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Spring AOP and Java Refelction

Marutha kasirajan Ramanathan
Greenhorn

Joined: Jul 27, 2011
Posts: 2
Hi,



I have one method which is called using invoke() of the java.lang.reflect.Method class. How to intercept that method using Spring AOP ?

Thanks,
Kasi
Jayesh A Lalwani
Bartender

Joined: Jan 17, 2008
Posts: 2451
    
  28

If your annottated class is built to an interface, Spring AOP internally creates a Java proxy at runtime, and replaces the bean with the proxy bean

So, let's say you had a bean declared like this



this can be considered to be functionally equivalent to



If the bean is annottated with an aspect, you can consider that during initialization time, Spring creates this class



and the beans will be created like this



Please note the above code is for explanation only. Internally what happens is differrent.

So, here's the pitfall.. The proxy class implements only the methods in the interface. So, if you are using reflection on the proxy, you will not get all the methods. You will get only the interface methods. What you need to do is for the non interface methods, you need to get the underlying target object. I haven't done this myself before but I think this will work. You might have to try it. Every AOP proxy implements the org.springframework.aop.framework.Advised interface. This interface has a method to get the targetSource, and you can get the target object.

I think this will work. Maybe there is a better way of doing it.
 
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subject: Spring AOP and Java Refelction