Matching Java thread-ID to native Linux PID

Question

I need to match java thread ids to its native linux pids. I can't use kill -3 <PID> because I don't own to output stream or jstack <PID> because I'm running with JRE and not JDK.

Tried pstack from the linux side, and JVM Management classes from java side - without any success.

Your assistance is appreciated.

Thanks.

Check this: http://stackoverflow.com/questions/11224394/obtaining-the-thread-id-for-java-threads-in-linux — Juned Ahsan, Oct 08 '13 at 15:39

score 3 · Answer 1 · edited May 23 '17 at 10:31

The Thread id is not related to the underlying OS thread id. It is a value assigned to that Thread instance from a static counter.

/* For generating thread ID */
private static long threadSeqNumber;

private static synchronized long nextThreadID() {
    return ++threadSeqNumber;
}

You will need to use some native call to get the actual value, possibly with what's proposed in Juned's link in the comments.

Matching Java thread-ID to native Linux PID

1 Answers1