Memory usage

[myself]

Hi,

I recently created a web application using Spring 3, Struts 2 and Hibernate 3. It all works fine together, but when developing the application (used Netbeans) when re-deploying the application i started running out of memory (permgen). I read up about it and read that there was a memory leak with hot deploys so just increased memory for tomcat and problem went away.
Now when i deployed the application on the live server i got hit by the permgen exception again. My application isnt that big so why am i running out of memory?
What is the average memory usage of a Spring, struts, hibernate application, its a small application, around 100 classes, basic website with databaseing.
Netbeans profiler tells me i have a heap size of 168Mb and running on average 99 threads, it also tells me "java.util.zip.zipfile" has a high "self time".
Could this be a setup problem, between spring, struts and hibernate. Or does any one have any ideas what could be causing such a simple application to use up all my memory.

Thanks
M

[myself]

After doing some more profiling, this time memory profiling i saw that most of my memory is being used up by chat[] and byte[]. Is there any way to find out what is using these array and how i can reduce or remove them. Just the chat[] and byte[] where using 32 and 22Mb respectively, so that is where most my memory is dissapearing to, any idea why?

Thanks
M