.append(hostname)
+			.append("', ")
+			.append("asyncClientInitialization=")
+			.append(asyncClientInitialization)
+			.append(", ")
+			.append("preferIpAddress=")
+			.append(preferIpAddress)
+			.append(", ")
+			.append("initialStatus=")
+			.append(initialStatus)
+			.append(", ")
+			.append("defaultAddressResolutionOrder=")
+			.append(Arrays.toString(defaultAddressResolutionOrder))
+			.append(", ")
+			.append("environment=")
+			.append(environment)
+			.append(", ")
+			.append("}")
+			.toString();
 	}
 
 }

spring-cloud-netflix-eureka-client/src/main/java/org/springframework/cloud/netflix/eureka/InstanceInfoFactory.java

@@ -35,8 +35,8 @@ public class InstanceInfoFactory {
 
 	public InstanceInfo create(EurekaInstanceConfig config) {
 		LeaseInfo.Builder leaseInfoBuilder = LeaseInfo.Builder.newBuilder()
-				.setRenewalIntervalInSecs(config.getLeaseRenewalIntervalInSeconds())
-				.setDurationInSecs(config.getLeaseExpirationDurationInSeconds());
+			.setRenewalIntervalInSecs(config.getLeaseRenewalIntervalInSeconds())
+			.setDurationInSecs(config.getLeaseExpirationDurationInSeconds());
 
 		// Builder the instance information to be registered with eureka
 		// server
@@ -46,19 +46,24 @@ public class InstanceInfoFactory {
 		if (!namespace.endsWith(".")) {
 			namespace = namespace + ".";
 		}
-		builder.setNamespace(namespace).setAppName(config.getAppname()).setInstanceId(config.getInstanceId())
-				.setAppGroupName(config.getAppGroupName()).setDataCenterInfo(config.getDataCenterInfo())
-				.setIPAddr(config.getIpAddress()).setHostName(config.getHostName(false))
-				.setPort(config.getNonSecurePort())
-				.enablePort(InstanceInfo.PortType.UNSECURE, config.isNonSecurePortEnabled())
-				.setSecurePort(config.getSecurePort())
-				.enablePort(InstanceInfo.PortType.SECURE, config.getSecurePortEnabled())
-				.setVIPAddress(config.getVirtualHostName()).setSecureVIPAddress(config.getSecureVirtualHostName())
-				.setHomePageUrl(config.getHomePageUrlPath(), config.getHomePageUrl())
-				.setStatusPageUrl(config.getStatusPageUrlPath(), config.getStatusPageUrl())
-				.setHealthCheckUrls(config.getHealthCheckUrlPath(), config.getHealthCheckUrl(),
-						config.getSecureHealthCheckUrl())
-				.setASGName(config.getASGName());
+		builder.setNamespace(namespace)
+			.setAppName(config.getAppname())
+			.setInstanceId(config.getInstanceId())
+			.setAppGroupName(config.getAppGroupName())
+			.setDataCenterInfo(config.getDataCenterInfo())
+			.setIPAddr(config.getIpAddress())
+			.setHostName(config.getHostName(false))
+			.setPort(config.getNonSecurePort())
+			.enablePort(InstanceInfo.PortType.UNSECURE, config.isNonSecurePortEnabled())
+			.setSecurePort(config.getSecurePort())
+			.enablePort(InstanceInfo.PortType.SECURE, config.getSecurePortEnabled())
+			.setVIPAddress(config.getVirtualHostName())
+			.setSecureVIPAddress(config.getSecureVirtualHostName())
+			.setHomePageUrl(config.getHomePageUrlPath(), config.getHomePageUrl())
+			.setStatusPageUrl(config.getStatusPageUrlPath(), config.getStatusPageUrl())
+			.setHealthCheckUrls(config.getHealthCheckUrlPath(), config.getHealthCheckUrl(),
+					config.getSecureHealthCheckUrl())
+			.setASGName(config.getASGName());
 
 		// Start off with the STARTING state to avoid traffic
 		if (!config.isInstanceEnabledOnit()) {

spring-cloud-netflix-eureka-client/src/main/java/org/springframework/cloud/netflix/eureka/RestClientTimeoutProperties.java

@@ -0,0 +1,37 @@
+/*
+ * Copyright 2013-2024 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.cloud.netflix.eureka;
+
+import org.springframework.boot.context.properties.ConfigurationProperties;
+import org.springframework.web.client.RestClient;
+
+/**
+ * A {@link RestClient}-specific {@link TimeoutProperties} implementation.
+ *
+ * @author Olga Maciaszek-Sharma
+ * @since 4.2.0
+ */
+@ConfigurationProperties("eureka.client.restclient.timeout")
+public class RestClientTimeoutProperties extends TimeoutProperties {
+
+	@Override
+	public String toString() {
+		return "RestClientTimeoutProperties{" + ", connectTimeout=" + connectTimeout + ", connectRequestTimeout="
+				+ connectRequestTimeout + ", socketTimeout=" + socketTimeout + '}';
+	}
+
+}

spring-cloud-netflix-eureka-client/src/main/java/org/springframework/cloud/netflix/eureka/RestTemplateTimeoutProperties.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2013-2022 the original author or authors.
+ * Copyright 2013-2024 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -16,78 +16,23 @@
 
 package org.springframework.cloud.netflix.eureka;
 
-import java.util.Objects;
-
-import org.apache.hc.client5.http.config.RequestConfig;
-import org.apache.hc.core5.http.io.SocketConfig;
-
 import org.springframework.boot.context.properties.ConfigurationProperties;
-import org.springframework.cloud.netflix.eureka.http.RestTemplateEurekaHttpClient;
+import org.springframework.web.client.RestClient;
 import org.springframework.web.client.RestTemplate;
 
 /**
- * Properties for configuring timeouts used in {@link RestTemplate} required by
- * {@link RestTemplateEurekaHttpClient}.
+ * A {@link RestTemplate}-specific {@link TimeoutProperties} implementation.
  *
  * @author Jiwon Jeon
+ * @author Mooyong Lee
+ * @author Olga Maciaszek-Sharma
  * @since 3.1.6
+ * @deprecated {@link RestTemplate}-based implementation to be removed in favour of
+ * {@link RestClient}-based implementation.
  */
+@Deprecated(forRemoval = true)
 @ConfigurationProperties("eureka.client.rest-template-timeout")
-public class RestTemplateTimeoutProperties {
-
-	/**
-	 * Default values are set to 180000, in keeping with {@link RequestConfig} and
-	 * {@link SocketConfig} defaults.
-	 */
-	private int connectTimeout = 3 * 60 * 1000;
-
-	private int connectRequestTimeout = 3 * 60 * 1000;
-
-	private int socketTimeout = 3 * 60 * 1000;
-
-	public int getConnectTimeout() {
-		return connectTimeout;
-	}
-
-	public int getConnectRequestTimeout() {
-		return connectRequestTimeout;
-	}
-
-	public int getSocketTimeout() {
-		return socketTimeout;
-	}
-
-	public void setConnectTimeout(int connectTimeout) {
-		this.connectTimeout = connectTimeout;
-	}
-
-	public void setConnectRequestTimeout(int connectRequestTimeout) {
-		this.connectRequestTimeout = connectRequestTimeout;
-	}
-
-	public void setSocketTimeout(int socketTimeout) {
-		this.socketTimeout = socketTimeout;
-	}
-
-	@Override
-	public boolean equals(Object o) {
-		if (this == o) {
-			return true;
-		}
-		if (o == null || getClass() != o.getClass()) {
-			return false;
-		}
-
-		RestTemplateTimeoutProperties that = (RestTemplateTimeoutProperties) o;
-
-		return connectTimeout == that.connectTimeout && connectRequestTimeout == that.connectRequestTimeout
-				&& socketTimeout == that.socketTimeout;
-	}
-
-	@Override
-	public int hashCode() {
-		return Objects.hash(connectTimeout, connectRequestTimeout, socketTimeout);
-	}
+public class RestTemplateTimeoutProperties extends TimeoutProperties {
 
 	@Override
 	public String toString() {

spring-cloud-netflix-eureka-client/src/main/java/org/springframework/cloud/netflix/eureka/TimeoutProperties.java

@@ -0,0 +1,92 @@
+/*
+ * Copyright 2013-2024 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.cloud.netflix.eureka;
+
+import java.util.Objects;
+
+import com.netflix.discovery.shared.transport.EurekaHttpClient;
+import org.apache.hc.client5.http.config.RequestConfig;
+import org.apache.hc.core5.http.io.SocketConfig;
+
+import org.springframework.web.client.RestTemplate;
+
+/**
+ * Properties for configuring timeouts used in {@link RestTemplate} required by
+ * {@link EurekaHttpClient}.
+ *
+ * @author Jiwon Jeon
+ * @author Mooyong Lee
+ * @author Olga Maciaszek-Sharma
+ * @since 4.2.0
+ */
+public abstract class TimeoutProperties {
+
+	/**
+	 * Default values are set to 180000, in keeping with {@link RequestConfig} and
+	 * {@link SocketConfig} defaults.
+	 */
+	protected int connectTimeout = 180000; // 3 * MINUTES
+
+	protected int connectRequestTimeout = 180000; // 3 * MINUTES
+
+	protected int socketTimeout = 180000; // 3 * MINUTES
+
+	public int getConnectTimeout() {
+		return connectTimeout;
+	}
+
+	public int getConnectRequestTimeout() {
+		return connectRequestTimeout;
+	}
+
+	public int getSocketTimeout() {
+		return socketTimeout;
+	}
+
+	public void setConnectTimeout(int connectTimeout) {
+		this.connectTimeout = connectTimeout;
+	}
+
+	public void setConnectRequestTimeout(int connectRequestTimeout) {
+		this.connectRequestTimeout = connectRequestTimeout;
+	}
+
+	public void setSocketTimeout(int socketTimeout) {
+		this.socketTimeout = socketTimeout;
+	}
+
+	@Override
+	public boolean equals(Object o) {
+		if (this == o) {
+			return true;
+		}
+		if (o == null || getClass() != o.getClass()) {
+			return false;
+		}
+
+		RestTemplateTimeoutProperties that = (RestTemplateTimeoutProperties) o;
+
+		return connectTimeout == that.connectTimeout && connectRequestTimeout == that.connectRequestTimeout
+				&& socketTimeout == that.socketTimeout;
+	}
+
+	@Override
+	public int hashCode() {
+		return Objects.hash(connectTimeout, connectRequestTimeout, socketTimeout);
+	}
+
+}

spring-cloud-netflix-eureka-client/src/main/java/org/springframework/cloud/netflix/eureka/config/DiscoveryClientOptionalArgsConfiguration.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2017-2022 the original author or authors.
+ * Copyright 2017-2025 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -18,6 +18,7 @@ package org.springframework.cloud.netflix.eureka.config;
 
 import java.io.IOException;
 import java.security.GeneralSecurityException;
+import java.util.Set;
 
 import com.netflix.discovery.AbstractDiscoveryClientOptionalArgs;
 import com.netflix.discovery.shared.transport.jersey.TransportClientFactories;
@@ -25,7 +26,8 @@ import org.apache.commons.logging.Log;
 import org.apache.commons.logging.LogFactory;
 
 import org.springframework.beans.factory.ObjectProvider;
-import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.autoconfigure.condition.AllNestedConditions;
+import org.springframework.boot.autoconfigure.condition.AnyNestedCondition;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnBean;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnClass;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean;
@@ -34,24 +36,34 @@ import org.springframework.boot.autoconfigure.condition.ConditionalOnProperty;
 import org.springframework.boot.autoconfigure.condition.SearchStrategy;
 import org.springframework.boot.context.properties.ConfigurationProperties;
 import org.springframework.boot.context.properties.EnableConfigurationProperties;
+import org.springframework.boot.web.client.RestTemplateBuilder;
 import org.springframework.cloud.configuration.SSLContextFactory;
 import org.springframework.cloud.configuration.TlsProperties;
+import org.springframework.cloud.netflix.eureka.RestClientTimeoutProperties;
 import org.springframework.cloud.netflix.eureka.RestTemplateTimeoutProperties;
 import org.springframework.cloud.netflix.eureka.http.DefaultEurekaClientHttpRequestFactorySupplier;
 import org.springframework.cloud.netflix.eureka.http.EurekaClientHttpRequestFactorySupplier;
+import org.springframework.cloud.netflix.eureka.http.RestClientDiscoveryClientOptionalArgs;
+import org.springframework.cloud.netflix.eureka.http.RestClientTransportClientFactories;
 import org.springframework.cloud.netflix.eureka.http.RestTemplateDiscoveryClientOptionalArgs;
 import org.springframework.cloud.netflix.eureka.http.RestTemplateTransportClientFactories;
 import org.springframework.cloud.netflix.eureka.http.WebClientDiscoveryClientOptionalArgs;
 import org.springframework.cloud.netflix.eureka.http.WebClientTransportClientFactories;
 import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Conditional;
 import org.springframework.context.annotation.Configuration;
+import org.springframework.web.client.RestClient;
+import org.springframework.web.client.RestTemplate;
 import org.springframework.web.reactive.function.client.WebClient;
 
 /**
  * @author Daniel Lavoie
+ * @author Armin Krezovic
+ * @author Olga Maciaszek-Sharma
+ * @author Wonchul Heo
  */
 @Configuration(proxyBeanMethods = false)
-@EnableConfigurationProperties(RestTemplateTimeoutProperties.class)
+@EnableConfigurationProperties({ RestTemplateTimeoutProperties.class, RestClientTimeoutProperties.class })
 public class DiscoveryClientOptionalArgsConfiguration {
 
 	protected static final Log logger = LogFactory.getLog(DiscoveryClientOptionalArgsConfiguration.class);
@@ -62,42 +74,8 @@ public class DiscoveryClientOptionalArgsConfiguration {
 		return new TlsProperties();
 	}
 
-	@Bean
-	@ConditionalOnClass(name = "org.springframework.web.client.RestTemplate")
-	@ConditionalOnMissingClass("org.glassfish.jersey.client.JerseyClient")
-	@ConditionalOnMissingBean(value = { AbstractDiscoveryClientOptionalArgs.class }, search = SearchStrategy.CURRENT)
-	@ConditionalOnProperty(prefix = "eureka.client", name = "webclient.enabled", matchIfMissing = true,
-			havingValue = "false")
-	public RestTemplateDiscoveryClientOptionalArgs restTemplateDiscoveryClientOptionalArgs(TlsProperties tlsProperties,
-			EurekaClientHttpRequestFactorySupplier eurekaClientHttpRequestFactorySupplier)
-			throws GeneralSecurityException, IOException {
-		logger.info("Eureka HTTP Client uses RestTemplate.");
-		RestTemplateDiscoveryClientOptionalArgs result = new RestTemplateDiscoveryClientOptionalArgs(
-				eurekaClientHttpRequestFactorySupplier);
-		setupTLS(result, tlsProperties);
-		return result;
-	}
-
-	@Bean
-	@ConditionalOnClass(name = "org.springframework.web.client.RestTemplate")
-	@ConditionalOnMissingClass("org.glassfish.jersey.client.JerseyClient")
-	@ConditionalOnMissingBean(value = { TransportClientFactories.class }, search = SearchStrategy.CURRENT)
-	@ConditionalOnProperty(prefix = "eureka.client", name = "webclient.enabled", matchIfMissing = true,
-			havingValue = "false")
-	public RestTemplateTransportClientFactories restTemplateTransportClientFactories(
-			RestTemplateDiscoveryClientOptionalArgs optionalArgs) {
-		return new RestTemplateTransportClientFactories(optionalArgs);
-	}
-
-	@Bean
-	@ConditionalOnMissingBean
-	@ConditionalOnClass(name = "org.springframework.web.client.RestTemplate")
-	EurekaClientHttpRequestFactorySupplier defaultEurekaClientHttpRequestFactorySupplier(
-			RestTemplateTimeoutProperties restTemplateTimeoutProperties) {
-		return new DefaultEurekaClientHttpRequestFactorySupplier(restTemplateTimeoutProperties);
-	}
-
-	private static void setupTLS(AbstractDiscoveryClientOptionalArgs<?> args, TlsProperties properties)
+	// Visible for tests
+	public static void setupTLS(AbstractDiscoveryClientOptionalArgs<?> args, TlsProperties properties)
 			throws GeneralSecurityException, IOException {
 		if (properties.isEnabled()) {
 			SSLContextFactory factory = new SSLContextFactory(properties);
@@ -105,34 +83,79 @@ public class DiscoveryClientOptionalArgsConfiguration {
 		}
 	}
 
+	/**
+	 * @deprecated {@link RestTemplate}-based implementation to be removed in favour of
+	 * {@link RestClient}-based implementation.
+	 */
 	@Configuration(proxyBeanMethods = false)
-	@ConditionalOnClass(name = "org.glassfish.jersey.client.JerseyClient")
+	@Conditional(OnRestTemplatePresentAndEnabledCondition.class)
+	@Deprecated
+	static class RestTemplateConfiguration {
+
+		@Bean
+		@ConditionalOnMissingBean
+		EurekaClientHttpRequestFactorySupplier defaultEurekaClientHttpRequestFactorySupplier(
+				RestTemplateTimeoutProperties restTemplateTimeoutProperties,
+				Set<EurekaClientHttpRequestFactorySupplier.RequestConfigCustomizer> requestConfigCustomizers) {
+			return new DefaultEurekaClientHttpRequestFactorySupplier(restTemplateTimeoutProperties,
+					requestConfigCustomizers);
+		}
+
+		@Bean
+		@ConditionalOnMissingBean(value = { AbstractDiscoveryClientOptionalArgs.class },
+				search = SearchStrategy.CURRENT)
+		public RestTemplateDiscoveryClientOptionalArgs restTemplateDiscoveryClientOptionalArgs(
+				TlsProperties tlsProperties,
+				EurekaClientHttpRequestFactorySupplier eurekaClientHttpRequestFactorySupplier,
+				ObjectProvider<RestTemplateBuilder> restTemplateBuilders) throws GeneralSecurityException, IOException {
+			if (logger.isInfoEnabled()) {
+				logger.info("Eureka HTTP Client uses RestTemplate.");
+			}
+			RestTemplateDiscoveryClientOptionalArgs result = new RestTemplateDiscoveryClientOptionalArgs(
+					eurekaClientHttpRequestFactorySupplier, restTemplateBuilders::getIfAvailable);
+			setupTLS(result, tlsProperties);
+			return result;
+		}
+
+		@Bean
+		@ConditionalOnMissingBean(value = { TransportClientFactories.class }, search = SearchStrategy.CURRENT)
+		public RestTemplateTransportClientFactories restTemplateTransportClientFactories(
+				RestTemplateDiscoveryClientOptionalArgs optionalArgs) {
+			return new RestTemplateTransportClientFactories(optionalArgs);
+		}
+
+	}
+
+	@Configuration(proxyBeanMethods = false)
+	@Conditional(OnJerseyClientPresentAndEnabledCondition.class)
 	@ConditionalOnBean(value = AbstractDiscoveryClientOptionalArgs.class, search = SearchStrategy.CURRENT)
 	static class DiscoveryClientOptionalArgsTlsConfiguration {
 
 		DiscoveryClientOptionalArgsTlsConfiguration(TlsProperties tlsProperties,
 				AbstractDiscoveryClientOptionalArgs optionalArgs) throws GeneralSecurityException, IOException {
-			logger.info("Eureka HTTP Client uses Jersey");
+			if (logger.isInfoEnabled()) {
+				logger.info("Eureka HTTP Client uses Jersey");
+			}
 			setupTLS(optionalArgs, tlsProperties);
 		}
 
 	}
 
-	@ConditionalOnMissingClass("org.glassfish.jersey.client.JerseyClient")
+	@Configuration(proxyBeanMethods = false)
+	@Conditional(OnJerseyClientNotPresentOrNotEnabledCondition.class)
 	@ConditionalOnClass(name = "org.springframework.web.reactive.function.client.WebClient")
 	@ConditionalOnProperty(prefix = "eureka.client", name = "webclient.enabled", havingValue = "true")
 	protected static class WebClientConfiguration {
 
-		@Autowired
-		private TlsProperties tlsProperties;
-
 		@Bean
 		@ConditionalOnMissingBean(
 				value = { AbstractDiscoveryClientOptionalArgs.class, RestTemplateDiscoveryClientOptionalArgs.class },
 				search = SearchStrategy.CURRENT)
-		public WebClientDiscoveryClientOptionalArgs webClientDiscoveryClientOptionalArgs(
+		public WebClientDiscoveryClientOptionalArgs webClientDiscoveryClientOptionalArgs(TlsProperties tlsProperties,
 				ObjectProvider<WebClient.Builder> builder) throws GeneralSecurityException, IOException {
-			logger.info("Eureka HTTP Client uses WebClient.");
+			if (logger.isInfoEnabled()) {
+				logger.info("Eureka HTTP Client uses WebClient.");
+			}
 			WebClientDiscoveryClientOptionalArgs result = new WebClientDiscoveryClientOptionalArgs(
 					builder::getIfAvailable);
 			setupTLS(result, tlsProperties);
@@ -148,9 +171,9 @@ public class DiscoveryClientOptionalArgsConfiguration {
 
 	}
 
-	@Configuration
-	@ConditionalOnMissingClass({ "org.glassfish.jersey.client.JerseyClient",
-			"org.springframework.web.reactive.function.client.WebClient" })
+	@Configuration(proxyBeanMethods = false)
+	@Conditional(OnJerseyClientNotPresentOrNotEnabledCondition.class)
+	@ConditionalOnMissingClass("org.springframework.web.reactive.function.client.WebClient")
 	@ConditionalOnProperty(prefix = "eureka.client", name = "webclient.enabled", havingValue = "true")
 	protected static class WebClientNotFoundConfiguration {
 
@@ -162,4 +185,143 @@ public class DiscoveryClientOptionalArgsConfiguration {
 
 	}
 
+	@Configuration(proxyBeanMethods = false)
+	@Conditional(OnRestClientPresentAndEnabledCondition.class)
+	protected static class RestClientConfiguration {
+
+		@Bean
+		@ConditionalOnMissingBean
+		EurekaClientHttpRequestFactorySupplier defaultEurekaClientHttpRequestFactorySupplier(
+				RestClientTimeoutProperties restClientTimeoutProperties,
+				Set<EurekaClientHttpRequestFactorySupplier.RequestConfigCustomizer> requestConfigCustomizers) {
+			return new DefaultEurekaClientHttpRequestFactorySupplier(restClientTimeoutProperties,
+					requestConfigCustomizers);
+		}
+
+		@Bean
+		@ConditionalOnMissingBean(value = { AbstractDiscoveryClientOptionalArgs.class },
+				search = SearchStrategy.CURRENT)
+		public RestClientDiscoveryClientOptionalArgs restClientDiscoveryClientOptionalArgs(TlsProperties tlsProperties,
+				EurekaClientHttpRequestFactorySupplier eurekaClientHttpRequestFactorySupplier,
+				ObjectProvider<RestClient.Builder> restClientBuilderProvider)
+				throws GeneralSecurityException, IOException {
+			if (logger.isInfoEnabled()) {
+				logger.info("Eureka HTTP Client uses RestClient.");
+			}
+			RestClientDiscoveryClientOptionalArgs result = new RestClientDiscoveryClientOptionalArgs(
+					eurekaClientHttpRequestFactorySupplier,
+					() -> restClientBuilderProvider.getIfAvailable(RestClient::builder));
+			setupTLS(result, tlsProperties);
+			return result;
+		}
+
+		@Bean
+		@ConditionalOnMissingBean(value = TransportClientFactories.class, search = SearchStrategy.CURRENT)
+		public RestClientTransportClientFactories restClientTransportClientFactories(
+				RestClientDiscoveryClientOptionalArgs args) {
+			return new RestClientTransportClientFactories(args);
+		}
+
+	}
+
+	static class OnJerseyClientPresentAndEnabledCondition extends AllNestedConditions {
+
+		OnJerseyClientPresentAndEnabledCondition() {
+			super(ConfigurationPhase.REGISTER_BEAN);
+		}
+
+		@ConditionalOnClass(name = "org.glassfish.jersey.client.JerseyClient")
+		static class OnJerseyClientPresent {
+
+		}
+
+		@ConditionalOnProperty(value = "eureka.client.jersey.enabled", matchIfMissing = true)
+		static class OnJerseyClientEnabled {
+
+		}
+
+	}
+
+	static class OnJerseyClientNotPresentOrNotEnabledCondition extends AnyNestedCondition {
+
+		OnJerseyClientNotPresentOrNotEnabledCondition() {
+			super(ConfigurationPhase.REGISTER_BEAN);
+		}
+
+		@ConditionalOnMissingClass("org.glassfish.jersey.client.JerseyClient")
+		static class OnJerseyClientMissing {
+
+		}
+
+		@ConditionalOnProperty(value = "eureka.client.jersey.enabled", havingValue = "false")
+		static class OnJerseyClientDisabled {
+
+		}
+
+	}
+
+	/**
+	 * @deprecated {@link RestTemplate}-based implementation to be removed in favour of
+	 * {@link RestClient}-based implementation.
+	 */
+	@Deprecated(forRemoval = true)
+	static class OnRestTemplatePresentAndEnabledCondition extends AllNestedConditions {
+
+		OnRestTemplatePresentAndEnabledCondition() {
+			super(ConfigurationPhase.REGISTER_BEAN);
+		}
+
+		@ConditionalOnClass(name = "org.springframework.web.client.RestTemplate")
+		static class OnRestTemplatePresent {
+
+		}
+
+		@Conditional(OnJerseyClientNotPresentOrNotEnabledCondition.class)
+		static class OnJerseyClientNotPresentOrNotEnabled {
+
+		}
+
+		@ConditionalOnProperty(prefix = "eureka.client", name = "webclient.enabled", matchIfMissing = true,
+				havingValue = "false")
+		static class OnWebClientDisabled {
+
+		}
+
+		@ConditionalOnProperty(prefix = "eureka.client", name = "restclient.enabled", havingValue = "false",
+				matchIfMissing = true)
+		static class OnRestClientDisabled {
+
+		}
+
+	}
+
+	static class OnRestClientPresentAndEnabledCondition extends AllNestedConditions {
+
+		OnRestClientPresentAndEnabledCondition() {
+			super(ConfigurationPhase.REGISTER_BEAN);
+		}
+
+		@ConditionalOnClass(name = "org.springframework.web.client.RestClient")
+		static class OnRestClientPresent {
+
+		}
+
+		@Conditional(OnJerseyClientNotPresentOrNotEnabledCondition.class)
+		static class OnJerseyClientNotPresentOrNotEnabled {
+
+		}
+
+		@ConditionalOnProperty(prefix = "eureka.client", name = "webclient.enabled", matchIfMissing = true,
+				havingValue = "false")
+		static class OnWebClientDisabled {
+
+		}
+
+		@ConditionalOnProperty(prefix = "eureka.client", name = "restclient.enabled", havingValue = "true")
+		static class OnRestClientEnabled {
+
+		}
+
+	}
+
 }

spring-cloud-netflix-eureka-client/src/main/java/org/springframework/cloud/netflix/eureka/config/EurekaConfigServerBootstrapConfiguration.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2013-2022 the original author or authors.
+ * Copyright 2013-2025 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -16,6 +16,8 @@
 
 package org.springframework.cloud.netflix.eureka.config;
 
+import java.util.Set;
+
 import com.netflix.discovery.EurekaClientConfig;
 import com.netflix.discovery.shared.transport.EurekaHttpClient;
 
@@ -29,12 +31,17 @@ import org.springframework.boot.autoconfigure.condition.SearchStrategy;
 import org.springframework.boot.autoconfigure.http.codec.CodecsAutoConfiguration;
 import org.springframework.boot.autoconfigure.web.reactive.function.client.WebClientAutoConfiguration;
 import org.springframework.boot.context.properties.EnableConfigurationProperties;
+import org.springframework.boot.web.client.RestTemplateBuilder;
 import org.springframework.cloud.config.client.ConfigServerInstanceProvider;
 import org.springframework.cloud.config.client.ConfigServicePropertySourceLocator;
 import org.springframework.cloud.configuration.TlsProperties;
 import org.springframework.cloud.netflix.eureka.EurekaClientConfigBean;
+import org.springframework.cloud.netflix.eureka.RestClientTimeoutProperties;
+import org.springframework.cloud.netflix.eureka.RestTemplateTimeoutProperties;
 import org.springframework.cloud.netflix.eureka.http.DefaultEurekaClientHttpRequestFactorySupplier;
 import org.springframework.cloud.netflix.eureka.http.EurekaClientHttpRequestFactorySupplier;
+import org.springframework.cloud.netflix.eureka.http.RestClientEurekaHttpClient;
+import org.springframework.cloud.netflix.eureka.http.RestClientTransportClientFactory;
 import org.springframework.cloud.netflix.eureka.http.RestTemplateEurekaHttpClient;
 import org.springframework.cloud.netflix.eureka.http.RestTemplateTransportClientFactory;
 import org.springframework.cloud.netflix.eureka.http.WebClientEurekaHttpClient;
@@ -44,18 +51,23 @@ import org.springframework.context.annotation.Conditional;
 import org.springframework.context.annotation.Configuration;
 import org.springframework.core.env.Environment;
 import org.springframework.lang.Nullable;
+import org.springframework.web.client.RestClient;
+import org.springframework.web.client.RestTemplate;
 import org.springframework.web.reactive.function.client.WebClient;
 
 /**
- * Bootstrap configuration for config client that wants to lookup the config server via
+ * Bootstrap configuration for config client that wants to look the config server up via
  * discovery.
  *
  * @author Dave Syer
+ * @author Armin Krezovic
+ * @author Wonchul Heo
+ * @author Olga Maciaszek-Sharma
  */
 @ConditionalOnClass(ConfigServicePropertySourceLocator.class)
 @Conditional(EurekaConfigServerBootstrapConfiguration.EurekaConfigServerBootstrapCondition.class)
 @Configuration(proxyBeanMethods = false)
-@EnableConfigurationProperties
+@EnableConfigurationProperties({ RestTemplateTimeoutProperties.class, RestClientTimeoutProperties.class })
 public class EurekaConfigServerBootstrapConfiguration {
 
 	@Bean
@@ -64,30 +76,73 @@ public class EurekaConfigServerBootstrapConfiguration {
 		return new EurekaClientConfigBean();
 	}
 
-	@Bean
-	@ConditionalOnMissingBean(EurekaHttpClient.class)
-	@ConditionalOnProperty(prefix = "eureka.client", name = "webclient.enabled", matchIfMissing = true,
-			havingValue = "false")
-	public RestTemplateEurekaHttpClient configDiscoveryRestTemplateEurekaHttpClient(EurekaClientConfigBean config,
-			Environment env, @Nullable TlsProperties properties,
-			EurekaClientHttpRequestFactorySupplier eurekaClientHttpRequestFactorySupplier) {
-		return (RestTemplateEurekaHttpClient) new RestTemplateTransportClientFactory(properties,
-				eurekaClientHttpRequestFactorySupplier)
-						.newClient(HostnameBasedUrlRandomizer.randomEndpoint(config, env));
-	}
-
-	@Bean
-	@ConditionalOnMissingBean
-	EurekaClientHttpRequestFactorySupplier defaultEurekaClientHttpRequestFactorySupplier() {
-		return new DefaultEurekaClientHttpRequestFactorySupplier();
-	}
-
 	@Bean
 	public ConfigServerInstanceProvider.Function eurekaConfigServerInstanceProvider(EurekaHttpClient client,
 			EurekaClientConfig config) {
 		return new EurekaConfigServerInstanceProvider(client, config)::getInstances;
 	}
 
+	/**
+	 * @deprecated {@link RestTemplate}-based implementation to be removed in favour of
+	 * {@link RestClient}-based implementation.
+	 */
+	@Configuration(proxyBeanMethods = false)
+	@Conditional(RestTemplateConfiguration.OnRestTemplatePresentAndEnabledCondition.class)
+	@Deprecated
+	static class RestTemplateConfiguration {
+
+		@Bean
+		@ConditionalOnMissingBean(EurekaHttpClient.class)
+		public RestTemplateEurekaHttpClient configDiscoveryRestTemplateEurekaHttpClient(EurekaClientConfigBean config,
+				Environment env, @Nullable TlsProperties properties,
+				EurekaClientHttpRequestFactorySupplier eurekaClientHttpRequestFactorySupplier,
+				ObjectProvider<RestTemplateBuilder> restTemplateBuilders) {
+			return (RestTemplateEurekaHttpClient) new RestTemplateTransportClientFactory(properties,
+					eurekaClientHttpRequestFactorySupplier, restTemplateBuilders::getIfAvailable)
+				.newClient(HostnameBasedUrlRandomizer.randomEndpoint(config, env));
+		}
+
+		@Bean
+		@ConditionalOnMissingBean
+		EurekaClientHttpRequestFactorySupplier defaultEurekaClientHttpRequestFactorySupplier(
+				RestTemplateTimeoutProperties restTemplateTimeoutProperties,
+				Set<EurekaClientHttpRequestFactorySupplier.RequestConfigCustomizer> requestConfigCustomizers) {
+			return new DefaultEurekaClientHttpRequestFactorySupplier(restTemplateTimeoutProperties,
+					requestConfigCustomizers);
+		}
+
+		/**
+		 * @deprecated {@link RestTemplate}-based implementation to be removed in favour
+		 * of {@link RestClient}-based implementation.
+		 */
+		@Deprecated(forRemoval = true)
+		static class OnRestTemplatePresentAndEnabledCondition extends AllNestedConditions {
+
+			OnRestTemplatePresentAndEnabledCondition() {
+				super(ConfigurationPhase.REGISTER_BEAN);
+			}
+
+			@ConditionalOnClass(name = "org.springframework.web.client.RestTemplate")
+			static class OnRestTemplatePresent {
+
+			}
+
+			@ConditionalOnProperty(prefix = "eureka.client", name = "webclient.enabled", matchIfMissing = true,
+					havingValue = "false")
+			static class OnWebClientDisabled {
+
+			}
+
+			@ConditionalOnProperty(prefix = "eureka.client", name = "restclient.enabled", havingValue = "false",
+					matchIfMissing = true)
+			static class OnRestClientDisabled {
+
+			}
+
+		}
+
+	}
+
 	@Configuration(proxyBeanMethods = false)
 	@ConditionalOnClass(name = "org.springframework.web.reactive.function.client.WebClient")
 	@ConditionalOnProperty(prefix = "eureka.client", name = "webclient.enabled", havingValue = "true")
@@ -99,7 +154,58 @@ public class EurekaConfigServerBootstrapConfiguration {
 		public WebClientEurekaHttpClient configDiscoveryWebClientEurekaHttpClient(EurekaClientConfigBean config,
 				ObjectProvider<WebClient.Builder> builder, Environment env) {
 			return (WebClientEurekaHttpClient) new WebClientTransportClientFactory(builder::getIfAvailable)
-					.newClient(HostnameBasedUrlRandomizer.randomEndpoint(config, env));
+				.newClient(HostnameBasedUrlRandomizer.randomEndpoint(config, env));
+		}
+
+	}
+
+	@Configuration(proxyBeanMethods = false)
+	@Conditional(RestClientConfiguration.OnRestClientPresentAndEnabledCondition.class)
+	static class RestClientConfiguration {
+
+		@Bean
+		@ConditionalOnMissingBean(EurekaHttpClient.class)
+		public RestClientEurekaHttpClient configDiscoveryRestClientEurekaHttpClient(EurekaClientConfigBean config,
+				@Nullable TlsProperties properties,
+				EurekaClientHttpRequestFactorySupplier eurekaClientHttpRequestFactorySupplier,
+				ObjectProvider<RestClient.Builder> restClientBuilderProvider, Environment env) {
+			return (RestClientEurekaHttpClient) new RestClientTransportClientFactory(properties,
+					eurekaClientHttpRequestFactorySupplier,
+					() -> restClientBuilderProvider.getIfAvailable(RestClient::builder))
+				.newClient(HostnameBasedUrlRandomizer.randomEndpoint(config, env));
+		}
+
+		@Bean
+		@ConditionalOnMissingBean
+		EurekaClientHttpRequestFactorySupplier defaultEurekaClientHttpRequestFactorySupplier(
+				RestClientTimeoutProperties restClientTimeoutProperties,
+				Set<EurekaClientHttpRequestFactorySupplier.RequestConfigCustomizer> requestConfigCustomizers) {
+			return new DefaultEurekaClientHttpRequestFactorySupplier(restClientTimeoutProperties,
+					requestConfigCustomizers);
+		}
+
+		static class OnRestClientPresentAndEnabledCondition extends AllNestedConditions {
+
+			OnRestClientPresentAndEnabledCondition() {
+				super(ConfigurationPhase.REGISTER_BEAN);
+			}
+
+			@ConditionalOnClass(name = "org.springframework.web.client.RestClient")
+			static class OnRestClientPresentCondition {
+
+			}
+
+			@ConditionalOnProperty(prefix = "eureka.client", name = "webclient.enabled", matchIfMissing = true,
+					havingValue = "false")
+			static class OnWebClientDisabled {
+
+			}
+
+			@ConditionalOnProperty(prefix = "eureka.client", name = "restclient.enabled", havingValue = "true")
+			static class OnRestClientEnabled {
+
+			}
+
 		}
 
