Method completion

Hi
I'm trying to add some kind of method completion to the jconsole.
The basic idea was to use javap on the variable which then prints out the
filtered list matching the string between the . and the end of line. This
kind of works but now I realise it's rather annoying not to be able to chain
methods as in: inst.methodA().methodB(a,b).methodC().TAB

What is the best way to resolve what the type of parameters being passed to
methodB is - do I need to resort to using the java parser and if so, could
someone give me some pointers ?

I'll obviously send the patch back when its working properly.
Thanks
David