Polishing (aligned with 6.1.x)

Author: jhoeller

Diff for: spring-beans/src/main/java/org/springframework/beans/factory/support/AbstractAutowireCapableBeanFactory.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2023 the original author or authors.
+ * Copyright 2002-2024 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.
@@ -818,11 +818,11 @@ protected Class<?> getTypeForFactoryMethod(String beanName, RootBeanDefinition m
 	/**
 	 * This implementation attempts to query the FactoryBean's generic parameter metadata
 	 * if present to determine the object type. If not present, i.e. the FactoryBean is
-	 * declared as a raw type, checks the FactoryBean's {@code getObjectType} method
+	 * declared as a raw type, it checks the FactoryBean's {@code getObjectType} method
 	 * on a plain instance of the FactoryBean, without bean properties applied yet.
-	 * If this doesn't return a type yet, and {@code allowInit} is {@code true} a
-	 * full creation of the FactoryBean is used as fallback (through delegation to the
-	 * superclass's implementation).
+	 * If this doesn't return a type yet and {@code allowInit} is {@code true}, full
+	 * creation of the FactoryBean is attempted as fallback (through delegation to the
+	 * superclass implementation).
 	 * <p>The shortcut check for a FactoryBean is only applied in case of a singleton
 	 * FactoryBean. If the FactoryBean instance itself is not kept as singleton,
 	 * it will be fully created to check the type of its exposed object.

Diff for: spring-beans/src/main/java/org/springframework/beans/factory/support/AbstractBeanFactory.java

@@ -1649,7 +1649,7 @@ protected boolean isFactoryBean(String beanName, RootBeanDefinition mbd) {
 	 * already. The implementation is allowed to instantiate the target factory bean if
 	 * {@code allowInit} is {@code true} and the type cannot be determined another way;
 	 * otherwise it is restricted to introspecting signatures and related metadata.
-	 * <p>If no {@link FactoryBean#OBJECT_TYPE_ATTRIBUTE} if set on the bean definition
+	 * <p>If no {@link FactoryBean#OBJECT_TYPE_ATTRIBUTE} is set on the bean definition
 	 * and {@code allowInit} is {@code true}, the default implementation will create
 	 * the FactoryBean via {@code getBean} to call its {@code getObjectType} method.
 	 * Subclasses are encouraged to optimize this, typically by inspecting the generic

Diff for: spring-context/src/test/java/org/springframework/context/annotation/ConfigurationWithFactoryBeanBeanEarlyDeductionTests.java renamed to spring-context/src/test/java/org/springframework/context/annotation/ConfigurationWithFactoryBeanEarlyDeductionTests.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2019 the original author or authors.
+ * Copyright 2002-2024 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.
@@ -29,7 +29,9 @@
 import org.springframework.beans.factory.support.BeanDefinitionBuilder;
 import org.springframework.beans.factory.support.BeanDefinitionRegistry;
 import org.springframework.beans.factory.support.GenericBeanDefinition;
+import org.springframework.beans.factory.support.RootBeanDefinition;
 import org.springframework.context.support.GenericApplicationContext;
+import org.springframework.core.ResolvableType;
 import org.springframework.core.type.AnnotationMetadata;
 
 import static org.assertj.core.api.Assertions.assertThat;
@@ -39,51 +41,62 @@
  * {@link FactoryBean FactoryBeans} defined in the configuration.
  *
  * @author Phillip Webb
+ * @author Juergen Hoeller
  */
-public class ConfigurationWithFactoryBeanBeanEarlyDeductionTests {
+class ConfigurationWithFactoryBeanEarlyDeductionTests {
 
 	@Test
-	public void preFreezeDirect() {
+	void preFreezeDirect() {
 		assertPreFreeze(DirectConfiguration.class);
 	}
 
 	@Test
-	public void postFreezeDirect() {
+	void postFreezeDirect() {
 		assertPostFreeze(DirectConfiguration.class);
 	}
 
 	@Test
-	public void preFreezeGenericMethod() {
+	void preFreezeGenericMethod() {
 		assertPreFreeze(GenericMethodConfiguration.class);
 	}
 
 	@Test
-	public void postFreezeGenericMethod() {
+	void postFreezeGenericMethod() {
 		assertPostFreeze(GenericMethodConfiguration.class);
 	}
 
 	@Test
-	public void preFreezeGenericClass() {
+	void preFreezeGenericClass() {
 		assertPreFreeze(GenericClassConfiguration.class);
 	}
 
 	@Test
-	public void postFreezeGenericClass() {
+	void postFreezeGenericClass() {
 		assertPostFreeze(GenericClassConfiguration.class);
 	}
 
 	@Test
-	public void preFreezeAttribute() {
+	void preFreezeAttribute() {
 		assertPreFreeze(AttributeClassConfiguration.class);
 	}
 
 	@Test
-	public void postFreezeAttribute() {
+	void postFreezeAttribute() {
 		assertPostFreeze(AttributeClassConfiguration.class);
 	}
 
 	@Test
-	public void preFreezeUnresolvedGenericFactoryBean() {
+	void preFreezeTargetType() {
+		assertPreFreeze(TargetTypeConfiguration.class);
+	}
+
+	@Test
+	void postFreezeTargetType() {
+		assertPostFreeze(TargetTypeConfiguration.class);
+	}
+
+	@Test
+	void preFreezeUnresolvedGenericFactoryBean() {
 		// Covers the case where a @Configuration is picked up via component scanning
 		// and its bean definition only has a String bean class. In such cases
 		// beanDefinition.hasBeanClass() returns false so we need to actually
@@ -105,14 +118,13 @@ public void preFreezeUnresolvedGenericFactoryBean() {
 		}
 	}
 
