Fixed resolveReturnTypeForFactoryMethod to unwrap TypedStringValue

XML-defined arguments values are initially turned into TypedStringValue wrappers. If we encounter an unresolved argument, we need to unwrap such a TypedStringValue and then try to treat its content as a class name.

Issue: SPR-11034

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

@@ -37,6 +37,7 @@ import org.mockito.Mockito;
 import org.springframework.beans.PropertyEditorRegistrar;
 import org.springframework.beans.PropertyEditorRegistry;
 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.io.ClassPathResource;
@@ -720,6 +721,21 @@ public class BeanFactoryGenericsTests {
 		assertEquals(1, beans.size());
 	}
 
+	@Test
+	public void parameterizedInstanceFactoryMethodWithWrappedClassName() {
+		DefaultListableBeanFactory bf = new DefaultListableBeanFactory();
+
+		RootBeanDefinition rbd = new RootBeanDefinition();
+		rbd.setBeanClassName(Mockito.class.getName());
+		rbd.setFactoryMethodName("mock");
+		// TypedStringValue used to be equivalent to an XML-defined argument String
+		rbd.getConstructorArgumentValues().addGenericArgumentValue(new TypedStringValue(Runnable.class.getName()));
+		bf.registerBeanDefinition("mock", rbd);
+
+		Map<String, Runnable> beans = bf.getBeansOfType(Runnable.class);
+		assertEquals(1, beans.size());
+	}
+
 	@Test
 	public void parameterizedInstanceFactoryMethodWithIndexedArgument() {
 		DefaultListableBeanFactory bf = new DefaultListableBeanFactory();