 	}

spring-cloud-netflix-eureka-client/src/main/java/org/springframework/cloud/netflix/eureka/config/EurekaConfigServerBootstrapper.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2013-2022 the original author or authors.
+ * Copyright 2013-2025 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -30,9 +30,10 @@ import org.springframework.cloud.config.client.ConfigServerConfigDataLocationRes
 import org.springframework.cloud.config.client.ConfigServerInstanceProvider;
 import org.springframework.cloud.configuration.TlsProperties;
 import org.springframework.cloud.netflix.eureka.EurekaClientConfigBean;
+import org.springframework.cloud.netflix.eureka.RestClientTimeoutProperties;
 import org.springframework.cloud.netflix.eureka.http.DefaultEurekaClientHttpRequestFactorySupplier;
 import org.springframework.cloud.netflix.eureka.http.EurekaClientHttpRequestFactorySupplier;
-import org.springframework.cloud.netflix.eureka.http.RestTemplateTransportClientFactory;
+import org.springframework.cloud.netflix.eureka.http.RestClientTransportClientFactory;
 import org.springframework.util.ClassUtils;
 
 public class EurekaConfigServerBootstrapper implements BootstrapRegistryInitializer {
@@ -57,11 +58,12 @@ public class EurekaConfigServerBootstrapper implements BootstrapRegistryInitiali
 				return (id) -> Collections.emptyList();
 			}
 			EurekaClientConfigBean config = context.get(EurekaClientConfigBean.class);
-			EurekaHttpClient httpClient = new RestTemplateTransportClientFactory(
+			EurekaHttpClient httpClient = new RestClientTransportClientFactory(
 					context.getOrElse(TlsProperties.class, null),
 					context.getOrElse(EurekaClientHttpRequestFactorySupplier.class,
-							new DefaultEurekaClientHttpRequestFactorySupplier())).newClient(
-									HostnameBasedUrlRandomizer.randomEndpoint(config, getPropertyResolver(context)));
+							new DefaultEurekaClientHttpRequestFactorySupplier(new RestClientTimeoutProperties(),
+									Collections.emptySet())))
+				.newClient(HostnameBasedUrlRandomizer.randomEndpoint(config, getPropertyResolver(context)));
 			return new EurekaConfigServerInstanceProvider(httpClient, config)::getInstances;
 		});
 	}

spring-cloud-netflix-eureka-client/src/main/java/org/springframework/cloud/netflix/eureka/config/EurekaConfigServerInstanceProvider.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2013-2022 the original author or authors.
+ * Copyright 2013-2024 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -31,6 +31,9 @@ import org.springframework.cloud.client.ServiceInstance;
 import org.springframework.cloud.netflix.eureka.EurekaServiceInstance;
 import org.springframework.http.HttpStatus;
 
+/**
+ * @author Tang Xiong
+ */
 public class EurekaConfigServerInstanceProvider {
 
 	private final Log log;
@@ -53,7 +56,11 @@ public class EurekaConfigServerInstanceProvider {
 		if (log.isDebugEnabled()) {
 			log.debug("eurekaConfigServerInstanceProvider finding instances for " + serviceId);
 		}
-		EurekaHttpResponse<Applications> response = client.getApplications(config.getRegion());
+		String remoteRegionsStr = config.fetchRegistryForRemoteRegions();
+		String[] remoteRegions = remoteRegionsStr == null ? null : remoteRegionsStr.split(",");
+		EurekaHttpResponse<Applications> response = config.getRegistryRefreshSingleVipAddress() == null
+				? client.getApplications(remoteRegions)
+				: client.getVip(config.getRegistryRefreshSingleVipAddress(), remoteRegions);
 		List<ServiceInstance> instances = new ArrayList<>();
 		if (!isSuccessful(response) || response.getEntity() == null) {
 			return instances;

spring-cloud-netflix-eureka-client/src/main/java/org/springframework/cloud/netflix/eureka/http/DefaultEurekaClientHttpRequestFactorySupplier.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2013-2022 the original author or authors.
+ * Copyright 2013-2025 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -16,11 +16,14 @@
 
 package org.springframework.cloud.netflix.eureka.http;
 
+import java.util.Collections;
+import java.util.Set;
 import java.util.concurrent.TimeUnit;
 
 import javax.net.ssl.HostnameVerifier;
 import javax.net.ssl.SSLContext;
 
+import org.apache.hc.client5.http.config.ConnectionConfig;
 import org.apache.hc.client5.http.config.RequestConfig;
 import org.apache.hc.client5.http.impl.classic.CloseableHttpClient;
 import org.apache.hc.client5.http.impl.classic.HttpClientBuilder;
@@ -32,6 +35,7 @@ import org.apache.hc.core5.http.io.SocketConfig;
 import org.apache.hc.core5.util.Timeout;
 
 import org.springframework.cloud.netflix.eureka.RestTemplateTimeoutProperties;
+import org.springframework.cloud.netflix.eureka.TimeoutProperties;
 import org.springframework.http.client.ClientHttpRequestFactory;
 import org.springframework.http.client.HttpComponentsClientHttpRequestFactory;
 import org.springframework.lang.Nullable;
@@ -47,31 +51,52 @@ import org.springframework.lang.Nullable;
  */
 public class DefaultEurekaClientHttpRequestFactorySupplier implements EurekaClientHttpRequestFactorySupplier {
 
-	private final RestTemplateTimeoutProperties restTemplateTimeoutProperties;
+	private final TimeoutProperties timeoutProperties;
+
+	// TODO: switch to final after removing deprecated interfaces
+	private Set<RequestConfigCustomizer> requestConfigCustomizers = Collections.emptySet();
 
 	/**
 	 * @deprecated in favour of
-	 * {@link DefaultEurekaClientHttpRequestFactorySupplier#DefaultEurekaClientHttpRequestFactorySupplier(RestTemplateTimeoutProperties)}
+	 * {@link DefaultEurekaClientHttpRequestFactorySupplier#DefaultEurekaClientHttpRequestFactorySupplier(TimeoutProperties, Set)}
 	 */
-	@Deprecated
+	@Deprecated(forRemoval = true)
 	public DefaultEurekaClientHttpRequestFactorySupplier() {
-		this.restTemplateTimeoutProperties = new RestTemplateTimeoutProperties();
+		this.timeoutProperties = new RestTemplateTimeoutProperties();
 	}
 
-	public DefaultEurekaClientHttpRequestFactorySupplier(RestTemplateTimeoutProperties restTemplateTimeoutProperties) {
-		this.restTemplateTimeoutProperties = restTemplateTimeoutProperties;
+	/**
+	 * @deprecated in favour of
+	 * {@link DefaultEurekaClientHttpRequestFactorySupplier#DefaultEurekaClientHttpRequestFactorySupplier(TimeoutProperties, Set)}
+	 */
+	@Deprecated(forRemoval = true)
+	public DefaultEurekaClientHttpRequestFactorySupplier(RestTemplateTimeoutProperties timeoutProperties) {
+		this.timeoutProperties = timeoutProperties;
+	}
+
+	/**
+	 * @deprecated in favour of
+	 * {@link DefaultEurekaClientHttpRequestFactorySupplier#DefaultEurekaClientHttpRequestFactorySupplier(TimeoutProperties, Set)}
+	 */
+	@Deprecated(forRemoval = true)
+	public DefaultEurekaClientHttpRequestFactorySupplier(TimeoutProperties timeoutProperties) {
+		this.timeoutProperties = timeoutProperties;
+	}
+
+	public DefaultEurekaClientHttpRequestFactorySupplier(TimeoutProperties timeoutProperties,
+			Set<RequestConfigCustomizer> requestConfigCustomizers) {
+		this.timeoutProperties = timeoutProperties;
+		this.requestConfigCustomizers = requestConfigCustomizers;
 	}
 
 	@Override
 	public ClientHttpRequestFactory get(SSLContext sslContext, @Nullable HostnameVerifier hostnameVerifier) {
 		HttpClientBuilder httpClientBuilder = HttpClientBuilder.create();
-		if (sslContext != null || hostnameVerifier != null || restTemplateTimeoutProperties != null) {
-			httpClientBuilder.setConnectionManager(
-					buildConnectionManager(sslContext, hostnameVerifier, restTemplateTimeoutProperties));
-		}
-		if (restTemplateTimeoutProperties != null) {
-			httpClientBuilder.setDefaultRequestConfig(buildRequestConfig());
+		if (sslContext != null || hostnameVerifier != null || timeoutProperties != null) {
+			httpClientBuilder
+				.setConnectionManager(buildConnectionManager(sslContext, hostnameVerifier, timeoutProperties));
 		}
+		httpClientBuilder.setDefaultRequestConfig(buildRequestConfig());
 
 		CloseableHttpClient httpClient = httpClientBuilder.build();
 		HttpComponentsClientHttpRequestFactory requestFactory = new HttpComponentsClientHttpRequestFactory();
@@ -80,11 +105,11 @@ public class DefaultEurekaClientHttpRequestFactorySupplier implements EurekaClie
 	}
 
 	private HttpClientConnectionManager buildConnectionManager(SSLContext sslContext, HostnameVerifier hostnameVerifier,
-			RestTemplateTimeoutProperties restTemplateTimeoutProperties) {
+			TimeoutProperties timeoutProperties) {
 		PoolingHttpClientConnectionManagerBuilder connectionManagerBuilder = PoolingHttpClientConnectionManagerBuilder
-				.create();
+			.create();
 		SSLConnectionSocketFactoryBuilder sslConnectionSocketFactoryBuilder = SSLConnectionSocketFactoryBuilder
-				.create();
+			.create();
 		if (sslContext != null) {
 			sslConnectionSocketFactoryBuilder.setSslContext(sslContext);
 		}
@@ -92,20 +117,25 @@ public class DefaultEurekaClientHttpRequestFactorySupplier implements EurekaClie
 			sslConnectionSocketFactoryBuilder.setHostnameVerifier(hostnameVerifier);
 		}
 		connectionManagerBuilder.setSSLSocketFactory(sslConnectionSocketFactoryBuilder.build());
-		if (restTemplateTimeoutProperties != null) {
+		if (timeoutProperties != null) {
 			connectionManagerBuilder.setDefaultSocketConfig(SocketConfig.custom()
-					.setSoTimeout(Timeout.of(restTemplateTimeoutProperties.getSocketTimeout(), TimeUnit.MILLISECONDS))
-					.build());
+				.setSoTimeout(Timeout.of(timeoutProperties.getSocketTimeout(), TimeUnit.MILLISECONDS))
+				.build());
+			connectionManagerBuilder.setDefaultConnectionConfig(ConnectionConfig.custom()
+				.setConnectTimeout(Timeout.of(timeoutProperties.getConnectTimeout(), TimeUnit.MILLISECONDS))
+				.build());
 		}
 		return connectionManagerBuilder.build();
 	}
 
 	private RequestConfig buildRequestConfig() {
-		return RequestConfig.custom()
-				.setConnectTimeout(Timeout.of(restTemplateTimeoutProperties.getConnectTimeout(), TimeUnit.MILLISECONDS))
-				.setConnectionRequestTimeout(
-						Timeout.of(restTemplateTimeoutProperties.getConnectRequestTimeout(), TimeUnit.MILLISECONDS))
-				.build();
+		RequestConfig.Builder requestConfigBuilder = RequestConfig.custom();
+		if (timeoutProperties != null) {
+			requestConfigBuilder.setConnectionRequestTimeout(
+					Timeout.of(timeoutProperties.getConnectRequestTimeout(), TimeUnit.MILLISECONDS));
+		}
+		requestConfigCustomizers.forEach(customizer -> customizer.customize(requestConfigBuilder));
+		return requestConfigBuilder.build();
 	}
 
 }

spring-cloud-netflix-eureka-client/src/main/java/org/springframework/cloud/netflix/eureka/http/EurekaClientHttpRequestFactorySupplier.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2013-2022 the original author or authors.
+ * Copyright 2013-2025 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -19,6 +19,8 @@ package org.springframework.cloud.netflix.eureka.http;
 import javax.net.ssl.HostnameVerifier;
 import javax.net.ssl.SSLContext;
 
+import org.apache.hc.client5.http.config.RequestConfig;
+
 import org.springframework.http.client.ClientHttpRequestFactory;
 import org.springframework.lang.Nullable;
 
@@ -38,4 +40,17 @@ public interface EurekaClientHttpRequestFactorySupplier {
 	 */
 	ClientHttpRequestFactory get(SSLContext sslContext, @Nullable HostnameVerifier hostnameVerifier);
 
+	/**
+	 * Allows customising the {@link RequestConfig} of the underlying Apache HC5 instance.
+	 *
+	 * @author Olga Maciaszek-Sharma
+	 * @since 4.2.1
+	 */
+	@FunctionalInterface
+	interface RequestConfigCustomizer {
+
+		void customize(RequestConfig.Builder builder);
+
+	}
+
 }

spring-cloud-netflix-eureka-client/src/main/java/org/springframework/cloud/netflix/eureka/http/EurekaHttpClientUtils.java

@@ -0,0 +1,147 @@
+/*
+ * Copyright 2017-2024 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.cloud.netflix.eureka.http;
+
+import java.net.URI;
+import java.net.URISyntaxException;
+import java.util.Optional;
+
+import javax.net.ssl.SSLContext;
+
+import com.fasterxml.jackson.databind.BeanDescription;
+import com.fasterxml.jackson.databind.DeserializationFeature;
+import com.fasterxml.jackson.databind.JsonSerializer;
+import com.fasterxml.jackson.databind.ObjectMapper;
+import com.fasterxml.jackson.databind.PropertyNamingStrategies;
+import com.fasterxml.jackson.databind.SerializationConfig;
+import com.fasterxml.jackson.databind.SerializationFeature;
+import com.fasterxml.jackson.databind.module.SimpleModule;
+import com.fasterxml.jackson.databind.ser.BeanSerializerModifier;
+import com.fasterxml.jackson.databind.ser.std.BeanSerializerBase;
+import com.netflix.appinfo.InstanceInfo;
+import com.netflix.discovery.converters.jackson.mixin.ApplicationsJsonMixIn;
+import com.netflix.discovery.converters.jackson.mixin.InstanceInfoJsonMixIn;
+import com.netflix.discovery.converters.jackson.serializer.InstanceInfoJsonBeanSerializer;
+import com.netflix.discovery.shared.Applications;
+import com.netflix.discovery.shared.transport.EurekaHttpClient;
+
+import org.springframework.cloud.configuration.SSLContextFactory;
+import org.springframework.cloud.configuration.TlsProperties;
+import org.springframework.http.converter.json.MappingJackson2HttpMessageConverter;
+import org.springframework.lang.Nullable;
+
+/**
+ * Utility class for dealing with {@link EurekaHttpClient}.
+ *
+ * @author Daniel Lavoie
+ * @author Wonchul Heo
+ * @author Olga Maciaszek-Sharma
+ * @since 4.2.0
+ */
+final class EurekaHttpClientUtils {
+
+	private EurekaHttpClientUtils() {
+		throw new AssertionError("Must not instantiate constant utility class");
+	}
+
+	/**
+	 * Provides the serialization configurations required by the Eureka Server. JSON
+	 * content exchanged with eureka requires a root node matching the entity being
+	 * serialized or deserialized. Achieved with
+	 * {@link SerializationFeature#WRAP_ROOT_VALUE} and
+	 * {@link DeserializationFeature#UNWRAP_ROOT_VALUE}.
+	 * {@link PropertyNamingStrategies.SnakeCaseStrategy} is applied to the underlying
+	 * {@link ObjectMapper}.
+	 * @return a {@link MappingJackson2HttpMessageConverter} object
+	 */
+	static MappingJackson2HttpMessageConverter mappingJacksonHttpMessageConverter() {
+		final MappingJackson2HttpMessageConverter converter = new MappingJackson2HttpMessageConverter();
+		converter.setObjectMapper(objectMapper());
+		return converter;
+	}
+
+	/**
+	 * Provides the serialization configurations required by the Eureka Server. JSON
+	 * content exchanged with eureka requires a root node matching the entity being
+	 * serialized or deserialized. Achieved with
+	 * {@link SerializationFeature#WRAP_ROOT_VALUE} and
+	 * {@link DeserializationFeature#UNWRAP_ROOT_VALUE}.
+	 * {@link PropertyNamingStrategies.SnakeCaseStrategy} is applied to the underlying
+	 * {@link ObjectMapper}.
+	 * @return a {@link ObjectMapper} object
+	 */
+	static ObjectMapper objectMapper() {
+		final ObjectMapper objectMapper = new ObjectMapper();
+		objectMapper.setPropertyNamingStrategy(PropertyNamingStrategies.SNAKE_CASE);
+
+		final SimpleModule jsonModule = new SimpleModule();
+		jsonModule.setSerializerModifier(createJsonSerializerModifier());
+		objectMapper.registerModule(jsonModule);
+
+		objectMapper.configure(SerializationFeature.WRAP_ROOT_VALUE, true);
+		objectMapper.configure(DeserializationFeature.UNWRAP_ROOT_VALUE, true);
+		objectMapper.addMixIn(Applications.class, ApplicationsJsonMixIn.class);
+		objectMapper.addMixIn(InstanceInfo.class, InstanceInfoJsonMixIn.class);
+
+		return objectMapper;
+	}
+
+	private static BeanSerializerModifier createJsonSerializerModifier() {
+		return new BeanSerializerModifier() {
+			@Override
+			public JsonSerializer<?> modifySerializer(SerializationConfig config, BeanDescription beanDesc,
+					JsonSerializer<?> serializer) {
+				if (beanDesc.getBeanClass().isAssignableFrom(InstanceInfo.class)) {
+					return new InstanceInfoJsonBeanSerializer((BeanSerializerBase) serializer, false);
+				}
+				return serializer;
+			}
+		};
+	}
+
+	@Nullable
+	static UserInfo extractUserInfo(String serviceUrl) {
+		try {
+			final URI serviceURI = new URI(serviceUrl);
+			if (serviceURI.getUserInfo() != null) {
+				final String[] credentials = serviceURI.getUserInfo().split(":");
+				if (credentials.length == 2) {
+					return new UserInfo(credentials[0], credentials[1]);
+				}
+			}
+		}
+		catch (URISyntaxException ignore) {
+		}
+		return null;
+	}
+
+	static Optional<SSLContext> context(TlsProperties properties) {
+		if (properties == null || !properties.isEnabled()) {
+			return Optional.empty();
+		}
+		try {
+			return Optional.of(new SSLContextFactory(properties).createSSLContext());
+		}
+		catch (Exception e) {
+			throw new IllegalStateException(e);
+		}
+	}
+
+	record UserInfo(String username, String password) {
+	}
+
+}

spring-cloud-netflix-eureka-client/src/main/java/org/springframework/cloud/netflix/eureka/http/NotFoundHttpResponse.java

@@ -0,0 +1,67 @@
+/*
+ * Copyright 2017-2024 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.cloud.netflix.eureka.http;
+
+import java.io.IOException;
+import java.io.InputStream;
+
+import org.springframework.http.HttpHeaders;
+import org.springframework.http.HttpStatusCode;
+import org.springframework.http.client.ClientHttpResponse;
+
+/**
+ * Response that ignores body, specifically for 404 errors.
+ *
+ * @author Spencer Gibb
+ * @author Wonchul Heo
+ * @since 4.2.0
+ */
+class NotFoundHttpResponse implements ClientHttpResponse {
+
+	private final ClientHttpResponse response;
+
+	NotFoundHttpResponse(ClientHttpResponse response) {
+		this.response = response;
+	}
+
+	@Override
+	public HttpStatusCode getStatusCode() throws IOException {
+		return response.getStatusCode();
+	}
+
+	@Override
+	public String getStatusText() throws IOException {
+		return response.getStatusText();
+	}
+
+	@Override
+	public void close() {
+		response.close();
+	}
+
+	@Override
+	public InputStream getBody() throws IOException {
+		// ignore body on 404 for heartbeat, see gh-4145
+		return null;
+	}
+
+	@Override
+	public HttpHeaders getHeaders() {
+		return response.getHeaders();
+	}
+
+}

spring-cloud-netflix-eureka-client/src/main/java/org/springframework/cloud/netflix/eureka/http/RestClientDiscoveryClientOptionalArgs.java

@@ -0,0 +1,55 @@
+/*
+ * Copyright 2017-2024 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.cloud.netflix.eureka.http;
+
+import java.util.function.Supplier;
+
+import com.netflix.discovery.AbstractDiscoveryClientOptionalArgs;
+import jakarta.ws.rs.client.ClientRequestFilter;
+
+import org.springframework.web.client.RestClient;
+
+/**
+ * {@link RestClient} implementation of DiscoveryClientOptionalArgs that supports
+ * supplying {@link ClientRequestFilter}.
+ *
+ * @author Wonchul Heo
+ * @author Olga Maciaszek-Sharma
+ * @since 4.2.0
+ */
+public class RestClientDiscoveryClientOptionalArgs extends AbstractDiscoveryClientOptionalArgs<Void> {
+
+	private final EurekaClientHttpRequestFactorySupplier eurekaClientHttpRequestFactorySupplier;
+
+	private final Supplier<RestClient.Builder> restClientBuilderSupplier;
+
+	public RestClientDiscoveryClientOptionalArgs(
+			EurekaClientHttpRequestFactorySupplier eurekaClientHttpRequestFactorySupplier,
+			Supplier<RestClient.Builder> restClientBuilderSupplier) {
+		this.eurekaClientHttpRequestFactorySupplier = eurekaClientHttpRequestFactorySupplier;
+		this.restClientBuilderSupplier = restClientBuilderSupplier;
+	}
+
+	EurekaClientHttpRequestFactorySupplier getEurekaClientHttpRequestFactorySupplier() {
+		return eurekaClientHttpRequestFactorySupplier;
+	}
+
+	Supplier<RestClient.Builder> getRestClientBuilderSupplier() {
+		return restClientBuilderSupplier;
+	}
+
+}

spring-cloud-netflix-eureka-client/src/main/java/org/springframework/cloud/netflix/eureka/http/RestClientEurekaHttpClient.java

@@ -0,0 +1,238 @@
+/*
+ * Copyright 2017-2024 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.cloud.netflix.eureka.http;
+
+import java.net.URI;
+import java.util.Map;
+import java.util.Optional;
+import java.util.function.Function;
+
+import com.netflix.appinfo.InstanceInfo;
+import com.netflix.appinfo.InstanceInfo.InstanceStatus;
+import com.netflix.discovery.shared.Application;
+import com.netflix.discovery.shared.Applications;
+import com.netflix.discovery.shared.transport.EurekaHttpClient;
+import com.netflix.discovery.shared.transport.EurekaHttpResponse;
+import com.netflix.discovery.shared.transport.EurekaHttpResponse.EurekaHttpResponseBuilder;
+import com.netflix.discovery.util.StringUtil;
+
+import org.springframework.http.HttpHeaders;
+import org.springframework.http.HttpStatus;
+import org.springframework.http.MediaType;
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.client.RestClient;
+import org.springframework.web.util.UriBuilder;
+
+import static com.netflix.discovery.shared.transport.EurekaHttpResponse.anEurekaHttpResponse;
+
+/**
+ * {@link RestClient} implementation of {@link EurekaHttpClient}.
+ *
+ * @author Wonchul Heo
+ * @since 4.2.0
+ */
+public class RestClientEurekaHttpClient implements EurekaHttpClient {
+
+	private final RestClient restClient;
+
+	public RestClientEurekaHttpClient(RestClient restClient) {
+		this.restClient = restClient;
+	}
+
+	@Override
+	public EurekaHttpResponse<Void> register(InstanceInfo info) {
+		final ResponseEntity<Void> response = restClient.post()
+			.uri(builder -> builder.pathSegment("apps", info.getAppName()).build())
+			.body(info)
+			.header(HttpHeaders.ACCEPT_ENCODING, "gzip")
+			.header(HttpHeaders.CONTENT_TYPE, MediaType.APPLICATION_JSON_VALUE)
+			.retrieve()
+			.toBodilessEntity();
+		return eurekaHttpResponse(response);
+	}
+
+	@Override
+	public EurekaHttpResponse<Void> cancel(String appName, String id) {
+		final ResponseEntity<Void> response = restClient.delete()
+			.uri(builder -> builder.pathSegment("apps", appName, id).build())
+			.retrieve()
+			.toBodilessEntity();
+		return eurekaHttpResponse(response);
+	}
+
+	@Override
+	public EurekaHttpResponse<InstanceInfo> sendHeartBeat(String appName, String id, InstanceInfo info,
+			InstanceStatus overriddenStatus) {
+		final Function<UriBuilder, URI> uriFunction = builder -> builder.pathSegment("apps", appName, id)
+			.queryParam("status", info.getStatus().toString())
+			.queryParam("lastDirtyTimestamp", info.getLastDirtyTimestamp().toString())
+			.queryParamIfPresent("overriddenstatus", Optional.ofNullable(overriddenStatus).map(InstanceStatus::name))
+			.build();
+
+		final ResponseEntity<InstanceInfo> response = restClient.put()
+			.uri(uriFunction)
+			.header(HttpHeaders.CONTENT_TYPE, MediaType.APPLICATION_JSON_VALUE)
+			.header(HttpHeaders.ACCEPT, MediaType.APPLICATION_JSON_VALUE)
+			.retrieve()
+			.toEntity(InstanceInfo.class);
+
+		final EurekaHttpResponseBuilder<InstanceInfo> builder = anEurekaHttpResponse(statusCodeValueOf(response),
+				InstanceInfo.class)
+			.headers(headersOf(response));
+
+		final InstanceInfo entity = response.getBody();
+		if (entity != null) {
+			builder.entity(entity);
+		}
+
+		return builder.build();
+	}
+
+	@Override
+	public EurekaHttpResponse<Void> statusUpdate(String appName, String id, InstanceStatus newStatus,
+			InstanceInfo info) {
+		final Function<UriBuilder, URI> uriFunction = builder -> builder.pathSegment("apps", appName, id, "status")
+			.queryParam("value", newStatus.name())
+			.queryParam("lastDirtyTimestamp", info.getLastDirtyTimestamp().toString())
+			.build();
+
+		final ResponseEntity<Void> response = restClient.put()
+			.uri(uriFunction)
+			.header(HttpHeaders.CONTENT_TYPE, MediaType.APPLICATION_JSON_VALUE)
+			.retrieve()
+			.toBodilessEntity();
+		return eurekaHttpResponse(response);
+	}
+
+	@Override
+	public EurekaHttpResponse<Void> deleteStatusOverride(String appName, String id, InstanceInfo info) {
+		final Function<UriBuilder, URI> uriFunction = builder -> builder.pathSegment("apps", appName, id, "status")
+			.queryParam("lastDirtyTimestamp", info.getLastDirtyTimestamp().toString())
+			.build();
+
+		final ResponseEntity<Void> response = restClient.delete()
+			.uri(uriFunction)
+			.header(HttpHeaders.CONTENT_TYPE, MediaType.APPLICATION_JSON_VALUE)
+			.retrieve()
+			.toBodilessEntity();
+		return eurekaHttpResponse(response);
+	}
+
+	@Override
+	public EurekaHttpResponse<Applications> getApplications(String... regions) {
+		return getApplicationsInternal("/apps/", regions);
+	}
+
+	@Override
+	public EurekaHttpResponse<Applications> getDelta(String... regions) {
+		return getApplicationsInternal("/apps/delta", regions);
+	}
+
+	@Override
+	public EurekaHttpResponse<Applications> getVip(String vipAddress, String... regions) {
+		return getApplicationsInternal("/vips/" + vipAddress, regions);
+	}
+
+	@Override
+	public EurekaHttpResponse<Applications> getSecureVip(String secureVipAddress, String... regions) {
+		return getApplicationsInternal("/svips/" + secureVipAddress, regions);
+	}
+
+	@Override
+	public EurekaHttpResponse<Application> getApplication(String appName) {
+
+		final ResponseEntity<Application> response = restClient.get()
+			.uri("/apps/" + appName)
+			.header(HttpHeaders.ACCEPT, MediaType.APPLICATION_JSON_VALUE)
+			.retrieve()
+			.toEntity(Application.class);
+
+		final int statusCode = statusCodeValueOf(response);
+		final Application body = response.getBody();
+
+		final Application application = statusCode == HttpStatus.OK.value() && body != null ? body : null;
+
+		return anEurekaHttpResponse(statusCode, application).headers(headersOf(response)).build();
+	}
+
+	@Override
+	public EurekaHttpResponse<InstanceInfo> getInstance(String appName, String id) {
+		return getInstanceInternal("/apps/" + appName + '/' + id);
+	}
+
+	@Override
+	public EurekaHttpResponse<InstanceInfo> getInstance(String id) {
+		return getInstanceInternal("/instances/" + id);
+	}
+
+	@Override
+	public void shutdown() {
+	}
+
+	public RestClient getRestClient() {
+		return restClient;
+	}
+
+	private EurekaHttpResponse<Applications> getApplicationsInternal(String urlPath, String[] regions) {
+		final Function<UriBuilder, URI> uriFunction = builder -> builder
+			.queryParamIfPresent("regions",
+					Optional.ofNullable(regions).filter(it -> it.length > 0).map(StringUtil::join))
+			.build();
+
+		final ResponseEntity<Applications> response = restClient.get()
+			.uri(urlPath, uriFunction)
+			.header(HttpHeaders.CONTENT_TYPE, MediaType.APPLICATION_JSON_VALUE)
+			.header(HttpHeaders.ACCEPT, MediaType.APPLICATION_JSON_VALUE)
+			.retrieve()
+			.toEntity(Applications.class);
+
+		final int statusCode = statusCodeValueOf(response);
+		final Applications body = response.getBody();
+
+		return anEurekaHttpResponse(statusCode, statusCode == HttpStatus.OK.value() && body != null ? body : null)
+			.headers(headersOf(response))
+			.build();
+	}
+
+	private EurekaHttpResponse<InstanceInfo> getInstanceInternal(String urlPath) {
+		final ResponseEntity<InstanceInfo> response = restClient.get()
+			.uri(urlPath)
+			.header(HttpHeaders.ACCEPT, MediaType.APPLICATION_JSON_VALUE)
+			.retrieve()
+			.toEntity(InstanceInfo.class);
+
+		final int statusCode = statusCodeValueOf(response);
+		final InstanceInfo body = response.getBody();
+
+		return anEurekaHttpResponse(statusCode, statusCode == HttpStatus.OK.value() && body != null ? body : null)
+			.headers(headersOf(response))
+			.build();
+	}
+
+	private static Map<String, String> headersOf(ResponseEntity<?> response) {
+		return response.getHeaders().toSingleValueMap();
+	}
+
+	private static int statusCodeValueOf(ResponseEntity<?> response) {
+		return response.getStatusCode().value();
+	}
+
+	private static EurekaHttpResponse<Void> eurekaHttpResponse(ResponseEntity<?> response) {
+		return anEurekaHttpResponse(statusCodeValueOf(response)).headers(headersOf(response)).build();
+	}
+
+}

spring-cloud-netflix-eureka-client/src/main/java/org/springframework/cloud/netflix/eureka/http/RestClientTransportClientFactories.java

@@ -0,0 +1,58 @@
+/*
+ * Copyright 2017-2024 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.cloud.netflix.eureka.http;
+
+import java.util.Collection;
+import java.util.Optional;
+
+import javax.net.ssl.HostnameVerifier;
+import javax.net.ssl.SSLContext;
+
+import com.netflix.appinfo.InstanceInfo;
+import com.netflix.discovery.EurekaClientConfig;
+import com.netflix.discovery.shared.transport.TransportClientFactory;
+import com.netflix.discovery.shared.transport.jersey.TransportClientFactories;
+
+/**
+ * @author Wonchul Heo
+ * @author Olga Maciaszek-Sharma
+ * @since 4.2.0
+ */
+public class RestClientTransportClientFactories implements TransportClientFactories<Void> {
+
+	private final RestClientDiscoveryClientOptionalArgs args;
+
+	public RestClientTransportClientFactories(RestClientDiscoveryClientOptionalArgs args) {
+		this.args = args;
+	}
+
+	@Override
+	public TransportClientFactory newTransportClientFactory(EurekaClientConfig clientConfig,
+			Collection<Void> additionalFilters, InstanceInfo myInstanceInfo) {
+		return new RestClientTransportClientFactory(args.getSSLContext(), args.getHostnameVerifier(),
+				args.getEurekaClientHttpRequestFactorySupplier(), args.getRestClientBuilderSupplier());
+	}
+
+	@Override
+	public TransportClientFactory newTransportClientFactory(final EurekaClientConfig clientConfig,
+			final Collection<Void> additionalFilters, final InstanceInfo myInstanceInfo,
+			final Optional<SSLContext> sslContext, final Optional<HostnameVerifier> hostnameVerifier) {
+		return new RestClientTransportClientFactory(args.getSSLContext(), args.getHostnameVerifier(),
+				args.getEurekaClientHttpRequestFactorySupplier(), args.getRestClientBuilderSupplier());
+	}
+
+}

spring-cloud-netflix-eureka-client/src/main/java/org/springframework/cloud/netflix/eureka/http/RestClientTransportClientFactory.java

@@ -0,0 +1,122 @@
+/*
+ * Copyright 2017-2024 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.cloud.netflix.eureka.http;
+
+import java.util.Optional;
+import java.util.function.Supplier;
+
+import javax.net.ssl.HostnameVerifier;
+import javax.net.ssl.SSLContext;
+
+import com.netflix.discovery.shared.resolver.EurekaEndpoint;
+import com.netflix.discovery.shared.transport.EurekaHttpClient;
+import com.netflix.discovery.shared.transport.TransportClientFactory;
+
+import org.springframework.cloud.configuration.TlsProperties;
+import org.springframework.http.HttpStatus;
+import org.springframework.http.HttpStatusCode;
+import org.springframework.http.client.ClientHttpRequestFactory;
+import org.springframework.http.client.ClientHttpResponse;
+import org.springframework.http.client.support.BasicAuthenticationInterceptor;
+import org.springframework.web.client.RestClient;
+import org.springframework.web.util.UriComponentsBuilder;
+
+import static org.springframework.cloud.netflix.eureka.http.EurekaHttpClientUtils.context;
+import static org.springframework.cloud.netflix.eureka.http.EurekaHttpClientUtils.extractUserInfo;
+import static org.springframework.cloud.netflix.eureka.http.EurekaHttpClientUtils.mappingJacksonHttpMessageConverter;
+
+/**
+ * Provides the custom {@link RestClient} required by the
+ * {@link RestClientEurekaHttpClient}. Relies on Jackson for serialization and
+ * deserialization.
+ *
+ * @author Wonchul Heo
+ * @author Olga Maciaszek-Sharma
+ * @since 4.2.0
+ */
+public class RestClientTransportClientFactory implements TransportClientFactory {
+
+	private final Optional<SSLContext> sslContext;
+
+	private final Optional<HostnameVerifier> hostnameVerifier;
+
+	private final EurekaClientHttpRequestFactorySupplier eurekaClientHttpRequestFactorySupplier;
+
+	private final Supplier<RestClient.Builder> builderSupplier;
+
+	public RestClientTransportClientFactory(Optional<SSLContext> sslContext,
+			Optional<HostnameVerifier> hostnameVerifier,
+			EurekaClientHttpRequestFactorySupplier eurekaClientHttpRequestFactorySupplier,
+			Supplier<RestClient.Builder> builderSupplier) {
+		this.sslContext = sslContext;
+		this.hostnameVerifier = hostnameVerifier;
+		this.eurekaClientHttpRequestFactorySupplier = eurekaClientHttpRequestFactorySupplier;
+		this.builderSupplier = builderSupplier;
+	}
+
+	public RestClientTransportClientFactory(TlsProperties tlsProperties,
+			EurekaClientHttpRequestFactorySupplier eurekaClientHttpRequestFactorySupplier,
+			Supplier<RestClient.Builder> builderSupplier) {
+		this(context(tlsProperties), Optional.empty(), eurekaClientHttpRequestFactorySupplier, builderSupplier);
+	}
+
+	public RestClientTransportClientFactory(TlsProperties tlsProperties,
+			EurekaClientHttpRequestFactorySupplier eurekaClientHttpRequestFactorySupplier) {
+		this(tlsProperties, eurekaClientHttpRequestFactorySupplier, RestClient::builder);
+	}
+
+	@Override
+	public EurekaHttpClient newClient(EurekaEndpoint endpoint) {
+		// we want a copy to modify. Don't change the original
+		final RestClient.Builder builder = builderSupplier.get().clone();
+
+		ClientHttpRequestFactory requestFactory = this.eurekaClientHttpRequestFactorySupplier
+			.get(this.sslContext.orElse(null), this.hostnameVerifier.orElse(null));
+
+		builder.requestFactory(requestFactory);
+		setUrl(builder, endpoint.getServiceUrl());
+		builder.messageConverters(converters -> converters.add(0, mappingJacksonHttpMessageConverter()));
+
+		builder.defaultStatusHandler(HttpStatusCode::isError, (req, res) -> {
+		});
+
+		builder.requestInterceptor((request, body, execution) -> {
+			final ClientHttpResponse response = execution.execute(request, body);
+			if (!response.getStatusCode().equals(HttpStatus.NOT_FOUND)) {
+				return response;
+			}
+			return new NotFoundHttpResponse(response);
+		});
+
+		return new RestClientEurekaHttpClient(builder.build());
+	}
+
+	@Override
+	public void shutdown() {
+	}
+
+	private static void setUrl(RestClient.Builder builder, String serviceUrl) {
+		final String url = UriComponentsBuilder.fromUriString(serviceUrl).userInfo(null).toUriString();
+
+		final EurekaHttpClientUtils.UserInfo userInfo = extractUserInfo(serviceUrl);
+		if (userInfo != null) {
+			builder.requestInterceptor(new BasicAuthenticationInterceptor(userInfo.username(), userInfo.password()));
+		}
+		builder.baseUrl(url);
+	}
+
+}

spring-cloud-netflix-eureka-client/src/main/java/org/springframework/cloud/netflix/eureka/http/RestTemplateDiscoveryClientOptionalArgs.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2017-2022 the original author or authors.
+ * Copyright 2017-2024 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -16,18 +16,37 @@
 
 package org.springframework.cloud.netflix.eureka.http;
 
