Lookup methods work on configuration classes as well

Issue: SPR-15316

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();
+	}
+
 }