tomcat using 100% cpu

[eric zhao]

Our tomcat is hosting a couple JSP and Servlet that would make connection to SQLServer and calling xalan to parse XML. We checked our code to make sure all database connections are closed. However, after a few days, tomcat will use up all the cpu and has to be restarted.
Any idea where we should look at to find out what the problem is?
Thanks.

[Andy Bowes]

I doubt that this is really a Tomcat error it's much more likely to be a 'feature' of your application. The most frequent cause of 100% CPU useage is a loop that never terminates. Have a look for while() loops whose exit condition is never being set.
I think your statement about DB connections is a bit of a false trail. If you run out of DB connections applications tend to freeze and you don't usually see a high CPU useage