cglib动态代理导致注解丢失问题及如何修改注解允许被继承

现象

　　SOAService这个bean先后经过两个BeanPostProcessor，会发现代理之后注解就丢失了。

开启了cglib代理

@SpringBootApplication
@EnableAspectJAutoProxy(proxyTargetClass = true)
public class Application {public static void main(String[] args) {SpringApplication app = new SpringApplication(Application.class);app.run(args);}
}

为什么开启这个代理模式呢

　　http://www.cnblogs.com/hujunzheng/p/8428422.html　

如何解决这个问题

　　在自定义注解上添加@Inherited。如果是第三方的注解，调整项目接口层或者拿到这个注解通过代码方式加上@Inherited注解, 或者如下图所示。

public Object postProcessBeforeInitialization(Object bean, String beanName) throws BeansException {Service anon = bean.getClass().getAnnotation(Service.class);if (anon != null) {try {InvocationHandler h = Proxy.getInvocationHandler(anon);//设置@Service注解支持继承，应对动态代理导致类上的@Service注解丢失Field typeField = h.getClass().getDeclaredField("type");typeField.setAccessible(true);Field annotationTypeField = Class.class.getDeclaredField("annotationType");annotationTypeField.setAccessible(true);AnnotationType annotationType = (AnnotationType) annotationTypeField.get(typeField.get(h));Field inheritedField = AnnotationType.class.getDeclaredField("inherited");this.updateFinalModifiers(inheritedField);inheritedField.set(annotationType, true);// 获取 AnnotationInvocationHandler 的 memberValues 字段Field memberValuesField = h.getClass().getDeclaredField("memberValues");// 因为这个字段事 private final 修饰，所以要打开权限memberValuesField.setAccessible(true);// 获取 memberValuesMap memberValues = (Map) memberValuesField.get(h);Service service = Stream.of(bean.getClass().getInterfaces()).filter(iface -> iface.getAnnotation(Service.class) != null).collect(Collectors.toList()).get(0).getAnnotation(Service.class);memberValues.put("version", service.version());memberValues.put("group", service.group());} catch (Exception e) {throw new BeanCreationException(String.format("%s %s %s %s %s", "修改", ClassUtils.getQualifiedName(bean.getClass()), "的注解", ClassUtils.getQualifiedName(Service.class), "的 group值和version值出错"), e);}}return bean;
}