Java heap not decreasing properly

We’re using Weblogic Server 8.1.3 in our applications and having a trouble.
Our server’s main specifications are :
IBM Server
Intel Xeon EM64T supported 3.2 Ghz CPU
5 GB physical RAM
Fedora Linux Core 3
70 GB hard disk
We set 2 GB Ram as max java heap.We almost made all the tuning in jrockit, jdbc,Linux parameters etc as you mentioned in performance tuning guide from your site.
The heap goes well during the all week with well garbage connected , but after 8-9 days, the heap does not decrease to its main level after gc (for example 400mb.) even the app. is not used as the graph shown.We’re using jt400 as jdbc driver connecting to As/400. If we restart the server, the problem is solved.But as you desire, restarting server every week is not a healthy solution for us.
What can be done for this problem?!!
Thans for your great support.

You have a memory leak. I suggest you purchase one of the popular memory profilers and have at it. I've successfully used OptimizeIt to analyze and deduce memory leaks in WebLogic applications. Alternatively, I believe JRockit has memory profiling capabilities built into it, although I'm not familiar with it.

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