Exclude NettyAutoConfiguration from global lazy init

This commits registers LazyInitializationExcludeFilter to exclude
NettyAutoConfiguration from global lazy init

Signed-off-by: Dmytro Nosan <[email protected]>

Author: nosan

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

@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-present the original author or authors.
+ * Copyright 2012-2025 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.
@@ -19,10 +19,12 @@
 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 NettyAutoConfiguration(NettyProperties properties) {
 		}
 	}
 
+	@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

@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-present the original author or authors.
+ * Copyright 2012-2025 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.
@@ -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 +36,27 @@ 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);
 		});
 	}
 
+	@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);
+			});
+	}
+
 }