Problems with Server utilization and java

Dear all,
I am developing a page in JSP and make use of javabean to transfer data from one page to another within a session. The data in javabean are never been erased.
The problem is when the server runs for a long period of time, it becomes slower and the utilization is 99%. What happen is it and how can I solve it? Is it related to the memory allocated by the java?

Session data will only last as long as the servlet container allows. In most cases (eg Tomcat) this defaults to about 30 minutes, but can be changed. Check that the session timeout configuration in your servlet container hasn't been set to "never timeout".
Even if it had, I would have expected OutOfMemory errors rather than degrading performance. Although if the max heap size of the JVM has been set to a level higher than the RAM on the machine you could be getting excess page file usage.
This probably wouldn't put CPU utilization at 99% though.. I suspect this is a code related problem.
My best guess is one of two reasons:
1. Somewhere in your code, or someone elses, there is a loop that never ends.
2. There is a bug in the servlet container.
I don't know which servlet container you are using, but I have used Tomcat extensively and never seen this behaviour.
In terms of solving this problem, that's a tough one. I would try running the entire application within a profiling tool to see which threads are clogging up the processor. The Eclipse java IDE has a plugin called Eclipse Profiler which will allow you to track the utilization of code right down to the method level.
If it were me, I'd be running the entire web application with a profiler like Eclipse Profiler and waiting for it to start clogging, then see who the guilty code is.

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