Lookup methods work on configuration classes as well

Issue: SPR-15316
(cherry picked from commit fc2e635)

spring-context/src/main/java/org/springframework/context/annotation/ConfigurationClassEnhancer.java

@@ -270,13 +270,13 @@ class ConfigurationClassEnhancer {
 
 		@Override
 		public Object intercept(Object obj, Method method, Object[] args, MethodProxy proxy) throws Throwable {
-			Field field = obj.getClass().getDeclaredField(BEAN_FACTORY_FIELD);
+			Field field = ReflectionUtils.findField(obj.getClass(), BEAN_FACTORY_FIELD);
 			Assert.state(field != null, "Unable to find generated BeanFactory field");
 			field.set(obj, args[0]);
 
-			// Does the actual (non-CGLIB) superclass actually implement BeanFactoryAware?
+			// Does the actual (non-CGLIB) superclass implement BeanFactoryAware?
 			// If so, call its setBeanFactory() method. If not, just exit.
-			if (BeanFactoryAware.class.isAssignableFrom(obj.getClass().getSuperclass())) {
+			if (BeanFactoryAware.class.isAssignableFrom(ClassUtils.getUserClass(obj.getClass().getSuperclass()))) {
 				return proxy.invokeSuper(obj, args);
 			}
 			return null;

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

@@ -39,6 +39,7 @@ import org.springframework.beans.factory.FactoryBean;
 import org.springframework.beans.factory.NoSuchBeanDefinitionException;
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor;
+import org.springframework.beans.factory.annotation.Lookup;
 import org.springframework.beans.factory.annotation.Qualifier;
 import org.springframework.beans.factory.annotation.QualifierAnnotationAutowireCandidateResolver;
 import org.springframework.beans.factory.config.BeanDefinitionHolder;
@@ -779,6 +780,14 @@ public class ConfigurationClassPostProcessorTests {
 		assertSame(ctx.getBean(TestBean.class), bean.testBeans.get(0));
 	}
 
+	@Test
+	public void testBeanLookupFromSameConfigurationClass() {
+		ApplicationContext ctx = new AnnotationConfigApplicationContext(BeanLookupConfiguration.class);
+		BeanLookupConfiguration bean = ctx.getBean(BeanLookupConfiguration.class);
+		assertNotNull(bean.getTestBean());
+		assertSame(ctx.getBean(TestBean.class), bean.getTestBean());
+	}
+
 
 	// -------------------------------------------------------------------------
 
@@ -1448,4 +1457,16 @@ public class ConfigurationClassPostProcessorTests {
 		}
 	}
 
+	@Configuration
+	static abstract class BeanLookupConfiguration {
+
+		@Bean
+		public TestBean thing() {
+			return new TestBean();
+		}
+
+		@Lookup
+		public abstract TestBean getTestBean();
+	}
+
 }