Problem relating memory leak and session close

[S Sharma]

Hello to all

I am using ofbiz for a very big application also using birt for the reporting tool.
Wheny many user  hit the application server go slow down.
and the buffer memory get filled of java (using 4 g.b space) i thing this probably due to the memory leak
also i am not able able to close the session which is start by the birt.

Please somebody tell me how to close the session of birt

also please tell me probable place of memory leak.

PLEASE HELP ME