Programmatic deadlock detection in java

Question

How can I programmatically detect that a deadlock has occurred in a Java program?

Answer 1

You can detect the deadlocked threads programmatically using ThreadMXBean class.Here is the code,

    ThreadMXBean bean = ManagementFactory.getThreadMXBean();

    long ids[] = bean.findMonitorDeadlockedThreads();

    if(ids != null)
    {
        ThreadInfo threadInfo[] = bean.getThreadInfo(ids);

        for (ThreadInfo threadInfo1 : threadInfo)
        {
            System.out.println(threadInfo1.getThreadId());    //Prints the ID of deadlocked thread

            System.out.println(threadInfo1.getThreadName());  //Prints the name of deadlocked thread

            System.out.println(threadInfo1.getLockName());    //Prints the string representation of an object for which thread has entered into deadlock.

            System.out.println(threadInfo1.getLockOwnerId());  //Prints the ID of thread which currently owns the object lock

            System.out.println(threadInfo1.getLockOwnerName());  //Prints name of the thread which currently owns the object lock.
        }
    }
    else
    {
        System.out.println("No Deadlocked Threads");
    }

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