Using aspects to inject InvocationHandlers without Proxy class

Question

I want to create a class which proxies all calls to methods to its superclass with log information (i.e. before/after statements, for example).

However, the framework using this class will be loading it via the new (..) invocation, or else, via other reflection mechanisms, so I can't use the Proxy semantics to launch the class.

Is there a way to get the new and newInstance() operations to use a Proxy in all cases - or do we have to explictly create instances of a InvocationHandler class using the Proxy API?

Specifically: I'm debugging a distributed framework which already has its own way of creating class instances from XML files at runtime (hadoop - mapreduce).

Enno Shioji · Answer 1 · 2013-08-20T15:56:21.770

1

I don't think you can monkey patch in Java easily. I think you could try AOP, or hacking the class directly (as you'll have the source since it's hadoop). Otherwise I think reflection or byte code modification could be an option, but they are all going to be very nasty. Hacking the class directly and using a hacked jar sounds like the most straightforward way to me.

Btw Hi :)

edited Aug 20 '13 at 15:56

answered Aug 20 '13 at 15:48

Enno Shioji

26,542
13
70
109

agreed that Possibly adding in a hacked jar, which is gauranteed to have precedence in the ClassLoader, might be the right way to go. – jayunit100 Aug 26 '13 at 17:08
Hi enno ! Just now learning about BYTEMAN . Maybe it will help but not sure. – jayunit100 Sep 09 '13 at 15:25

Using aspects to inject InvocationHandlers without Proxy class

1 Answers1