+import java.util.function.Supplier;
+
 import com.netflix.discovery.AbstractDiscoveryClientOptionalArgs;
 
+import org.springframework.boot.web.client.RestTemplateBuilder;
+import org.springframework.web.client.RestClient;
+import org.springframework.web.client.RestTemplate;
+
 /**
  * @author Daniel Lavoie
+ * @author Armin Krezovic
+ * @deprecated {@link RestTemplate}-based implementation to be removed in favour of
+ * {@link RestClient}-based implementation.
  */
+@Deprecated
 public class RestTemplateDiscoveryClientOptionalArgs extends AbstractDiscoveryClientOptionalArgs<Void> {
 
 	protected final EurekaClientHttpRequestFactorySupplier eurekaClientHttpRequestFactorySupplier;
 
+	protected final Supplier<RestTemplateBuilder> restTemplateBuilderSupplier;
+
 	public RestTemplateDiscoveryClientOptionalArgs(
 			EurekaClientHttpRequestFactorySupplier eurekaClientHttpRequestFactorySupplier) {
+		this(eurekaClientHttpRequestFactorySupplier, RestTemplateBuilder::new);
+	}
+
+	public RestTemplateDiscoveryClientOptionalArgs(
+			EurekaClientHttpRequestFactorySupplier eurekaClientHttpRequestFactorySupplier,
+			Supplier<RestTemplateBuilder> restTemplateBuilderSupplier) {
 		this.eurekaClientHttpRequestFactorySupplier = eurekaClientHttpRequestFactorySupplier;
+		this.restTemplateBuilderSupplier = restTemplateBuilderSupplier;
 	}
 
 }

spring-cloud-netflix-eureka-client/src/main/java/org/springframework/cloud/netflix/eureka/http/RestTemplateEurekaHttpClient.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2017-2022 the original author or authors.
+ * Copyright 2017-2024 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -16,6 +16,7 @@
 
 package org.springframework.cloud.netflix.eureka.http;
 
+import java.net.URI;
 import java.util.Collections;
 import java.util.HashMap;
 import java.util.List;
@@ -37,13 +38,19 @@ import org.springframework.http.HttpMethod;
 import org.springframework.http.HttpStatus;
 import org.springframework.http.MediaType;
 import org.springframework.http.ResponseEntity;
+import org.springframework.web.client.RestClient;
 import org.springframework.web.client.RestTemplate;
+import org.springframework.web.util.UriComponentsBuilder;
 
 import static com.netflix.discovery.shared.transport.EurekaHttpResponse.anEurekaHttpResponse;
 
 /**
  * @author Daniel Lavoie
+ * @author Václav Plic
+ * @deprecated {@link RestTemplate}-based implementation to be removed in favour of
+ * {@link RestClient}-based implementation.
  */
+@Deprecated(forRemoval = true)
 public class RestTemplateEurekaHttpClient implements EurekaHttpClient {
 
 	private final RestTemplate restTemplate;
@@ -68,13 +75,16 @@ public class RestTemplateEurekaHttpClient implements EurekaHttpClient {
 
 	@Override
 	public EurekaHttpResponse<Void> register(InstanceInfo info) {
-		String urlPath = serviceUrl + "apps/" + info.getAppName();
+		URI uri = UriComponentsBuilder.fromHttpUrl(serviceUrl)
+			.path("apps/{appName}")
+			.buildAndExpand(info.getAppName())
+			.toUri();
 
 		HttpHeaders headers = new HttpHeaders();
 		headers.add(HttpHeaders.ACCEPT_ENCODING, "gzip");
 		headers.add(HttpHeaders.CONTENT_TYPE, MediaType.APPLICATION_JSON_VALUE);
 
-		ResponseEntity<Void> response = restTemplate.exchange(urlPath, HttpMethod.POST, new HttpEntity<>(info, headers),
+		ResponseEntity<Void> response = restTemplate.exchange(uri, HttpMethod.POST, new HttpEntity<>(info, headers),
 				Void.class);
 
 		return anEurekaHttpResponse(response.getStatusCode().value()).headers(headersOf(response)).build();
@@ -82,9 +92,12 @@ public class RestTemplateEurekaHttpClient implements EurekaHttpClient {
 
 	@Override
 	public EurekaHttpResponse<Void> cancel(String appName, String id) {
-		String urlPath = serviceUrl + "apps/" + appName + '/' + id;
+		URI uri = UriComponentsBuilder.fromHttpUrl(serviceUrl)
+			.path("apps/{appName}/{id}")
+			.buildAndExpand(appName, id)
+			.toUri();
 
-		ResponseEntity<Void> response = restTemplate.exchange(urlPath, HttpMethod.DELETE, null, Void.class);
+		ResponseEntity<Void> response = restTemplate.exchange(uri, HttpMethod.DELETE, null, Void.class);
 
 		return anEurekaHttpResponse(response.getStatusCode().value()).headers(headersOf(response)).build();
 	}
@@ -92,15 +105,22 @@ public class RestTemplateEurekaHttpClient implements EurekaHttpClient {
 	@Override
 	public EurekaHttpResponse<InstanceInfo> sendHeartBeat(String appName, String id, InstanceInfo info,
 			InstanceStatus overriddenStatus) {
-		String urlPath = serviceUrl + "apps/" + appName + '/' + id + "?status=" + info.getStatus().toString()
-				+ "&lastDirtyTimestamp=" + info.getLastDirtyTimestamp().toString()
-				+ (overriddenStatus != null ? "&overriddenstatus=" + overriddenStatus.name() : "");
+		UriComponentsBuilder uriBuilder = UriComponentsBuilder.fromHttpUrl(serviceUrl)
+			.path("apps/{appName}/{id}")
+			.queryParam("status", info.getStatus().toString())
+			.queryParam("lastDirtyTimestamp", info.getLastDirtyTimestamp().toString());
 
-		ResponseEntity<InstanceInfo> response = restTemplate.exchange(urlPath, HttpMethod.PUT, null,
-				InstanceInfo.class);
+		if (overriddenStatus != null) {
+			uriBuilder = uriBuilder.queryParam("overriddenstatus", overriddenStatus.name());
+		}
+
+		URI uri = uriBuilder.buildAndExpand(appName, id).toUri();
+
+		ResponseEntity<InstanceInfo> response = restTemplate.exchange(uri, HttpMethod.PUT, null, InstanceInfo.class);
 
 		EurekaHttpResponseBuilder<InstanceInfo> eurekaResponseBuilder = anEurekaHttpResponse(
-				response.getStatusCode().value(), InstanceInfo.class).headers(headersOf(response));
+				response.getStatusCode().value(), InstanceInfo.class)
+			.headers(headersOf(response));
 
 		if (response.hasBody()) {
 			eurekaResponseBuilder.entity(response.getBody());
@@ -112,20 +132,27 @@ public class RestTemplateEurekaHttpClient implements EurekaHttpClient {
 	@Override
 	public EurekaHttpResponse<Void> statusUpdate(String appName, String id, InstanceStatus newStatus,
 			InstanceInfo info) {
-		String urlPath = serviceUrl + "apps/" + appName + '/' + id + "/status?value=" + newStatus.name()
-				+ "&lastDirtyTimestamp=" + info.getLastDirtyTimestamp().toString();
+		URI uri = UriComponentsBuilder.fromHttpUrl(serviceUrl)
+			.path("apps/{appName}/{id}/status")
+			.queryParam("value", newStatus.name())
+			.queryParam("lastDirtyTimestamp", info.getLastDirtyTimestamp().toString())
+			.buildAndExpand(appName, id)
+			.toUri();
 
-		ResponseEntity<Void> response = restTemplate.exchange(urlPath, HttpMethod.PUT, null, Void.class);
+		ResponseEntity<Void> response = restTemplate.exchange(uri, HttpMethod.PUT, null, Void.class);
 
 		return anEurekaHttpResponse(response.getStatusCode().value()).headers(headersOf(response)).build();
 	}
 
 	@Override
 	public EurekaHttpResponse<Void> deleteStatusOverride(String appName, String id, InstanceInfo info) {
-		String urlPath = serviceUrl + "apps/" + appName + '/' + id + "/status?lastDirtyTimestamp="
-				+ info.getLastDirtyTimestamp().toString();
+		URI uri = UriComponentsBuilder.fromHttpUrl(serviceUrl)
+			.path("apps/{appName}/{id}/status")
+			.queryParam("lastDirtyTimestamp", info.getLastDirtyTimestamp().toString())
+			.buildAndExpand(appName, id)
+			.toUri();
 
-		ResponseEntity<Void> response = restTemplate.exchange(urlPath, HttpMethod.DELETE, null, Void.class);
+		ResponseEntity<Void> response = restTemplate.exchange(uri, HttpMethod.DELETE, null, Void.class);
 
 		return anEurekaHttpResponse(response.getStatusCode().value()).headers(headersOf(response)).build();
 	}
@@ -136,18 +163,22 @@ public class RestTemplateEurekaHttpClient implements EurekaHttpClient {
 	}
 
 	private EurekaHttpResponse<Applications> getApplicationsInternal(String urlPath, String[] regions) {
-		String url = serviceUrl + urlPath;
+		UriComponentsBuilder uriBuilder = UriComponentsBuilder.fromHttpUrl(serviceUrl).path(urlPath);
 
 		if (regions != null && regions.length > 0) {
-			url = url + (urlPath.contains("?") ? "&" : "?") + "regions=" + StringUtil.join(regions);
+			uriBuilder = uriBuilder.queryParam("regions", StringUtil.join(regions));
 		}
 
-		ResponseEntity<EurekaApplications> response = restTemplate.exchange(url, HttpMethod.GET, null,
+		URI uri = uriBuilder.build().toUri();
+
+		ResponseEntity<EurekaApplications> response = restTemplate.exchange(uri, HttpMethod.GET, null,
 				EurekaApplications.class);
 
 		return anEurekaHttpResponse(response.getStatusCode().value(),
 				response.getStatusCode().value() == HttpStatus.OK.value() && response.hasBody()
-						? (Applications) response.getBody() : null).headers(headersOf(response)).build();
+						? (Applications) response.getBody() : null)
+			.headers(headersOf(response))
+			.build();
 	}
 
 	@Override
@@ -167,9 +198,9 @@ public class RestTemplateEurekaHttpClient implements EurekaHttpClient {
 
 	@Override
 	public EurekaHttpResponse<Application> getApplication(String appName) {
-		String urlPath = serviceUrl + "apps/" + appName;
+		URI uri = UriComponentsBuilder.fromHttpUrl(serviceUrl).path("apps/{appName}").buildAndExpand(appName).toUri();
 
-		ResponseEntity<Application> response = restTemplate.exchange(urlPath, HttpMethod.GET, null, Application.class);
+		ResponseEntity<Application> response = restTemplate.exchange(uri, HttpMethod.GET, null, Application.class);
 
 		Application application = response.getStatusCode().value() == HttpStatus.OK.value() && response.hasBody()
 				? response.getBody() : null;
@@ -179,23 +210,24 @@ public class RestTemplateEurekaHttpClient implements EurekaHttpClient {
 
 	@Override
 	public EurekaHttpResponse<InstanceInfo> getInstance(String appName, String id) {
-		return getInstanceInternal("apps/" + appName + '/' + id);
+		return getInstanceInternal("apps", appName, id);
 	}
 
 	@Override
 	public EurekaHttpResponse<InstanceInfo> getInstance(String id) {
-		return getInstanceInternal("instances/" + id);
+		return getInstanceInternal("instances", id);
 	}
 
-	private EurekaHttpResponse<InstanceInfo> getInstanceInternal(String urlPath) {
-		urlPath = serviceUrl + urlPath;
+	private EurekaHttpResponse<InstanceInfo> getInstanceInternal(String... pathSegments) {
+		URI uri = UriComponentsBuilder.fromHttpUrl(serviceUrl).pathSegment(pathSegments).build().toUri();
 
-		ResponseEntity<InstanceInfo> response = restTemplate.exchange(urlPath, HttpMethod.GET, null,
-				InstanceInfo.class);
+		ResponseEntity<InstanceInfo> response = restTemplate.exchange(uri, HttpMethod.GET, null, InstanceInfo.class);
 
 		return anEurekaHttpResponse(response.getStatusCode().value(),
 				response.getStatusCode().value() == HttpStatus.OK.value() && response.hasBody() ? response.getBody()
-						: null).headers(headersOf(response)).build();
+						: null)
+			.headers(headersOf(response))
+			.build();
 	}
 
 	@Override

spring-cloud-netflix-eureka-client/src/main/java/org/springframework/cloud/netflix/eureka/http/RestTemplateTransportClientFactories.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2017-2022 the original author or authors.
+ * Copyright 2017-2024 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -27,9 +27,16 @@ import com.netflix.discovery.EurekaClientConfig;
 import com.netflix.discovery.shared.transport.TransportClientFactory;
 import com.netflix.discovery.shared.transport.jersey.TransportClientFactories;
 
+import org.springframework.web.client.RestClient;
+import org.springframework.web.client.RestTemplate;
+
 /**
  * @author Daniel Lavoie
+ * @author Armin Krezovic
+ * @deprecated {@link RestTemplate}-based implementation to be removed in favour of
+ * {@link RestClient}-based implementation.
  */
+@Deprecated(forRemoval = true)
 public class RestTemplateTransportClientFactories implements TransportClientFactories<Void> {
 
 	private final RestTemplateDiscoveryClientOptionalArgs args;
@@ -41,16 +48,16 @@ public class RestTemplateTransportClientFactories implements TransportClientFact
 	@Override
 	public TransportClientFactory newTransportClientFactory(EurekaClientConfig clientConfig,
 			Collection<Void> additionalFilters, InstanceInfo myInstanceInfo) {
-		return new RestTemplateTransportClientFactory(this.args.getSSLContext(), this.args.getHostnameVerifier(),
-				this.args.eurekaClientHttpRequestFactorySupplier);
+		return new RestTemplateTransportClientFactory(args.getSSLContext(), args.getHostnameVerifier(),
+				args.eurekaClientHttpRequestFactorySupplier, args.restTemplateBuilderSupplier);
 	}
 
 	@Override
 	public TransportClientFactory newTransportClientFactory(final EurekaClientConfig clientConfig,
 			final Collection<Void> additionalFilters, final InstanceInfo myInstanceInfo,
 			final Optional<SSLContext> sslContext, final Optional<HostnameVerifier> hostnameVerifier) {
-		return new RestTemplateTransportClientFactory(this.args.getSSLContext(), this.args.getHostnameVerifier(),
-				this.args.eurekaClientHttpRequestFactorySupplier);
+		return new RestTemplateTransportClientFactory(args.getSSLContext(), args.getHostnameVerifier(),
+				args.eurekaClientHttpRequestFactorySupplier, args.restTemplateBuilderSupplier);
 	}
 
 }

spring-cloud-netflix-eureka-client/src/main/java/org/springframework/cloud/netflix/eureka/http/RestTemplateTransportClientFactory.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2017-2022 the original author or authors.
+ * Copyright 2017-2024 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -16,54 +16,45 @@
 
 package org.springframework.cloud.netflix.eureka.http;
 
-import java.io.IOException;
-import java.io.InputStream;
-import java.net.URI;
-import java.net.URISyntaxException;
 import java.util.Optional;
+import java.util.function.Supplier;
 
 import javax.net.ssl.HostnameVerifier;
 import javax.net.ssl.SSLContext;
 
-import com.fasterxml.jackson.databind.BeanDescription;
-import com.fasterxml.jackson.databind.DeserializationFeature;
-import com.fasterxml.jackson.databind.JsonSerializer;
-import com.fasterxml.jackson.databind.ObjectMapper;
-import com.fasterxml.jackson.databind.PropertyNamingStrategies;
-import com.fasterxml.jackson.databind.SerializationConfig;
-import com.fasterxml.jackson.databind.SerializationFeature;
-import com.fasterxml.jackson.databind.module.SimpleModule;
-import com.fasterxml.jackson.databind.ser.BeanSerializerModifier;
-import com.fasterxml.jackson.databind.ser.std.BeanSerializerBase;
-import com.netflix.appinfo.InstanceInfo;
-import com.netflix.discovery.converters.jackson.mixin.ApplicationsJsonMixIn;
-import com.netflix.discovery.converters.jackson.mixin.InstanceInfoJsonMixIn;
-import com.netflix.discovery.converters.jackson.serializer.InstanceInfoJsonBeanSerializer;
-import com.netflix.discovery.shared.Applications;
 import com.netflix.discovery.shared.resolver.EurekaEndpoint;
 import com.netflix.discovery.shared.transport.EurekaHttpClient;
 import com.netflix.discovery.shared.transport.TransportClientFactory;
 
-import org.springframework.cloud.configuration.SSLContextFactory;
+import org.springframework.boot.web.client.RestTemplateBuilder;
 import org.springframework.cloud.configuration.TlsProperties;
-import org.springframework.http.HttpHeaders;
 import org.springframework.http.HttpStatus;
 import org.springframework.http.HttpStatusCode;
 import org.springframework.http.client.ClientHttpRequestFactory;
 import org.springframework.http.client.ClientHttpResponse;
 import org.springframework.http.client.support.BasicAuthenticationInterceptor;
-import org.springframework.http.converter.json.MappingJackson2HttpMessageConverter;
 import org.springframework.web.client.DefaultResponseErrorHandler;
+import org.springframework.web.client.RestClient;
 import org.springframework.web.client.RestTemplate;
 import org.springframework.web.util.UriComponentsBuilder;
 
+import static org.springframework.cloud.netflix.eureka.http.EurekaHttpClientUtils.context;
+import static org.springframework.cloud.netflix.eureka.http.EurekaHttpClientUtils.extractUserInfo;
+import static org.springframework.cloud.netflix.eureka.http.EurekaHttpClientUtils.mappingJacksonHttpMessageConverter;
+
 /**
  * Provides the custom {@link RestTemplate} required by the
  * {@link RestTemplateEurekaHttpClient}. Relies on Jackson for serialization and
  * deserialization.
  *
  * @author Daniel Lavoie
+ * @author Armin Krezovic
+ * @author Wonchul Heo
+ * @author Olga Maciaszek-Sharma
+ * @deprecated {@link RestTemplate}-based implementation to be removed in favour of
+ * {@link RestClient}-based implementation.
  */
+@Deprecated(forRemoval = true)
 public class RestTemplateTransportClientFactory implements TransportClientFactory {
 
 	private final Optional<SSLContext> sslContext;
@@ -72,37 +63,44 @@ public class RestTemplateTransportClientFactory implements TransportClientFactor
 
 	private final EurekaClientHttpRequestFactorySupplier eurekaClientHttpRequestFactorySupplier;
 
-	public RestTemplateTransportClientFactory(TlsProperties tlsProperties,
-			EurekaClientHttpRequestFactorySupplier eurekaClientHttpRequestFactorySupplier) {
-		this.sslContext = context(tlsProperties);
-		this.hostnameVerifier = Optional.empty();
+	private final Supplier<RestTemplateBuilder> restTemplateBuilderSupplier;
+
+	public RestTemplateTransportClientFactory(Optional<SSLContext> sslContext,
+			Optional<HostnameVerifier> hostnameVerifier,
+			EurekaClientHttpRequestFactorySupplier eurekaClientHttpRequestFactorySupplier,
+			Supplier<RestTemplateBuilder> restTemplateBuilderSupplier) {
+		this.sslContext = sslContext;
+		this.hostnameVerifier = hostnameVerifier;
 		this.eurekaClientHttpRequestFactorySupplier = eurekaClientHttpRequestFactorySupplier;
+		this.restTemplateBuilderSupplier = restTemplateBuilderSupplier;
 	}
 
-	private Optional<SSLContext> context(TlsProperties properties) {
-		if (properties == null || !properties.isEnabled()) {
-			return Optional.empty();
-		}
-		try {
-			return Optional.of(new SSLContextFactory(properties).createSSLContext());
-		}
-		catch (Exception e) {
-			throw new IllegalStateException(e);
-		}
+	public RestTemplateTransportClientFactory(TlsProperties tlsProperties,
+			EurekaClientHttpRequestFactorySupplier eurekaClientHttpRequestFactorySupplier,
+			Supplier<RestTemplateBuilder> restTemplateBuilderSupplier) {
+		this(context(tlsProperties), Optional.empty(), eurekaClientHttpRequestFactorySupplier,
+				restTemplateBuilderSupplier);
+	}
+
+	public RestTemplateTransportClientFactory(TlsProperties tlsProperties,
+			EurekaClientHttpRequestFactorySupplier eurekaClientHttpRequestFactorySupplier) {
+		this(tlsProperties, eurekaClientHttpRequestFactorySupplier, RestTemplateBuilder::new);
 	}
 
 	public RestTemplateTransportClientFactory(Optional<SSLContext> sslContext,
 			Optional<HostnameVerifier> hostnameVerifier,
 			EurekaClientHttpRequestFactorySupplier eurekaClientHttpRequestFactorySupplier) {
-		this.sslContext = sslContext;
-		this.hostnameVerifier = hostnameVerifier;
-		this.eurekaClientHttpRequestFactorySupplier = eurekaClientHttpRequestFactorySupplier;
+
+		this(sslContext, hostnameVerifier, eurekaClientHttpRequestFactorySupplier, RestTemplateBuilder::new);
 	}
 
+	// Visible for testing
+	/**
+	 * @deprecated pass the default values while initialising object in test classes.
+	 */
+	@Deprecated(forRemoval = true)
 	public RestTemplateTransportClientFactory() {
-		this.sslContext = Optional.empty();
-		this.hostnameVerifier = Optional.empty();
-		this.eurekaClientHttpRequestFactorySupplier = new DefaultEurekaClientHttpRequestFactorySupplier();
+		this(Optional.empty(), Optional.empty(), new DefaultEurekaClientHttpRequestFactorySupplier());
 	}
 
 	@Override
@@ -119,21 +117,25 @@ public class RestTemplateTransportClientFactory implements TransportClientFactor
 
 	private RestTemplate restTemplate(String serviceUrl) {
 		ClientHttpRequestFactory requestFactory = this.eurekaClientHttpRequestFactorySupplier
-				.get(this.sslContext.orElse(null), this.hostnameVerifier.orElse(null));
-		RestTemplate restTemplate = new RestTemplate(requestFactory);
+			.get(this.sslContext.orElse(null), this.hostnameVerifier.orElse(null));
 
-		try {
-			URI serviceURI = new URI(serviceUrl);
-			if (serviceURI.getUserInfo() != null) {
-				String[] credentials = serviceURI.getUserInfo().split(":");
-				if (credentials.length == 2) {
-					restTemplate.getInterceptors()
-							.add(new BasicAuthenticationInterceptor(credentials[0], credentials[1]));
-				}
-			}
+		RestTemplate restTemplate;
+
+		if (restTemplateBuilderSupplier != null && restTemplateBuilderSupplier.get() != null) {
+			// Avoid using RestTemplateBuilder.requestFactory(() -> requestFactory)
+			// when we have a concrete type, the reflective builder can throw errors if
+			// there is custom configuration (ie Redirects.DONT_FOLLOW) gh-4423
+			restTemplate = restTemplateBuilderSupplier.get().build();
+			restTemplate.setRequestFactory(requestFactory);
+		}
+		else {
+			restTemplate = new RestTemplate(requestFactory);
 		}
-		catch (URISyntaxException ignore) {
 
+		final EurekaHttpClientUtils.UserInfo userInfo = extractUserInfo(serviceUrl);
+		if (userInfo != null) {
+			restTemplate.getInterceptors()
+				.add(new BasicAuthenticationInterceptor(userInfo.username(), userInfo.password()));
 		}
 
 		restTemplate.getMessageConverters().add(0, mappingJacksonHttpMessageConverter());
@@ -150,102 +152,19 @@ public class RestTemplateTransportClientFactory implements TransportClientFactor
 		return restTemplate;
 	}
 
-	/**
-	 * Provides the serialization configurations required by the Eureka Server. JSON
-	 * content exchanged with eureka requires a root node matching the entity being
-	 * serialized or deserialized. Achived with
-	 * {@link SerializationFeature#WRAP_ROOT_VALUE} and
-	 * {@link DeserializationFeature#UNWRAP_ROOT_VALUE}.
-	 * {@link PropertyNamingStrategies.SnakeCaseStrategy} is applied to the underlying
-	 * {@link ObjectMapper}.
-	 * @return a {@link MappingJackson2HttpMessageConverter} object
-	 */
-	public MappingJackson2HttpMessageConverter mappingJacksonHttpMessageConverter() {
-		MappingJackson2HttpMessageConverter converter = new MappingJackson2HttpMessageConverter();
-		converter.setObjectMapper(new ObjectMapper().setPropertyNamingStrategy(PropertyNamingStrategies.SNAKE_CASE));
-
-		SimpleModule jsonModule = new SimpleModule();
-		jsonModule.setSerializerModifier(createJsonSerializerModifier());
-		converter.getObjectMapper().registerModule(jsonModule);
-
-		converter.getObjectMapper().configure(SerializationFeature.WRAP_ROOT_VALUE, true);
-		converter.getObjectMapper().configure(DeserializationFeature.UNWRAP_ROOT_VALUE, true);
-		converter.getObjectMapper().addMixIn(Applications.class, ApplicationsJsonMixIn.class);
-		converter.getObjectMapper().addMixIn(InstanceInfo.class, InstanceInfoJsonMixIn.class);
-
-		return converter;
-	}
-
-	public static BeanSerializerModifier createJsonSerializerModifier() {
-		return new BeanSerializerModifier() {
-			@Override
-			public JsonSerializer<?> modifySerializer(SerializationConfig config, BeanDescription beanDesc,
-					JsonSerializer<?> serializer) {
-				if (beanDesc.getBeanClass().isAssignableFrom(InstanceInfo.class)) {
-					return new InstanceInfoJsonBeanSerializer((BeanSerializerBase) serializer, false);
-				}
-				return serializer;
-			}
-		};
-	}
-
 	@Override
 	public void shutdown() {
 	}
 
-	/**
-	 * Response that ignores body, specifically for 404 errors.
-	 */
-	private static class NotFoundHttpResponse implements ClientHttpResponse {
-
-		private final ClientHttpResponse response;
-
-		NotFoundHttpResponse(ClientHttpResponse response) {
-			this.response = response;
-		}
-
-		@Override
-		public HttpStatusCode getStatusCode() throws IOException {
-			return response.getStatusCode();
-		}
-
-		@Override
-		public int getRawStatusCode() throws IOException {
-			return response.getRawStatusCode();
-		}
-
-		@Override
-		public String getStatusText() throws IOException {
-			return response.getStatusText();
-		}
-
-		@Override
-		public void close() {
-			response.close();
-		}
-
-		@Override
-		public InputStream getBody() throws IOException {
-			// ignore body on 404 for heartbeat, see gh-4145
-			return null;
-		}
-
-		@Override
-		public HttpHeaders getHeaders() {
-			return response.getHeaders();
-		}
-
-	}
-
 	class ErrorHandler extends DefaultResponseErrorHandler {
 
 		@Override
 		protected boolean hasError(HttpStatusCode statusCode) {
 			/**
-			 * When the Eureka server restarts and a client tries to sent a heartbeat the
-			 * server will respond with a 404. By default RestTemplate will throw an
+			 * When the Eureka server restarts and a client tries to send a heartbeat the
+			 * server will respond with a 404. By default, RestTemplate will throw an
 			 * exception in this case. What we want is to return the 404 to the upstream
-			 * code so it will send another registration request to the server.
+			 * code, so it will send another registration request to the server.
 			 */
 			if (statusCode.is4xxClientError()) {
 				return false;

spring-cloud-netflix-eureka-client/src/main/java/org/springframework/cloud/netflix/eureka/http/WebClientEurekaHttpClient.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2017-2022 the original author or authors.
+ * Copyright 2017-2024 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -17,6 +17,7 @@
 package org.springframework.cloud.netflix.eureka.http;
 
 import java.util.Map;
+import java.util.Optional;
 
 import com.netflix.appinfo.InstanceInfo;
 import com.netflix.appinfo.InstanceInfo.InstanceStatus;
@@ -42,6 +43,7 @@ import static com.netflix.discovery.shared.transport.EurekaHttpResponse.anEureka
 /**
  * @author Daniel Lavoie
  * @author Haytham Mohamed
+ * @author Václav Plic
  */
 public class WebClientEurekaHttpClient implements EurekaHttpClient {
 
@@ -53,34 +55,48 @@ public class WebClientEurekaHttpClient implements EurekaHttpClient {
 
 	@Override
 	public EurekaHttpResponse<Void> register(InstanceInfo info) {
-		return webClient.post().uri("apps/" + info.getAppName()).body(BodyInserters.fromValue(info))
-				.header(HttpHeaders.ACCEPT_ENCODING, "gzip")
-				.header(HttpHeaders.CONTENT_TYPE, MediaType.APPLICATION_JSON_VALUE).retrieve()
-				.onStatus(HttpStatusCode::isError, this::ignoreError).toBodilessEntity().map(this::eurekaHttpResponse)
-				.block();
+		return webClient.post()
+			.uri(uriBuilder -> uriBuilder.path("apps/{appName}").build(info.getAppName()))
+			.body(BodyInserters.fromValue(info))
+			.header(HttpHeaders.ACCEPT_ENCODING, "gzip")
+			.header(HttpHeaders.CONTENT_TYPE, MediaType.APPLICATION_JSON_VALUE)
+			.retrieve()
+			.onStatus(HttpStatusCode::isError, this::ignoreError)
+			.toBodilessEntity()
+			.map(this::eurekaHttpResponse)
+			.block();
 	}
 
 	@Override
 	public EurekaHttpResponse<Void> cancel(String appName, String id) {
-		return webClient.delete().uri("apps/" + appName + '/' + id).retrieve()
-				.onStatus(HttpStatusCode::isError, this::ignoreError).toBodilessEntity().map(this::eurekaHttpResponse)
-				.block();
+		return webClient.delete()
+			.uri(uriBuilder -> uriBuilder.path("apps/{appName}/{id}").build(appName, id))
+			.retrieve()
+			.onStatus(HttpStatusCode::isError, this::ignoreError)
+			.toBodilessEntity()
+			.map(this::eurekaHttpResponse)
+			.block();
 	}
 
 	@Override
 	public EurekaHttpResponse<InstanceInfo> sendHeartBeat(String appName, String id, InstanceInfo info,
 			InstanceStatus overriddenStatus) {
-		String urlPath = "apps/" + appName + '/' + id + "?status=" + info.getStatus().toString()
-				+ "&lastDirtyTimestamp=" + info.getLastDirtyTimestamp().toString()
-				+ (overriddenStatus != null ? "&overriddenstatus=" + overriddenStatus.name() : "");
 
-		ResponseEntity<InstanceInfo> response = webClient.put().uri(urlPath)
-				.header(HttpHeaders.CONTENT_TYPE, MediaType.APPLICATION_JSON_VALUE)
-				.header(HttpHeaders.ACCEPT, MediaType.APPLICATION_JSON_VALUE).retrieve()
-				.onStatus(HttpStatusCode::isError, this::ignoreError).toEntity(InstanceInfo.class).block();
+		ResponseEntity<InstanceInfo> response = webClient.put()
+			.uri(uriBuilder -> uriBuilder.path("apps/{appName}/{id}")
+				.queryParam("status", info.getStatus().toString())
+				.queryParam("lastDirtyTimestamp", info.getLastDirtyTimestamp().toString())
+				.build(appName, id))
+			.header(HttpHeaders.CONTENT_TYPE, MediaType.APPLICATION_JSON_VALUE)
+			.header(HttpHeaders.ACCEPT, MediaType.APPLICATION_JSON_VALUE)
+			.retrieve()
+			.onStatus(HttpStatusCode::isError, this::ignoreError)
+			.toEntity(InstanceInfo.class)
+			.block();
 
 		EurekaHttpResponseBuilder<InstanceInfo> builder = anEurekaHttpResponse(statusCodeValueOf(response),
-				InstanceInfo.class).headers(headersOf(response));
+				InstanceInfo.class)
+			.headers(headersOf(response));
 
 		InstanceInfo entity = response.getBody();
 
@@ -95,22 +111,31 @@ public class WebClientEurekaHttpClient implements EurekaHttpClient {
 	@Override
 	public EurekaHttpResponse<Void> statusUpdate(String appName, String id, InstanceStatus newStatus,
 			InstanceInfo info) {
-		String urlPath = "apps/" + appName + '/' + id + "/status?value=" + newStatus.name() + "&lastDirtyTimestamp="
-				+ info.getLastDirtyTimestamp().toString();
-
-		return webClient.put().uri(urlPath).header(HttpHeaders.CONTENT_TYPE, MediaType.APPLICATION_JSON_VALUE)
-				.retrieve().onStatus(HttpStatusCode::isError, this::ignoreError).toBodilessEntity()
-				.map(this::eurekaHttpResponse).block();
+		return webClient.put()
+			.uri(uriBuilder -> uriBuilder.path("apps/{appName}/{id}/status")
+				.queryParam("value", newStatus.name())
+				.queryParam("lastDirtyTimestamp", info.getLastDirtyTimestamp().toString())
+				.build(appName, id))
+			.header(HttpHeaders.CONTENT_TYPE, MediaType.APPLICATION_JSON_VALUE)
+			.retrieve()
+			.onStatus(HttpStatusCode::isError, this::ignoreError)
+			.toBodilessEntity()
+			.map(this::eurekaHttpResponse)
+			.block();
 	}
 
 	@Override
 	public EurekaHttpResponse<Void> deleteStatusOverride(String appName, String id, InstanceInfo info) {
-		String urlPath = "apps/" + appName + '/' + id + "/status?lastDirtyTimestamp="
-				+ info.getLastDirtyTimestamp().toString();
-
-		return webClient.delete().uri(urlPath).header(HttpHeaders.CONTENT_TYPE, MediaType.APPLICATION_JSON_VALUE)
-				.retrieve().onStatus(HttpStatusCode::isError, this::ignoreError).toBodilessEntity()
-				.map(this::eurekaHttpResponse).block();
+		return webClient.delete()
+			.uri(uriBuilder -> uriBuilder.path("apps/{appName}/{id}/status")
+				.queryParam("lastDirtyTimestamp", info.getLastDirtyTimestamp().toString())
+				.build(appName, id))
+			.header(HttpHeaders.CONTENT_TYPE, MediaType.APPLICATION_JSON_VALUE)
+			.retrieve()
+			.onStatus(HttpStatusCode::isError, this::ignoreError)
+			.toBodilessEntity()
+			.map(this::eurekaHttpResponse)
+			.block();
 	}
 
 	@Override
@@ -119,23 +144,25 @@ public class WebClientEurekaHttpClient implements EurekaHttpClient {
 	}
 
 	private EurekaHttpResponse<Applications> getApplicationsInternal(String urlPath, String[] regions) {
-		String url = urlPath;
+		Optional<String> regionsParam = (regions != null && regions.length > 0) ? Optional.of(StringUtil.join(regions))
+				: Optional.empty();
 
-		if (regions != null && regions.length > 0) {
-			url = url + (urlPath.contains("?") ? "&" : "?") + "regions=" + StringUtil.join(regions);
-		}
-
-		ResponseEntity<Applications> response = webClient.get().uri(url)
-				.header(HttpHeaders.CONTENT_TYPE, MediaType.APPLICATION_JSON_VALUE)
-				.header(HttpHeaders.ACCEPT, MediaType.APPLICATION_JSON_VALUE).retrieve()
-				.onStatus(HttpStatusCode::isError, this::ignoreError).toEntity(Applications.class).block();
+		ResponseEntity<Applications> response = webClient.get()
+			.uri(uriBuilder -> uriBuilder.path(urlPath).queryParamIfPresent("regions", regionsParam).build())
+			.header(HttpHeaders.CONTENT_TYPE, MediaType.APPLICATION_JSON_VALUE)
+			.header(HttpHeaders.ACCEPT, MediaType.APPLICATION_JSON_VALUE)
+			.retrieve()
+			.onStatus(HttpStatusCode::isError, this::ignoreError)
+			.toEntity(Applications.class)
+			.block();
 
 		int statusCode = statusCodeValueOf(response);
 
 		Applications body = response.getBody();
 
 		return anEurekaHttpResponse(statusCode, statusCode == HttpStatus.OK.value() && body != null ? body : null)
-				.headers(headersOf(response)).build();
+			.headers(headersOf(response))
+			.build();
 	}
 
 	@Override
@@ -156,9 +183,13 @@ public class WebClientEurekaHttpClient implements EurekaHttpClient {
 	@Override
 	public EurekaHttpResponse<Application> getApplication(String appName) {
 
-		ResponseEntity<Application> response = webClient.get().uri("apps/" + appName)
-				.header(HttpHeaders.ACCEPT, MediaType.APPLICATION_JSON_VALUE).retrieve()
-				.onStatus(HttpStatusCode::isError, this::ignoreError).toEntity(Application.class).block();
+		ResponseEntity<Application> response = webClient.get()
+			.uri(uriBuilder -> uriBuilder.path("apps/{appName}").build(appName))
+			.header(HttpHeaders.ACCEPT, MediaType.APPLICATION_JSON_VALUE)
+			.retrieve()
+			.onStatus(HttpStatusCode::isError, this::ignoreError)
+			.toEntity(Application.class)
+			.block();
 
 		int statusCode = statusCodeValueOf(response);
 		Application body = response.getBody();
@@ -170,24 +201,29 @@ public class WebClientEurekaHttpClient implements EurekaHttpClient {
 
 	@Override
 	public EurekaHttpResponse<InstanceInfo> getInstance(String appName, String id) {
-		return getInstanceInternal("apps/" + appName + '/' + id);
+		return getInstanceInternal("apps", appName, id);
 	}
 
