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I have an app server process that’s constantly at 100% CPU. By constantly I mean hours, or even days.
I know how to generate a heap/thread dump, but I’m looking for more dynamic information. I would like to know what is using so much CPU in there. There are tens (or probably 100+) threads. I know what those threads are, but I need to know which of them are using my CPU so much.
How can I obtain this information?
Use a profiler. There is one included in VisualVM which comes with the Oracle JDK.
An advanced commercial one (trial licenses available) is YourKit.