@Bean processing explicitly ignores bridge methods (for method overrides with return type narrowing on JDK 8)

Issue: SPR-11718

spring-context/src/test/java/org/springframework/context/annotation/BeanMethodPolymorphismTests.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2013 the original author or authors.
+ * Copyright 2002-2014 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.
@@ -23,6 +23,7 @@ import org.junit.Test;
 import org.junit.rules.ExpectedException;
 
 import org.springframework.beans.factory.parsing.BeanDefinitionParsingException;
+import org.springframework.beans.factory.support.RootBeanDefinition;
 
 import static org.hamcrest.CoreMatchers.*;
 import static org.junit.Assert.*;
@@ -58,6 +59,39 @@ public class BeanMethodPolymorphismTests {
 		assertTrue(ctx.getDefaultListableBeanFactory().containsSingleton("testBean"));
 	}
 
+	@Test
+	public void beanMethodOverridingOnASM() {
+		AnnotationConfigApplicationContext ctx = new AnnotationConfigApplicationContext();
+		ctx.registerBeanDefinition("config", new RootBeanDefinition(OverridingConfig.class.getName()));
+		ctx.setAllowBeanDefinitionOverriding(false);
+		ctx.refresh();
+		assertFalse(ctx.getDefaultListableBeanFactory().containsSingleton("testBean"));
+		assertEquals("overridden", ctx.getBean("testBean", TestBean.class).toString());
+		assertTrue(ctx.getDefaultListableBeanFactory().containsSingleton("testBean"));
+	}
+
+	@Test
+	public void beanMethodOverridingWithNarrowedReturnType() {
+		AnnotationConfigApplicationContext ctx = new AnnotationConfigApplicationContext();
+		ctx.register(NarrowedOverridingConfig.class);
+		ctx.setAllowBeanDefinitionOverriding(false);
+		ctx.refresh();
+		assertFalse(ctx.getDefaultListableBeanFactory().containsSingleton("testBean"));
+		assertEquals("overridden", ctx.getBean("testBean", TestBean.class).toString());
+		assertTrue(ctx.getDefaultListableBeanFactory().containsSingleton("testBean"));
+	}
+
+	@Test
+	public void beanMethodOverridingWithNarrowedReturnTypeOnASM() {
+		AnnotationConfigApplicationContext ctx = new AnnotationConfigApplicationContext();
+		ctx.registerBeanDefinition("config", new RootBeanDefinition(NarrowedOverridingConfig.class.getName()));
+		ctx.setAllowBeanDefinitionOverriding(false);
+		ctx.refresh();
+		assertFalse(ctx.getDefaultListableBeanFactory().containsSingleton("testBean"));
+		assertEquals("overridden", ctx.getBean("testBean", TestBean.class).toString());
+		assertTrue(ctx.getDefaultListableBeanFactory().containsSingleton("testBean"));
+	}
+
 	@Test
 	public void beanMethodOverloadingWithoutInheritance() {
 
@@ -138,6 +172,26 @@ public class BeanMethodPolymorphismTests {
 	}
 
 
+	static class ExtendedTestBean extends TestBean {
+	}
+
+
+	@Configuration
+	static class NarrowedOverridingConfig extends BaseConfig {
+
+		@Bean @Lazy
+		@Override
+		public ExtendedTestBean testBean() {
+			return new ExtendedTestBean() {
+				@Override
+				public String toString() {
+					return "overridden";
+				}
+			};
+		}
+	}
+
+
 	@Configuration
 	static class SuperConfig {
 

spring-core/src/main/java/org/springframework/core/type/StandardAnnotationMetadata.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2013 the original author or authors.
+ * Copyright 2002-2014 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.
@@ -160,6 +160,7 @@ public class StandardAnnotationMetadata extends StandardClassMetadata implements
 	public boolean hasAnnotatedMethods(String annotationType) {
 		Method[] methods = getIntrospectedClass().getDeclaredMethods();
 		for (Method method : methods) {
+			if (!method.isBridge()) {
 				for (Annotation ann : method.getAnnotations()) {
 					if (ann.annotationType().getName().equals(annotationType)) {
 						return true;
@@ -173,13 +174,15 @@ public class StandardAnnotationMetadata extends StandardClassMetadata implements
 					}
 				}
 			}
+		}
 		return false;
 	}
 
 	public Set<MethodMetadata> getAnnotatedMethods(String annotationType) {
-		Method[] methods = getIntrospectedClass().getDeclaredMethods();
 		Set<MethodMetadata> annotatedMethods = new LinkedHashSet<MethodMetadata>();
+		Method[] methods = getIntrospectedClass().getDeclaredMethods();
 		for (Method method : methods) {
+			if (!method.isBridge()) {
 				for (Annotation ann : method.getAnnotations()) {
 					if (ann.annotationType().getName().equals(annotationType)) {
 						annotatedMethods.add(new StandardMethodMetadata(method, this.nestedAnnotationsAsMap));
@@ -195,6 +198,7 @@ public class StandardAnnotationMetadata extends StandardClassMetadata implements
 					}
 				}
 			}
+		}
 		return annotatedMethods;
 	}
 

spring-core/src/main/java/org/springframework/core/type/classreading/AnnotationMetadataReadingVisitor.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2013 the original author or authors.
+ * Copyright 2002-2014 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.
@@ -19,12 +19,12 @@ package org.springframework.core.type.classreading;
 import java.util.Collection;
 import java.util.LinkedHashMap;
 import java.util.LinkedHashSet;
-import java.util.List;
 import java.util.Map;
 import java.util.Set;
 
 import org.springframework.asm.AnnotationVisitor;
 import org.springframework.asm.MethodVisitor;
+import org.springframework.asm.Opcodes;
 import org.springframework.asm.Type;
 import org.springframework.core.annotation.AnnotationAttributes;
 import org.springframework.core.type.AnnotationMetadata;
@@ -60,6 +60,11 @@ final class AnnotationMetadataReadingVisitor extends ClassMetadataReadingVisitor
 
 	@Override
 	public MethodVisitor visitMethod(int access, String name, String desc, String signature, String[] exceptions) {
+		// Skip bridge methods - we're only interested in original annotation-defining user methods.
+		// On JDK 8, we'd otherwise run into double detection of the same annotated method...
+		if ((access & Opcodes.ACC_BRIDGE) != 0) {
+			return super.visitMethod(access, name, desc, signature, exceptions);
+		}
 		return new MethodMetadataReadingVisitor(name, access, getClassName(), this.classLoader, this.methodMetadataSet);
 	}