Obtain real Class object for Spring bean

Question

I am using Spring to inject beans. And I am using some annotations to annotate bean methods (Security, TransactionManagement, ExceptionHanling, Logging). The problem is:

I want to create JUnit test to check if I forgot annotate some methods. But Spring returns $ProxyXXX class without any annotations on methods..

Method[] methods = logic.getClass().getMethods();

  for (Method method : methods) {
     Annotation[] annotations = method.getAnnotations();   // empty array!

How can I get annotations for method or obtain a real class object?

P.S. Spring 2.5.6, JDKDynamicProxy (not CGLib)

Analogous question for Seam http://stackoverflow.com/questions/1979717/losing-class-custom-annotation-for-proxy-classes — Pavel Vyazankin, Feb 18 '10 at 15:00

score 32 · Accepted Answer · edited Jun 19 '19 at 22:25

32

Spring's interface-based proxies implement TargetClassAware.

edited Jun 19 '19 at 22:25

Manuel Jordan

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answered Feb 18 '10 at 14:42

axtavt

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Nice! Sorry for outdated comment, I used `AopUtils.getTargetClass(Object)` from "see also" section in the provided link. – iozee Sep 29 '16 at 09:45

score 24 · Answer 2 · edited Jun 19 '19 at 22:24

24

Or you can just call: AopUtils.getTargetClass(java.lang.Object) It is a static method call.

edited Jun 19 '19 at 22:24

Manuel Jordan

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answered Jul 23 '15 at 19:06

Korobko Alex

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Daff · Answer 3 · 2010-02-18T14:53:59.327

You can cast the proxied object to get the object and class it acts as a proxy for (see TargetSource):

Advised advised = (Advised) proxy;
Class<?> cls = advised.getTargetSource().getTargetClass();

Generally you should follow the Spring principles and keep obtaining the correct class as unobtrusive as possible. Meaning that as little classes as possible should depend on the Spring Framework APIs (maybe add a ClassLocator and a SpringProxyClassLocator implementation).

score 8 · Answer 4 · answered May 21 '21 at 23:50

8

AopUtils.getTargetClass only unwraps one level. Use AopProxyUtils.ultimateTargetClass(instance) instead.

(I'm aware this is an 11 years old question, but it's still coming up high in Google, so it benefits from a new answer)

answered May 21 '21 at 23:50

kaqqao

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Obtain real Class object for Spring bean

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