> That sounds like you looked at ps or similar output, not a thread dump. Take an actual
JVM thread dump and see where the worker threads are during the busy periods.
Wrong, to identify the thread in question I looked with Sysinternals Process Explorer which
thread ID caused the 100% CPU. Then I looked up this thread ID in the Java thread dump. And
this was the thread named "VM Thread".
> Turn on GC logging to see if you are experiencing heap churn and heavy GC activity.
Thank you for the hint.
Michael
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