 	@Override
 	public EurekaHttpResponse<InstanceInfo> getInstance(String id) {
-		return getInstanceInternal("instances/" + id);
+		return getInstanceInternal("instances", id);
 	}
 
-	private EurekaHttpResponse<InstanceInfo> getInstanceInternal(String urlPath) {
-		ResponseEntity<InstanceInfo> response = webClient.get().uri(urlPath)
-				.header(HttpHeaders.ACCEPT, MediaType.APPLICATION_JSON_VALUE).retrieve()
-				.onStatus(HttpStatusCode::isError, this::ignoreError).toEntity(InstanceInfo.class).block();
+	private EurekaHttpResponse<InstanceInfo> getInstanceInternal(String... pathSegments) {
+		ResponseEntity<InstanceInfo> response = webClient.get()
+			.uri(uriBuilder -> uriBuilder.pathSegment(pathSegments).build())
+			.header(HttpHeaders.ACCEPT, MediaType.APPLICATION_JSON_VALUE)
+			.retrieve()
+			.onStatus(HttpStatusCode::isError, this::ignoreError)
+			.toEntity(InstanceInfo.class)
+			.block();
 
 		int statusCode = statusCodeValueOf(response);
 		InstanceInfo body = response.getBody();
 
 		return anEurekaHttpResponse(statusCode, statusCode == HttpStatus.OK.value() && body != null ? body : null)
-				.headers(headersOf(response)).build();
+			.headers(headersOf(response))
+			.build();
 	}
 
 	@Override

spring-cloud-netflix-eureka-client/src/main/java/org/springframework/cloud/netflix/eureka/http/WebClientTransportClientFactory.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2017-2022 the original author or authors.
+ * Copyright 2017-2024 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -16,25 +16,9 @@
 
 package org.springframework.cloud.netflix.eureka.http;
 
-import java.net.URI;
-import java.net.URISyntaxException;
 import java.util.function.Supplier;
 
-import com.fasterxml.jackson.databind.BeanDescription;
-import com.fasterxml.jackson.databind.DeserializationFeature;
-import com.fasterxml.jackson.databind.JsonSerializer;
 import com.fasterxml.jackson.databind.ObjectMapper;
-import com.fasterxml.jackson.databind.PropertyNamingStrategies;
-import com.fasterxml.jackson.databind.SerializationConfig;
-import com.fasterxml.jackson.databind.SerializationFeature;
-import com.fasterxml.jackson.databind.module.SimpleModule;
-import com.fasterxml.jackson.databind.ser.BeanSerializerModifier;
-import com.fasterxml.jackson.databind.ser.std.BeanSerializerBase;
-import com.netflix.appinfo.InstanceInfo;
-import com.netflix.discovery.converters.jackson.mixin.ApplicationsJsonMixIn;
-import com.netflix.discovery.converters.jackson.mixin.InstanceInfoJsonMixIn;
-import com.netflix.discovery.converters.jackson.serializer.InstanceInfoJsonBeanSerializer;
-import com.netflix.discovery.shared.Applications;
 import com.netflix.discovery.shared.resolver.EurekaEndpoint;
 import com.netflix.discovery.shared.transport.EurekaHttpClient;
 import com.netflix.discovery.shared.transport.TransportClientFactory;
@@ -50,6 +34,10 @@ import org.springframework.web.reactive.function.client.ClientResponse;
 import org.springframework.web.reactive.function.client.ExchangeFilterFunction;
 import org.springframework.web.reactive.function.client.ExchangeFilterFunctions;
 import org.springframework.web.reactive.function.client.WebClient;
+import org.springframework.web.util.UriComponentsBuilder;
+
+import static org.springframework.cloud.netflix.eureka.http.EurekaHttpClientUtils.extractUserInfo;
+import static org.springframework.cloud.netflix.eureka.http.EurekaHttpClientUtils.objectMapper;
 
 /**
  * Provides the custom {@link WebClient.Builder} required by the
@@ -58,6 +46,8 @@ import org.springframework.web.reactive.function.client.WebClient;
  *
  * @author Daniel Lavoie
  * @author Haytham Mohamed
+ * @author Armin Krezovic
+ * @author Wonchul Heo
  */
 public class WebClientTransportClientFactory implements TransportClientFactory {
 
@@ -78,35 +68,15 @@ public class WebClientTransportClientFactory implements TransportClientFactory {
 	}
 
 	private WebClient.Builder setUrl(WebClient.Builder builder, String serviceUrl) {
-		String url = serviceUrl;
-		try {
-			URI serviceURI = new URI(serviceUrl);
-			if (serviceURI.getUserInfo() != null) {
-				String[] credentials = serviceURI.getUserInfo().split(":");
-				if (credentials.length == 2) {
-					builder.filter(ExchangeFilterFunctions.basicAuthentication(credentials[0], credentials[1]));
-					url = serviceUrl.replace(credentials[0] + ":" + credentials[1] + "@", "");
-				}
-			}
-		}
-		catch (URISyntaxException ignore) {
+		String url = UriComponentsBuilder.fromUriString(serviceUrl).userInfo(null).toUriString();
+
+		final EurekaHttpClientUtils.UserInfo userInfo = extractUserInfo(serviceUrl);
+		if (userInfo != null) {
+			builder.filter(ExchangeFilterFunctions.basicAuthentication(userInfo.username(), userInfo.password()));
 		}
 		return builder.baseUrl(url);
 	}
 
-	private static BeanSerializerModifier createJsonSerializerModifier() {
-		return new BeanSerializerModifier() {
-			@Override
-			public JsonSerializer<?> modifySerializer(SerializationConfig config, BeanDescription beanDesc,
-					JsonSerializer<?> serializer) {
-				if (beanDesc.getBeanClass().isAssignableFrom(InstanceInfo.class)) {
-					return new InstanceInfoJsonBeanSerializer((BeanSerializerBase) serializer, false);
-				}
-				return serializer;
-			}
-		};
-	}
-
 	private void setCodecs(WebClient.Builder builder) {
 		ObjectMapper objectMapper = objectMapper();
 		builder.codecs(configurer -> {
@@ -117,32 +87,6 @@ public class WebClientTransportClientFactory implements TransportClientFactory {
 		});
 	}
 
-	/**
-	 * Provides the serialization configurations required by the Eureka Server. JSON
-	 * content exchanged with eureka requires a root node matching the entity being
-	 * serialized or deserialized. Achieved with
-	 * {@link SerializationFeature#WRAP_ROOT_VALUE} and
-	 * {@link DeserializationFeature#UNWRAP_ROOT_VALUE}.
-	 * {@link PropertyNamingStrategies.SnakeCaseStrategy} is applied to the underlying
-	 * {@link ObjectMapper}.
-	 * @return a {@link ObjectMapper} object
-	 */
-	private ObjectMapper objectMapper() {
-		ObjectMapper objectMapper = new ObjectMapper();
-		objectMapper.setPropertyNamingStrategy(PropertyNamingStrategies.SNAKE_CASE);
-
-		SimpleModule jsonModule = new SimpleModule();
-		jsonModule.setSerializerModifier(createJsonSerializerModifier());
-		objectMapper.registerModule(jsonModule);
-
-		objectMapper.configure(SerializationFeature.WRAP_ROOT_VALUE, true);
-		objectMapper.configure(DeserializationFeature.UNWRAP_ROOT_VALUE, true);
-		objectMapper.addMixIn(Applications.class, ApplicationsJsonMixIn.class);
-		objectMapper.addMixIn(InstanceInfo.class, InstanceInfoJsonMixIn.class);
-
-		return objectMapper;
-	}
-
 	// Skip over 4xx http errors
 	private ExchangeFilterFunction http4XxErrorExchangeFilterFunction() {
 		return ExchangeFilterFunction.ofResponseProcessor(clientResponse -> {
@@ -153,9 +97,11 @@ public class WebClientTransportClientFactory implements TransportClientFactory {
 				return Mono.just(newResponse);
 			}
 			if (clientResponse.statusCode().equals(HttpStatus.NOT_FOUND)) {
-				ClientResponse newResponse = clientResponse.mutate().statusCode(clientResponse.statusCode())
-						// ignore body on 404 for heartbeat, see gh-4145
-						.body(Flux.empty()).build();
+				ClientResponse newResponse = clientResponse.mutate()
+					.statusCode(clientResponse.statusCode())
+					// ignore body on 404 for heartbeat, see gh-4145
+					.body(Flux.empty())
+					.build();
 				return Mono.just(newResponse);
 			}
 			return Mono.just(clientResponse);

spring-cloud-netflix-eureka-client/src/main/java/org/springframework/cloud/netflix/eureka/reactive/EurekaReactiveDiscoveryClient.java

@@ -52,15 +52,16 @@ public class EurekaReactiveDiscoveryClient implements ReactiveDiscoveryClient {
 	@Override
 	public Flux<ServiceInstance> getInstances(String serviceId) {
 		return Flux.defer(() -> Flux.fromIterable(eurekaClient.getInstancesByVipAddress(serviceId, false)))
-				.map(EurekaServiceInstance::new);
+			.map(EurekaServiceInstance::new);
 	}
 
 	@Override
 	public Flux<String> getServices() {
 		return Flux.defer(() -> Mono.justOrEmpty(eurekaClient.getApplications()))
-				.flatMapIterable(Applications::getRegisteredApplications)
-				.filter(application -> !application.getInstances().isEmpty()).map(Application::getName)
-				.map(String::toLowerCase);
+			.flatMapIterable(Applications::getRegisteredApplications)
+			.filter(application -> !application.getInstances().isEmpty())
+			.map(Application::getName)
+			.map(String::toLowerCase);
 	}
 
 	@Override

spring-cloud-netflix-eureka-client/src/main/java/org/springframework/cloud/netflix/eureka/serviceregistry/EurekaServiceRegistry.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2013-2022 the original author or authors.
+ * Copyright 2013-2024 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -17,25 +17,54 @@
 package org.springframework.cloud.netflix.eureka.serviceregistry;
 
 import java.util.HashMap;
+import java.util.concurrent.ExecutorService;
+import java.util.concurrent.Executors;
 
 import com.netflix.appinfo.InstanceInfo;
 import org.apache.commons.logging.Log;
 import org.apache.commons.logging.LogFactory;
 
 import org.springframework.cloud.client.serviceregistry.ServiceRegistry;
+import org.springframework.cloud.netflix.eureka.EurekaInstanceConfigBean;
 
 import static com.netflix.appinfo.InstanceInfo.InstanceStatus.UNKNOWN;
 
 /**
  * @author Spencer Gibb
+ * @author Robert Bleyl
  */
 public class EurekaServiceRegistry implements ServiceRegistry<EurekaRegistration> {
 
 	private static final Log log = LogFactory.getLog(EurekaServiceRegistry.class);
 
+	private EurekaInstanceConfigBean eurekaInstanceConfigBean;
+
+	public EurekaServiceRegistry() {
+
+	}
+
+	public EurekaServiceRegistry(EurekaInstanceConfigBean eurekaInstanceConfigBean) {
+		this.eurekaInstanceConfigBean = eurekaInstanceConfigBean;
+	}
+
 	@Override
 	public void register(EurekaRegistration reg) {
-		maybeInitializeClient(reg);
+		if (eurekaInstanceConfigBean != null && eurekaInstanceConfigBean.isAsyncClientInitialization()) {
+			if (log.isDebugEnabled()) {
+				log.debug("Initializing client asynchronously...");
+			}
+
+			ExecutorService executorService = Executors.newSingleThreadExecutor();
+			executorService.submit(() -> {
+				maybeInitializeClient(reg);
+				if (log.isDebugEnabled()) {
+					log.debug("Asynchronous client initialization done.");
+				}
+			});
+		}
+		else {
+			maybeInitializeClient(reg);
+		}
 
 		if (log.isInfoEnabled()) {
 			log.info("Registering application " + reg.getApplicationInfoManager().getInfo().getAppName()
@@ -45,7 +74,7 @@ public class EurekaServiceRegistry implements ServiceRegistry<EurekaRegistration
 		reg.getApplicationInfoManager().setInstanceStatus(reg.getInstanceConfig().getInitialStatus());
 
 		reg.getHealthCheckHandler()
-				.ifAvailable(healthCheckHandler -> reg.getEurekaClient().registerHealthCheck(healthCheckHandler));
+			.ifAvailable(healthCheckHandler -> reg.getEurekaClient().registerHealthCheck(healthCheckHandler));
 	}
 
 	private void maybeInitializeClient(EurekaRegistration reg) {

spring-cloud-netflix-eureka-client/src/main/resources/META-INF/additional-spring-configuration-metadata.json

@@ -12,12 +12,24 @@
       "description": "Determines whether the EurekaClient instance can be refreshed or not(If disabled none of the Eureka client properties will be refreshable).",
       "type": "java.lang.Boolean"
     },
+    {
+      "defaultValue": false,
+      "name": "eureka.client.restclient.enabled",
+      "description": "Enables the use of RestClient for Eureka HTTP Client.",
+      "type": "java.lang.Boolean"
+    },
     {
       "defaultValue": false,
       "name": "eureka.client.webclient.enabled",
       "description": "Enables the use of WebClient for Eureka HTTP Client.",
       "type": "java.lang.Boolean"
     },
+    {
+      "defaultValue": true,
+      "name": "eureka.client.jersey.enabled",
+      "description": "Enables the use of JerseyClient for Eureka HTTP Client.",
+      "type": "java.lang.Boolean"
+    },
     {
       "defaultValue": 1,
       "name": "eureka.instance.metadata-map.weight",

spring-cloud-netflix-eureka-client/src/test/java/org/springframework/cloud/netflix/eureka/ConditionalOnRefreshScopeTests.java

@@ -37,20 +37,23 @@ class ConditionalOnRefreshScopeTests {
 	@Test
 	void refreshScopeIncluded() {
 		new ApplicationContextRunner().withConfiguration(AutoConfigurations.of(RefreshAutoConfiguration.class))
-				.withUserConfiguration(Beans.class).run(c -> {
-					assertThat(c).hasSingleBean(org.springframework.cloud.context.scope.refresh.RefreshScope.class);
-					assertThat(c.getBean("foo")).isEqualTo("foo");
-				});
+			.withUserConfiguration(Beans.class)
+			.run(c -> {
+				assertThat(c).hasSingleBean(org.springframework.cloud.context.scope.refresh.RefreshScope.class);
+				assertThat(c.getBean("foo")).isEqualTo("foo");
+			});
 	}
 
 	@Test
 	void refreshScopeIncludedAndPropertyDisabled() {
 		new ApplicationContextRunner().withConfiguration(AutoConfigurations.of(RefreshAutoConfiguration.class))
-				.withPropertyValues("eureka.client.refresh.enable=false").withUserConfiguration(Beans.class).run(c -> {
-					assertThat(c).hasSingleBean(org.springframework.cloud.context.scope.refresh.RefreshScope.class);
-					assertThat(c).doesNotHaveBean("foo");
-					assertThat(c.getBean("bar")).isEqualTo("bar");
-				});
+			.withPropertyValues("eureka.client.refresh.enable=false")
+			.withUserConfiguration(Beans.class)
+			.run(c -> {
+				assertThat(c).hasSingleBean(org.springframework.cloud.context.scope.refresh.RefreshScope.class);
+				assertThat(c).doesNotHaveBean("foo");
+				assertThat(c.getBean("bar")).isEqualTo("bar");
+			});
 	}
 
 	@Test
@@ -61,10 +64,11 @@ class ConditionalOnRefreshScopeTests {
 		});
 
 		new ApplicationContextRunner().withUserConfiguration(Beans.class)
-				.withPropertyValues("eureka.client.refresh.enable=false").run(c -> {
-					assertThat(c).doesNotHaveBean("foo");
-					assertThat(c.getBean("bar")).isEqualTo("bar");
-				});
+			.withPropertyValues("eureka.client.refresh.enable=false")
+			.run(c -> {
+				assertThat(c).doesNotHaveBean("foo");
+				assertThat(c.getBean("bar")).isEqualTo("bar");
+			});
 	}
 
 	@Configuration(proxyBeanMethods = false)

spring-cloud-netflix-eureka-client/src/test/java/org/springframework/cloud/netflix/eureka/EurekaClientAutoConfigurationTests.java

@@ -118,7 +118,7 @@ class EurekaClientAutoConfigurationTests {
 	@Test
 	void shouldSetManagementAndJmxPortsInMetadataMap() {
 		TestPropertyValues.of("management.server.port=9999", "com.sun.management.jmxremote.port=6789")
-				.applyTo(this.context);
+			.applyTo(this.context);
 		setupContext(RefreshAutoConfiguration.class);
 
 		EurekaInstanceConfigBean instance = this.context.getBean(EurekaInstanceConfigBean.class);
@@ -128,8 +128,10 @@ class EurekaClientAutoConfigurationTests {
 
 	@Test
 	void shouldNotResetManagementAndJmxPortsInMetadataMap() {
-		TestPropertyValues.of("management.server.port=9999", "eureka.instance.metadata-map.jmx.port=9898",
-				"eureka.instance.metadata-map.management.port=7878").applyTo(this.context);
+		TestPropertyValues
+			.of("management.server.port=9999", "eureka.instance.metadata-map.jmx.port=9898",
+					"eureka.instance.metadata-map.management.port=7878")
+			.applyTo(this.context);
 		setupContext(RefreshAutoConfiguration.class);
 
 		EurekaInstanceConfigBean instance = this.context.getBean(EurekaInstanceConfigBean.class);
@@ -178,112 +180,128 @@ class EurekaClientAutoConfigurationTests {
 		setupContext(RefreshAutoConfiguration.class);
 		EurekaInstanceConfigBean instance = this.context.getBean(EurekaInstanceConfigBean.class);
 		assertThat(instance.getStatusPageUrl().contains("9999")).as("Wrong status page: " + instance.getStatusPageUrl())
-				.isTrue();
+			.isTrue();
 	}
 
 	@Test
 	void statusPageUrlPathAndManagementPort() {
-		TestPropertyValues.of("server.port=8989", "management.server.port=9999",
-				"eureka.instance.statusPageUrlPath=/myStatusPage").applyTo(this.context);
+		TestPropertyValues
+			.of("server.port=8989", "management.server.port=9999", "eureka.instance.statusPageUrlPath=/myStatusPage")
+			.applyTo(this.context);
 		setupContext(RefreshAutoConfiguration.class);
 		EurekaInstanceConfigBean instance = this.context.getBean(EurekaInstanceConfigBean.class);
 		assertThat(instance.getStatusPageUrl().contains("/myStatusPage"))
-				.as("Wrong status page: " + instance.getStatusPageUrl()).isTrue();
+			.as("Wrong status page: " + instance.getStatusPageUrl())
+			.isTrue();
 	}
 
 	@Test
 	void healthCheckUrlPathAndManagementPort() {
-		TestPropertyValues.of("server.port=8989", "management.server.port=9999",
-				"eureka.instance.healthCheckUrlPath=/myHealthCheck").applyTo(this.context);
+		TestPropertyValues
+			.of("server.port=8989", "management.server.port=9999", "eureka.instance.healthCheckUrlPath=/myHealthCheck")
+			.applyTo(this.context);
 		setupContext(RefreshAutoConfiguration.class);
 		EurekaInstanceConfigBean instance = this.context.getBean(EurekaInstanceConfigBean.class);
 		assertThat(instance.getHealthCheckUrl().contains("/myHealthCheck"))
-				.as("Wrong health check: " + instance.getHealthCheckUrl()).isTrue();
+			.as("Wrong health check: " + instance.getHealthCheckUrl())
+			.isTrue();
 	}
 
 	@Test
 	void statusPageUrl_and_healthCheckUrl_do_not_contain_server_context_path() {
 		TestPropertyValues.of("server.port=8989", "management.server.port=9999", "server.contextPath=/service")
-				.applyTo(this.context);
+			.applyTo(this.context);
 
 		setupContext(RefreshAutoConfiguration.class);
 		EurekaInstanceConfigBean instance = this.context.getBean(EurekaInstanceConfigBean.class);
 		assertThat(instance.getStatusPageUrl().endsWith(":9999/actuator/info"))
-				.as("Wrong status page: " + instance.getStatusPageUrl()).isTrue();
+			.as("Wrong status page: " + instance.getStatusPageUrl())
+			.isTrue();
 		assertThat(instance.getHealthCheckUrl().endsWith(":9999/actuator/health"))
-				.as("Wrong health check: " + instance.getHealthCheckUrl()).isTrue();
+			.as("Wrong health check: " + instance.getHealthCheckUrl())
+			.isTrue();
 	}
 
 	@Test
 	void statusPageUrl_and_healthCheckUrl_contain_management_context_path() {
 		TestPropertyValues.of("server.port=8989", "management.server.servlet.context-path=/management")
-				.applyTo(this.context);
+			.applyTo(this.context);
 
 		setupContext(RefreshAutoConfiguration.class);
 		EurekaInstanceConfigBean instance = this.context.getBean(EurekaInstanceConfigBean.class);
 		assertThat(instance.getStatusPageUrl().endsWith(":8989/management/actuator/info"))
-				.as("Wrong status page: " + instance.getStatusPageUrl()).isTrue();
+			.as("Wrong status page: " + instance.getStatusPageUrl())
+			.isTrue();
 		assertThat(instance.getHealthCheckUrl().endsWith(":8989/management/actuator/health"))
-				.as("Wrong health check: " + instance.getHealthCheckUrl()).isTrue();
+			.as("Wrong health check: " + instance.getHealthCheckUrl())
+			.isTrue();
 	}
 
 	@Test
 	void statusPageUrl_and_healthCheckUrl_contain_management_context_path_random_port() {
 		TestPropertyValues.of("server.port=0", "management.server.servlet.context-path=/management")
-				.applyTo(this.context);
+			.applyTo(this.context);
 
 		setupContext(RefreshAutoConfiguration.class);
 		EurekaInstanceConfigBean instance = this.context.getBean(EurekaInstanceConfigBean.class);
 		assertThat(instance.getStatusPageUrlPath().equals("/management/actuator/info"))
-				.as("Wrong status page: " + instance.getStatusPageUrlPath()).isTrue();
+			.as("Wrong status page: " + instance.getStatusPageUrlPath())
+			.isTrue();
 		assertThat(instance.getHealthCheckUrlPath().equals("/management/actuator/health"))
-				.as("Wrong health check: " + instance.getHealthCheckUrlPath()).isTrue();
+			.as("Wrong health check: " + instance.getHealthCheckUrlPath())
+			.isTrue();
 	}
 
 	@Test
 	void statusPageUrlPathAndManagementPortAndContextPath() {
-		TestPropertyValues.of("server.port=8989", "management.server.port=9999",
-				"management.server.servlet.context-path=/manage", "eureka.instance.status-page-url-path=/myStatusPage")
-				.applyTo(this.context);
+		TestPropertyValues
+			.of("server.port=8989", "management.server.port=9999", "management.server.servlet.context-path=/manage",
+					"eureka.instance.status-page-url-path=/myStatusPage")
+			.applyTo(this.context);
 		setupContext(RefreshAutoConfiguration.class);
 		EurekaInstanceConfigBean instance = this.context.getBean(EurekaInstanceConfigBean.class);
 		assertThat(instance.getStatusPageUrl().endsWith(":9999/manage/myStatusPage"))
-				.as("Wrong status page: " + instance.getStatusPageUrl()).isTrue();
+			.as("Wrong status page: " + instance.getStatusPageUrl())
+			.isTrue();
 	}
 
 	@Test
 	void healthCheckUrlPathAndManagementPortAndContextPath() {
 		TestPropertyValues
-				.of("server.port=8989", "management.server.port=9999", "management.server.servlet.context-path=/manage",
-						"eureka.instance.health-check-url-path=/myHealthCheck")
-				.applyTo(this.context);
+			.of("server.port=8989", "management.server.port=9999", "management.server.servlet.context-path=/manage",
+					"eureka.instance.health-check-url-path=/myHealthCheck")
+			.applyTo(this.context);
 		setupContext(RefreshAutoConfiguration.class);
 		EurekaInstanceConfigBean instance = this.context.getBean(EurekaInstanceConfigBean.class);
 		assertThat(instance.getHealthCheckUrl().endsWith(":9999/manage/myHealthCheck"))
-				.as("Wrong health check: " + instance.getHealthCheckUrl()).isTrue();
+			.as("Wrong health check: " + instance.getHealthCheckUrl())
+			.isTrue();
 	}
 
 	@Test
 	void statusPageUrlPathAndManagementPortAndContextPathKebobCase() {
-		TestPropertyValues.of("server.port=8989", "management.server.port=9999",
-				"management.server.servlet.context-path=/manage", "eureka.instance.status-page-url-path=/myStatusPage")
-				.applyTo(this.context);
+		TestPropertyValues
+			.of("server.port=8989", "management.server.port=9999", "management.server.servlet.context-path=/manage",
+					"eureka.instance.status-page-url-path=/myStatusPage")
+			.applyTo(this.context);
 		setupContext(RefreshAutoConfiguration.class);
 		EurekaInstanceConfigBean instance = this.context.getBean(EurekaInstanceConfigBean.class);
 		assertThat(instance.getStatusPageUrl().endsWith(":9999/manage/myStatusPage"))
-				.as("Wrong status page: " + instance.getStatusPageUrl()).isTrue();
+			.as("Wrong status page: " + instance.getStatusPageUrl())
+			.isTrue();
 	}
 
 	@Test
 	void healthCheckUrlPathAndManagementPortAndContextPathKebobCase() {
 		TestPropertyValues
-				.of("server.port=8989", "management.server.port=9999", "management.server.servlet.context-path=/manage",
-						"eureka.instance.health-check-url-path=/myHealthCheck")
-				.applyTo(this.context);
+			.of("server.port=8989", "management.server.port=9999", "management.server.servlet.context-path=/manage",
+					"eureka.instance.health-check-url-path=/myHealthCheck")
+			.applyTo(this.context);
 		setupContext(RefreshAutoConfiguration.class);
 		EurekaInstanceConfigBean instance = this.context.getBean(EurekaInstanceConfigBean.class);
 		assertThat(instance.getHealthCheckUrl().endsWith(":9999/manage/myHealthCheck"))
-				.as("Wrong health check: " + instance.getHealthCheckUrl()).isTrue();
+			.as("Wrong health check: " + instance.getHealthCheckUrl())
+			.isTrue();
 	}
 
 	@Test
@@ -293,9 +311,11 @@ class EurekaClientAutoConfigurationTests {
 		setupContext(RefreshAutoConfiguration.class);
 		EurekaInstanceConfigBean instance = this.context.getBean(EurekaInstanceConfigBean.class);
 		assertThat(instance.getStatusPageUrl().endsWith(":8989/management/actuator/info"))
-				.as("Wrong status page: " + instance.getStatusPageUrl()).isTrue();
+			.as("Wrong status page: " + instance.getStatusPageUrl())
+			.isTrue();
 		assertThat(instance.getHealthCheckUrl().endsWith(":8989/management/actuator/health"))
-				.as("Wrong health check: " + instance.getHealthCheckUrl()).isTrue();
+			.as("Wrong health check: " + instance.getHealthCheckUrl())
+			.isTrue();
 	}
 
 	@Test
@@ -305,111 +325,132 @@ class EurekaClientAutoConfigurationTests {
 		setupContext(RefreshAutoConfiguration.class);
 		EurekaInstanceConfigBean instance = this.context.getBean(EurekaInstanceConfigBean.class);
 		assertThat(instance.getStatusPageUrlPath().equals("/management/actuator/info"))
-				.as("Wrong status page: " + instance.getStatusPageUrlPath()).isTrue();
+			.as("Wrong status page: " + instance.getStatusPageUrlPath())
+			.isTrue();
 		assertThat(instance.getHealthCheckUrlPath().equals("/management/actuator/health"))
-				.as("Wrong health check: " + instance.getHealthCheckUrlPath()).isTrue();
+			.as("Wrong health check: " + instance.getHealthCheckUrlPath())
+			.isTrue();
 	}
 
 	@Test
 	void statusPageUrlPathAndManagementPortAndBasePath() {
-		TestPropertyValues.of("server.port=8989", "management.server.port=9999", "management.server.base-path=/manage",
-				"eureka.instance.status-page-url-path=/myStatusPage").applyTo(this.context);
+		TestPropertyValues
+			.of("server.port=8989", "management.server.port=9999", "management.server.base-path=/manage",
+					"eureka.instance.status-page-url-path=/myStatusPage")
+			.applyTo(this.context);
 		setupContext(RefreshAutoConfiguration.class);
 		EurekaInstanceConfigBean instance = this.context.getBean(EurekaInstanceConfigBean.class);
 		assertThat(instance.getStatusPageUrl().endsWith(":9999/manage/myStatusPage"))
-				.as("Wrong status page: " + instance.getStatusPageUrl()).isTrue();
+			.as("Wrong status page: " + instance.getStatusPageUrl())
+			.isTrue();
 	}
 
 	@Test
 	void healthCheckUrlPathAndManagementPortAndBasePath() {
-		TestPropertyValues.of("server.port=8989", "management.server.port=9999", "management.server.base-path=/manage",
-				"eureka.instance.health-check-url-path=/myHealthCheck").applyTo(this.context);
+		TestPropertyValues
+			.of("server.port=8989", "management.server.port=9999", "management.server.base-path=/manage",
+					"eureka.instance.health-check-url-path=/myHealthCheck")
+			.applyTo(this.context);
 		setupContext(RefreshAutoConfiguration.class);
 		EurekaInstanceConfigBean instance = this.context.getBean(EurekaInstanceConfigBean.class);
 		assertThat(instance.getHealthCheckUrl().endsWith(":9999/manage/myHealthCheck"))
-				.as("Wrong health check: " + instance.getHealthCheckUrl()).isTrue();
+			.as("Wrong health check: " + instance.getHealthCheckUrl())
+			.isTrue();
 	}
 
 	@Test
 	void statusPageUrlPathAndManagementPortAndBasePathKebobCase() {
-		TestPropertyValues.of("server.port=8989", "management.server.port=9999", "management.server.base-path=/manage",
-				"eureka.instance.status-page-url-path=/myStatusPage").applyTo(this.context);
+		TestPropertyValues
+			.of("server.port=8989", "management.server.port=9999", "management.server.base-path=/manage",
+					"eureka.instance.status-page-url-path=/myStatusPage")
+			.applyTo(this.context);
 		setupContext(RefreshAutoConfiguration.class);
 		EurekaInstanceConfigBean instance = this.context.getBean(EurekaInstanceConfigBean.class);
 		assertThat(instance.getStatusPageUrl().endsWith(":9999/manage/myStatusPage"))
-				.as("Wrong status page: " + instance.getStatusPageUrl()).isTrue();
+			.as("Wrong status page: " + instance.getStatusPageUrl())
+			.isTrue();
 	}
 
 	@Test
 	void healthCheckUrlPathAndManagementPortAndBasePathKebobCase() {
-		TestPropertyValues.of("server.port=8989", "management.server.port=9999", "management.server.base-path=/manage",
-				"eureka.instance.health-check-url-path=/myHealthCheck").applyTo(this.context);
+		TestPropertyValues
+			.of("server.port=8989", "management.server.port=9999", "management.server.base-path=/manage",
+					"eureka.instance.health-check-url-path=/myHealthCheck")
+			.applyTo(this.context);
 		setupContext(RefreshAutoConfiguration.class);
 		EurekaInstanceConfigBean instance = this.context.getBean(EurekaInstanceConfigBean.class);
 		assertThat(instance.getHealthCheckUrl().endsWith(":9999/manage/myHealthCheck"))
-				.as("Wrong health check: " + instance.getHealthCheckUrl()).isTrue();
+			.as("Wrong health check: " + instance.getHealthCheckUrl())
+			.isTrue();
 	}
 
 	@Test
 	void healthCheckUrlPathWithServerPortAndContextPathKebobCase() {
 		TestPropertyValues
-				.of("server.port=8989", "server.servlet.context-path=/servletContextPath",
-						"eureka.instance.health-check-url-path=${server.servlet.context-path:}/myHealthCheck")
-				.applyTo(this.context);
+			.of("server.port=8989", "server.servlet.context-path=/servletContextPath",
+					"eureka.instance.health-check-url-path=${server.servlet.context-path:}/myHealthCheck")
+			.applyTo(this.context);
 		setupContext(RefreshAutoConfiguration.class);
 		EurekaInstanceConfigBean instance = this.context.getBean(EurekaInstanceConfigBean.class);
 		assertThat(instance.getHealthCheckUrl()).as("Wrong health check: " + instance.getHealthCheckUrl())
-				.endsWith(":8989/servletContextPath/myHealthCheck");
+			.endsWith(":8989/servletContextPath/myHealthCheck");
 	}
 
 	@Test
 	void statusPageUrlPathAndManagementPortKabobCase() {
-		TestPropertyValues.of("server.port=8989", "management.server.port=9999",
-				"eureka.instance.status-page-url-path=/myStatusPage").applyTo(this.context);
+		TestPropertyValues
+			.of("server.port=8989", "management.server.port=9999", "eureka.instance.status-page-url-path=/myStatusPage")
+			.applyTo(this.context);
 		setupContext(RefreshAutoConfiguration.class);
 		EurekaInstanceConfigBean instance = this.context.getBean(EurekaInstanceConfigBean.class);
 		assertThat(instance.getStatusPageUrl().contains("/myStatusPage"))
-				.as("Wrong status page: " + instance.getStatusPageUrl()).isTrue();
+			.as("Wrong status page: " + instance.getStatusPageUrl())
+			.isTrue();
 	}
 
 	@Test
 	void statusPageUrlAndPreferIpAddress() {
-		TestPropertyValues.of("server.port=8989", "management.server.port=9999", "eureka.instance.hostname=foo",
-				"eureka.instance.prefer-ip-address:true").applyTo(this.context);
+		TestPropertyValues
+			.of("server.port=8989", "management.server.port=9999", "eureka.instance.hostname=foo",
+					"eureka.instance.prefer-ip-address:true")
+			.applyTo(this.context);
 
 		setupContext(RefreshAutoConfiguration.class);
 		EurekaInstanceConfigBean instance = this.context.getBean(EurekaInstanceConfigBean.class);
 
 		assertThat(instance.getStatusPageUrl()).as("statusPageUrl is wrong")
-				.isEqualTo("http://" + instance.getIpAddress() + ":9999/actuator/info");
+			.isEqualTo("http://" + instance.getIpAddress() + ":9999/actuator/info");
 		assertThat(instance.getHealthCheckUrl()).as("healthCheckUrl is wrong")
-				.isEqualTo("http://" + instance.getIpAddress() + ":9999/actuator/health");
+			.isEqualTo("http://" + instance.getIpAddress() + ":9999/actuator/health");
 	}
 
 	@Test
 	void statusPageAndHealthCheckUrlsShouldSetUserDefinedIpAddress() {
 		TestPropertyValues
-				.of("server.port=8989", "management.server.port=9999", "eureka.instance.hostname=foo",
-						"eureka.instance.ip-address:192.168.13.90", "eureka.instance.prefer-ip-address:true")
-				.applyTo(this.context);
+			.of("server.port=8989", "management.server.port=9999", "eureka.instance.hostname=foo",
+					"eureka.instance.ip-address:192.168.13.90", "eureka.instance.prefer-ip-address:true")
+			.applyTo(this.context);
 
 		setupContext(RefreshAutoConfiguration.class);
 		EurekaInstanceConfigBean instance = this.context.getBean(EurekaInstanceConfigBean.class);
 
 		assertThat(instance.getStatusPageUrl()).as("statusPageUrl is wrong")
-				.isEqualTo("http://192.168.13.90:9999/actuator/info");
+			.isEqualTo("http://192.168.13.90:9999/actuator/info");
 		assertThat(instance.getHealthCheckUrl()).as("healthCheckUrl is wrong")
-				.isEqualTo("http://192.168.13.90:9999/actuator/health");
+			.isEqualTo("http://192.168.13.90:9999/actuator/health");
 	}
 
 	@Test
 	void healthCheckUrlPathAndManagementPortKabobCase() {
-		TestPropertyValues.of("server.port=8989", "management.server.port=9999",
-				"eureka.instance.health-check-url-path=/myHealthCheck").applyTo(this.context);
+		TestPropertyValues
+			.of("server.port=8989", "management.server.port=9999",
+					"eureka.instance.health-check-url-path=/myHealthCheck")
+			.applyTo(this.context);
 		setupContext(RefreshAutoConfiguration.class);
 		EurekaInstanceConfigBean instance = this.context.getBean(EurekaInstanceConfigBean.class);
 		assertThat(instance.getHealthCheckUrl().contains("/myHealthCheck"))
-				.as("Wrong health check: " + instance.getHealthCheckUrl()).isTrue();
+			.as("Wrong health check: " + instance.getHealthCheckUrl())
+			.isTrue();
 	}
 
 	@Test
@@ -419,7 +460,8 @@ class EurekaClientAutoConfigurationTests {
 		setupContext(RefreshAutoConfiguration.class);
 		EurekaInstanceConfigBean instance = this.context.getBean(EurekaInstanceConfigBean.class);
 		assertThat(instance.getStatusPageUrl().contains("/myStatusPage"))
-				.as("Wrong status page: " + instance.getStatusPageUrl()).isTrue();
+			.as("Wrong status page: " + instance.getStatusPageUrl())
+			.isTrue();
 	}
 
 	@Test
@@ -429,35 +471,36 @@ class EurekaClientAutoConfigurationTests {
 		setupContext(RefreshAutoConfiguration.class);
 		EurekaInstanceConfigBean instance = this.context.getBean(EurekaInstanceConfigBean.class);
 		assertThat(instance.getHealthCheckUrl().contains("/myHealthCheck"))
-				.as("Wrong health check: " + instance.getHealthCheckUrl()).isTrue();
+			.as("Wrong health check: " + instance.getHealthCheckUrl())
+			.isTrue();
 	}
 
