Consistent getTypeForFactoryMethod result for parameterized method

Issue: SPR-16720

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

@@ -752,7 +752,8 @@ public abstract class AbstractAutowireCapableBeanFactory extends AbstractBeanFac
 						}
 						Class<?> returnType = AutowireUtils.resolveReturnTypeForFactoryMethod(
 								factoryMethod, args, getBeanClassLoader());
-						uniqueCandidate = (commonType == null ? factoryMethod : null);
+						uniqueCandidate = (commonType == null && returnType == factoryMethod.getReturnType() ?
+								factoryMethod : null);
 						commonType = ClassUtils.determineCommonAncestor(returnType, commonType);
 						if (commonType == null) {
 							// Ambiguous return types found: return null to indicate "not determinable".
@@ -776,12 +777,15 @@ public abstract class AbstractAutowireCapableBeanFactory extends AbstractBeanFac
 			}
 		}
 
-		if (commonType != null) {
+		if (commonType == null) {
-			// Clear return type found: all factory methods return same type.
+			return null;
-			mbd.factoryMethodReturnType = (uniqueCandidate != null ?
-					ResolvableType.forMethodReturnType(uniqueCandidate) : ResolvableType.forClass(commonType));
 		}
-		return commonType;
+		// Common return type found: all factory methods return same type. For a non-parameterized
+		// unique candidate, cache the full type declaration context of the target factory method.
+		cachedReturnType = (uniqueCandidate != null ?
+				ResolvableType.forMethodReturnType(uniqueCandidate) : ResolvableType.forClass(commonType));
+		mbd.factoryMethodReturnType = cachedReturnType;
+		return cachedReturnType.resolve();
 	}
 
 	/**

spring-beans/src/test/java/org/springframework/beans/factory/support/BeanFactoryGenericsTests.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2016 the original author or authors.
+ * Copyright 2002-2018 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.
@@ -40,6 +40,7 @@ import org.springframework.beans.factory.BeanCreationException;
 import org.springframework.beans.factory.config.TypedStringValue;
 import org.springframework.beans.factory.xml.XmlBeanDefinitionReader;
 import org.springframework.beans.propertyeditors.CustomNumberEditor;
+import org.springframework.core.OverridingClassLoader;
 import org.springframework.core.ResolvableType;
 import org.springframework.core.io.ClassPathResource;
 import org.springframework.core.io.UrlResource;
@@ -672,6 +673,8 @@ public class BeanFactoryGenericsTests {
 		DefaultListableBeanFactory bf = new DefaultListableBeanFactory();
 		bf.registerBeanDefinition("mock", rbd);
 
+		assertEquals(Runnable.class, bf.getType("mock"));
+		assertEquals(Runnable.class, bf.getType("mock"));
 		Map<String, Runnable> beans = bf.getBeansOfType(Runnable.class);
 		assertEquals(1, beans.size());
 	}
@@ -700,6 +703,10 @@ public class BeanFactoryGenericsTests {
 		rbd.getConstructorArgumentValues().addGenericArgumentValue(Runnable.class);
 		bf.registerBeanDefinition("mock", rbd);
 
+		assertTrue(bf.isTypeMatch("mock", Runnable.class));
+		assertTrue(bf.isTypeMatch("mock", Runnable.class));
+		assertEquals(Runnable.class, bf.getType("mock"));
+		assertEquals(Runnable.class, bf.getType("mock"));
 		Map<String, Runnable> beans = bf.getBeansOfType(Runnable.class);
 		assertEquals(1, beans.size());
 	}
@@ -717,6 +724,10 @@ public class BeanFactoryGenericsTests {
 		rbd.getConstructorArgumentValues().addGenericArgumentValue(Runnable.class.getName());
 		bf.registerBeanDefinition("mock", rbd);
 
+		assertTrue(bf.isTypeMatch("mock", Runnable.class));
+		assertTrue(bf.isTypeMatch("mock", Runnable.class));
+		assertEquals(Runnable.class, bf.getType("mock"));
+		assertEquals(Runnable.class, bf.getType("mock"));
 		Map<String, Runnable> beans = bf.getBeansOfType(Runnable.class);
 		assertEquals(1, beans.size());
 	}
@@ -732,6 +743,10 @@ public class BeanFactoryGenericsTests {
 		rbd.getConstructorArgumentValues().addGenericArgumentValue(new TypedStringValue(Runnable.class.getName()));
 		bf.registerBeanDefinition("mock", rbd);
 
+		assertTrue(bf.isTypeMatch("mock", Runnable.class));
+		assertTrue(bf.isTypeMatch("mock", Runnable.class));
+		assertEquals(Runnable.class, bf.getType("mock"));
+		assertEquals(Runnable.class, bf.getType("mock"));
 		Map<String, Runnable> beans = bf.getBeansOfType(Runnable.class);
 		assertEquals(1, beans.size());
 	}
@@ -749,6 +764,10 @@ public class BeanFactoryGenericsTests {
 		rbd.getConstructorArgumentValues().addGenericArgumentValue("x");
 		bf.registerBeanDefinition("mock", rbd);
 
+		assertFalse(bf.isTypeMatch("mock", Runnable.class));
+		assertFalse(bf.isTypeMatch("mock", Runnable.class));
+		assertNull(bf.getType("mock"));
+		assertNull(bf.getType("mock"));
 		Map<String, Runnable> beans = bf.getBeansOfType(Runnable.class);
 		assertEquals(0, beans.size());
 	}
@@ -766,6 +785,32 @@ public class BeanFactoryGenericsTests {
 		rbd.getConstructorArgumentValues().addIndexedArgumentValue(0, Runnable.class);
 		bf.registerBeanDefinition("mock", rbd);
 
+		assertTrue(bf.isTypeMatch("mock", Runnable.class));
+		assertTrue(bf.isTypeMatch("mock", Runnable.class));
+		assertEquals(Runnable.class, bf.getType("mock"));
+		assertEquals(Runnable.class, bf.getType("mock"));
+		Map<String, Runnable> beans = bf.getBeansOfType(Runnable.class);
+		assertEquals(1, beans.size());
+	}
+
+	@Test  // SPR-16720
+	public void parameterizedInstanceFactoryMethodWithTempClassLoader() {
+		DefaultListableBeanFactory bf = new DefaultListableBeanFactory();
+		bf.setTempClassLoader(new OverridingClassLoader(getClass().getClassLoader()));
+
+		RootBeanDefinition rbd = new RootBeanDefinition(MocksControl.class);
+		bf.registerBeanDefinition("mocksControl", rbd);
+
+		rbd = new RootBeanDefinition();
+		rbd.setFactoryBeanName("mocksControl");
+		rbd.setFactoryMethodName("createMock");
+		rbd.getConstructorArgumentValues().addGenericArgumentValue(Runnable.class);
+		bf.registerBeanDefinition("mock", rbd);
+
+		assertTrue(bf.isTypeMatch("mock", Runnable.class));
+		assertTrue(bf.isTypeMatch("mock", Runnable.class));
+		assertEquals(Runnable.class, bf.getType("mock"));
+		assertEquals(Runnable.class, bf.getType("mock"));
 		Map<String, Runnable> beans = bf.getBeansOfType(Runnable.class);
 		assertEquals(1, beans.size());
 	}