How to unwrap the original object from a dynamic proxy

Question

what's the best approach to unwrap a dynamic proxy to retrieve the original object beneath? The dynamic proxy has been created using java.lang.reflect.Proxy.newProxyInstance()

Thank you.

Answer 1

Each proxy has an InvocationHandler associated with it. Only the InvocationHandler knows which object (if any) underlies the proxy. If you control the creation of the proxy, then you can supply your own InvocationHandler that will have the extra functionality that you desire (i.e. will be able to disclose the underlying object.) If you don't, then I am afraid you're out of luck.

Answer 2

There's no good method: Proxy.getInvocationHandler(proxy) returns handler, but the problem is to extract the original object from the handler. If your handler is an anonymous class, the only way to extract original object is to use reflection and extract original from field named val$something - very ugly method. Better way is to create non-anonymous handler class with a getter, then you do:

((YourHandler)Proxy.getInvocationHandler(proxy)).getOriginalObject()

Answer 3

You can use the Proxy.getInvocationHandler(proxy) method to obtain the original InvocationHandler.