 	@Test
 	void hostname() {
 		TestPropertyValues.of("server.port=8989", "management.server.port=9999", "eureka.instance.hostname=foo")
-				.applyTo(this.context);
+			.applyTo(this.context);
 		setupContext(RefreshAutoConfiguration.class);
 		EurekaInstanceConfigBean instance = this.context.getBean(EurekaInstanceConfigBean.class);
 		assertThat(instance.getStatusPageUrl().contains("foo")).as("Wrong status page: " + instance.getStatusPageUrl())
-				.isTrue();
+			.isTrue();
 	}
 
 	@Test
 	void refreshScopedBeans() {
 		setupContext(RefreshAutoConfiguration.class);
 		assertThat(this.context.getBeanDefinition("eurekaClient").getBeanClassName())
-				.startsWith(GenericScope.class.getName() + "$LockedScopedProxyFactoryBean");
+			.startsWith(GenericScope.class.getName() + "$LockedScopedProxyFactoryBean");
 		assertThat(this.context.getBeanDefinition("eurekaApplicationInfoManager").getBeanClassName())
-				.startsWith(GenericScope.class.getName() + "$LockedScopedProxyFactoryBean");
+			.startsWith(GenericScope.class.getName() + "$LockedScopedProxyFactoryBean");
 	}
 
 	@SuppressWarnings({ "unchecked", "rawtypes" })
 	@Test
 	void shouldReregisterHealthCheckHandlerAfterRefresh() throws Exception {
 		TestPropertyValues
-				.of("eureka.client.healthcheck.enabled=true", "spring.cloud.config.import-check.enabled=false",
-						"spring.cloud.refresh.additionalPropertySourcesToRetain=test")
-				.applyTo(this.context);
+			.of("eureka.client.healthcheck.enabled=true", "spring.cloud.config.import-check.enabled=false",
+					"spring.cloud.refresh.additionalPropertySourcesToRetain=test")
+			.applyTo(this.context);
 		setupContext(RefreshAutoConfiguration.class, AutoServiceRegistrationConfiguration.class);
 
 		EurekaClient oldEurekaClient = getLazyInitEurekaClient();
@@ -597,13 +640,14 @@ class EurekaClientAutoConfigurationTests {
 	@Test
 	void shouldNotHaveDiscoveryClientWhenBlockingDiscoveryDisabled() {
 		new ApplicationContextRunner()
-				.withConfiguration(AutoConfigurations.of(UtilAutoConfiguration.class,
-						DiscoveryClientOptionalArgsConfiguration.class, EurekaClientAutoConfiguration.class,
-						EurekaDiscoveryClientConfiguration.class))
-				.withPropertyValues("spring.cloud.discovery.blocking.enabled=false").run(context -> {
-					assertThat(context).doesNotHaveBean(DiscoveryClient.class);
-					assertThat(context).doesNotHaveBean(DiscoveryClientHealthIndicator.class);
-				});
+			.withConfiguration(
+					AutoConfigurations.of(UtilAutoConfiguration.class, DiscoveryClientOptionalArgsConfiguration.class,
+							EurekaClientAutoConfiguration.class, EurekaDiscoveryClientConfiguration.class))
+			.withPropertyValues("spring.cloud.discovery.blocking.enabled=false")
+			.run(context -> {
+				assertThat(context).doesNotHaveBean(DiscoveryClient.class);
+				assertThat(context).doesNotHaveBean(DiscoveryClientHealthIndicator.class);
+			});
 	}
 
 	@SuppressWarnings({ "unchecked", "rawtypes" })
@@ -641,7 +685,7 @@ class EurekaClientAutoConfigurationTests {
 
 	private EurekaClient getLazyInitEurekaClient() throws Exception {
 		return (EurekaClient) ((Advised) this.context.getBean("eurekaClient", EurekaClient.class)).getTargetSource()
-				.getTarget();
+			.getTarget();
 	}
 
 	@Configuration(proxyBeanMethods = false)

spring-cloud-netflix-eureka-client/src/test/java/org/springframework/cloud/netflix/eureka/EurekaClientConfigBeanTests.java

@@ -59,7 +59,7 @@ class EurekaClientConfigBeanTests {
 		this.context.register(PropertyPlaceholderAutoConfiguration.class, TestConfiguration.class);
 		this.context.refresh();
 		assertThat(this.context.getBean(EurekaClientConfigBean.class).getServiceUrl().toString())
-				.isEqualTo("{defaultZone=https://example.com}");
+			.isEqualTo("{defaultZone=https://example.com}");
 		assertThat(getEurekaServiceUrlsForDefaultZone()).isEqualTo("[https://example.com/]");
 	}
 

spring-cloud-netflix-eureka-client/src/test/java/org/springframework/cloud/netflix/eureka/EurekaInstanceConfigBeanTests.java

@@ -169,7 +169,8 @@ class EurekaInstanceConfigBeanTests {
 		setupContext();
 		EurekaInstanceConfigBean instance = getInstanceConfig();
 		assertThat(getInstanceConfig().getHostname().equals(instance.getIpAddress()))
-				.as("Wrong hostname: " + instance.getHostname()).isTrue();
+			.as("Wrong hostname: " + instance.getHostname())
+			.isTrue();
 
 	}
 
@@ -184,12 +185,14 @@ class EurekaInstanceConfigBeanTests {
 
 	@Test
 	void testCustomVirtualHostName() {
-		TestPropertyValues.of("spring.application.name:myapp", "eureka.instance.virtualHostName=myvirthost",
-				"eureka.instance.secureVirtualHostName=mysecurevirthost").applyTo(this.context);
+		TestPropertyValues
+			.of("spring.application.name:myapp", "eureka.instance.virtualHostName=myvirthost",
+					"eureka.instance.secureVirtualHostName=mysecurevirthost")
+			.applyTo(this.context);
 		setupContext();
 		assertThat(getInstanceConfig().getVirtualHostName()).as("virtualHostName wrong").isEqualTo("myvirthost");
 		assertThat(getInstanceConfig().getSecureVirtualHostName()).as("secureVirtualHostName wrong")
-				.isEqualTo("mysecurevirthost");
+			.isEqualTo("mysecurevirthost");
 
 	}
 
@@ -198,9 +201,9 @@ class EurekaInstanceConfigBeanTests {
 		setupContext();
 		assertThat(getInstanceConfig().getAppname()).as("default app name is wrong").isEqualTo("unknown");
 		assertThat(getInstanceConfig().getVirtualHostName()).as("default virtual hostname is wrong")
-				.isEqualTo("unknown");
+			.isEqualTo("unknown");
 		assertThat(getInstanceConfig().getSecureVirtualHostName()).as("default secure virtual hostname is wrong")
-				.isEqualTo("unknown");
+			.isEqualTo("unknown");
 	}
 
 	@Test

spring-cloud-netflix-eureka-client/src/test/java/org/springframework/cloud/netflix/eureka/EurekaServiceInstanceTests.java

@@ -24,8 +24,11 @@ class EurekaServiceInstanceTests {
 
 	@Test
 	void getSchemeReturnsNonNull() {
-		InstanceInfo instanceInfo = InstanceInfo.Builder.newBuilder().setAppName("test").setHostName("myhost")
-				.setPort(8080).build();
+		InstanceInfo instanceInfo = InstanceInfo.Builder.newBuilder()
+			.setAppName("test")
+			.setHostName("myhost")
+			.setPort(8080)
+			.build();
 		EurekaServiceInstance instance = new EurekaServiceInstance(instanceInfo);
 		Assertions.assertThat(instance.getScheme()).isEqualTo("http");
 	}

spring-cloud-netflix-eureka-client/src/test/java/org/springframework/cloud/netflix/eureka/config/ConfigRefreshTests.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2013-2022 the original author or authors.
+ * Copyright 2013-2024 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -31,6 +31,7 @@ import static org.springframework.boot.test.context.SpringBootTest.WebEnvironmen
 
 /**
  * @author Ryan Baxter
+ * @author Kaiyao Ke
  */
 @SpringBootTest(webEnvironment = RANDOM_PORT, classes = RefreshEurekaSampleApplication.class)
 class ConfigRefreshTests {
@@ -42,6 +43,8 @@ class ConfigRefreshTests {
 	// Mocked in RefreshEurekaSampleApplication
 	private EurekaClient client;
 
+	private static boolean isFirstRun = true;
+
 	@Test
 	// This test is used to verify that getApplications is called the correct number of
 	// times when a refresh event is fired. The getApplications call in
@@ -49,8 +52,9 @@ class ConfigRefreshTests {
 	// ensures that the EurekaClient bean is recreated after a refresh event and that we
 	// reregister the client with the server
 	void verifyGetApplications() {
-		if (publisher != null) {
+		if (publisher != null && isFirstRun) {
 			publisher.publishEvent(new RefreshScopeRefreshedEvent());
+			isFirstRun = false;
 		}
 		verify(client, times(3)).getApplications();
 	}

spring-cloud-netflix-eureka-client/src/test/java/org/springframework/cloud/netflix/eureka/config/EurekaClientConfigServerAutoConfigurationTests.java

@@ -36,33 +36,35 @@ class EurekaClientConfigServerAutoConfigurationTests {
 	@Test
 	void offByDefault() {
 		new ApplicationContextRunner()
-				.withConfiguration(AutoConfigurations.of(EurekaClientConfigServerAutoConfiguration.class))
-				.run(c -> assertThat(c.getBeanNamesForType(EurekaInstanceConfigBean.class).length).isEqualTo(0));
+			.withConfiguration(AutoConfigurations.of(EurekaClientConfigServerAutoConfiguration.class))
+			.run(c -> assertThat(c.getBeanNamesForType(EurekaInstanceConfigBean.class).length).isEqualTo(0));
 	}
 
 	@Test
 	void onWhenRequested() {
 		new ApplicationContextRunner()
-				.withConfiguration(AutoConfigurations.of(EurekaClientConfigServerAutoConfiguration.class,
-						UtilAutoConfiguration.class, ConfigServerProperties.class, EurekaInstanceConfigBean.class))
-				.withPropertyValues("spring.cloud.config.server.prefix=/config").run(c -> {
-					assertThat(c.getBeanNamesForType(EurekaInstanceConfig.class).length).isEqualTo(1);
-					EurekaInstanceConfig instance = c.getBean(EurekaInstanceConfig.class);
-					assertThat(instance.getMetadataMap().get("configPath")).isEqualTo("/config");
-				});
+			.withConfiguration(AutoConfigurations.of(EurekaClientConfigServerAutoConfiguration.class,
+					UtilAutoConfiguration.class, ConfigServerProperties.class, EurekaInstanceConfigBean.class))
+			.withPropertyValues("spring.cloud.config.server.prefix=/config")
+			.run(c -> {
+				assertThat(c.getBeanNamesForType(EurekaInstanceConfig.class).length).isEqualTo(1);
+				EurekaInstanceConfig instance = c.getBean(EurekaInstanceConfig.class);
+				assertThat(instance.getMetadataMap().get("configPath")).isEqualTo("/config");
+			});
 	}
 
 	@Test
 	void notOverridingMetamapSettings() {
 		new ApplicationContextRunner()
-				.withConfiguration(AutoConfigurations.of(EurekaClientConfigServerAutoConfiguration.class,
-						UtilAutoConfiguration.class, ConfigServerProperties.class, EurekaInstanceConfigBean.class))
-				.withPropertyValues("spring.cloud.config.server.prefix=/config")
-				.withPropertyValues("eureka.instance.metadataMap.configPath=/differentpath").run(c -> {
-					assertThat(c.getBeanNamesForType(EurekaInstanceConfig.class).length).isEqualTo(1);
-					EurekaInstanceConfig instance = c.getBean(EurekaInstanceConfig.class);
-					assertThat(instance.getMetadataMap().get("configPath")).isEqualTo("/differentpath");
-				});
+			.withConfiguration(AutoConfigurations.of(EurekaClientConfigServerAutoConfiguration.class,
+					UtilAutoConfiguration.class, ConfigServerProperties.class, EurekaInstanceConfigBean.class))
+			.withPropertyValues("spring.cloud.config.server.prefix=/config")
+			.withPropertyValues("eureka.instance.metadataMap.configPath=/differentpath")
+			.run(c -> {
+				assertThat(c.getBeanNamesForType(EurekaInstanceConfig.class).length).isEqualTo(1);
+				EurekaInstanceConfig instance = c.getBean(EurekaInstanceConfig.class);
+				assertThat(instance.getMetadataMap().get("configPath")).isEqualTo("/differentpath");
+			});
 	}
 
 }

spring-cloud-netflix-eureka-client/src/test/java/org/springframework/cloud/netflix/eureka/config/EurekaConfigServerBootstrapConfigurationClientTests.java

@@ -0,0 +1,131 @@
+/*
+ * Copyright 2013-2024 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.cloud.netflix.eureka.config;
+
+import com.netflix.discovery.shared.transport.EurekaHttpClient;
+import org.junit.jupiter.api.Nested;
+import org.junit.jupiter.api.Test;
+
+import org.springframework.beans.factory.NoSuchBeanDefinitionException;
+import org.springframework.boot.autoconfigure.AutoConfigurations;
+import org.springframework.boot.test.context.runner.ApplicationContextRunner;
+import org.springframework.cloud.netflix.eureka.http.RestClientEurekaHttpClient;
+import org.springframework.cloud.netflix.eureka.http.RestTemplateEurekaHttpClient;
+import org.springframework.cloud.netflix.eureka.http.WebClientEurekaHttpClient;
+import org.springframework.cloud.test.ClassPathExclusions;
+
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.assertj.core.api.Assertions.assertThatThrownBy;
+
+/**
+ * @author Wonchul Heo
+ */
+class EurekaConfigServerBootstrapConfigurationClientTests {
+
+	@Test
+	void properBeansCreatedWhenRestTemplateEnabled() {
+		new ApplicationContextRunner()
+			.withConfiguration(AutoConfigurations.of(EurekaConfigServerBootstrapConfiguration.class))
+			.withPropertyValues("spring.cloud.config.discovery.enabled=true")
+			.withPropertyValues("eureka.client.enabled=true")
+			.withPropertyValues("eureka.client.restclient.enabled=false")
+			.run(context -> {
+				assertThat(context).hasSingleBean(RestTemplateEurekaHttpClient.class);
+				assertThat(context).doesNotHaveBean(RestClientEurekaHttpClient.class);
+				assertThat(context).doesNotHaveBean(WebClientEurekaHttpClient.class);
+			});
+	}
+
+	@Test
+	void properBeansCreatedWhenRestClientEnabled() {
+		new ApplicationContextRunner()
+			.withConfiguration(AutoConfigurations.of(EurekaConfigServerBootstrapConfiguration.class))
+			.withPropertyValues("spring.cloud.config.discovery.enabled=true")
+			.withPropertyValues("eureka.client.enabled=true")
+			.withPropertyValues("eureka.client.restclient.enabled=true")
+			.run(context -> {
+				assertThat(context).hasSingleBean(RestClientEurekaHttpClient.class);
+				assertThat(context).doesNotHaveBean(WebClientEurekaHttpClient.class);
+			});
+	}
+
+	@Test
+	void properBeansCreatedWhenWebClientEnabled() {
+		new ApplicationContextRunner()
+			.withConfiguration(AutoConfigurations.of(EurekaConfigServerBootstrapConfiguration.class))
+			.withPropertyValues("spring.cloud.config.discovery.enabled=true")
+			.withPropertyValues("eureka.client.enabled=true")
+			.withPropertyValues("eureka.client.webclient.enabled=true")
+			.run(context -> {
+				final EurekaHttpClient bean = context.getBean(EurekaHttpClient.class);
+				System.out.println(bean);
+				assertThat(context).hasSingleBean(WebClientEurekaHttpClient.class);
+				assertThat(context).doesNotHaveBean(RestClientEurekaHttpClient.class);
+			});
+	}
+
+	@Nested
+	@ClassPathExclusions({ "spring-webflux-*" })
+	static class NoWebFlux {
+
+		@Test
+		void properBeansCreatedWhenRestTemplateEnabled() {
+			new ApplicationContextRunner()
+				.withConfiguration(AutoConfigurations.of(EurekaConfigServerBootstrapConfiguration.class))
+				.withPropertyValues("spring.cloud.config.discovery.enabled=true")
+				.withPropertyValues("eureka.client.enabled=true")
+				.withPropertyValues("eureka.client.restclient.enabled=false")
+				.run(context -> {
+					assertThat(context).hasSingleBean(RestTemplateEurekaHttpClient.class);
+					assertThat(context).doesNotHaveBean(RestClientEurekaHttpClient.class);
+					assertThat(context).doesNotHaveBean(WebClientEurekaHttpClient.class);
+				});
+		}
+
+		@Test
+		void properBeansCreatedWhenRestClientEnabled() {
+			new ApplicationContextRunner()
+				.withConfiguration(AutoConfigurations.of(EurekaConfigServerBootstrapConfiguration.class))
+				.withPropertyValues("spring.cloud.config.discovery.enabled=true")
+				.withPropertyValues("eureka.client.enabled=true")
+				.withPropertyValues("eureka.client.restclient.enabled=true")
+				.run(context -> {
+					assertThat(context).hasSingleBean(RestClientEurekaHttpClient.class);
+					assertThat(context).doesNotHaveBean(WebClientEurekaHttpClient.class);
+				});
+		}
+
+		@Test
+		void properBeansCreatedWhenWebClientEnabledThenFailed() {
+			new ApplicationContextRunner()
+				.withConfiguration(AutoConfigurations.of(EurekaConfigServerBootstrapConfiguration.class))
+				.withPropertyValues("spring.cloud.config.discovery.enabled=true")
+				.withPropertyValues("eureka.client.enabled=true")
+				.withPropertyValues("eureka.client.webclient.enabled=true")
+				.run(context -> {
+					assertThatThrownBy(() -> context.getBean(WebClientEurekaHttpClient.class))
+						.hasRootCauseInstanceOf(NoSuchBeanDefinitionException.class)
+						.hasRootCauseMessage(
+								"No qualifying bean of type 'com.netflix.discovery.shared.transport.EurekaHttpClient' available: "
+										+ "expected at least 1 bean which qualifies as autowire candidate. "
+										+ "Dependency annotations: {}");
+				});
+		}
+
+	}
+
+}

spring-cloud-netflix-eureka-client/src/test/java/org/springframework/cloud/netflix/eureka/config/EurekaConfigServerBootstrapConfigurationRestClientIntegrationTests.java

@@ -0,0 +1,87 @@
+/*
+ * Copyright 2013-2024 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.cloud.netflix.eureka.config;
+
+import org.junit.jupiter.api.Test;
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.SpringBootConfiguration;
+import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.boot.test.web.server.LocalServerPort;
+import org.springframework.cloud.netflix.eureka.http.RestClientEurekaHttpClient;
+import org.springframework.context.annotation.Bean;
+import org.springframework.http.HttpStatus;
+import org.springframework.http.ResponseEntity;
+import org.springframework.security.config.annotation.web.builders.HttpSecurity;
+import org.springframework.security.config.annotation.web.configurers.AbstractHttpConfigurer;
+import org.springframework.security.web.SecurityFilterChain;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.RestController;
+import org.springframework.web.client.RestClient;
+
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.springframework.boot.test.context.SpringBootTest.WebEnvironment.RANDOM_PORT;
+
+/**
+ * @author Wonchul Heo
+ */
+@SpringBootTest(
+		properties = { "spring.cloud.config.discovery.enabled=true", "eureka.client.enabled=true",
+				"spring.config.use-legacy-processing=true", "eureka.client.restclient.enabled=true" },
+		webEnvironment = RANDOM_PORT)
+class EurekaConfigServerBootstrapConfigurationRestClientIntegrationTests {
+
+	@LocalServerPort
+	private int port;
+
+	@Autowired
+	private RestClientEurekaHttpClient eurekaHttpClient;
+
+	@Test
+	void restClientRespectsCodecProperties() {
+		RestClient restClient = eurekaHttpClient.getRestClient();
+		ResponseEntity<String> response = restClient.get()
+			.uri("http://localhost:" + port)
+			.retrieve()
+			.toEntity(String.class);
+
+		assertThat(response).isNotNull();
+		assertThat(response.getStatusCode()).isEqualTo(HttpStatus.OK);
+		assertThat(response.getBody()).isEqualTo("rest-client");
+	}
+
+	@SpringBootConfiguration(proxyBeanMethods = false)
+	@EnableAutoConfiguration
+	@RestController
+	static class RestClientController {
+
+		@GetMapping("/")
+		public String hello() {
+			return "rest-client";
+		}
+
+		@Bean
+		public SecurityFilterChain securityFilterChain(HttpSecurity http) throws Exception {
+			return http.authorizeHttpRequests(auth -> auth.anyRequest().permitAll())
+				.csrf(AbstractHttpConfigurer::disable)
+				.build();
+		}
+
+	}
+
+}

spring-cloud-netflix-eureka-client/src/test/java/org/springframework/cloud/netflix/eureka/config/EurekaConfigServerBootstrapConfigurationRestClientTests.java

@@ -0,0 +1,62 @@
+/*
+ * Copyright 2013-2024 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.cloud.netflix.eureka.config;
+
+import org.junit.jupiter.api.Test;
+
+import org.springframework.boot.autoconfigure.AutoConfigurations;
+import org.springframework.boot.test.context.runner.ApplicationContextRunner;
+import org.springframework.cloud.config.client.ConfigServerInstanceProvider;
+import org.springframework.cloud.netflix.eureka.EurekaClientConfigBean;
+import org.springframework.cloud.netflix.eureka.http.RestClientEurekaHttpClient;
+import org.springframework.cloud.netflix.eureka.http.RestTemplateEurekaHttpClient;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+/**
+ * @author Wonchul Heo
+ */
+class EurekaConfigServerBootstrapConfigurationRestClientTests {
+
+	@Test
+	void properBeansCreatedWhenEnabled() {
+		new ApplicationContextRunner()
+			.withConfiguration(AutoConfigurations.of(EurekaConfigServerBootstrapConfiguration.class))
+			.withPropertyValues("spring.cloud.config.discovery.enabled=true", "eureka.client.enabled=true",
+					"eureka.client.restclient.enabled=true")
+			.run(context -> {
+				assertThat(context).hasSingleBean(EurekaClientConfigBean.class);
+				assertThat(context).hasSingleBean(RestClientEurekaHttpClient.class);
+				assertThat(context).hasSingleBean(ConfigServerInstanceProvider.Function.class);
+			});
+	}
+
+	@Test
+	void properBeansCreatedWhenEnabledRestClientDisabled() {
+		new ApplicationContextRunner()
+			.withConfiguration(AutoConfigurations.of(EurekaConfigServerBootstrapConfiguration.class))
+			.withPropertyValues("spring.cloud.config.discovery.enabled=true", "eureka.client.enabled=true",
+					"eureka.client.restclient.enabled=false")
+			.run(context -> {
+				assertThat(context).hasSingleBean(EurekaClientConfigBean.class);
+				assertThat(context).doesNotHaveBean(RestClientEurekaHttpClient.class);
+				assertThat(context).hasSingleBean(RestTemplateEurekaHttpClient.class);
+				assertThat(context).hasSingleBean(ConfigServerInstanceProvider.Function.class);
+			});
+	}
+
+}

spring-cloud-netflix-eureka-client/src/test/java/org/springframework/cloud/netflix/eureka/config/EurekaConfigServerBootstrapConfigurationTests.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2013-2022 the original author or authors.
+ * Copyright 2013-2024 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -51,7 +51,9 @@ import static org.mockito.Mockito.when;
 
 /**
  * @author Spencer Gibb
+ * @author Tang Xiong
  */
+@SuppressWarnings("removal")
 @RunWith(ModifiedClassPathRunner.class)
 @ClassPathExclusions("spring-webflux-*")
 public class EurekaConfigServerBootstrapConfigurationTests {
@@ -62,96 +64,100 @@ public class EurekaConfigServerBootstrapConfigurationTests {
 	@Test
 	public void offByDefault() {
 		new ApplicationContextRunner()
-				.withConfiguration(AutoConfigurations.of(EurekaConfigServerBootstrapConfiguration.class))
-				.run(this::assertEurekaBeansNotPresent);
+			.withConfiguration(AutoConfigurations.of(EurekaConfigServerBootstrapConfiguration.class))
+			.run(this::assertEurekaBeansNotPresent);
 	}
 
 	@Test
 	public void properBeansCreatedWhenDiscoveryEnabled() {
 		new ApplicationContextRunner()
-				.withConfiguration(AutoConfigurations.of(EurekaConfigServerBootstrapConfiguration.class))
-				.withPropertyValues("spring.cloud.config.discovery.enabled=true").run(this::assertEurekaBeansPresent);
+			.withConfiguration(AutoConfigurations.of(EurekaConfigServerBootstrapConfiguration.class))
+			.withPropertyValues("spring.cloud.config.discovery.enabled=true")
+			.run(this::assertEurekaBeansPresent);
 	}
 
 	@Test
 	public void beansNotCreatedWhenDiscoveryNotEnabled() {
 		new ApplicationContextRunner()
-				.withConfiguration(AutoConfigurations.of(EurekaConfigServerBootstrapConfiguration.class))
-				.withPropertyValues("spring.cloud.config.discovery.enabled=false")
-				.run(this::assertEurekaBeansNotPresent);
+			.withConfiguration(AutoConfigurations.of(EurekaConfigServerBootstrapConfiguration.class))
+			.withPropertyValues("spring.cloud.config.discovery.enabled=false")
+			.run(this::assertEurekaBeansNotPresent);
 	}
 
 	@Test
 	public void beansNotCreatedWhenDiscoveryDisabled() {
 		new ApplicationContextRunner()
-				.withConfiguration(AutoConfigurations.of(EurekaConfigServerBootstrapConfiguration.class))
-				.withPropertyValues("spring.cloud.config.discovery.disabled").run(this::assertEurekaBeansNotPresent);
+			.withConfiguration(AutoConfigurations.of(EurekaConfigServerBootstrapConfiguration.class))
+			.withPropertyValues("spring.cloud.config.discovery.disabled")
+			.run(this::assertEurekaBeansNotPresent);
 	}
 
 	@Test
 	public void beansNotCreatedWhenEurekaClientEnabled() {
 		new ApplicationContextRunner()
-				.withConfiguration(AutoConfigurations.of(EurekaConfigServerBootstrapConfiguration.class))
-				.withPropertyValues("eureka.client.enabled=true").run(this::assertEurekaBeansNotPresent);
+			.withConfiguration(AutoConfigurations.of(EurekaConfigServerBootstrapConfiguration.class))
+			.withPropertyValues("eureka.client.enabled=true")
+			.run(this::assertEurekaBeansNotPresent);
 	}
 
 	@Test
 	public void beansNotCreatedWhenEurekaClientNotEnabled() {
 		new ApplicationContextRunner()
-				.withConfiguration(AutoConfigurations.of(EurekaConfigServerBootstrapConfiguration.class))
-				.withPropertyValues("eureka.client.enabled=false").run(this::assertEurekaBeansNotPresent);
+			.withConfiguration(AutoConfigurations.of(EurekaConfigServerBootstrapConfiguration.class))
+			.withPropertyValues("eureka.client.enabled=false")
+			.run(this::assertEurekaBeansNotPresent);
 	}
 
 	@Test
 	public void beansNotCreatedWhenEurekaClientDisabled() {
 		new ApplicationContextRunner()
-				.withConfiguration(AutoConfigurations.of(EurekaConfigServerBootstrapConfiguration.class))
-				.withPropertyValues("eureka.client.disabled").run(this::assertEurekaBeansNotPresent);
+			.withConfiguration(AutoConfigurations.of(EurekaConfigServerBootstrapConfiguration.class))
+			.withPropertyValues("eureka.client.disabled")
+			.run(this::assertEurekaBeansNotPresent);
 	}
 
 	@Test
 	public void properBeansCreatedWhenDiscoveryEnabled_EurekaEnabled() {
 		new ApplicationContextRunner()
-				.withConfiguration(AutoConfigurations.of(EurekaConfigServerBootstrapConfiguration.class))
-				.withPropertyValues("spring.cloud.config.discovery.enabled=true", "eureka.client.enabled=true")
-				.run(this::assertEurekaBeansPresent);
+			.withConfiguration(AutoConfigurations.of(EurekaConfigServerBootstrapConfiguration.class))
+			.withPropertyValues("spring.cloud.config.discovery.enabled=true", "eureka.client.enabled=true")
+			.run(this::assertEurekaBeansPresent);
 	}
 
 	@Test
 	public void beansNotCreatedWhenDiscoveryEnabled_EurekaNotEnabled() {
 		new ApplicationContextRunner()
-				.withConfiguration(AutoConfigurations.of(EurekaConfigServerBootstrapConfiguration.class))
-				.withPropertyValues("spring.cloud.config.discovery.enabled=true", "eureka.client.enabled=false")
-				.run(this::assertEurekaBeansNotPresent);
+			.withConfiguration(AutoConfigurations.of(EurekaConfigServerBootstrapConfiguration.class))
+			.withPropertyValues("spring.cloud.config.discovery.enabled=true", "eureka.client.enabled=false")
+			.run(this::assertEurekaBeansNotPresent);
 	}
 
 	@Test
 	public void beansNotCreatedWhenDiscoveryNotEnabled_EurekaEnabled() {
 		new ApplicationContextRunner()
-				.withConfiguration(AutoConfigurations.of(EurekaConfigServerBootstrapConfiguration.class))
-				.withPropertyValues("spring.cloud.config.discovery.enabled=false", "eureka.client.enabled=true")
-				.run(this::assertEurekaBeansNotPresent);
+			.withConfiguration(AutoConfigurations.of(EurekaConfigServerBootstrapConfiguration.class))
+			.withPropertyValues("spring.cloud.config.discovery.enabled=false", "eureka.client.enabled=true")
+			.run(this::assertEurekaBeansNotPresent);
 	}
 
 	@Test
 	public void beansNotCreatedWhenDiscoveryNotEnabled_EurekaNotEnabled() {
 		new ApplicationContextRunner()
-				.withConfiguration(AutoConfigurations.of(EurekaConfigServerBootstrapConfiguration.class))
-				.withPropertyValues("spring.cloud.config.discovery.enabled=false", "eureka.client.enabled=false")
-				.run(this::assertEurekaBeansNotPresent);
+			.withConfiguration(AutoConfigurations.of(EurekaConfigServerBootstrapConfiguration.class))
+			.withPropertyValues("spring.cloud.config.discovery.enabled=false", "eureka.client.enabled=false")
+			.run(this::assertEurekaBeansNotPresent);
 	}
 
 	@Test
 	public void eurekaDnsConfigurationWorks() {
 		new ApplicationContextRunner()
-				.withConfiguration(AutoConfigurations.of(EurekaConfigServerBootstrapConfiguration.class))
-				.withPropertyValues("spring.cloud.config.discovery.enabled=true", "eureka.client.enabled=true",
-						"eureka.instance.hostname=eurekaclient1",
-						"eureka.client.use-dns-for-fetching-service-urls=true",
-						"eureka.client.eureka-server-d-n-s-name=myeurekahost",
-						"eureka.client.eureka-server-u-r-l-context=eureka", "eureka.client.eureka-server-port=30000")
-				.run(context -> assertThat(output)
-						.contains("Cannot get cnames bound to the region:txt.us-east-1.myeurekahost"));
+			.withConfiguration(AutoConfigurations.of(EurekaConfigServerBootstrapConfiguration.class))
+			.withPropertyValues("spring.cloud.config.discovery.enabled=true", "eureka.client.enabled=true",
+					"eureka.instance.hostname=eurekaclient1", "eureka.client.use-dns-for-fetching-service-urls=true",
+					"eureka.client.eureka-server-d-n-s-name=myeurekahost",
+					"eureka.client.eureka-server-u-r-l-context=eureka", "eureka.client.eureka-server-port=30000")
+			.run(context -> assertThat(output)
+				.contains("Cannot get cnames bound to the region:txt.us-east-1.myeurekahost"));
 	}
 
 	@Test
@@ -159,13 +165,43 @@ public class EurekaConfigServerBootstrapConfigurationTests {
 		// FIXME: why do I need to do this? (fails in maven build without it.
 		TomcatURLStreamHandlerFactory.disable();
 		new SpringApplicationBuilder(TestConfigDiscoveryConfiguration.class)
-				.properties("spring.config.use-legacy-processing=true", "spring.cloud.config.discovery.enabled=true",
-						"eureka.client.enabled=true",
-						"spring.main.sources=" + TestConfigDiscoveryBootstrapConfiguration.class.getName(),
-						"logging.level.org.springframework.cloud.netflix.eureka.config=DEBUG")
-				.run();
+			.properties("spring.config.use-legacy-processing=true", "spring.cloud.config.discovery.enabled=true",
+					"eureka.client.enabled=true",
+					"spring.main.sources=" + TestConfigDiscoveryBootstrapConfiguration.class.getName(),
+					"logging.level.org.springframework.cloud.netflix.eureka.config=DEBUG")
+			.run()
+			.close();
 		assertThat(output).contains("eurekaConfigServerInstanceProvider finding instances for configserver")
-				.contains("eurekaConfigServerInstanceProvider found 1 instance(s) for configserver");
+			.contains("eurekaConfigServerInstanceProvider found 1 instance(s) for configserver");
+	}
+
+	@Test
+	public void eurekaConfigServerInstanceProviderCalledWithRemoteRegions() {
+		TomcatURLStreamHandlerFactory.disable();
+		new SpringApplicationBuilder(TestConfigDiscoveryConfiguration.class)
+			.properties("spring.config.use-legacy-processing=true", "spring.cloud.config.discovery.enabled=true",
+					"eureka.client.enabled=true", "eureka.client.fetchRemoteRegionsRegistry=us-east-1,us-east-2",
+					"spring.main.sources=" + TestConfigDiscoveryBootstrapConfiguration.class.getName(),
+					"logging.level.org.springframework.cloud.netflix.eureka.config=DEBUG")
+			.run()
+			.close();
+		assertThat(output).contains("eurekaConfigServerInstanceProvider finding instances for configserver")
+			.contains("eurekaConfigServerInstanceProvider found 1 instance(s) for configserver");
+	}
+
+	@Test
+	public void eurekaConfigServerInstanceProviderCalledWithVipAddress() {
+		TomcatURLStreamHandlerFactory.disable();
+		new SpringApplicationBuilder(TestConfigDiscoveryConfiguration.class)
+			.properties("spring.config.use-legacy-processing=true", "spring.cloud.config.discovery.enabled=true",
+					"eureka.client.enabled=true", "eureka.client.registryRefreshSingleVipAddress=vip1",
+					"eureka.client.fetchRemoteRegionsRegistry=us-east-1,us-east-2",
+					"spring.main.sources=" + TestConfigDiscoveryBootstrapConfiguration.class.getName(),
+					"logging.level.org.springframework.cloud.netflix.eureka.config=DEBUG")
+			.run()
+			.close();
+		assertThat(output).contains("eurekaConfigServerInstanceProvider finding instances for configserver")
+			.contains("eurekaConfigServerInstanceProvider found 1 instance(s) for configserver");
 	}
 
 	private void assertEurekaBeansPresent(AssertableApplicationContext context) {
@@ -208,7 +244,9 @@ public class EurekaConfigServerBootstrapConfigurationTests {
 			when(response.getEntity()).thenReturn(applications);
 
 			EurekaHttpClient client = mock(EurekaHttpClient.class);
-			when(client.getApplications("us-east-1")).thenReturn(response);
+			when(client.getApplications("us-east-1", "us-east-2")).thenReturn(response);
+			when(client.getApplications((String) null)).thenReturn(response);
+			when(client.getVip("vip1", "us-east-1", "us-east-2")).thenReturn(response);
 			return client;
 		}
 

spring-cloud-netflix-eureka-client/src/test/java/org/springframework/cloud/netflix/eureka/config/EurekaConfigServerBootstrapConfigurationWebClientIntegrationTests.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2013-2022 the original author or authors.
+ * Copyright 2013-2024 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -26,11 +26,12 @@ import org.springframework.boot.test.web.server.LocalServerPort;
 import org.springframework.cloud.netflix.eureka.http.WebClientEurekaHttpClient;
 import org.springframework.context.annotation.Bean;
 import org.springframework.http.HttpStatus;
+import org.springframework.http.ResponseEntity;
 import org.springframework.security.config.annotation.web.builders.HttpSecurity;
+import org.springframework.security.config.annotation.web.configurers.AbstractHttpConfigurer;
 import org.springframework.security.web.SecurityFilterChain;
 import org.springframework.web.bind.annotation.GetMapping;
 import org.springframework.web.bind.annotation.RestController;
-import org.springframework.web.reactive.function.client.ClientResponse;
 import org.springframework.web.reactive.function.client.WebClient;
 
 import static org.assertj.core.api.Assertions.assertThat;
@@ -53,10 +54,15 @@ class EurekaConfigServerBootstrapConfigurationWebClientIntegrationTests {
 	@Test
 	void webClientRespectsCodecProperties() {
 		WebClient webClient = eurekaHttpClient.getWebClient();
-		ClientResponse response = webClient.get().uri("http://localhost:" + port).exchange().block();
+		ResponseEntity<String> response = webClient.get()
+			.uri("http://localhost:" + port)
+			.retrieve()
+			.toEntity(String.class)
+			.block();
+
 		assertThat(response).isNotNull();
-		assertThat(response.statusCode()).isEqualTo(HttpStatus.OK);
-		assertThat(response.bodyToMono(String.class).block()).startsWith("....").hasSize(300000);
+		assertThat(response.getStatusCode()).isEqualTo(HttpStatus.OK);
+		assertThat(response.getBody()).startsWith("....").hasSize(300000);
 	}
 
