Allow modules to contribute to Devtools' default properties

Closes gh-44792

module/spring-boot-devtools/src/main/java/org/springframework/boot/devtools/env/DevToolsPropertyDefaultsPostProcessor.java

@@ -16,12 +16,8 @@
 
 package org.springframework.boot.devtools.env;
 
-import java.io.IOException;
-import java.io.InputStream;
 import java.util.Collections;
-import java.util.HashMap;
 import java.util.Map;
-import java.util.Properties;
 
 import org.apache.commons.logging.Log;
 import org.jspecify.annotations.Nullable;
@@ -30,6 +26,7 @@ import org.springframework.boot.EnvironmentPostProcessor;
 import org.springframework.boot.SpringApplication;
 import org.springframework.boot.devtools.logger.DevToolsLogFactory;
 import org.springframework.boot.devtools.restart.Restarter;
+import org.springframework.boot.devtools.settings.DevToolsSettings;
 import org.springframework.boot.devtools.system.DevToolsEnablementDeducer;
 import org.springframework.core.NativeDetector;
 import org.springframework.core.Ordered;
@@ -69,7 +66,7 @@ public class DevToolsPropertyDefaultsPostProcessor implements EnvironmentPostPro
 			PROPERTIES = Collections.emptyMap();
 		}
 		else {
-			PROPERTIES = loadDefaultProperties();
+			PROPERTIES = DevToolsSettings.get().getPropertyDefaults();
 		}
 	}
 
@@ -133,24 +130,4 @@ public class DevToolsPropertyDefaultsPostProcessor implements EnvironmentPostPro
 		}
 	}
 
-	private static Map<String, Object> loadDefaultProperties() {
-		Properties properties = new Properties();
-		try (InputStream stream = DevToolsPropertyDefaultsPostProcessor.class
-			.getResourceAsStream("devtools-property-defaults.properties")) {
-			if (stream == null) {
-				throw new RuntimeException(
-						"Failed to load devtools-property-defaults.properties because it doesn't exist");
-			}
-			properties.load(stream);
-		}
-		catch (IOException ex) {
-			throw new RuntimeException("Failed to load devtools-property-defaults.properties", ex);
-		}
-		Map<String, Object> map = new HashMap<>();
-		for (String name : properties.stringPropertyNames()) {
-			map.put(name, properties.getProperty(name));
-		}
-		return Collections.unmodifiableMap(map);
-	}
-
 }

module/spring-boot-devtools/src/main/java/org/springframework/boot/devtools/settings/DevToolsSettings.java

@@ -18,7 +18,9 @@ package org.springframework.boot.devtools.settings;
 
 import java.net.URL;
 import java.util.ArrayList;
+import java.util.Collections;
 import java.util.Enumeration;
+import java.util.HashMap;
 import java.util.LinkedHashMap;
 import java.util.List;
 import java.util.Map;
@@ -52,14 +54,23 @@ public class DevToolsSettings {
 
 	private final List<Pattern> restartExcludePatterns = new ArrayList<>();
 
+	private final Map<String, Object> propertyDefaults = new HashMap<>();
+
 	DevToolsSettings() {
 	}
 
-	void add(Map<?, ?> properties) {
+	private void add(Map<?, ?> properties) {
 		Map<String, Pattern> includes = getPatterns(properties, "restart.include.");
 		this.restartIncludePatterns.addAll(includes.values());
 		Map<String, Pattern> excludes = getPatterns(properties, "restart.exclude.");
 		this.restartExcludePatterns.addAll(excludes.values());
+		properties.forEach((key, value) -> {
+			String name = String.valueOf(key);
+			if (name.startsWith("defaults.")) {
+				name = name.substring("defaults.".length());
+				this.propertyDefaults.put(name, value);
+			}
+		});
 	}
 
 	private Map<String, Pattern> getPatterns(Map<?, ?> properties, String prefix) {
@@ -82,6 +93,10 @@ public class DevToolsSettings {
 		return isMatch(url.toString(), this.restartExcludePatterns);
 	}
 
+	public Map<String, Object> getPropertyDefaults() {
+		return Collections.unmodifiableMap(this.propertyDefaults);
+	}
+
 	private boolean isMatch(String url, List<Pattern> patterns) {
 		for (Pattern pattern : patterns) {
 			if (pattern.matcher(url).find()) {

module/spring-boot-devtools/src/main/resources/org/springframework/boot/devtools/env/devtools-property-defaults.properties

@@ -1,17 +0,0 @@
-server.error.include-binding-errors=always
-server.error.include-message=always
-server.error.include-stacktrace=always
-server.servlet.jsp.init-parameters.development=true
-server.servlet.session.persistent=true
-spring.freemarker.cache=false
-spring.graphql.graphiql.enabled=true
-spring.groovy.template.cache=false
-spring.h2.console.enabled=true
-spring.mustache.servlet.cache=false
-spring.mvc.log-resolved-exception=true
-spring.reactor.netty.shutdown-quiet-period=0s
-spring.template.provider.cache=false
-spring.thymeleaf.cache=false
-spring.web.resources.cache.period=0
-spring.web.resources.chain.cache=false
-spring.docker.compose.readiness.wait=only-if-started