Class Loading problem in Java Enterprise application

Question

I have Enterprise Application with EJB3 and JSF on Glassfish server. After running this application for more than 2 weeks I realized that I have problem with Class Loading. I don't think this is a problem with permgen. The classes loaded every time when I open a page but then they never erased from the memory. Here is the snapshot of or my server's memory:

Snapshot

So, i just need some pointers of how I can debug this problem.

Answer 1

There's a nice explanation of why this sort of things happen, and a more recent account of similar problem here.

Using jhat might help to find out what classes are occupying the memory, and then look for a static reference that may hold them/or the classloader, preventing proper unloading.