 	@SpringBootConfiguration
@@ -71,8 +77,9 @@ class EurekaConfigServerBootstrapConfigurationWebClientIntegrationTests {
 
 		@Bean
 		public SecurityFilterChain securityFilterChain(HttpSecurity http) throws Exception {
-			http.authorizeHttpRequests().anyRequest().permitAll().and().csrf().disable();
-			return http.build();
+			return http.authorizeHttpRequests(auth -> auth.anyRequest().permitAll())
+				.csrf(AbstractHttpConfigurer::disable)
+				.build();
 		}
 
 	}

spring-cloud-netflix-eureka-client/src/test/java/org/springframework/cloud/netflix/eureka/config/EurekaConfigServerBootstrapConfigurationWebClientTests.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2013-2022 the original author or authors.
+ * Copyright 2013-2024 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -30,32 +30,33 @@ import static org.assertj.core.api.Assertions.assertThat;
 /**
  * @author Spencer Gibb
  */
+@SuppressWarnings("removal")
 class EurekaConfigServerBootstrapConfigurationWebClientTests {
 
 	@Test
 	void properBeansCreatedWhenEnabled() {
 		new ApplicationContextRunner()
-				.withConfiguration(AutoConfigurations.of(EurekaConfigServerBootstrapConfiguration.class))
-				.withPropertyValues("spring.cloud.config.discovery.enabled=true", "eureka.client.enabled=true",
-						"eureka.client.webclient.enabled=true")
-				.run(context -> {
-					assertThat(context).hasSingleBean(EurekaClientConfigBean.class);
-					assertThat(context).hasSingleBean(WebClientEurekaHttpClient.class);
-					assertThat(context).hasSingleBean(ConfigServerInstanceProvider.Function.class);
-				});
+			.withConfiguration(AutoConfigurations.of(EurekaConfigServerBootstrapConfiguration.class))
+			.withPropertyValues("spring.cloud.config.discovery.enabled=true", "eureka.client.enabled=true",
+					"eureka.client.webclient.enabled=true")
+			.run(context -> {
+				assertThat(context).hasSingleBean(EurekaClientConfigBean.class);
+				assertThat(context).hasSingleBean(WebClientEurekaHttpClient.class);
+				assertThat(context).hasSingleBean(ConfigServerInstanceProvider.Function.class);
+			});
 	}
 
 	@Test
 	void properBeansCreatedWhenEnabledWebClientDisabled() {
 		new ApplicationContextRunner()
-				.withConfiguration(AutoConfigurations.of(EurekaConfigServerBootstrapConfiguration.class))
-				.withPropertyValues("spring.cloud.config.discovery.enabled=true", "eureka.client.enabled=true")
-				.run(context -> {
-					assertThat(context).hasSingleBean(EurekaClientConfigBean.class);
-					assertThat(context).doesNotHaveBean(WebClientEurekaHttpClient.class);
-					assertThat(context).hasSingleBean(RestTemplateEurekaHttpClient.class);
-					assertThat(context).hasSingleBean(ConfigServerInstanceProvider.Function.class);
-				});
+			.withConfiguration(AutoConfigurations.of(EurekaConfigServerBootstrapConfiguration.class))
+			.withPropertyValues("spring.cloud.config.discovery.enabled=true", "eureka.client.enabled=true")
+			.run(context -> {
+				assertThat(context).hasSingleBean(EurekaClientConfigBean.class);
+				assertThat(context).doesNotHaveBean(WebClientEurekaHttpClient.class);
+				assertThat(context).hasSingleBean(RestTemplateEurekaHttpClient.class);
+				assertThat(context).hasSingleBean(ConfigServerInstanceProvider.Function.class);
+			});
 	}
 
 }

spring-cloud-netflix-eureka-client/src/test/java/org/springframework/cloud/netflix/eureka/config/EurekaConfigServerBootstrapperIntegrationTests.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2013-2023 the original author or authors.
+ * Copyright 2013-2024 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -59,10 +59,10 @@ import static org.mockserver.model.HttpResponse.response;
  * @author Ryan Baxter
  */
 @Testcontainers
-public class EurekaConfigServerBootstrapperIT {
+public class EurekaConfigServerBootstrapperIntegrationTests {
 
 	public static final DockerImageName MOCKSERVER_IMAGE = DockerImageName.parse("mockserver/mockserver")
-			.withTag("mockserver-" + MockServerClient.class.getPackage().getImplementationVersion());
+		.withTag("mockserver-" + MockServerClient.class.getPackage().getImplementationVersion());
 
 	@Container
 	static MockServerContainer mockServer = new MockServerContainer(MOCKSERVER_IMAGE);
@@ -93,21 +93,25 @@ public class EurekaConfigServerBootstrapperIT {
 		try (MockServerClient mockServerClient = new MockServerClient(mockServer.getHost(),
 				mockServer.getMappedPort(MockServerContainer.PORT))) {
 			mockServerClient.when(request().withPath("/application/default"))
-					.respond(response().withBody(objectMapper.writeValueAsString(environment))
-							.withHeader("content-type", "application/json"));
+				.respond(response().withBody(objectMapper.writeValueAsString(environment))
+					.withHeader("content-type", "application/json"));
 			InstanceInfo configServerInstanceInfo = InstanceInfo.Builder.newBuilder()
-					.setVIPAddress("eureka-configserver").setInstanceId("eureka-configserver")
-					.setAppName("eureka-configserver").setStatus(InstanceInfo.InstanceStatus.UP)
-					.enablePort(InstanceInfo.PortType.UNSECURE, true).setHostName("localhost")
-					.setPort(mockServer.getMappedPort(MockServerContainer.PORT)).build();
+				.setVIPAddress("eureka-configserver")
+				.setInstanceId("eureka-configserver")
+				.setAppName("eureka-configserver")
+				.setStatus(InstanceInfo.InstanceStatus.UP)
+				.enablePort(InstanceInfo.PortType.UNSECURE, true)
+				.setHostName("localhost")
+				.setPort(mockServer.getMappedPort(MockServerContainer.PORT))
+				.build();
 			Application configServer = new Application("eureka-configserver",
 					Collections.singletonList(configServerInstanceInfo));
 			EurekaApplications eurekaApplications = new EurekaApplications("hashcode", 0L,
 					Collections.singletonList(configServer));
 			mockServerClient.when(request().withPath("/apps/"))
-					.respond(response()
-							.withBody("{\"applications\":" + objectMapper.writeValueAsString(eurekaApplications) + "}")
-							.withHeader("content-type", "application/json"));
+				.respond(response()
+					.withBody("{\"applications\":" + objectMapper.writeValueAsString(eurekaApplications) + "}")
+					.withHeader("content-type", "application/json"));
 			this.context = setup().run();
 			assertThat(this.context.getEnvironment().getProperty("hello")).isEqualTo("world");
 		}
@@ -129,7 +133,7 @@ public class EurekaConfigServerBootstrapperIT {
 
 	SpringApplicationBuilder setup(String... env) {
 		SpringApplicationBuilder builder = new SpringApplicationBuilder(TestConfig.class)
-				.properties(addDefaultEnv(env));
+			.properties(addDefaultEnv(env));
 		return builder;
 	}
 

spring-cloud-netflix-eureka-client/src/test/java/org/springframework/cloud/netflix/eureka/config/EurekaConfigServerBootstrapperTests.java

@@ -37,59 +37,67 @@ class EurekaConfigServerBootstrapperTests {
 	@Test
 	void notEnabledReturnsEmptyList() {
 		new SpringApplicationBuilder(TestConfig.class)
-				.properties("spring.cloud.service-registry.auto-registration.enabled=false")
-				.addBootstrapRegistryInitializer(registry -> registry.addCloseListener(event -> {
-					ConfigServerInstanceProvider.Function providerFn = event.getBootstrapContext()
-							.get(ConfigServerInstanceProvider.Function.class);
-					assertThat(providerFn.apply("id")).as("Should return empty list").isEmpty();
-				})).run().close();
+			.properties("spring.cloud.service-registry.auto-registration.enabled=false")
+			.addBootstrapRegistryInitializer(registry -> registry.addCloseListener(event -> {
+				ConfigServerInstanceProvider.Function providerFn = event.getBootstrapContext()
+					.get(ConfigServerInstanceProvider.Function.class);
+				assertThat(providerFn.apply("id")).as("Should return empty list").isEmpty();
+			}))
+			.run()
+			.close();
 	}
 
 	@Test
 	public void discoveryClientNotEnabledProvidesEmptyList() {
 		new SpringApplicationBuilder(TestConfig.class)
-				.properties("spring.cloud.config.discovery.enabled=true", "spring.cloud.discovery.enabled=false",
-						"spring.cloud.service-registry.auto-registration.enabled=false")
-				.addBootstrapRegistryInitializer(registry -> registry.addCloseListener(event -> {
-					ConfigServerInstanceProvider.Function providerFn = event.getBootstrapContext()
-							.get(ConfigServerInstanceProvider.Function.class);
-					Binder binder = event.getBootstrapContext().get(Binder.class);
-					BindHandler bindHandler = event.getBootstrapContext().get(BindHandler.class);
-					assertThat(providerFn.apply("id", binder, bindHandler, mock(Log.class)))
-							.as("Should return empty list").isEmpty();
-				})).run().close();
+			.properties("spring.cloud.config.discovery.enabled=true", "spring.cloud.discovery.enabled=false",
+					"spring.cloud.service-registry.auto-registration.enabled=false")
+			.addBootstrapRegistryInitializer(registry -> registry.addCloseListener(event -> {
+				ConfigServerInstanceProvider.Function providerFn = event.getBootstrapContext()
+					.get(ConfigServerInstanceProvider.Function.class);
+				Binder binder = event.getBootstrapContext().get(Binder.class);
+				BindHandler bindHandler = event.getBootstrapContext().get(BindHandler.class);
+				assertThat(providerFn.apply("id", binder, bindHandler, mock(Log.class))).as("Should return empty list")
+					.isEmpty();
+			}))
+			.run()
+			.close();
 	}
 
 	@Test
 	public void eurekaClientNotEnabledProvidesEmptyList() {
 		new SpringApplicationBuilder(TestConfig.class)
-				.properties("spring.cloud.config.discovery.enabled=true", "eureka.client.enabled=false",
-						"spring.cloud.service-registry.auto-registration.enabled=false")
-				.addBootstrapRegistryInitializer(registry -> registry.addCloseListener(event -> {
-					ConfigServerInstanceProvider.Function providerFn = event.getBootstrapContext()
-							.get(ConfigServerInstanceProvider.Function.class);
-					Binder binder = event.getBootstrapContext().get(Binder.class);
-					BindHandler bindHandler = event.getBootstrapContext().get(BindHandler.class);
-					assertThat(providerFn.apply("id", binder, bindHandler, mock(Log.class)))
-							.as("Should return empty list").isEmpty();
-				})).run().close();
+			.properties("spring.cloud.config.discovery.enabled=true", "eureka.client.enabled=false",
+					"spring.cloud.service-registry.auto-registration.enabled=false")
+			.addBootstrapRegistryInitializer(registry -> registry.addCloseListener(event -> {
+				ConfigServerInstanceProvider.Function providerFn = event.getBootstrapContext()
+					.get(ConfigServerInstanceProvider.Function.class);
+				Binder binder = event.getBootstrapContext().get(Binder.class);
+				BindHandler bindHandler = event.getBootstrapContext().get(BindHandler.class);
+				assertThat(providerFn.apply("id", binder, bindHandler, mock(Log.class))).as("Should return empty list")
+					.isEmpty();
+			}))
+			.run()
+			.close();
 	}
 
 	@Test
 	void enabledAddsInstanceProviderFn() {
 		new SpringApplicationBuilder(TestConfig.class)
-				.properties("spring.config.import: classpath:bootstrapper.yaml",
-						ConfigClientProperties.PREFIX + ".enabled=true")
-				.addBootstrapRegistryInitializer(registry -> registry.addCloseListener(event -> {
-					ConfigServerInstanceProvider.Function providerFn = event.getBootstrapContext()
-							.get(ConfigServerInstanceProvider.Function.class);
-					Binder binder = event.getBootstrapContext().get(Binder.class);
-					BindHandler bindHandler = event.getBootstrapContext().get(BindHandler.class);
-					assertThatThrownBy(() -> providerFn.apply("id", binder, bindHandler, mock(Log.class)))
-							.isInstanceOf(ResourceAccessException.class)
-							.hasMessageContaining("I/O error on GET request for \"http://localhost:8761/eureka/apps/\"")
-							.as("Should have tried to connect to Eureka to fetch instances.");
-				})).run().close();
+			.properties("spring.config.import: classpath:bootstrapper.yaml",
+					ConfigClientProperties.PREFIX + ".enabled=true")
+			.addBootstrapRegistryInitializer(registry -> registry.addCloseListener(event -> {
+				ConfigServerInstanceProvider.Function providerFn = event.getBootstrapContext()
+					.get(ConfigServerInstanceProvider.Function.class);
+				Binder binder = event.getBootstrapContext().get(Binder.class);
+				BindHandler bindHandler = event.getBootstrapContext().get(BindHandler.class);
+				assertThatThrownBy(() -> providerFn.apply("id", binder, bindHandler, mock(Log.class)))
+					.isInstanceOf(ResourceAccessException.class)
+					.hasMessageContaining("I/O error on GET request for \"http://localhost:8761/eureka/apps/\"")
+					.as("Should have tried to connect to Eureka to fetch instances.");
+			}))
+			.run()
+			.close();
 	}
 
 	@SpringBootConfiguration

spring-cloud-netflix-eureka-client/src/test/java/org/springframework/cloud/netflix/eureka/config/EurekaHttpClientsOptionalArgsConfigurationNoWebFluxTests.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2017-2022 the original author or authors.
+ * Copyright 2017-2024 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -37,7 +37,7 @@ import static org.assertj.core.api.AssertionsForInterfaceTypes.assertThat;
 @RunWith(ModifiedClassPathRunner.class)
 @ClassPathExclusions({ "jersey-client-*", "jersey-core-*", "jersey-apache-client4-*", "spring-webflux-*" })
 @SpringBootTest(classes = EurekaSampleApplication.class, webEnvironment = WebEnvironment.RANDOM_PORT)
-public class EurekaHttpClientsOptionalArgsConfigurationNoWebfluxTest {
+public class EurekaHttpClientsOptionalArgsConfigurationNoWebFluxTests {
 
 	@Test
 	public void contextFailsWithoutWebClient() {
@@ -46,7 +46,8 @@ public class EurekaHttpClientsOptionalArgsConfigurationNoWebfluxTest {
 		try {
 			TomcatURLStreamHandlerFactory.disable();
 			ctx = new SpringApplicationBuilder(EurekaSampleApplication.class)
-					.properties("eureka.client.webclient.enabled=true").run();
+				.properties("eureka.client.webclient.enabled=true")
+				.run();
 			fail("exception not thrown");
 		}
 		catch (Exception e) {

spring-cloud-netflix-eureka-client/src/test/java/org/springframework/cloud/netflix/eureka/config/EurekaHttpClientsOptionalArgsConfigurationTest.java

@@ -1,67 +0,0 @@
-/*
- * Copyright 2017-2022 the original author or authors.
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *      https://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-package org.springframework.cloud.netflix.eureka.config;
-
-import org.junit.Test;
-import org.junit.runner.RunWith;
-
-import org.springframework.boot.test.context.SpringBootTest;
-import org.springframework.boot.test.context.SpringBootTest.WebEnvironment;
-import org.springframework.boot.test.context.runner.WebApplicationContextRunner;
-import org.springframework.cloud.netflix.eureka.http.RestTemplateDiscoveryClientOptionalArgs;
-import org.springframework.cloud.netflix.eureka.http.WebClientDiscoveryClientOptionalArgs;
-import org.springframework.cloud.netflix.eureka.sample.EurekaSampleApplication;
-import org.springframework.cloud.test.ClassPathExclusions;
-import org.springframework.cloud.test.ModifiedClassPathRunner;
-
-import static org.assertj.core.api.AssertionsForInterfaceTypes.assertThat;
-
-/**
- * @author Daniel Lavoie
- */
-@RunWith(ModifiedClassPathRunner.class)
-@ClassPathExclusions({ "jersey-client-*", "jersey-core-*", "jersey-apache-client4-*" })
-@SpringBootTest(classes = EurekaSampleApplication.class, webEnvironment = WebEnvironment.RANDOM_PORT)
-public class EurekaHttpClientsOptionalArgsConfigurationTest {
-
-	@Test
-	public void contextLoadsWithRestTemplate() {
-		new WebApplicationContextRunner().withUserConfiguration(EurekaSampleApplication.class)
-				.withPropertyValues("eureka.client.webclient.enabled=false").run(context -> {
-					assertThat(context).hasSingleBean(RestTemplateDiscoveryClientOptionalArgs.class);
-					assertThat(context).doesNotHaveBean(WebClientDiscoveryClientOptionalArgs.class);
-				});
-	}
-
-	@Test
-	public void contextLoadsWithWebClient() {
-		new WebApplicationContextRunner().withUserConfiguration(EurekaSampleApplication.class)
-				.withPropertyValues("eureka.client.webclient.enabled=true").run(context -> {
-					assertThat(context).doesNotHaveBean(RestTemplateDiscoveryClientOptionalArgs.class);
-					assertThat(context).hasSingleBean(WebClientDiscoveryClientOptionalArgs.class);
-				});
-	}
-
-	@Test
-	public void contextLoadsWithRestTemplateAsDefault() {
-		new WebApplicationContextRunner().withUserConfiguration(EurekaSampleApplication.class).run(context -> {
-			assertThat(context).hasSingleBean(RestTemplateDiscoveryClientOptionalArgs.class);
-			assertThat(context).doesNotHaveBean(WebClientDiscoveryClientOptionalArgs.class);
-		});
-	}
-
-}

spring-cloud-netflix-eureka-client/src/test/java/org/springframework/cloud/netflix/eureka/config/EurekaHttpClientsOptionalArgsConfigurationTests.java

@@ -0,0 +1,99 @@
+/*
+ * Copyright 2017-2024 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.cloud.netflix.eureka.config;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.boot.test.context.SpringBootTest.WebEnvironment;
+import org.springframework.boot.test.context.runner.WebApplicationContextRunner;
+import org.springframework.cloud.netflix.eureka.http.RestClientDiscoveryClientOptionalArgs;
+import org.springframework.cloud.netflix.eureka.http.RestTemplateDiscoveryClientOptionalArgs;
+import org.springframework.cloud.netflix.eureka.http.WebClientDiscoveryClientOptionalArgs;
+import org.springframework.cloud.netflix.eureka.sample.EurekaSampleApplication;
+import org.springframework.cloud.test.ClassPathExclusions;
+import org.springframework.cloud.test.ModifiedClassPathRunner;
+
+import static org.assertj.core.api.AssertionsForInterfaceTypes.assertThat;
+
+/**
+ * @author Daniel Lavoie
+ * @author Wonchul Heo
+ */
+@RunWith(ModifiedClassPathRunner.class)
+@ClassPathExclusions({ "jersey-client-*", "jersey-core-*", "jersey-apache-client4-*" })
+@SpringBootTest(classes = EurekaSampleApplication.class, webEnvironment = WebEnvironment.RANDOM_PORT)
+public class EurekaHttpClientsOptionalArgsConfigurationTests {
+
+	@Test
+	public void contextLoadsWithRestTemplateWhenWebClientDisabled() {
+		new WebApplicationContextRunner().withUserConfiguration(EurekaSampleApplication.class)
+			.withPropertyValues("eureka.client.webclient.enabled=false")
+			.withPropertyValues("eureka.client.restclient.enabled=false")
+			.run(context -> {
+				assertThat(context).hasSingleBean(RestTemplateDiscoveryClientOptionalArgs.class);
+				assertThat(context).doesNotHaveBean(WebClientDiscoveryClientOptionalArgs.class);
+				assertThat(context).doesNotHaveBean(RestClientDiscoveryClientOptionalArgs.class);
+			});
+	}
+
+	@Test
+	public void contextLoadsWithRestTemplateWhenRestClientDisabled() {
+		new WebApplicationContextRunner().withUserConfiguration(EurekaSampleApplication.class)
+			.withPropertyValues("eureka.client.restclient.enabled=false")
+			.run(context -> {
+				assertThat(context).hasSingleBean(RestTemplateDiscoveryClientOptionalArgs.class);
+				assertThat(context).doesNotHaveBean(WebClientDiscoveryClientOptionalArgs.class);
+				assertThat(context).doesNotHaveBean(RestClientDiscoveryClientOptionalArgs.class);
+			});
+	}
+
+	@Test
+	public void contextLoadsWithWebClient() {
+		new WebApplicationContextRunner().withUserConfiguration(EurekaSampleApplication.class)
+			.withPropertyValues("eureka.client.webclient.enabled=true")
+			.run(context -> {
+				assertThat(context).doesNotHaveBean(RestTemplateDiscoveryClientOptionalArgs.class);
+				assertThat(context).hasSingleBean(WebClientDiscoveryClientOptionalArgs.class);
+				assertThat(context).doesNotHaveBean(RestClientDiscoveryClientOptionalArgs.class);
+			});
+	}
+
+	@Test
+	public void contextLoadsWithRestClient() {
+		new WebApplicationContextRunner().withUserConfiguration(EurekaSampleApplication.class)
+			.withPropertyValues("eureka.client.restclient.enabled=true")
+			.run(context -> {
+				assertThat(context).doesNotHaveBean(RestTemplateDiscoveryClientOptionalArgs.class);
+				assertThat(context).doesNotHaveBean(WebClientDiscoveryClientOptionalArgs.class);
+				assertThat(context).hasSingleBean(RestClientDiscoveryClientOptionalArgs.class);
+			});
+	}
+
+	@Test
+	public void contextLoadsWithRestTemplateAsDefault() {
+		new WebApplicationContextRunner().withUserConfiguration(EurekaSampleApplication.class)
+			.withPropertyValues("eureka.client.restclient.enabled=false")
+			.run(context -> {
+				assertThat(context).hasSingleBean(RestTemplateDiscoveryClientOptionalArgs.class);
+				assertThat(context).doesNotHaveBean(WebClientDiscoveryClientOptionalArgs.class);
+				assertThat(context).doesNotHaveBean(RestClientDiscoveryClientOptionalArgs.class);
+			});
+	}
+
+}

spring-cloud-netflix-eureka-client/src/test/java/org/springframework/cloud/netflix/eureka/config/JerseyClientOptionalArgsConfigurationTests.java

@@ -0,0 +1,53 @@
+/*
+ * Copyright 2017-2024 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.cloud.netflix.eureka.config;
+
+import com.netflix.discovery.AbstractDiscoveryClientOptionalArgs;
+import org.junit.jupiter.api.Test;
+
+import org.springframework.boot.autoconfigure.AutoConfigurations;
+import org.springframework.boot.test.context.runner.ApplicationContextRunner;
+import org.springframework.cloud.netflix.eureka.http.RestTemplateDiscoveryClientOptionalArgs;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+/**
+ * Tests for Jersey client setup in DiscoveryClientOptionalArgsConfiguration.
+ *
+ * @author Olga Maciaszek-Sharma
+ */
+@SuppressWarnings("deprecation")
+public class JerseyClientOptionalArgsConfigurationTests {
+
+	@SuppressWarnings("OptionalGetWithoutIsPresent")
+	@Test
+	void shouldCreateRestTemplateDiscoveryClientOptionalArgsWhenJerseyClientDisabled() {
+		new ApplicationContextRunner()
+			.withConfiguration(AutoConfigurations.of(DiscoveryClientOptionalArgsConfiguration.class))
+			.withPropertyValues("eureka.client.jersey.enabled=false")
+			.run(context -> {
+				assertThat(context).hasSingleBean(AbstractDiscoveryClientOptionalArgs.class);
+				assertThat(context.getBeansOfType(AbstractDiscoveryClientOptionalArgs.class)
+					.values()
+					.stream()
+					.findFirst()
+					.get()).isInstanceOf(RestTemplateDiscoveryClientOptionalArgs.class);
+				assertThat(context).hasSingleBean(RestTemplateDiscoveryClientOptionalArgs.class);
+			});
+	}
+
+}

spring-cloud-netflix-eureka-client/src/test/java/org/springframework/cloud/netflix/eureka/config/JerseyOptionalArgsConfigurationApplicationTests.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2017-2022 the original author or authors.
+ * Copyright 2017-2024 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -32,7 +32,7 @@ import static org.assertj.core.api.Assertions.assertThat;
  */
 @DirtiesContext
 @SpringBootTest(classes = EurekaSampleApplication.class, webEnvironment = WebEnvironment.RANDOM_PORT)
-class JerseyOptionalArgsConfigurationTest {
+class JerseyOptionalArgsConfigurationApplicationTests {
 
 	@Autowired
 	private AbstractDiscoveryClientOptionalArgs optionalArgs;

spring-cloud-netflix-eureka-client/src/test/java/org/springframework/cloud/netflix/eureka/healthcheck/EurekaHealthCheckTests.java

@@ -51,7 +51,7 @@ class EurekaHealthCheckTests {
 		System.setProperty("status", "UP");
 
 		InstanceInfo.InstanceStatus status = this.discoveryClient.getHealthCheckHandler()
-				.getStatus(InstanceInfo.InstanceStatus.UNKNOWN);
+			.getStatus(InstanceInfo.InstanceStatus.UNKNOWN);
 
 		assertThat(status).isNotNull();
 		assertThat(status).isEqualTo(InstanceInfo.InstanceStatus.UP);
@@ -62,7 +62,7 @@ class EurekaHealthCheckTests {
 		System.setProperty("status", "OUT_OF_SERVICE");
 
 		InstanceInfo.InstanceStatus status = this.discoveryClient.getHealthCheckHandler()
-				.getStatus(InstanceInfo.InstanceStatus.UNKNOWN);
+			.getStatus(InstanceInfo.InstanceStatus.UNKNOWN);
 
 		assertThat(status).isNotNull();
 		assertThat(status).isEqualTo(InstanceInfo.InstanceStatus.DOWN);

spring-cloud-netflix-eureka-client/src/test/java/org/springframework/cloud/netflix/eureka/http/AbstractEurekaHttpClientTests.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2022 the original author or authors.
+ * Copyright 2012-2024 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -21,6 +21,8 @@ import com.netflix.discovery.shared.Applications;
 import com.netflix.discovery.shared.transport.EurekaHttpClient;
 import com.netflix.discovery.shared.transport.EurekaHttpResponse;
 import org.junit.jupiter.api.Test;
+import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.provider.ValueSource;
 
 import org.springframework.http.HttpStatus;
 
@@ -28,6 +30,7 @@ import static org.assertj.core.api.Assertions.assertThat;
 
 /**
  * @author Haytham Mohamed
+ * @author Václav Plic
  **/
 abstract class AbstractEurekaHttpClientTests {
 
@@ -47,9 +50,10 @@ abstract class AbstractEurekaHttpClientTests {
 		assertThat(eurekaHttpClient.cancel("test", "test").getStatusCode()).isEqualTo(HttpStatus.OK.value());
 	}
 
-	@Test
-	void testSendHeartBeat() {
-		EurekaHttpResponse<InstanceInfo> response = eurekaHttpClient.sendHeartBeat("test", "test", info, null);
+	@ParameterizedTest
+	@ValueSource(strings = { "test", "test#1.[3.?]!" })
+	void testSendHeartBeat(String instanceId) {
+		EurekaHttpResponse<InstanceInfo> response = eurekaHttpClient.sendHeartBeat("test", instanceId, info, null);
 		assertThat(response.getStatusCode()).isEqualTo(HttpStatus.OK.value());
 		assertThat(response.getEntity()).isNotNull();
 	}
@@ -57,25 +61,27 @@ abstract class AbstractEurekaHttpClientTests {
 	@Test
 	void testSendHeartBeatFourOFour() {
 		assertThat(eurekaHttpClient.sendHeartBeat("fourOFour", "test", info, null).getStatusCode())
-				.isEqualTo(HttpStatus.NOT_FOUND.value());
+			.isEqualTo(HttpStatus.NOT_FOUND.value());
 	}
 
 	@Test
 	void testSendHeartBeatFourOFourWithBody() {
 		assertThat(eurekaHttpClient.sendHeartBeat("fourOFourWithBody", "test", info, null).getStatusCode())
-				.isEqualTo(HttpStatus.NOT_FOUND.value());
+			.isEqualTo(HttpStatus.NOT_FOUND.value());
 	}
 
-	@Test
-	void testStatusUpdate() {
-		assertThat(eurekaHttpClient.statusUpdate("test", "test", InstanceInfo.InstanceStatus.UP, info).getStatusCode())
-				.isEqualTo(HttpStatus.OK.value());
+	@ParameterizedTest
+	@ValueSource(strings = { "test", "test#1.[3.?]!" })
+	void testStatusUpdate(String instanceId) {
+		assertThat(
+				eurekaHttpClient.statusUpdate("test", instanceId, InstanceInfo.InstanceStatus.UP, info).getStatusCode())
+			.isEqualTo(HttpStatus.OK.value());
 	}
 
 	@Test
 	void testDeleteStatusOverride() {
 		assertThat(eurekaHttpClient.deleteStatusOverride("test", "test", info).getStatusCode())
-				.isEqualTo(HttpStatus.OK.value());
+			.isEqualTo(HttpStatus.OK.value());
 	}
 
 	@Test
@@ -108,10 +114,11 @@ abstract class AbstractEurekaHttpClientTests {
 		eurekaHttpClient.getApplication("test");
 	}
 
-	@Test
-	void testGetInstance() {
-		eurekaHttpClient.getInstance("test");
-		eurekaHttpClient.getInstance("test", "test");
+	@ParameterizedTest
+	@ValueSource(strings = { "test", "test#1.[3.?]!" })
+	void testGetInstance(String instanceId) {
+		eurekaHttpClient.getInstance(instanceId);
+		eurekaHttpClient.getInstance("test", instanceId);
 	}
 
 }

spring-cloud-netflix-eureka-client/src/test/java/org/springframework/cloud/netflix/eureka/http/EurekaServerMockApplication.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2017-2022 the original author or authors.
+ * Copyright 2017-2025 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -31,6 +31,7 @@ import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;
 import org.springframework.core.Ordered;
 import org.springframework.core.annotation.Order;
+import org.springframework.http.HttpHeaders;
 import org.springframework.http.HttpStatus;
 import org.springframework.http.ResponseEntity;
 import org.springframework.http.converter.json.MappingJackson2HttpMessageConverter;
@@ -45,6 +46,7 @@ import org.springframework.web.bind.annotation.PathVariable;
 import org.springframework.web.bind.annotation.PostMapping;
 import org.springframework.web.bind.annotation.PutMapping;
 import org.springframework.web.bind.annotation.RequestBody;
+import org.springframework.web.bind.annotation.RequestHeader;
 import org.springframework.web.bind.annotation.RequestMapping;
 import org.springframework.web.bind.annotation.RequestParam;
 import org.springframework.web.bind.annotation.ResponseStatus;
@@ -58,6 +60,8 @@ import static org.springframework.util.Assert.isTrue;
  * Mocked Eureka Server.
  *
  * @author Daniel Lavoie
+ * @author Wonchul Heo
+ * @author Olga Maciaszek-Sharma
  */
 @Configuration(proxyBeanMethods = false)
 @RestController
@@ -65,26 +69,46 @@ import static org.springframework.util.Assert.isTrue;
 @SpringBootApplication
 public class EurekaServerMockApplication {
 
-	private static final InstanceInfo INFO = InstanceInfo.Builder.newBuilder().setInstanceId("app1instance1")
-			.setAppName("app1").setAppNameForDeser("app1fordeser").setAppGroupName("app1group")
-			.setAppGroupNameForDeser("app1group1fordeser").setHostName("app1host1")
-			.setStatus(InstanceInfo.InstanceStatus.UP).setOverriddenStatus(InstanceInfo.InstanceStatus.DOWN)
-			.setIPAddr("127.0.0.1").setSID("app1sid").setPort(8080).setSecurePort(4443)
-			.enablePort(InstanceInfo.PortType.UNSECURE, true).setHomePageUrl("/", "http://localhost/")
-			.setHomePageUrlForDeser("http://localhost/").setStatusPageUrl("/status", "http://localhost/info")
-			.setStatusPageUrlForDeser("http://localhost/status")
-			.setHealthCheckUrls("/ping", "http://localhost/ping", null)
-			.setHealthCheckUrlsForDeser("http://localhost/ping", null).setVIPAddress("localhost:8080")
-			.setVIPAddressDeser("localhost:8080").setSecureVIPAddress("localhost:4443")
-			.setSecureVIPAddressDeser("localhost:4443")
-			.setDataCenterInfo(new MyDataCenterInfo(DataCenterInfo.Name.MyOwn))
-			.setLeaseInfo(LeaseInfo.Builder.newBuilder().setDurationInSecs(30).setRenewalIntervalInSecs(30)
-					.setEvictionTimestamp(System.currentTimeMillis() + 30000)
-					.setRenewalTimestamp(System.currentTimeMillis() - 1000)
-					.setRegistrationTimestamp(System.currentTimeMillis() - 2000).build())
-			.add("metadatakey1", "metadatavalue1").setASGName("asg1").setIsCoordinatingDiscoveryServer(false)
-			.setLastUpdatedTimestamp(System.currentTimeMillis()).setLastDirtyTimestamp(System.currentTimeMillis())
-			.setActionType(InstanceInfo.ActionType.ADDED).setNamespace("namespace1").build();
+	private static final InstanceInfo INFO = InstanceInfo.Builder.newBuilder()
+		.setInstanceId("app1instance1")
+		.setAppName("app1")
+		.setAppNameForDeser("app1fordeser")
+		.setAppGroupName("app1group")
+		.setAppGroupNameForDeser("app1group1fordeser")
+		.setHostName("app1host1")
+		.setStatus(InstanceInfo.InstanceStatus.UP)
+		.setOverriddenStatus(InstanceInfo.InstanceStatus.DOWN)
+		.setIPAddr("127.0.0.1")
+		.setSID("app1sid")
+		.setPort(8080)
+		.setSecurePort(4443)
+		.enablePort(InstanceInfo.PortType.UNSECURE, true)
+		.setHomePageUrl("/", "http://localhost/")
+		.setHomePageUrlForDeser("http://localhost/")
+		.setStatusPageUrl("/status", "http://localhost/info")
+		.setStatusPageUrlForDeser("http://localhost/status")
+		.setHealthCheckUrls("/ping", "http://localhost/ping", null)
+		.setHealthCheckUrlsForDeser("http://localhost/ping", null)
+		.setVIPAddress("localhost:8080")
+		.setVIPAddressDeser("localhost:8080")
+		.setSecureVIPAddress("localhost:4443")
+		.setSecureVIPAddressDeser("localhost:4443")
+		.setDataCenterInfo(new MyDataCenterInfo(DataCenterInfo.Name.MyOwn))
+		.setLeaseInfo(LeaseInfo.Builder.newBuilder()
+			.setDurationInSecs(30)
+			.setRenewalIntervalInSecs(30)
+			.setEvictionTimestamp(System.currentTimeMillis() + 30000)
+			.setRenewalTimestamp(System.currentTimeMillis() - 1000)
+			.setRegistrationTimestamp(System.currentTimeMillis() - 2000)
+			.build())
+		.add("metadatakey1", "metadatavalue1")
+		.setASGName("asg1")
+		.setIsCoordinatingDiscoveryServer(false)
+		.setLastUpdatedTimestamp(System.currentTimeMillis())
+		.setLastDirtyTimestamp(System.currentTimeMillis())
+		.setActionType(InstanceInfo.ActionType.ADDED)
+		.setNamespace("namespace1")
+		.build();
 
 	/**
 	 * Simulates Eureka Server own's serialization.
@@ -92,7 +116,7 @@ public class EurekaServerMockApplication {
 	 */
 	@Bean
 	public MappingJackson2HttpMessageConverter mappingJacksonHttpMessageConverter() {
-		return new RestTemplateTransportClientFactory().mappingJacksonHttpMessageConverter();
+		return EurekaHttpClientUtils.mappingJacksonHttpMessageConverter();
 	}
 
 	@ResponseStatus(HttpStatus.OK)
@@ -151,7 +175,11 @@ public class EurekaServerMockApplication {
 	}
 
 	@GetMapping("/apps/{appName}")
-	public Application getApplication(@PathVariable String appName) {
+	public Application getApplication(@PathVariable String appName, @RequestHeader HttpHeaders headers) {
+		// Used to verify that RequestConfig customizer has taken effect
+		if (appName.equals("upgrade") && !headers.containsKey("upgrade")) {
+			throw new RuntimeException("No upgrade header found");
+		}
 		return new Application();
 	}
 
@@ -166,8 +194,11 @@ public class EurekaServerMockApplication {
 
 		@Bean
 		public InMemoryUserDetailsManager userDetailsService() {
-			UserDetails user = User.withDefaultPasswordEncoder().username("test").password("test").roles("USER")
-					.build();
+			UserDetails user = User.withDefaultPasswordEncoder()
+				.username("test")
+				.password("test")
+				.roles("USER")
+				.build();
 			return new InMemoryUserDetailsManager(user);
 		}
 

spring-cloud-netflix-eureka-client/src/test/java/org/springframework/cloud/netflix/eureka/http/RestClientEurekaHttpClientTests.java

