Examples of java.lang.management.ThreadMXBean.findDeadlockedThreads()

java.lang.management.ThreadMXBean.findDeadlockedThreads()
Finds cycles of threads that are in deadlock waiting to acquire object monitors or ownable synchronizers. Threads are deadlocked in a cycle waiting for a lock of these two types if each thread owns one lock while trying to acquire another lock already held by another thread in the cycle.
This method is designed for troubleshooting use, but not for synchronization control. It might be an expensive operation. @return an array of IDs of the threads that are deadlocked waiting for object monitors or ownable synchronizers, if any; null otherwise. @throws java.lang.SecurityException if a security managerexists and the caller does not have ManagementPermission("monitor"). @throws java.lang.UnsupportedOperationException if the Java virtual machine does not support monitoriing of ownable synchronizer usage. @see #isSynchronizerUsageSupported @see #findMonitorDeadlockedThreads @since 1.6

    // Otherwise, it finds deadlocks involving both monitors and
    // the concurrent locks.
    public long[] findDeadlockedThreads() throws IOException {
        ThreadMXBean tm = getThreadMXBean();
        if (supportsLockUsage && tm.isSynchronizerUsageSupported()) {
            return tm.findDeadlockedThreads();
        } else {
            return tm.findMonitorDeadlockedThreads();
        }
    }

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        for (ThreadInfo threadInfo : threadInfos)
        {
            dump.append(threadInfo);
        }


        long[] deadLocks = threadMXBean.findDeadlockedThreads();
        if (deadLocks != null && deadLocks.length > 0)
        {
            ThreadInfo[] deadlockedThreads = threadMXBean.getThreadInfo(deadLocks);
            dump.append(String.format("%n"));
            dump.append("Deadlock is detected!");

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    }


    @Override
    public long[] findDeadlockedThreads() {
        ThreadMXBean threadMXBean = ManagementFactory.getThreadMXBean();
        return threadMXBean.findDeadlockedThreads();
    }


    @Override
    public boolean isEnabled() {
        return true;

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    }


    private void addThreadMetrics(List<MetricDatum> list) {
        ThreadMXBean threadMXBean = ManagementFactory.getThreadMXBean();
        int threadCount = threadMXBean.getThreadCount();
        long[] ids = threadMXBean.findDeadlockedThreads();
        int deadLockThreadCount = ids == null ? 0 : ids.length;
        int daemonThreadCount = threadMXBean.getDaemonThreadCount();
        int peakThreadCount = threadMXBean.getPeakThreadCount();
        long totalStartedThreadCount = threadMXBean.getTotalStartedThreadCount();
        long[] counts = {

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            System.out.println("Monitoring of synchronizer usage not supported")
;
            return;
        }


        long[] result = tmbean.findDeadlockedThreads();
        if (result != null) {
             throw new RuntimeException("TEST FAILED: result should be null");
        }
    }

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    }




    public static void checkDeadlockedThreads() throws IllegalThreadStateException {
        ThreadMXBean tmx = ManagementFactory.getThreadMXBean();
        long[] ids = tmx.findDeadlockedThreads();
        if (ids != null) {
            ThreadInfo[] infos = tmx.getThreadInfo(ids, true, true);
            String log = "The following threads are deadlocked:\n";
            for (ThreadInfo ti : infos) {
                System.out.println(ti);

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                    ConditionTimeoutException e = new ConditionTimeoutException(message);


                    ThreadMXBean bean = ManagementFactory.getThreadMXBean();
                    try {
                        long[] threadIds = bean.findDeadlockedThreads();
                        if (threadIds != null)
                            e.initCause(new DeadlockException(threadIds));
                    }
                    catch (UnsupportedOperationException ignored) {
                        // findDeadLockedThreads() not supported on this VM,

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        if(!executorService.isTerminated()) {
            /* uncomment this block to perform deadlock checking, only on java 1.6 */
            // Check for deadlock
            ThreadMXBean tmx = ManagementFactory.getThreadMXBean();
            long[] ids = tmx.findDeadlockedThreads();
            if (ids != null) {
                ThreadInfo[] infos = tmx.getThreadInfo(ids, true, true);
                
                System.err.println("*** Deadlocked threads");
                for (ThreadInfo ti : infos) {

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   */
  private static final class DeadLockDetectionTimerTask extends TimerTask {
    @Override
    public void run() {
      ThreadMXBean tmx = ManagementFactory.getThreadMXBean();
      long[] ids = tmx.findDeadlockedThreads();
      if (ids != null) {
        ThreadInfo[] infos = tmx.getThreadInfo(ids, true, true);
        StringBuilder text = new StringBuilder();
        text.append("The following threads are deadlocked:\n");
        for (ThreadInfo ti : infos) {

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      } catch (InterruptedException e) {
        Thread.currentThread().interrupt();
        dead = true;
      }
      ThreadMXBean tmx = ManagementFactory.getThreadMXBean();
      long[] ids = tmx.findDeadlockedThreads();
      if (ids != null) {
        ThreadInfo[] infos = tmx.getThreadInfo(ids, true, true);
        System.out.println("The following threads are deadlocked:");
        for (ThreadInfo ti : infos) {
          System.out.println(ti);

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