debugging JBoss 100% CPU usage

Question

Originally posted on Server Fault, where it was suggested this question might better asked here.

We are using JBoss to run two of our WARs. One is our web app, the other

Answer 1

I think you should definitely try to set up a test environment with some load testing in order to reproduce your issue. Profiling would definitely help in order to pinpoint the problem.

A quick fix would be to next time kill jboss with kill -3 in order get a dump to analyze. Second thing I would check is that you are running with -server flags and that your gc settings are sane. You could also just run some dstat to see what the process is doing during the lockup. But again - it is probably safer to just set up a load testing environment (via EC2 or so) to reproduce this.