@@ -0,0 +1,96 @@
+/*
+ * Copyright 2017-2025 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.cloud.netflix.eureka.http;
+
+import java.util.Collections;
+import java.util.Optional;
+import java.util.Set;
+
+import com.netflix.appinfo.providers.EurekaConfigBasedInstanceInfoProvider;
+import com.netflix.discovery.shared.resolver.DefaultEndpoint;
+import com.netflix.discovery.shared.transport.EurekaHttpClient;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.beans.factory.annotation.Value;
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.boot.test.context.SpringBootTest.WebEnvironment;
+import org.springframework.cloud.commons.util.InetUtils;
+import org.springframework.cloud.netflix.eureka.EurekaInstanceConfigBean;
+import org.springframework.cloud.netflix.eureka.RestClientTimeoutProperties;
+import org.springframework.test.annotation.DirtiesContext;
+import org.springframework.web.client.RestClient;
+
+import static org.assertj.core.api.AssertionsForClassTypes.assertThatExceptionOfType;
+
+/**
+ * Tests for {@link RestClientEurekaHttpClient}.
+ *
+ * @author Wonchul Heo
+ * @author Olga Maciaszek-Sharma
+ */
+@SpringBootTest(classes = EurekaServerMockApplication.class,
+		properties = { "debug=true", "security.basic.enabled=true", "eureka.client.fetch-registry=false",
+				"eureka.client.register-with-eureka=false", "logging.level.org.springframework=INFO" },
+		webEnvironment = WebEnvironment.RANDOM_PORT)
+@DirtiesContext
+class RestClientEurekaHttpClientTests extends AbstractEurekaHttpClientTests {
+
+	@Autowired
+	private InetUtils inetUtils;
+
+	@Value("http://${security.user.name}:${security.user.password}@localhost:${local.server.port}/eureka")
+	private String serviceUrl;
+
+	@BeforeEach
+	void setup() {
+		eurekaHttpClient = buildEurekaHttpClient();
+
+		EurekaInstanceConfigBean config = new EurekaInstanceConfigBean(inetUtils);
+		String appname = "customapp";
+		config.setIpAddress("127.0.0.1");
+		config.setHostname("localhost");
+		config.setAppname(appname);
+		config.setVirtualHostName(appname);
+		config.setSecureVirtualHostName(appname);
+		config.setNonSecurePort(4444);
+		config.setSecurePort(8443);
+		config.setInstanceId("127.0.0.1:customapp:4444");
+
+		info = new EurekaConfigBasedInstanceInfoProvider(config).get();
+	}
+
+	private EurekaHttpClient buildEurekaHttpClient() {
+		return buildEurekaHttpClient(Collections.emptySet());
+	}
+
+	@Test
+	void shouldCustomiseHttpClientRequestConfig() {
+		eurekaHttpClient = buildEurekaHttpClient(Set.of(builder -> builder.setProtocolUpgradeEnabled(false)));
+		assertThatExceptionOfType(RuntimeException.class).isThrownBy(() -> eurekaHttpClient.getApplication("upgrade"));
+	}
+
+	private EurekaHttpClient buildEurekaHttpClient(
+			Set<EurekaClientHttpRequestFactorySupplier.RequestConfigCustomizer> customizers) {
+		return new RestClientTransportClientFactory(Optional.empty(), Optional.empty(),
+				new DefaultEurekaClientHttpRequestFactorySupplier(new RestClientTimeoutProperties(), customizers),
+				RestClient::builder)
+			.newClient(new DefaultEndpoint(serviceUrl));
+	}
+
+}

spring-cloud-netflix-eureka-client/src/test/java/org/springframework/cloud/netflix/eureka/http/RestClientTransportClientFactoryTests.java

@@ -0,0 +1,77 @@
+/*
+ * Copyright 2017-2025 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.cloud.netflix.eureka.http;
+
+import java.util.Collections;
+import java.util.Optional;
+
+import com.netflix.discovery.shared.resolver.DefaultEndpoint;
+import com.netflix.discovery.shared.transport.EurekaHttpClient;
+import org.junit.jupiter.api.AfterEach;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+
+import org.springframework.cloud.netflix.eureka.RestClientTimeoutProperties;
+import org.springframework.web.client.RestClient;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+/**
+ * Tests for {@link RestClientTransportClientFactory}.
+ *
+ * @author Wonchul Heo
+ * @author Olga Maciaszek-Sharma
+ */
+class RestClientTransportClientFactoryTests {
+
+	private RestClientTransportClientFactory transportClientFactory;
+
+	@BeforeEach
+	void setup() {
+		transportClientFactory = new RestClientTransportClientFactory(Optional.empty(), Optional.empty(),
+				new DefaultEurekaClientHttpRequestFactorySupplier(new RestClientTimeoutProperties(),
+						Collections.emptySet()),
+				RestClient::builder);
+	}
+
+	@Test
+	void withoutUserInfo() {
+		EurekaHttpClient eurekaHttpClient = transportClientFactory
+			.newClient(new DefaultEndpoint("http://localhost:8761"));
+		assertThat(eurekaHttpClient).isInstanceOf(RestClientEurekaHttpClient.class);
+	}
+
+	@Test
+	void invalidUserInfo() {
+		EurekaHttpClient eurekaHttpClient = transportClientFactory
+			.newClient(new DefaultEndpoint("http://test@localhost:8761"));
+		assertThat(eurekaHttpClient).isInstanceOf(RestClientEurekaHttpClient.class);
+	}
+
+	@Test
+	void userInfo() {
+		EurekaHttpClient eurekaHttpClient = transportClientFactory
+			.newClient(new DefaultEndpoint("http://test:test@localhost:8761"));
+		assertThat(eurekaHttpClient).isInstanceOf(RestClientEurekaHttpClient.class);
+	}
+
+	@AfterEach
+	void shutdown() {
+		transportClientFactory.shutdown();
+	}
+
+}

spring-cloud-netflix-eureka-client/src/test/java/org/springframework/cloud/netflix/eureka/http/RestTemplateEurekaHttpClientTests.java

@@ -78,7 +78,7 @@ class RestTemplateEurekaHttpClientTests extends AbstractEurekaHttpClientTests {
 		RestTemplate restTemplate = restTemplateEurekaHttpClient.getRestTemplate();
 		List<ClientHttpRequestInterceptor> interceptors = restTemplate.getInterceptors();
 		boolean hasBasicAuth = interceptors.stream()
-				.anyMatch(interceptor -> interceptor instanceof BasicAuthenticationInterceptor);
+			.anyMatch(interceptor -> interceptor instanceof BasicAuthenticationInterceptor);
 		assertThat(hasBasicAuth).as("Basic Auth not configured").isTrue();
 	}
 

spring-cloud-netflix-eureka-client/src/test/java/org/springframework/cloud/netflix/eureka/http/RestTemplateTransportClientFactoryTest.java

@@ -1,56 +0,0 @@
-/*
- * Copyright 2017-2022 the original author or authors.
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *      https://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-package org.springframework.cloud.netflix.eureka.http;
-
-import com.netflix.discovery.shared.resolver.DefaultEndpoint;
-import org.junit.jupiter.api.AfterEach;
-import org.junit.jupiter.api.BeforeEach;
-import org.junit.jupiter.api.Test;
-
-/**
- * @author Daniel Lavoie
- */
-class RestTemplateTransportClientFactoryTest {
-
-	private RestTemplateTransportClientFactory transportClientFatory;
-
-	@BeforeEach
-	void setup() {
-		transportClientFatory = new RestTemplateTransportClientFactory();
-	}
-
-	@Test
-	void testWithoutUserInfo() {
-		transportClientFatory.newClient(new DefaultEndpoint("http://localhost:8761"));
-	}
-
-	@Test
-	void testInvalidUserInfo() {
-		transportClientFatory.newClient(new DefaultEndpoint("http://test@localhost:8761"));
-	}
-
-	@Test
-	void testUserInfo() {
-		transportClientFatory.newClient(new DefaultEndpoint("http://test:test@localhost:8761"));
-	}
-
-	@AfterEach
-	void shutdown() {
-		transportClientFatory.shutdown();
-	}
-
-}

spring-cloud-netflix-eureka-client/src/test/java/org/springframework/cloud/netflix/eureka/http/RestTemplateTransportClientFactoryTests.java

@@ -0,0 +1,94 @@
+/*
+ * Copyright 2017-2024 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.cloud.netflix.eureka.http;
+
+import java.util.Optional;
+
+import com.netflix.discovery.shared.resolver.DefaultEndpoint;
+import com.netflix.discovery.shared.transport.EurekaHttpClient;
+import org.junit.jupiter.api.AfterEach;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+
+import org.springframework.boot.http.client.ClientHttpRequestFactorySettings;
+import org.springframework.boot.http.client.ClientHttpRequestFactorySettings.Redirects;
+import org.springframework.boot.web.client.RestTemplateBuilder;
+import org.springframework.http.client.ClientHttpRequestFactory;
+import org.springframework.http.client.HttpComponentsClientHttpRequestFactory;
+import org.springframework.http.client.InterceptingClientHttpRequestFactory;
+import org.springframework.web.client.RestTemplate;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+/**
+ * @author Daniel Lavoie
+ * @author Wonchul Heo
+ */
+class RestTemplateTransportClientFactoryTests {
+
+	private RestTemplateTransportClientFactory transportClientFactory;
+
+	@BeforeEach
+	void setup() {
+		transportClientFactory = new RestTemplateTransportClientFactory();
+	}
+
+	@Test
+	void withoutUserInfo() {
+		EurekaHttpClient eurekaHttpClient = transportClientFactory
+			.newClient(new DefaultEndpoint("http://localhost:8761"));
+		assertThat(eurekaHttpClient).isInstanceOf(RestTemplateEurekaHttpClient.class);
+	}
+
+	@Test
+	void invalidUserInfo() {
+		EurekaHttpClient eurekaHttpClient = transportClientFactory
+			.newClient(new DefaultEndpoint("http://test@localhost:8761"));
+		assertThat(eurekaHttpClient).isInstanceOf(RestTemplateEurekaHttpClient.class);
+	}
+
+	@Test
+	void userInfo() {
+		EurekaHttpClient eurekaHttpClient = transportClientFactory
+			.newClient(new DefaultEndpoint("http://test:test@localhost:8761"));
+		assertThat(eurekaHttpClient).isInstanceOf(RestTemplateEurekaHttpClient.class);
+	}
+
+	@Test
+	void testRequestFactorySetWithRestTemplateBuilderSupplier() {
+		// Gateway Server WebMVC sets Redirects.DONT_FOLLOW, gh-4423
+		RestTemplateBuilder builder = new RestTemplateBuilder()
+			.requestFactorySettings(new ClientHttpRequestFactorySettings(Redirects.DONT_FOLLOW, null, null, null));
+		transportClientFactory = new RestTemplateTransportClientFactory(Optional.empty(), Optional.empty(),
+				new DefaultEurekaClientHttpRequestFactorySupplier(), () -> builder);
+		EurekaHttpClient eurekaHttpClient = transportClientFactory
+			.newClient(new DefaultEndpoint("http://localhost:8761"));
+		RestTemplateEurekaHttpClient restTemplateEurekaHttpClient = (RestTemplateEurekaHttpClient) eurekaHttpClient;
+		RestTemplate restTemplate = restTemplateEurekaHttpClient.getRestTemplate();
+		ClientHttpRequestFactory requestFactory = restTemplate.getRequestFactory();
+		if (requestFactory instanceof InterceptingClientHttpRequestFactory interceptingClientHttpRequestFactory) {
+			requestFactory = interceptingClientHttpRequestFactory.getDelegate();
+		}
+		assertThat(requestFactory).isInstanceOf(HttpComponentsClientHttpRequestFactory.class);
+	}
+
+	@AfterEach
+	void shutdown() {
+		transportClientFactory.shutdown();
+	}
+
+}

spring-cloud-netflix-eureka-client/src/test/java/org/springframework/cloud/netflix/eureka/http/WebClientEurekaHttpClientTests.java

@@ -48,7 +48,7 @@ class WebClientEurekaHttpClientTests extends AbstractEurekaHttpClientTests {
 	@BeforeEach
 	void setup() {
 		eurekaHttpClient = new WebClientTransportClientFactory(WebClient::builder)
-				.newClient(new DefaultEndpoint(serviceUrl));
+			.newClient(new DefaultEndpoint(serviceUrl));
 
 		EurekaInstanceConfigBean config = new EurekaInstanceConfigBean(inetUtils);
 

spring-cloud-netflix-eureka-client/src/test/java/org/springframework/cloud/netflix/eureka/http/WebClientTransportClientFactoryTest.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2017-2022 the original author or authors.
+ * Copyright 2017-2024 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -16,23 +16,57 @@
 
 package org.springframework.cloud.netflix.eureka.http;
 
+import java.time.Duration;
+
 import com.netflix.discovery.shared.resolver.DefaultEndpoint;
 import org.junit.jupiter.api.AfterEach;
 import org.junit.jupiter.api.BeforeEach;
 import org.junit.jupiter.api.Test;
+import org.mockito.ArgumentCaptor;
+import org.mockito.Captor;
+import org.mockito.Mock;
+import org.mockito.junit.jupiter.MockitoSettings;
+import org.mockito.quality.Strictness;
+import reactor.core.publisher.Mono;
 
+import org.springframework.http.HttpHeaders;
+import org.springframework.http.HttpStatus;
+import org.springframework.web.reactive.function.client.ClientRequest;
+import org.springframework.web.reactive.function.client.ClientResponse;
+import org.springframework.web.reactive.function.client.ExchangeFunction;
 import org.springframework.web.reactive.function.client.WebClient;
 
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.mockito.BDDMockito.given;
+import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.verify;
+import static org.mockito.Mockito.verifyNoMoreInteractions;
+import static org.mockito.Mockito.when;
+
 /**
  * @author Daniel Lavoie
+ * @author Armin Krezovic
  */
+@MockitoSettings(strictness = Strictness.LENIENT)
 class WebClientTransportClientFactoryTest {
 
+	@Mock
+	private ExchangeFunction exchangeFunction;
+
+	@Captor
+	private ArgumentCaptor<ClientRequest> captor;
+
 	private WebClientTransportClientFactory transportClientFatory;
 
 	@BeforeEach
 	void setup() {
-		transportClientFatory = new WebClientTransportClientFactory(WebClient::builder);
+		ClientResponse mockResponse = mock();
+		when(mockResponse.statusCode()).thenReturn(HttpStatus.OK);
+		when(mockResponse.bodyToMono(Void.class)).thenReturn(Mono.empty());
+		given(exchangeFunction.exchange(captor.capture())).willReturn(Mono.just(mockResponse));
+
+		transportClientFatory = new WebClientTransportClientFactory(
+				() -> WebClient.builder().exchangeFunction(exchangeFunction));
 	}
 
 	@Test
@@ -45,6 +79,23 @@ class WebClientTransportClientFactoryTest {
 		transportClientFatory.newClient(new DefaultEndpoint("http://test@localhost:8761"));
 	}
 
+	@Test
+	void testUserInfoWithEncodedCharacters() {
+		String encodedBasicAuth = HttpHeaders.encodeBasicAuth("test", "MyPassword@", null);
+		String expectedAuthHeader = "Basic " + encodedBasicAuth;
+		String expectedUrl = "http://localhost:8761";
+
+		WebClientEurekaHttpClient client = (WebClientEurekaHttpClient) transportClientFatory
+			.newClient(new DefaultEndpoint("http://test:MyPassword%40@localhost:8761"));
+
+		client.getWebClient().get().retrieve().bodyToMono(Void.class).block(Duration.ofSeconds(10));
+
+		ClientRequest request = verifyAndGetRequest();
+
+		assertThat(request.headers().getFirst(HttpHeaders.AUTHORIZATION)).isEqualTo(expectedAuthHeader);
+		assertThat(request.url().toString()).isEqualTo(expectedUrl);
+	}
+
 	@Test
 	void testUserInfo() {
 		transportClientFatory.newClient(new DefaultEndpoint("http://test:test@localhost:8761"));
@@ -55,4 +106,11 @@ class WebClientTransportClientFactoryTest {
 		transportClientFatory.shutdown();
 	}
 
+	private ClientRequest verifyAndGetRequest() {
+		ClientRequest request = captor.getValue();
+		verify(exchangeFunction).exchange(request);
+		verifyNoMoreInteractions(exchangeFunction);
+		return request;
+	}
+
 }

spring-cloud-netflix-eureka-client/src/test/java/org/springframework/cloud/netflix/eureka/loadbalancer/EurekaLoadBalancerClientConfigurationTests.java

@@ -76,11 +76,12 @@ class EurekaLoadBalancerClientConfigurationTests {
 	@Test
 	void disabledViaProperty() {
 		new ApplicationContextRunner()
-				.withConfiguration(AutoConfigurations.of(LoadBalancerEurekaAutoConfiguration.class))
-				.withPropertyValues("eureka.client.enabled=false").run(context -> {
-					assertThat(context).doesNotHaveBean(EurekaLoadBalancerProperties.class);
-					assertThat(context).doesNotHaveBean(LoadBalancerZoneConfig.class);
-				});
+			.withConfiguration(AutoConfigurations.of(LoadBalancerEurekaAutoConfiguration.class))
+			.withPropertyValues("eureka.client.enabled=false")
+			.run(context -> {
+				assertThat(context).doesNotHaveBean(EurekaLoadBalancerProperties.class);
+				assertThat(context).doesNotHaveBean(LoadBalancerZoneConfig.class);
+			});
 	}
 
 }

spring-cloud-netflix-eureka-client/src/test/java/org/springframework/cloud/netflix/eureka/reactive/EurekaReactiveDiscoveryClientConfigurationTests.java

@@ -36,9 +36,9 @@ import static org.assertj.core.api.Assertions.assertThat;
 class EurekaReactiveDiscoveryClientConfigurationTests {
 
 	private final ApplicationContextRunner contextRunner = new ApplicationContextRunner()
-			.withConfiguration(AutoConfigurations.of(UtilAutoConfiguration.class,
-					ReactiveCommonsClientAutoConfiguration.class, EurekaClientAutoConfiguration.class,
-					DiscoveryClientOptionalArgsConfiguration.class, EurekaReactiveDiscoveryClientConfiguration.class));
+		.withConfiguration(AutoConfigurations.of(UtilAutoConfiguration.class,
+				ReactiveCommonsClientAutoConfiguration.class, EurekaClientAutoConfiguration.class,
+				DiscoveryClientOptionalArgsConfiguration.class, EurekaReactiveDiscoveryClientConfiguration.class));
 
 	@Test
 	void shouldWorkWithDefaults() {

spring-cloud-netflix-eureka-client/src/test/java/org/springframework/cloud/netflix/eureka/serviceregistry/EurekaServiceRegistryTests.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2013-2022 the original author or authors.
+ * Copyright 2013-2024 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -16,14 +16,20 @@
 
 package org.springframework.cloud.netflix.eureka.serviceregistry;
 
+import java.time.Duration;
 import java.util.Map;
+import java.util.concurrent.atomic.AtomicBoolean;
 
 import com.netflix.appinfo.ApplicationInfoManager;
 import com.netflix.appinfo.InstanceInfo;
 import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.extension.ExtendWith;
+import org.mockito.Mock;
+import org.mockito.junit.jupiter.MockitoExtension;
 
 import org.springframework.cloud.commons.util.InetUtils;
 import org.springframework.cloud.commons.util.InetUtilsProperties;
+import org.springframework.cloud.loadbalancer.support.SimpleObjectProvider;
 import org.springframework.cloud.netflix.eureka.CloudEurekaClient;
 import org.springframework.cloud.netflix.eureka.EurekaClientConfigBean;
 import org.springframework.cloud.netflix.eureka.EurekaInstanceConfigBean;
@@ -33,16 +39,24 @@ import static com.netflix.appinfo.InstanceInfo.InstanceStatus.DOWN;
 import static com.netflix.appinfo.InstanceInfo.InstanceStatus.OUT_OF_SERVICE;
 import static com.netflix.appinfo.InstanceInfo.InstanceStatus.UNKNOWN;
 import static org.assertj.core.api.Assertions.assertThat;
+import static org.awaitility.Awaitility.await;
 import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.never;
+import static org.mockito.Mockito.verify;
 import static org.mockito.Mockito.verifyNoInteractions;
 import static org.mockito.Mockito.when;
 
 /**
  * @author Spencer Gibb
  * @author Tim Ysewyn
+ * @author Robert Bleyl
  */
+@ExtendWith(MockitoExtension.class)
 class EurekaServiceRegistryTests {
 
+	@Mock
+	private EurekaInstanceConfigBean eurekaInstanceConfigBean;
+
 	@Test
 	void eurekaClientNotShutdownInDeregister() {
 		EurekaServiceRegistry registry = new EurekaServiceRegistry();
@@ -53,9 +67,11 @@ class EurekaServiceRegistryTests {
 		when(applicationInfoManager.getInfo()).thenReturn(mock(InstanceInfo.class));
 
 		EurekaRegistration registration = EurekaRegistration
-				.builder(new EurekaInstanceConfigBean(new InetUtils(new InetUtilsProperties()))).with(eurekaClient)
-				.with(applicationInfoManager).with(new EurekaClientConfigBean(), mock(ApplicationEventPublisher.class))
-				.build();
+			.builder(new EurekaInstanceConfigBean(new InetUtils(new InetUtilsProperties())))
+			.with(eurekaClient)
+			.with(applicationInfoManager)
+			.with(new EurekaClientConfigBean(), mock(ApplicationEventPublisher.class))
+			.build();
 
 		registry.deregister(registration);
 
@@ -71,11 +87,18 @@ class EurekaServiceRegistryTests {
 		config.setAppname("myapp");
 		config.setInstanceId("1234");
 
-		InstanceInfo local = InstanceInfo.Builder.newBuilder().setAppName("myapp").setInstanceId("1234").setStatus(DOWN)
-				.build();
+		InstanceInfo local = InstanceInfo.Builder.newBuilder()
+			.setAppName("myapp")
+			.setInstanceId("1234")
+			.setStatus(DOWN)
+			.build();
 
-		InstanceInfo remote = InstanceInfo.Builder.newBuilder().setAppName("myapp").setInstanceId("1234")
-				.setStatus(DOWN).setOverriddenStatus(OUT_OF_SERVICE).build();
+		InstanceInfo remote = InstanceInfo.Builder.newBuilder()
+			.setAppName("myapp")
+			.setInstanceId("1234")
+			.setStatus(DOWN)
+			.setOverriddenStatus(OUT_OF_SERVICE)
+			.build();
 
 		CloudEurekaClient eurekaClient = mock(CloudEurekaClient.class);
 		when(eurekaClient.getInstanceInfo(local.getAppName(), local.getId())).thenReturn(remote);
@@ -83,9 +106,11 @@ class EurekaServiceRegistryTests {
 		ApplicationInfoManager applicationInfoManager = mock(ApplicationInfoManager.class);
 		when(applicationInfoManager.getInfo()).thenReturn(local);
 
-		EurekaRegistration registration = EurekaRegistration.builder(config).with(eurekaClient)
-				.with(applicationInfoManager).with(new EurekaClientConfigBean(), mock(ApplicationEventPublisher.class))
-				.build();
+		EurekaRegistration registration = EurekaRegistration.builder(config)
+			.with(eurekaClient)
+			.with(applicationInfoManager)
+			.with(new EurekaClientConfigBean(), mock(ApplicationEventPublisher.class))
+			.build();
 
 		Object status = registry.getStatus(registration);
 
@@ -95,8 +120,9 @@ class EurekaServiceRegistryTests {
 
 		Map<Object, Object> map = (Map<Object, Object>) status;
 
-		assertThat(map).hasSize(2).containsEntry("status", DOWN.toString()).containsEntry("overriddenStatus",
-				OUT_OF_SERVICE.toString());
+		assertThat(map).hasSize(2)
+			.containsEntry("status", DOWN.toString())
+			.containsEntry("overriddenStatus", OUT_OF_SERVICE.toString());
 	}
 
 	@SuppressWarnings("unchecked")
@@ -110,14 +136,14 @@ class EurekaServiceRegistryTests {
 
 		CloudEurekaClient eurekaClient = mock(CloudEurekaClient.class);
 
-		when(eurekaClient.getInstanceInfo("myapp", "1234")).thenReturn(null);
-
 		ApplicationInfoManager applicationInfoManager = mock(ApplicationInfoManager.class);
 		when(applicationInfoManager.getInfo()).thenReturn(mock(InstanceInfo.class));
 
-		EurekaRegistration registration = EurekaRegistration.builder(config).with(eurekaClient)
-				.with(applicationInfoManager).with(new EurekaClientConfigBean(), mock(ApplicationEventPublisher.class))
-				.build();
+		EurekaRegistration registration = EurekaRegistration.builder(config)
+			.with(eurekaClient)
+			.with(applicationInfoManager)
+			.with(new EurekaClientConfigBean(), mock(ApplicationEventPublisher.class))
+			.build();
 
 		Object status = registry.getStatus(registration);
 
@@ -130,4 +156,60 @@ class EurekaServiceRegistryTests {
 		assertThat(map).hasSize(1).containsEntry("status", UNKNOWN.toString());
 	}
 
+	@Test
+	void eurekaClientInitializesClientAsynchronously() {
+		when(eurekaInstanceConfigBean.isAsyncClientInitialization()).thenReturn(true);
+		EurekaServiceRegistry registry = new EurekaServiceRegistry(eurekaInstanceConfigBean);
+
+		final AtomicBoolean applicationsFetched = new AtomicBoolean();
+
+		CloudEurekaClient eurekaClient = mock(CloudEurekaClient.class);
+		when(eurekaClient.getApplications()).thenAnswer((answer) -> {
+			applicationsFetched.set(true);
+			return answer;
+		});
+
+		ApplicationInfoManager applicationInfoManager = mock(ApplicationInfoManager.class);
+
+		when(applicationInfoManager.getInfo()).thenReturn(mock(InstanceInfo.class));
+
+		EurekaRegistration registration = EurekaRegistration
+			.builder(new EurekaInstanceConfigBean(new InetUtils(new InetUtilsProperties())))
+			.with(eurekaClient)
+			.with(applicationInfoManager)
+			.with(new EurekaClientConfigBean(), mock(ApplicationEventPublisher.class))
+			.with(new SimpleObjectProvider<>(null))
+			.build();
+
+		registry.register(registration);
+
+		await().atMost(Duration.ofSeconds(5)).pollInterval(Duration.ofMillis(500)).until(applicationsFetched::get);
+
+		verify(eurekaClient).getApplications();
+		assertThat(applicationsFetched).isTrue();
+	}
+
+	@Test
+	void eurekaClientInitializesClientSynchronously() {
+		EurekaServiceRegistry registry = new EurekaServiceRegistry(eurekaInstanceConfigBean);
+
+		CloudEurekaClient eurekaClient = mock(CloudEurekaClient.class);
+		ApplicationInfoManager applicationInfoManager = mock(ApplicationInfoManager.class);
+
+		when(applicationInfoManager.getInfo()).thenReturn(mock(InstanceInfo.class));
+
+		EurekaRegistration registration = EurekaRegistration
+			.builder(new EurekaInstanceConfigBean(new InetUtils(new InetUtilsProperties())))
+			.with(eurekaClient)
+			.with(applicationInfoManager)
+			.with(new EurekaClientConfigBean(), mock(ApplicationEventPublisher.class))
+			.with(new SimpleObjectProvider<>(null))
+			.build();
+
+		registry.register(registration);
+
+		verify(eurekaClient).getApplications();
+		verify(eurekaClient, never()).getEurekaClientConfig();
+	}
+
 }

spring-cloud-netflix-eureka-server/pom.xml

@@ -5,7 +5,7 @@
 	<parent>
 		<groupId>org.springframework.cloud</groupId>
 		<artifactId>spring-cloud-netflix</artifactId>
-		<version>4.1.1-SNAPSHOT</version>
+		<version>4.2.2</version>
 		<relativePath>..</relativePath> <!-- lookup parent from repository -->
 	</parent>
 	<artifactId>spring-cloud-netflix-eureka-server</artifactId>
@@ -14,8 +14,6 @@
 	<properties>
 		<wro4j.version>1.10.1</wro4j.version>
 		<wiremock.version>2.27.2</wiremock.version>
-		<!-- FIXME: 4.0.0 -->
-		<duplicate-finder-maven-plugin.skip>true</duplicate-finder-maven-plugin.skip>
 	</properties>
 	<dependencies>
 		<dependency>
@@ -71,18 +69,18 @@
 		<dependency>
 			<groupId>org.glassfish.jersey.inject</groupId>
 			<artifactId>jersey-hk2</artifactId>
+			<exclusions>
+				<exclusion>
+					<groupId>org.glassfish.hk2.external</groupId>
+					<artifactId>aopalliance-repackaged</artifactId>
+				</exclusion>
+			</exclusions>
 		</dependency>
 		<dependency>
 			<groupId>org.glassfish.hk2</groupId>
 			<artifactId>spring-bridge</artifactId>
 			<!-- FIXME: 4.0 -->
-			<version>3.0.5</version>
-		</dependency>
-		<dependency>
-			<groupId>jakarta.inject</groupId>
-			<artifactId>jakarta.inject-api</artifactId>
-			<!-- FIXME: 4.0 -->
-			<version>2.0.1</version>
+			<version>3.1.1</version>
 		</dependency>
 		<!-- Eureka deps that are now optional in eureka -->
 		<dependency>
@@ -100,8 +98,13 @@
 			<scope>test</scope>
 		</dependency>
 		<dependency>
-            <groupId>org.springframework.security</groupId>
-            <artifactId>spring-security-rsa</artifactId>
+            <groupId>org.springframework.cloud</groupId>
+            <artifactId>spring-cloud-starter</artifactId>
+			<scope>test</scope>
+		</dependency>
+		<dependency>
+			<groupId>org.awaitility</groupId>
+			<artifactId>awaitility</artifactId>
 			<scope>test</scope>
 		</dependency>
 	</dependencies>

spring-cloud-netflix-eureka-server/src/main/java/org/springframework/cloud/netflix/eureka/server/EurekaController.java

@@ -201,7 +201,7 @@ public class EurekaController {
 			ArrayList<Map<String, Object>> instanceInfos = new ArrayList<>();
 			appData.put("instanceInfos", instanceInfos);
 			for (Map.Entry<InstanceInfo.InstanceStatus, List<Pair<String, String>>> entry : instancesByStatus
-					.entrySet()) {
+				.entrySet()) {
 				List<Pair<String, String>> value = entry.getValue();
 				InstanceInfo.InstanceStatus status = entry.getKey();
 				LinkedHashMap<String, Object> instanceData = new LinkedHashMap<>();

spring-cloud-netflix-eureka-server/src/main/java/org/springframework/cloud/netflix/eureka/server/EurekaServerAutoConfiguration.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2013-2022 the original author or authors.
+ * Copyright 2013-2024 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -25,21 +25,19 @@ import java.util.Collection;
 import java.util.Collections;
 import java.util.HashSet;
 import java.util.Set;
+import java.util.concurrent.ExecutorService;
+import java.util.concurrent.Executors;
 import java.util.regex.Pattern;
 
 import com.netflix.appinfo.ApplicationInfoManager;
-import com.netflix.discovery.AbstractDiscoveryClientOptionalArgs;
 import com.netflix.discovery.EurekaClient;
 import com.netflix.discovery.EurekaClientConfig;
-import com.netflix.discovery.Jersey3DiscoveryClientOptionalArgs;
 import com.netflix.discovery.converters.EurekaJacksonCodec;
 import com.netflix.discovery.converters.wrappers.CodecWrapper;
 import com.netflix.discovery.converters.wrappers.CodecWrappers;
-import com.netflix.discovery.shared.transport.jersey.TransportClientFactories;
 import com.netflix.discovery.shared.transport.jersey3.EurekaIdentityHeaderFilter;
 import com.netflix.discovery.shared.transport.jersey3.EurekaJersey3Client;
 import com.netflix.discovery.shared.transport.jersey3.EurekaJersey3ClientImpl;
-import com.netflix.discovery.shared.transport.jersey3.Jersey3TransportClientFactories;
 import com.netflix.eureka.DefaultEurekaServerContext;
 import com.netflix.eureka.EurekaServerConfig;
 import com.netflix.eureka.EurekaServerContext;
@@ -51,7 +49,6 @@ import com.netflix.eureka.resources.DefaultServerCodecs;
 import com.netflix.eureka.resources.ServerCodecs;
 import com.netflix.eureka.transport.EurekaServerHttpClientFactory;
 import com.netflix.eureka.transport.Jersey3DynamicGZIPContentEncodingFilter;
-import com.netflix.eureka.transport.Jersey3EurekaServerHttpClientFactory;
 import com.netflix.eureka.transport.Jersey3ReplicationClient;
 import jakarta.servlet.Filter;
 import jakarta.servlet.FilterChain;
@@ -88,6 +85,7 @@ import org.springframework.boot.web.servlet.FilterRegistrationBean;
 import org.springframework.cloud.client.actuator.HasFeatures;
 import org.springframework.cloud.context.environment.EnvironmentChangeEvent;
 import org.springframework.cloud.netflix.eureka.EurekaConstants;
+import org.springframework.cloud.netflix.eureka.EurekaInstanceConfigBean;
 import org.springframework.context.ApplicationListener;
 import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.ClassPathScanningCandidateComponentProvider;
@@ -108,6 +106,8 @@ import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;
  * @author Biju Kunjummen
  * @author Fahim Farook
  * @author Weix Sun
+ * @author Robert Bleyl
+ * @author Olga Maciaszek-Sharma
  */
 @Configuration(proxyBeanMethods = false)
 @Import(EurekaServerInitializerConfiguration.class)
@@ -186,29 +186,27 @@ public class EurekaServerAutoConfiguration implements WebMvcConfigurer {
 		return new ReplicationClientAdditionalFilters(Collections.emptySet());
 	}
 
-	@Bean
-	@ConditionalOnMissingBean(TransportClientFactories.class)
-	public Jersey3TransportClientFactories jersey3TransportClientFactories() {
-		return Jersey3TransportClientFactories.getInstance();
-	}
-
-	@SuppressWarnings({ "rawtypes", "unchecked" })
-	@Bean
-	@ConditionalOnMissingBean(EurekaServerHttpClientFactory.class)
-	public Jersey3EurekaServerHttpClientFactory jersey3EurekaServerHttpClientFactory() {
-		return new Jersey3EurekaServerHttpClientFactory();
-	}
-
-	@Bean
-	@ConditionalOnMissingBean(AbstractDiscoveryClientOptionalArgs.class)
-	public Jersey3DiscoveryClientOptionalArgs jersey3DiscoveryClientOptionalArgs() {
-		return new Jersey3DiscoveryClientOptionalArgs();
-	}
-
 	@Bean
 	public PeerAwareInstanceRegistry peerAwareInstanceRegistry(ServerCodecs serverCodecs,
-			EurekaServerHttpClientFactory eurekaServerHttpClientFactory) {
-		this.eurekaClient.getApplications(); // force initialization
+			EurekaServerHttpClientFactory eurekaServerHttpClientFactory,
+			EurekaInstanceConfigBean eurekaInstanceConfigBean) {
+		if (eurekaInstanceConfigBean.isAsyncClientInitialization()) {
+			if (log.isDebugEnabled()) {
+				log.debug("Initializing client asynchronously...");
+			}
+
+			ExecutorService executorService = Executors.newSingleThreadExecutor();
+			executorService.submit(() -> {
+				this.eurekaClient.getApplications();
+				if (log.isDebugEnabled()) {
+					log.debug("Asynchronous client initialization done.");
+				}
+			});
+		}
+		else {
+			this.eurekaClient.getApplications(); // force initialization
+		}
+
 		return new InstanceRegistry(this.eurekaServerConfig, this.eurekaClientConfig, serverCodecs, this.eurekaClient,
 				eurekaServerHttpClientFactory,
 				this.instanceRegistryProperties.getExpectedNumberOfClientsSendingRenews(),
@@ -352,8 +350,9 @@ public class EurekaServerAutoConfiguration implements WebMvcConfigurer {
 		rc.register(new ContainerLifecycleListener() {
 			@Override
 			public void onStartup(Container container) {
-				ServiceLocator serviceLocator = container.getApplicationHandler().getInjectionManager()
-						.getInstance(ServiceLocator.class);
+				ServiceLocator serviceLocator = container.getApplicationHandler()
+					.getInjectionManager()
+					.getInstance(ServiceLocator.class);
 				SpringBridge.getSpringBridge().initializeSpringBridge(serviceLocator);
 				serviceLocator.getService(SpringIntoHK2Bridge.class).bridgeSpringBeanFactory(beanFactory);
 			}
@@ -452,17 +451,18 @@ public class EurekaServerAutoConfiguration implements WebMvcConfigurer {
 
