Merge pull request #46164 from nosan

* pr/46164:
  Exclude NettyAutoConfiguration from global lazy init

Closes gh-46164

spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/netty/NettyAutoConfiguration.java

@@ -19,10 +19,12 @@ package org.springframework.boot.autoconfigure.netty;
 import io.netty.util.NettyRuntime;
 import io.netty.util.ResourceLeakDetector;
 
+import org.springframework.boot.LazyInitializationExcludeFilter;
 import org.springframework.boot.autoconfigure.AutoConfiguration;
 import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnClass;
 import org.springframework.boot.context.properties.EnableConfigurationProperties;
+import org.springframework.context.annotation.Bean;
 
 /**
  * {@link EnableAutoConfiguration Auto-configuration} for Netty.
@@ -42,4 +44,9 @@ public class NettyAutoConfiguration {
 		}
 	}
 
+	@Bean
+	static LazyInitializationExcludeFilter nettyAutoConfigurationLazyInitializationExcludeFilter() {
+		return LazyInitializationExcludeFilter.forBeanTypes(NettyAutoConfiguration.class);
+	}
+
 }

spring-boot-project/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/netty/NettyAutoConfigurationTests.java

@@ -17,8 +17,10 @@
 package org.springframework.boot.autoconfigure.netty;
 
 import io.netty.util.ResourceLeakDetector;
+import org.junit.jupiter.api.AfterEach;
 import org.junit.jupiter.api.Test;
 
+import org.springframework.boot.LazyInitializationBeanFactoryPostProcessor;
 import org.springframework.boot.autoconfigure.AutoConfigurations;
 import org.springframework.boot.test.context.runner.ApplicationContextRunner;
 
@@ -34,13 +36,26 @@ class NettyAutoConfigurationTests {
 	private final ApplicationContextRunner contextRunner = new ApplicationContextRunner()
 		.withConfiguration(AutoConfigurations.of(NettyAutoConfiguration.class));
 
+	@AfterEach
+	void resetResourceLeakDetector() {
+		ResourceLeakDetector.setLevel(ResourceLeakDetector.Level.DISABLED);
+	}
+
 	@Test
 	void leakDetectionShouldBeConfigured() {
-		this.contextRunner.withPropertyValues("spring.netty.leak-detection=paranoid").run((context) -> {
-			assertThat(ResourceLeakDetector.getLevel()).isEqualTo(ResourceLeakDetector.Level.PARANOID);
-			// reset configuration for the following tests.
-			ResourceLeakDetector.setLevel(ResourceLeakDetector.Level.DISABLED);
-		});
+		this.contextRunner.withPropertyValues("spring.netty.leak-detection=paranoid")
+			.run((context) -> assertThat(ResourceLeakDetector.getLevel())
+				.isEqualTo(ResourceLeakDetector.Level.PARANOID));
+	}
+
+	@Test
+	void leakDetectionShouldBeConfiguredWhenLazyInitializationIsEnabled() {
+		this.contextRunner
+			.withInitializer(
+					(context) -> context.addBeanFactoryPostProcessor(new LazyInitializationBeanFactoryPostProcessor()))
+			.withPropertyValues("spring.netty.leak-detection=advanced")
+			.run((context) -> assertThat(ResourceLeakDetector.getLevel())
+				.isEqualTo(ResourceLeakDetector.Level.ADVANCED));
 	}
 
 }