+
 	private void assertPostFreeze(Class<?> configurationClass) {
-		AnnotationConfigApplicationContext context = new AnnotationConfigApplicationContext(
-				configurationClass);
+		AnnotationConfigApplicationContext context = new AnnotationConfigApplicationContext(configurationClass);
 		assertContainsMyBeanName(context);
 	}
 
-	private void assertPreFreeze(Class<?> configurationClass,
-			BeanFactoryPostProcessor... postProcessors) {
+	private void assertPreFreeze(Class<?> configurationClass, BeanFactoryPostProcessor... postProcessors) {
 		NameCollectingBeanFactoryPostProcessor postProcessor = new NameCollectingBeanFactoryPostProcessor();
 		AnnotationConfigApplicationContext context = new AnnotationConfigApplicationContext();
 		try (context) {
@@ -132,41 +144,38 @@ private void assertContainsMyBeanName(String[] names) {
 		assertThat(names).containsExactly("myBean");
 	}
 
-	private static class NameCollectingBeanFactoryPostProcessor
-			implements BeanFactoryPostProcessor {
+
+	private static class NameCollectingBeanFactoryPostProcessor implements BeanFactoryPostProcessor {
 
 		private String[] names;
 
 		@Override
-		public void postProcessBeanFactory(ConfigurableListableBeanFactory beanFactory)
-				throws BeansException {
-			this.names = beanFactory.getBeanNamesForType(MyBean.class, true, false);
+		public void postProcessBeanFactory(ConfigurableListableBeanFactory beanFactory) throws BeansException {
+			ResolvableType typeToMatch = ResolvableType.forClassWithGenerics(MyBean.class, String.class);
+			this.names = beanFactory.getBeanNamesForType(typeToMatch, true, false);
 		}
 
 		public String[] getNames() {
 			return this.names;
 		}
-
 	}
 
 	@Configuration
 	static class DirectConfiguration {
 
 		@Bean
-		MyBean myBean() {
-			return new MyBean();
+		MyBean<String> myBean() {
+			return new MyBean<>();
 		}
-
 	}
 
 	@Configuration
 	static class GenericMethodConfiguration {
 
 		@Bean
-		FactoryBean<MyBean> myBean() {
-			return new TestFactoryBean<>(new MyBean());
+		FactoryBean<MyBean<String>> myBean() {
+			return new TestFactoryBean<>(new MyBean<>());
 		}
-
 	}
 
 	@Configuration
@@ -176,13 +185,11 @@ static class GenericClassConfiguration {
 		MyFactoryBean myBean() {
 			return new MyFactoryBean();
 		}
-
 	}
 
 	@Configuration
 	@Import(AttributeClassRegistrar.class)
 	static class AttributeClassConfiguration {
-
 	}
 
 	static class AttributeClassRegistrar implements ImportBeanDefinitionRegistrar {
@@ -191,16 +198,32 @@ static class AttributeClassRegistrar implements ImportBeanDefinitionRegistrar {
 		public void registerBeanDefinitions(AnnotationMetadata importingClassMetadata, BeanDefinitionRegistry registry) {
 			BeanDefinition definition = BeanDefinitionBuilder.genericBeanDefinition(
 					RawWithAbstractObjectTypeFactoryBean.class).getBeanDefinition();
-			definition.setAttribute(FactoryBean.OBJECT_TYPE_ATTRIBUTE, MyBean.class);
+			definition.setAttribute(FactoryBean.OBJECT_TYPE_ATTRIBUTE,
+					ResolvableType.forClassWithGenerics(MyBean.class, String.class));
 			registry.registerBeanDefinition("myBean", definition);
 		}
+	}
 
+	@Configuration
+	@Import(TargetTypeRegistrar.class)
+	static class TargetTypeConfiguration {
+	}
+
+	static class TargetTypeRegistrar implements ImportBeanDefinitionRegistrar {
+
+		@Override
+		public void registerBeanDefinitions(AnnotationMetadata importingClassMetadata, BeanDefinitionRegistry registry) {
+			RootBeanDefinition definition = new RootBeanDefinition(RawWithAbstractObjectTypeFactoryBean.class);
+			definition.setTargetType(ResolvableType.forClassWithGenerics(FactoryBean.class,
+					ResolvableType.forClassWithGenerics(MyBean.class, String.class)));
+			registry.registerBeanDefinition("myBean", definition);
+		}
 	}
 
 	abstract static class AbstractMyBean {
 	}
 
-	static class MyBean extends AbstractMyBean {
+	static class MyBean<T> extends AbstractMyBean {
 	}
 
 	static class TestFactoryBean<T> implements FactoryBean<T> {
@@ -212,39 +235,34 @@ public TestFactoryBean(T instance) {
 		}
 
 		@Override
-		public T getObject() throws Exception {
+		public T getObject() {
 			return this.instance;
 		}
 
 		@Override
 		public Class<?> getObjectType() {
 			return this.instance.getClass();
 		}
-
 	}
 
-	static class MyFactoryBean extends TestFactoryBean<MyBean> {
+	static class MyFactoryBean extends TestFactoryBean<MyBean<String>> {
 
 		public MyFactoryBean() {
-			super(new MyBean());
+			super(new MyBean<>());
 		}
-
 	}
 
 	static class RawWithAbstractObjectTypeFactoryBean implements FactoryBean<Object> {
 
-		private final Object object = new MyBean();
-
 		@Override
 		public Object getObject() throws Exception {
-			return object;
+			throw new IllegalStateException();
 		}
 
 		@Override
 		public Class<?> getObjectType() {
 			return MyBean.class;
 		}
-
 	}
 
 }