 				String jerseyClientName = "Discovery-PeerNodeClient-" + hostname;
 				EurekaJersey3ClientImpl.EurekaJersey3ClientBuilder clientBuilder = new EurekaJersey3ClientImpl.EurekaJersey3ClientBuilder()
-						.withClientName(jerseyClientName).withUserAgent("Java-EurekaClient-Replication")
-						.withEncoderWrapper(serverCodecs.getFullJsonCodec())
-						.withDecoderWrapper(serverCodecs.getFullJsonCodec())
-						.withConnectionTimeout(config.getPeerNodeConnectTimeoutMs())
-						.withReadTimeout(config.getPeerNodeReadTimeoutMs())
-						.withMaxConnectionsPerHost(config.getPeerNodeTotalConnectionsPerHost())
-						.withMaxTotalConnections(config.getPeerNodeTotalConnections())
-						.withConnectionIdleTimeout(config.getPeerNodeConnectionIdleTimeoutSeconds());
+					.withClientName(jerseyClientName)
+					.withUserAgent("Java-EurekaClient-Replication")
+					.withEncoderWrapper(serverCodecs.getFullJsonCodec())
+					.withDecoderWrapper(serverCodecs.getFullJsonCodec())
+					.withConnectionTimeout(config.getPeerNodeConnectTimeoutMs())
+					.withReadTimeout(config.getPeerNodeReadTimeoutMs())
+					.withMaxConnectionsPerHost(config.getPeerNodeTotalConnectionsPerHost())
+					.withMaxTotalConnections(config.getPeerNodeTotalConnections())
+					.withConnectionIdleTimeout(config.getPeerNodeConnectionIdleTimeoutSeconds());
 
 				if (serviceUrl.startsWith("https://") && "true"
-						.equals(System.getProperty("com.netflix.eureka.shouldSSLConnectionsUseSystemSocketFactory"))) {
+					.equals(System.getProperty("com.netflix.eureka.shouldSSLConnectionsUseSystemSocketFactory"))) {
 					clientBuilder.withSystemSSLConfiguration();
 				}
 				jerseyClient = clientBuilder.build();

spring-cloud-netflix-eureka-server/src/main/java/org/springframework/cloud/netflix/eureka/server/EurekaServerConfigBean.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2013-2022 the original author or authors.
+ * Copyright 2013-2024 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -19,6 +19,7 @@ package org.springframework.cloud.netflix.eureka.server;
 import java.util.Arrays;
 import java.util.Collections;
 import java.util.HashMap;
+import java.util.Locale;
 import java.util.Map;
 import java.util.Objects;
 import java.util.Set;
@@ -34,6 +35,7 @@ import org.springframework.core.style.ToStringCreator;
 /**
  * @author Dave Syer
  * @author Gregor Zurowski
+ * @author Mooyong Lee
  */
 @ConfigurationProperties(EurekaServerConfigBean.PREFIX)
 public class EurekaServerConfigBean implements EurekaServerConfig {
@@ -43,8 +45,6 @@ public class EurekaServerConfigBean implements EurekaServerConfig {
 	 */
 	public static final String PREFIX = "eureka.server";
 
-	private static final int MINUTES = 60 * 1000;
-
 	@Autowired(required = false)
 	PropertyResolver propertyResolver;
 
@@ -54,23 +54,23 @@ public class EurekaServerConfigBean implements EurekaServerConfig {
 
 	private int eIPBindRebindRetries = 3;
 
-	private int eIPBindingRetryIntervalMs = 5 * MINUTES;
+	private int eIPBindingRetryIntervalMs = 300000; // 5 * MINUTES
 
-	private int eIPBindingRetryIntervalMsWhenUnbound = 1 * MINUTES;
+	private int eIPBindingRetryIntervalMsWhenUnbound = 60000; // 1 * MINUTES
 
 	private boolean enableSelfPreservation = true;
 
 	private double renewalPercentThreshold = 0.85;
 
-	private int renewalThresholdUpdateIntervalMs = 15 * MINUTES;
+	private int renewalThresholdUpdateIntervalMs = 900000; // 15 * MINUTES
 
-	private int peerEurekaNodesUpdateIntervalMs = 10 * MINUTES;
+	private int peerEurekaNodesUpdateIntervalMs = 600000; // 10 * MINUTES
 
 	private int numberOfReplicationRetries = 5;
 
 	private int peerEurekaStatusRefreshTimeIntervalMs = 30 * 1000;
 
-	private int waitTimeInMsWhenSyncEmpty = 5 * MINUTES;
+	private int waitTimeInMsWhenSyncEmpty = 300000; // 5 * MINUTES
 
 	private int peerNodeConnectTimeoutMs = 200;
 
@@ -82,23 +82,24 @@ public class EurekaServerConfigBean implements EurekaServerConfig {
 
 	private int peerNodeConnectionIdleTimeoutSeconds = 30;
 
-	private long retentionTimeInMSInDeltaQueue = 3 * MINUTES;
+	private long retentionTimeInMSInDeltaQueue = 180000; // 3 * MINUTES
 
-	private long deltaRetentionTimerIntervalInMs = 30 * 1000;
+	private long deltaRetentionTimerIntervalInMs = 30000; // 30 * SECONDS
 
 	private long evictionIntervalTimerInMs = 60 * 1000;
 
 	private int aSGQueryTimeoutMs = 300;
 
-	private long aSGUpdateIntervalMs = 5 * MINUTES;
+	private long aSGUpdateIntervalMs = 300000; // 5 * MINUTES
 
-	private long aSGCacheExpiryTimeoutMs = 10 * MINUTES; // defaults to longer than the
+	private long aSGCacheExpiryTimeoutMs = 600000; // 10 * MINUTES // defaults to longer
+													// than the
 
 	// asg update interval
 
 	private long responseCacheAutoExpirationInSeconds = 180;
 
-	private long responseCacheUpdateIntervalMs = 30 * 1000;
+	private long responseCacheUpdateIntervalMs = 30000; // 30 * SECONDS
 
 	private boolean useReadOnlyResponseCache = true;
 
@@ -186,7 +187,7 @@ public class EurekaServerConfigBean implements EurekaServerConfig {
 
 	private int route53BindRebindRetries = 3;
 
-	private int route53BindingRetryIntervalMs = 5 * MINUTES;
+	private int route53BindingRetryIntervalMs = 300000; // 5 * MINUTES
 
 	private long route53DomainTTL = 30;
 
@@ -234,7 +235,8 @@ public class EurekaServerConfigBean implements EurekaServerConfig {
 
 	@Override
 	public Set<String> getRemoteRegionAppWhitelist(String regionName) {
-		return this.remoteRegionAppWhitelist.get(regionName == null ? "global" : regionName.trim().toLowerCase());
+		return this.remoteRegionAppWhitelist
+			.get(regionName == null ? "global" : regionName.trim().toLowerCase(Locale.ROOT));
 	}
 
 	@Override
@@ -1060,80 +1062,83 @@ public class EurekaServerConfigBean implements EurekaServerConfig {
 	@Override
 	public String toString() {
 		return new ToStringCreator(this).append("aSGCacheExpiryTimeoutMs", this.aSGCacheExpiryTimeoutMs)
-				.append("aSGQueryTimeoutMs", this.aSGQueryTimeoutMs)
-				.append("aSGUpdateIntervalMs", this.aSGUpdateIntervalMs).append("aWSAccessId", this.aWSAccessId)
-				.append("aWSSecretKey", this.aWSSecretKey).append("batchReplication", this.batchReplication)
-				.append("bindingStrategy", this.bindingStrategy)
-				.append("deltaRetentionTimerIntervalInMs", this.deltaRetentionTimerIntervalInMs)
-				.append("disableDelta", this.disableDelta)
-				.append("disableDeltaForRemoteRegions", this.disableDeltaForRemoteRegions)
-				.append("disableTransparentFallbackToOtherRegion", this.disableTransparentFallbackToOtherRegion)
-				.append("eIPBindRebindRetries", this.eIPBindRebindRetries)
-				.append("eIPBindingRetryIntervalMs", this.eIPBindingRetryIntervalMs)
-				.append("eIPBindingRetryIntervalMsWhenUnbound", this.eIPBindingRetryIntervalMsWhenUnbound)
-				.append("enableReplicatedRequestCompression", this.enableReplicatedRequestCompression)
-				.append("enableSelfPreservation", this.enableSelfPreservation)
-				.append("evictionIntervalTimerInMs", this.evictionIntervalTimerInMs)
-				.append("gZipContentFromRemoteRegion", this.gZipContentFromRemoteRegion)
-				.append("jsonCodecName", this.jsonCodecName)
-				.append("listAutoScalingGroupsRoleName", this.listAutoScalingGroupsRoleName)
-				.append("logIdentityHeaders", this.logIdentityHeaders)
-				.append("maxElementsInPeerReplicationPool", this.maxElementsInPeerReplicationPool)
-				.append("maxElementsInStatusReplicationPool", this.maxElementsInStatusReplicationPool)
-				.append("maxIdleThreadAgeInMinutesForPeerReplication", this.maxIdleThreadAgeInMinutesForPeerReplication)
-				.append("maxIdleThreadInMinutesAgeForStatusReplication",
-						this.maxIdleThreadInMinutesAgeForStatusReplication)
-				.append("maxThreadsForPeerReplication", this.maxThreadsForPeerReplication)
-				.append("maxThreadsForStatusReplication", this.maxThreadsForStatusReplication)
-				.append("maxTimeForReplication", this.maxTimeForReplication)
-				.append("minAvailableInstancesForPeerReplication", this.minAvailableInstancesForPeerReplication)
-				.append("minThreadsForPeerReplication", this.minThreadsForPeerReplication)
-				.append("minThreadsForStatusReplication", this.minThreadsForStatusReplication)
-				.append("numberOfReplicationRetries", this.numberOfReplicationRetries)
-				.append("peerEurekaNodesUpdateIntervalMs", this.peerEurekaNodesUpdateIntervalMs)
-				.append("peerEurekaStatusRefreshTimeIntervalMs", this.peerEurekaStatusRefreshTimeIntervalMs)
-				.append("peerNodeConnectTimeoutMs", this.peerNodeConnectTimeoutMs)
-				.append("peerNodeConnectionIdleTimeoutSeconds", this.peerNodeConnectionIdleTimeoutSeconds)
-				.append("peerNodeReadTimeoutMs", this.peerNodeReadTimeoutMs)
-				.append("peerNodeTotalConnections", this.peerNodeTotalConnections)
-				.append("peerNodeTotalConnectionsPerHost", this.peerNodeTotalConnectionsPerHost)
-				.append("primeAwsReplicaConnections", this.primeAwsReplicaConnections)
-				.append("propertyResolver", this.propertyResolver)
-				.append("rateLimiterBurstSize", this.rateLimiterBurstSize)
-				.append("rateLimiterEnabled", this.rateLimiterEnabled)
-				.append("rateLimiterFullFetchAverageRate", this.rateLimiterFullFetchAverageRate)
-				.append("rateLimiterPrivilegedClients", this.rateLimiterPrivilegedClients)
-				.append("rateLimiterRegistryFetchAverageRate", this.rateLimiterRegistryFetchAverageRate)
-				.append("rateLimiterThrottleStandardClients", this.rateLimiterThrottleStandardClients)
-				.append("registrySyncRetries", this.registrySyncRetries)
-				.append("registrySyncRetryWaitMs", this.registrySyncRetryWaitMs)
-				.append("remoteRegionAppWhitelist", this.remoteRegionAppWhitelist)
-				.append("remoteRegionConnectTimeoutMs", this.remoteRegionConnectTimeoutMs)
-				.append("remoteRegionConnectionIdleTimeoutSeconds", this.remoteRegionConnectionIdleTimeoutSeconds)
-				.append("remoteRegionFetchThreadPoolSize", this.remoteRegionFetchThreadPoolSize)
-				.append("remoteRegionReadTimeoutMs", this.remoteRegionReadTimeoutMs)
-				.append("remoteRegionRegistryFetchInterval", this.remoteRegionRegistryFetchInterval)
-				.append("remoteRegionTotalConnections", this.remoteRegionTotalConnections)
-				.append("remoteRegionTotalConnectionsPerHost", this.remoteRegionTotalConnectionsPerHost)
-				.append("remoteRegionTrustStore", this.remoteRegionTrustStore)
-				.append("remoteRegionTrustStorePassword", this.remoteRegionTrustStorePassword)
-				.append("remoteRegionUrls", this.remoteRegionUrls)
-				.append("remoteRegionUrlsWithName", this.remoteRegionUrlsWithName)
-				.append("renewalPercentThreshold", this.renewalPercentThreshold)
-				.append("renewalThresholdUpdateIntervalMs", this.renewalThresholdUpdateIntervalMs)
-				.append("responseCacheAutoExpirationInSeconds", this.responseCacheAutoExpirationInSeconds)
-				.append("responseCacheUpdateIntervalMs", this.responseCacheUpdateIntervalMs)
-				.append("retentionTimeInMSInDeltaQueue", this.retentionTimeInMSInDeltaQueue)
-				.append("route53BindRebindRetries", this.route53BindRebindRetries)
-				.append("route53BindingRetryIntervalMs", this.route53BindingRetryIntervalMs)
-				.append("route53DomainTTL", this.route53DomainTTL)
-				.append("syncWhenTimestampDiffers", this.syncWhenTimestampDiffers)
-				.append("useReadOnlyResponseCache", this.useReadOnlyResponseCache)
-				.append("waitTimeInMsWhenSyncEmpty", this.waitTimeInMsWhenSyncEmpty)
-				.append("xmlCodecName", this.xmlCodecName)
-				.append("initialCapacityOfResponseCache", this.initialCapacityOfResponseCache)
-				.append("expectedClientRenewalIntervalSeconds", this.expectedClientRenewalIntervalSeconds)
-				.append("useAwsAsgApi", this.useAwsAsgApi).append("myUrl", this.myUrl).toString();
+			.append("aSGQueryTimeoutMs", this.aSGQueryTimeoutMs)
+			.append("aSGUpdateIntervalMs", this.aSGUpdateIntervalMs)
+			.append("aWSAccessId", this.aWSAccessId)
+			.append("aWSSecretKey", this.aWSSecretKey)
+			.append("batchReplication", this.batchReplication)
+			.append("bindingStrategy", this.bindingStrategy)
+			.append("deltaRetentionTimerIntervalInMs", this.deltaRetentionTimerIntervalInMs)
+			.append("disableDelta", this.disableDelta)
+			.append("disableDeltaForRemoteRegions", this.disableDeltaForRemoteRegions)
+			.append("disableTransparentFallbackToOtherRegion", this.disableTransparentFallbackToOtherRegion)
+			.append("eIPBindRebindRetries", this.eIPBindRebindRetries)
+			.append("eIPBindingRetryIntervalMs", this.eIPBindingRetryIntervalMs)
+			.append("eIPBindingRetryIntervalMsWhenUnbound", this.eIPBindingRetryIntervalMsWhenUnbound)
+			.append("enableReplicatedRequestCompression", this.enableReplicatedRequestCompression)
+			.append("enableSelfPreservation", this.enableSelfPreservation)
+			.append("evictionIntervalTimerInMs", this.evictionIntervalTimerInMs)
+			.append("gZipContentFromRemoteRegion", this.gZipContentFromRemoteRegion)
+			.append("jsonCodecName", this.jsonCodecName)
+			.append("listAutoScalingGroupsRoleName", this.listAutoScalingGroupsRoleName)
+			.append("logIdentityHeaders", this.logIdentityHeaders)
+			.append("maxElementsInPeerReplicationPool", this.maxElementsInPeerReplicationPool)
+			.append("maxElementsInStatusReplicationPool", this.maxElementsInStatusReplicationPool)
+			.append("maxIdleThreadAgeInMinutesForPeerReplication", this.maxIdleThreadAgeInMinutesForPeerReplication)
+			.append("maxIdleThreadInMinutesAgeForStatusReplication", this.maxIdleThreadInMinutesAgeForStatusReplication)
+			.append("maxThreadsForPeerReplication", this.maxThreadsForPeerReplication)
+			.append("maxThreadsForStatusReplication", this.maxThreadsForStatusReplication)
+			.append("maxTimeForReplication", this.maxTimeForReplication)
+			.append("minAvailableInstancesForPeerReplication", this.minAvailableInstancesForPeerReplication)
+			.append("minThreadsForPeerReplication", this.minThreadsForPeerReplication)
+			.append("minThreadsForStatusReplication", this.minThreadsForStatusReplication)
+			.append("numberOfReplicationRetries", this.numberOfReplicationRetries)
+			.append("peerEurekaNodesUpdateIntervalMs", this.peerEurekaNodesUpdateIntervalMs)
+			.append("peerEurekaStatusRefreshTimeIntervalMs", this.peerEurekaStatusRefreshTimeIntervalMs)
+			.append("peerNodeConnectTimeoutMs", this.peerNodeConnectTimeoutMs)
+			.append("peerNodeConnectionIdleTimeoutSeconds", this.peerNodeConnectionIdleTimeoutSeconds)
+			.append("peerNodeReadTimeoutMs", this.peerNodeReadTimeoutMs)
+			.append("peerNodeTotalConnections", this.peerNodeTotalConnections)
+			.append("peerNodeTotalConnectionsPerHost", this.peerNodeTotalConnectionsPerHost)
+			.append("primeAwsReplicaConnections", this.primeAwsReplicaConnections)
+			.append("propertyResolver", this.propertyResolver)
+			.append("rateLimiterBurstSize", this.rateLimiterBurstSize)
+			.append("rateLimiterEnabled", this.rateLimiterEnabled)
+			.append("rateLimiterFullFetchAverageRate", this.rateLimiterFullFetchAverageRate)
+			.append("rateLimiterPrivilegedClients", this.rateLimiterPrivilegedClients)
+			.append("rateLimiterRegistryFetchAverageRate", this.rateLimiterRegistryFetchAverageRate)
+			.append("rateLimiterThrottleStandardClients", this.rateLimiterThrottleStandardClients)
+			.append("registrySyncRetries", this.registrySyncRetries)
+			.append("registrySyncRetryWaitMs", this.registrySyncRetryWaitMs)
+			.append("remoteRegionAppWhitelist", this.remoteRegionAppWhitelist)
+			.append("remoteRegionConnectTimeoutMs", this.remoteRegionConnectTimeoutMs)
+			.append("remoteRegionConnectionIdleTimeoutSeconds", this.remoteRegionConnectionIdleTimeoutSeconds)
+			.append("remoteRegionFetchThreadPoolSize", this.remoteRegionFetchThreadPoolSize)
+			.append("remoteRegionReadTimeoutMs", this.remoteRegionReadTimeoutMs)
+			.append("remoteRegionRegistryFetchInterval", this.remoteRegionRegistryFetchInterval)
+			.append("remoteRegionTotalConnections", this.remoteRegionTotalConnections)
+			.append("remoteRegionTotalConnectionsPerHost", this.remoteRegionTotalConnectionsPerHost)
+			.append("remoteRegionTrustStore", this.remoteRegionTrustStore)
+			.append("remoteRegionTrustStorePassword", this.remoteRegionTrustStorePassword)
+			.append("remoteRegionUrls", this.remoteRegionUrls)
+			.append("remoteRegionUrlsWithName", this.remoteRegionUrlsWithName)
+			.append("renewalPercentThreshold", this.renewalPercentThreshold)
+			.append("renewalThresholdUpdateIntervalMs", this.renewalThresholdUpdateIntervalMs)
+			.append("responseCacheAutoExpirationInSeconds", this.responseCacheAutoExpirationInSeconds)
+			.append("responseCacheUpdateIntervalMs", this.responseCacheUpdateIntervalMs)
+			.append("retentionTimeInMSInDeltaQueue", this.retentionTimeInMSInDeltaQueue)
+			.append("route53BindRebindRetries", this.route53BindRebindRetries)
+			.append("route53BindingRetryIntervalMs", this.route53BindingRetryIntervalMs)
+			.append("route53DomainTTL", this.route53DomainTTL)
+			.append("syncWhenTimestampDiffers", this.syncWhenTimestampDiffers)
+			.append("useReadOnlyResponseCache", this.useReadOnlyResponseCache)
+			.append("waitTimeInMsWhenSyncEmpty", this.waitTimeInMsWhenSyncEmpty)
+			.append("xmlCodecName", this.xmlCodecName)
+			.append("initialCapacityOfResponseCache", this.initialCapacityOfResponseCache)
+			.append("expectedClientRenewalIntervalSeconds", this.expectedClientRenewalIntervalSeconds)
+			.append("useAwsAsgApi", this.useAwsAsgApi)
+			.append("myUrl", this.myUrl)
+			.toString();
 	}
 
 }

spring-cloud-netflix-eureka-server/src/main/java/org/springframework/cloud/netflix/eureka/server/EurekaServerJerseyClientAutoConfiguration.java

@@ -0,0 +1,68 @@
+/*
+ * Copyright 2013-2025 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.cloud.netflix.eureka.server;
+
+import java.io.IOException;
+import java.security.GeneralSecurityException;
+
+import com.netflix.discovery.AbstractDiscoveryClientOptionalArgs;
+import com.netflix.discovery.Jersey3DiscoveryClientOptionalArgs;
+import com.netflix.discovery.shared.transport.jersey.TransportClientFactories;
+import com.netflix.discovery.shared.transport.jersey3.Jersey3TransportClientFactories;
+import com.netflix.eureka.transport.EurekaServerHttpClientFactory;
+import com.netflix.eureka.transport.Jersey3EurekaServerHttpClientFactory;
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.autoconfigure.AutoConfiguration;
+import org.springframework.boot.autoconfigure.condition.ConditionalOnBean;
+import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean;
+import org.springframework.cloud.configuration.SSLContextFactory;
+import org.springframework.cloud.configuration.TlsProperties;
+import org.springframework.context.annotation.Bean;
+
+/**
+ * @author Olga Maciaszek-Sharma
+ */
+@AutoConfiguration
+@ConditionalOnBean(EurekaServerMarkerConfiguration.Marker.class)
+public class EurekaServerJerseyClientAutoConfiguration {
+
+	@Bean
+	@ConditionalOnMissingBean(AbstractDiscoveryClientOptionalArgs.class)
+	public Jersey3DiscoveryClientOptionalArgs jersey3DiscoveryClientOptionalArgs(
+			@Autowired(required = false) TlsProperties tlsProperties) throws GeneralSecurityException, IOException {
+		Jersey3DiscoveryClientOptionalArgs optionalArgs = new Jersey3DiscoveryClientOptionalArgs();
+		if (tlsProperties != null && tlsProperties.isEnabled()) {
+			SSLContextFactory factory = new SSLContextFactory(tlsProperties);
+			optionalArgs.setSSLContext(factory.createSSLContext());
+		}
+		return optionalArgs;
+	}
+
+	@Bean
+	@ConditionalOnMissingBean(TransportClientFactories.class)
+	public Jersey3TransportClientFactories jersey3TransportClientFactories() {
+		return Jersey3TransportClientFactories.getInstance();
+	}
+
+	@Bean
+	@ConditionalOnMissingBean(EurekaServerHttpClientFactory.class)
+	public Jersey3EurekaServerHttpClientFactory jersey3EurekaServerHttpClientFactory() {
+		return new Jersey3EurekaServerHttpClientFactory();
+	}
+
+}

spring-cloud-netflix-eureka-server/src/main/java/org/springframework/cloud/netflix/eureka/server/InstanceRegistry.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2013-2022 the original author or authors.
+ * Copyright 2013-2024 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -39,6 +39,7 @@ import org.springframework.context.ApplicationEvent;
 
 /**
  * @author Spencer Gibb
+ * @author Wonchul Heo
  */
 public class InstanceRegistry extends PeerAwareInstanceRegistryImpl implements ApplicationContextAware {
 
@@ -78,52 +79,65 @@ public class InstanceRegistry extends PeerAwareInstanceRegistryImpl implements A
 
 	@Override
 	public void register(InstanceInfo info, int leaseDuration, boolean isReplication) {
-		handleRegistration(info, leaseDuration, isReplication);
 		super.register(info, leaseDuration, isReplication);
+		handleRegistration(info, leaseDuration, isReplication);
 	}
 
 	@Override
 	public void register(final InstanceInfo info, final boolean isReplication) {
-		handleRegistration(info, resolveInstanceLeaseDuration(info), isReplication);
 		super.register(info, isReplication);
+		handleRegistration(info, resolveInstanceLeaseDuration(info), isReplication);
 	}
 
 	@Override
 	public boolean cancel(String appName, String serverId, boolean isReplication) {
-		handleCancelation(appName, serverId, isReplication);
-		return super.cancel(appName, serverId, isReplication);
+		final boolean cancelled = super.cancel(appName, serverId, isReplication);
+		if (cancelled) {
+			handleCancelation(appName, serverId, isReplication);
+		}
+		return cancelled;
 	}
 
 	@Override
 	public boolean renew(final String appName, final String serverId, boolean isReplication) {
-		log("renew " + appName + " serverId " + serverId + ", isReplication {}" + isReplication);
-		Application application = getApplication(appName);
-		if (application != null) {
-			InstanceInfo instanceInfo = application.getByInstanceId(serverId);
-			if (instanceInfo != null) {
-				publishEvent(new EurekaInstanceRenewedEvent(this, appName, serverId, instanceInfo, isReplication));
-			}
+		final boolean renewed = super.renew(appName, serverId, isReplication);
+		if (renewed) {
+			handleRenewal(appName, serverId, isReplication);
 		}
-		return super.renew(appName, serverId, isReplication);
+		return renewed;
 	}
 
 	@Override
 	protected boolean internalCancel(String appName, String id, boolean isReplication) {
-		handleCancelation(appName, id, isReplication);
-		return super.internalCancel(appName, id, isReplication);
+		final boolean cancelled = super.internalCancel(appName, id, isReplication);
+		if (cancelled) {
+			handleCancelation(appName, id, isReplication);
+		}
+		return cancelled;
 	}
 
 	private void handleCancelation(String appName, String id, boolean isReplication) {
-		log("cancel " + appName + ", serverId " + id + ", isReplication " + isReplication);
+		log("cancelled " + appName + ", serverId " + id + ", isReplication " + isReplication);
 		publishEvent(new EurekaInstanceCanceledEvent(this, appName, id, isReplication));
 	}
 
 	private void handleRegistration(InstanceInfo info, int leaseDuration, boolean isReplication) {
-		log("register " + info.getAppName() + ", vip " + info.getVIPAddress() + ", leaseDuration " + leaseDuration
+		log("registered " + info.getAppName() + ", vip " + info.getVIPAddress() + ", leaseDuration " + leaseDuration
 				+ ", isReplication " + isReplication);
 		publishEvent(new EurekaInstanceRegisteredEvent(this, info, leaseDuration, isReplication));
 	}
 
+	private void handleRenewal(final String appName, final String serverId, boolean isReplication) {
+		log("renewed " + appName + ", serverId " + serverId + ", isReplication " + isReplication);
+		final Application application = getApplication(appName);
+		if (application != null) {
+			final InstanceInfo instanceInfo = application.getByInstanceId(serverId);
+			if (instanceInfo != null) {
+				publishEvent(new EurekaInstanceRenewedEvent(this, appName, serverId, instanceInfo, isReplication));
+			}
+		}
+	}
+
 	private void log(String message) {
 		if (log.isDebugEnabled()) {
 			log.debug(message);

spring-cloud-netflix-eureka-server/src/main/java/org/springframework/cloud/netflix/eureka/server/event/EurekaInstanceCanceledEvent.java

@@ -84,9 +84,16 @@ public class EurekaInstanceCanceledEvent extends ApplicationEvent {
 
 	@Override
 	public String toString() {
-		return new StringBuilder("EurekaInstanceCanceledEvent{").append("appName='").append(appName).append("', ")
-				.append("serverId='").append(serverId).append("', ").append("replication=").append(replication)
-				.append("}").toString();
+		return new StringBuilder("EurekaInstanceCanceledEvent{").append("appName='")
+			.append(appName)
+			.append("', ")
+			.append("serverId='")
+			.append(serverId)
+			.append("', ")
+			.append("replication=")
+			.append(replication)
+			.append("}")
+			.toString();
 	}
 
 }

spring-cloud-netflix-eureka-server/src/main/java/org/springframework/cloud/netflix/eureka/server/event/EurekaInstanceRegisteredEvent.java

@@ -87,9 +87,16 @@ public class EurekaInstanceRegisteredEvent extends ApplicationEvent {
 
 	@Override
 	public String toString() {
-		return new StringBuilder("EurekaInstanceRegisteredEvent{").append("instanceInfo=").append(instanceInfo)
-				.append(", ").append("leaseDuration=").append(leaseDuration).append(", ").append("replication=")
-				.append(replication).append("}").toString();
+		return new StringBuilder("EurekaInstanceRegisteredEvent{").append("instanceInfo=")
+			.append(instanceInfo)
+			.append(", ")
+			.append("leaseDuration=")
+			.append(leaseDuration)
+			.append(", ")
+			.append("replication=")
+			.append(replication)
+			.append("}")
+			.toString();
 	}
 
 }

spring-cloud-netflix-eureka-server/src/main/java/org/springframework/cloud/netflix/eureka/server/event/EurekaInstanceRenewedEvent.java

@@ -98,9 +98,19 @@ public class EurekaInstanceRenewedEvent extends ApplicationEvent {
 
 	@Override
 	public String toString() {
-		return new StringBuilder("EurekaInstanceRenewedEvent{").append("appName='").append(appName).append("', ")
-				.append("serverId='").append(serverId).append("', ").append("instanceInfo=").append(instanceInfo)
-				.append(", ").append("replication=").append(replication).append("}").toString();
+		return new StringBuilder("EurekaInstanceRenewedEvent{").append("appName='")
+			.append(appName)
+			.append("', ")
+			.append("serverId='")
+			.append(serverId)
+			.append("', ")
+			.append("instanceInfo=")
+			.append(instanceInfo)
+			.append(", ")
+			.append("replication=")
+			.append(replication)
+			.append("}")
+			.toString();
 	}
 
 }

spring-cloud-netflix-eureka-server/src/main/java/org/springframework/cloud/netflix/eureka/server/metrics/DefaultEurekaInstanceTagsProvider.java

@@ -0,0 +1,37 @@
+/*
+ * Copyright 2013-2024 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.cloud.netflix.eureka.server.metrics;
+
+import com.netflix.appinfo.InstanceInfo;
+import io.micrometer.core.instrument.Tag;
+import io.micrometer.core.instrument.Tags;
+
+/**
+ * Default implementation for {@link EurekaInstanceTagsProvider}.
+ *
+ * @author Wonchul Heo
+ * @since 4.1.2
+ */
+class DefaultEurekaInstanceTagsProvider implements EurekaInstanceTagsProvider {
+
+	@Override
+	public Tags eurekaInstanceTags(InstanceInfo instanceInfo) {
+		return Tags.of(Tag.of("application", instanceInfo.getAppName()),
+				Tag.of("status", instanceInfo.getStatus().name()));
+	}
+
+}

spring-cloud-netflix-eureka-server/src/main/java/org/springframework/cloud/netflix/eureka/server/metrics/EurekaInstanceMetricsAutoConfiguration.java

@@ -0,0 +1,66 @@
+/*
+ * Copyright 2013-2025 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.cloud.netflix.eureka.server.metrics;
+
+import com.netflix.eureka.registry.PeerAwareInstanceRegistry;
+import io.micrometer.core.instrument.MeterRegistry;
+
+import org.springframework.beans.factory.annotation.Qualifier;
+import org.springframework.boot.actuate.autoconfigure.metrics.CompositeMeterRegistryAutoConfiguration;
+import org.springframework.boot.actuate.autoconfigure.metrics.MetricsAutoConfiguration;
+import org.springframework.boot.autoconfigure.AutoConfiguration;
+import org.springframework.boot.autoconfigure.condition.ConditionalOnBean;
+import org.springframework.boot.autoconfigure.condition.ConditionalOnClass;
+import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean;
+import org.springframework.boot.autoconfigure.condition.ConditionalOnProperty;
+import org.springframework.boot.autoconfigure.task.TaskExecutionAutoConfiguration;
+import org.springframework.cloud.netflix.eureka.server.EurekaServerAutoConfiguration;
+import org.springframework.context.annotation.Bean;
+import org.springframework.core.task.TaskExecutor;
+import org.springframework.scheduling.concurrent.ThreadPoolTaskExecutor;
+
+import static org.springframework.boot.autoconfigure.task.TaskExecutionAutoConfiguration.APPLICATION_TASK_EXECUTOR_BEAN_NAME;
+
+/**
+ * Auto-configuration for Eureka Instance metrics.
+ *
+ * @author Wonchul Heo
+ * @author Olga Maciaszek-Sharma
+ * @since 4.1.2
+ */
+@ConditionalOnClass({ MeterRegistry.class, ThreadPoolTaskExecutor.class })
+@ConditionalOnBean(MeterRegistry.class)
+@AutoConfiguration(after = { MetricsAutoConfiguration.class, CompositeMeterRegistryAutoConfiguration.class,
+		EurekaServerAutoConfiguration.class, TaskExecutionAutoConfiguration.class })
+@ConditionalOnProperty(name = "eureka.server.metrics.enabled", havingValue = "true")
+class EurekaInstanceMetricsAutoConfiguration {
+
+	@ConditionalOnMissingBean
+	@Bean
+	public EurekaInstanceTagsProvider eurekaInstanceTagProvider() {
+		return new DefaultEurekaInstanceTagsProvider();
+	}
+
+	@ConditionalOnMissingBean
+	@Bean
+	public EurekaInstanceMonitor eurekaInstanceMeterBinder(MeterRegistry meterRegistry,
+			PeerAwareInstanceRegistry instanceRegistry, EurekaInstanceTagsProvider tagProvider,
+			@Qualifier(APPLICATION_TASK_EXECUTOR_BEAN_NAME) TaskExecutor executor) {
+		return new EurekaInstanceMonitor(meterRegistry, instanceRegistry, tagProvider, executor);
+	}
+
+}

spring-cloud-netflix-eureka-server/src/main/java/org/springframework/cloud/netflix/eureka/server/metrics/EurekaInstanceMonitor.java

@@ -0,0 +1,95 @@
+/*
+ * Copyright 2013-2024 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.cloud.netflix.eureka.server.metrics;
+
+import java.util.Map;
+import java.util.Objects;
+import java.util.concurrent.Executor;
+import java.util.stream.Collectors;
+
+import com.netflix.eureka.registry.PeerAwareInstanceRegistry;
+import io.micrometer.core.instrument.MeterRegistry;
+import io.micrometer.core.instrument.MultiGauge;
+import io.micrometer.core.instrument.Tags;
+
+import org.springframework.cloud.netflix.eureka.server.event.EurekaInstanceCanceledEvent;
+import org.springframework.cloud.netflix.eureka.server.event.EurekaInstanceRegisteredEvent;
+import org.springframework.cloud.netflix.eureka.server.event.EurekaInstanceRenewedEvent;
+import org.springframework.context.ApplicationEvent;
+import org.springframework.context.event.SmartApplicationListener;
+
+/**
+ * {@link SmartApplicationListener} for collecting event metrics from
+ * {@link PeerAwareInstanceRegistry}.
+ *
+ * @author Wonchul Heo
+ * @author Olga Maciaszek-Sharma
+ * @since 4.1.2
+ */
+public class EurekaInstanceMonitor implements SmartApplicationListener {
+
+	private final MultiGauge eurekaInstances;
+
+	private final PeerAwareInstanceRegistry instanceRegistry;
+
+	private final EurekaInstanceTagsProvider tagProvider;
+
+	private final Executor executor;
+
+	EurekaInstanceMonitor(MeterRegistry meterRegistry, PeerAwareInstanceRegistry instanceRegistry,
+			EurekaInstanceTagsProvider tagProvider, Executor executor) {
+		Objects.requireNonNull(meterRegistry);
+		this.instanceRegistry = Objects.requireNonNull(instanceRegistry);
+		this.tagProvider = Objects.requireNonNull(tagProvider);
+		this.eurekaInstances = MultiGauge.builder("eureka.server.instances")
+			.description("Number of application instances registered with the Eureka server.")
+			.register(meterRegistry);
+		this.executor = executor;
+	}
+
+	@Override
+	public boolean supportsEventType(Class<? extends ApplicationEvent> eventType) {
+		// If events that change state are added, an event class must be added.
+		return EurekaInstanceCanceledEvent.class.isAssignableFrom(eventType)
+				|| EurekaInstanceRegisteredEvent.class.isAssignableFrom(eventType)
+				|| EurekaInstanceRenewedEvent.class.isAssignableFrom(eventType);
+	}
+
+	@Override
+	public void onApplicationEvent(ApplicationEvent event) {
+		executor.execute(() -> {
+			Map<Tags, Long> aggregatedCounts = collectAggregatedCounts();
+			registerMetrics(aggregatedCounts);
+		});
+	}
+
+	private Map<Tags, Long> collectAggregatedCounts() {
+		return instanceRegistry.getApplications()
+			.getRegisteredApplications()
+			.stream()
+			.flatMap(application -> application.getInstances().stream())
+			.collect(Collectors.groupingBy(tagProvider::eurekaInstanceTags, Collectors.counting()));
+	}
+
+	private void registerMetrics(Map<Tags, Long> aggregatedCounts) {
+		eurekaInstances.register(aggregatedCounts.entrySet()
+			.stream()
+			.map(entry -> MultiGauge.Row.of(entry.getKey(), entry.getValue()))
+			.collect(Collectors.toList()), true);
+	}
+
+}

spring-cloud-netflix-eureka-server/src/main/java/org/springframework/cloud/netflix/eureka/server/metrics/EurekaInstanceTagsProvider.java

@@ -0,0 +1,32 @@
+/*
+ * Copyright 2013-2024 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.cloud.netflix.eureka.server.metrics;
+
+import com.netflix.appinfo.InstanceInfo;
+import io.micrometer.core.instrument.Tags;
+
+/**
+ * Provides {@link Tags} for Eureka instance metrics.
+ *
+ * @author Wonchul Heo
+ * @since 4.1.2
+ */
+public interface EurekaInstanceTagsProvider {
+
+	Tags eurekaInstanceTags(InstanceInfo instanceInfo);
+
+}

spring-cloud-netflix-eureka-server/src/main/resources/META-INF/additional-spring-configuration-metadata.json

@@ -0,0 +1,10 @@
+{
+  "properties": [
+    {
+      "name": "eureka.server.metrics.enabled",
+      "type": "java.lang.Boolean",
+      "defaultValue": "false",
+      "description": "Indicates whether the metrics should be enabled for eureka instances."
+    }
+  ]
+}

spring-cloud-netflix-eureka-server/src/main/resources/META-INF/spring/org.springframework.boot.autoconfigure.AutoConfiguration.imports

@@ -1 +1,3 @@
-org.springframework.cloud.netflix.eureka.server.EurekaServerAutoConfiguration
+org.springframework.cloud.netflix.eureka.server.EurekaServerAutoConfiguration
+org.springframework.cloud.netflix.eureka.server.EurekaServerJerseyClientAutoConfiguration
+org.springframework.cloud.netflix.eureka.server.metrics.EurekaInstanceMetricsAutoConfiguration