Collection injection may refer back to factory methods on same bean again

Issue: SPR-14996

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

@@ -20,6 +20,7 @@ import java.lang.annotation.ElementType;
 import java.lang.annotation.Retention;
 import java.lang.annotation.RetentionPolicy;
 import java.lang.annotation.Target;
+import java.util.List;
 import javax.annotation.PostConstruct;
 
 import org.junit.Before;
@@ -615,6 +616,15 @@ public class ConfigurationClassPostProcessorTests {
 		assertSame(ctx.getBean(BarImpl.class), ctx.getBean(FooImpl.class).bar);
 	}
 
+	@Test
+	public void testCollectionInjectionFromSameConfigurationClass() {
+		ApplicationContext ctx = new AnnotationConfigApplicationContext(CollectionInjectionConfiguration.class);
+		CollectionInjectionConfiguration bean = ctx.getBean(CollectionInjectionConfiguration.class);
+		assertNotNull(bean.testBeans);
+		assertEquals(1, bean.testBeans.size());
+		assertSame(ctx.getBean(TestBean.class), bean.testBeans.get(0));
+	}
+
 
 	// -------------------------------------------------------------------------
 
@@ -1253,4 +1263,16 @@ public class ConfigurationClassPostProcessorTests {
 		}
 	}
 
+	@Configuration
+	static class CollectionInjectionConfiguration {
+
+		@Autowired(required = false)
+		public List<TestBean> testBeans;
+
+		@Bean
+		public TestBean thing() {
+			return new TestBean();
+		}
+	}
+
 }