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how to generate thread dump java on out of memory error

  • does java 6 generate thread dump in addition to heap dump (java_pid14941.hprof)

  • this is what happened to one of my applications.

    java.lang.OutOfMemoryError: GC overhead limit exceeded Dumping heap to java_pid14941.hprof ...

  • I did find ava_pid14941.hprof in working directory, but didn't find any file which contains thread dump. I need to know what all the threads were doing when I got this OutOfMemory error.

  • Is there any configuration option which will generate thread dump in addition to heap dump on out of memory exception?

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If you're in a Linux/Unix environment you can do this:

-XX:OnOutOfMemoryError="kill -3 %p"

This way you don't have to have your application generate periodic thread dumps and you'll get a snapshot when it actually chokes.

With %p, you don't need to pass the PID, JVM will automatically pick the correct process id as mentioned here.


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