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

java.lang.management.ThreadMXBean.findMonitorDeadlockedThreads()
Finds cycles of threads that are in deadlock waiting to acquire object monitors. That is, threads that are blocked waiting to enter a synchronization block or waiting to reenter a synchronization block after an {@link Object#wait Object.wait} call, where each thread owns one monitor while trying to obtain another monitor already held by another thread in a cycle.
More formally, a thread is monitor deadlocked if it is part of a cycle in the relation "is waiting for an object monitor owned by". In the simplest case, thread A is blocked waiting for a monitor owned by thread B, and thread B is blocked waiting for a monitor owned by thread A.
This method is designed for troubleshooting use, but not for synchronization control. It might be an expensive operation.
This method finds deadlocks involving only object monitors. To find deadlocks involving both object monitors and ownable synchronizers, the {@link #findDeadlockedThreads findDeadlockedThreads} methodshould be used. @return an array of IDs of the threads that are monitordeadlocked, if any; null otherwise. @throws java.lang.SecurityException if a security managerexists and the caller does not have ManagementPermission("monitor"). @see #findDeadlockedThreads

    return dump.toString();
  }
  
  static String buildDeadlockInfo() {
    ThreadMXBean threadBean = ManagementFactory.getThreadMXBean();
    long[] threadIds = threadBean.findMonitorDeadlockedThreads();
    if (threadIds != null && threadIds.length > 0) {
      StringWriter stringWriter = new StringWriter();
      PrintWriter out = new PrintWriter(stringWriter);
      
      ThreadInfo[] infos = threadBean.getThreadInfo(threadIds, true, true);

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   * Checks if any threads are deadlocked. If any, print
   * the thread dump information.
   */
  public static boolean findDeadlock() {
     ThreadMXBean tmbean = ManagementFactory.getThreadMXBean();
     long[] tids = tmbean.findMonitorDeadlockedThreads();
     if (tids == null) { 
         return false;
     } else {
        StringWriter str = new StringWriter();
        PrintWriter log = new PrintWriter(str);

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        c1.get().write("start");


        ThreadMXBean threadMXBean = ManagementFactory.getThreadMXBean();


        while (!messageCount.await(100, TimeUnit.MILLISECONDS)) {
            long[] threads = threadMXBean.findMonitorDeadlockedThreads();


            if (null != threads) {
                StringBuffer sb = new StringBuffer(256);
                ThreadInfo[] infos = threadMXBean.getThreadInfo(threads, Integer.MAX_VALUE);

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        if(deadlocks != null && deadlocks.length > 0) {
            sb.append("deadlocked threads:\n");
            _printThreads(bean,deadlocks,sb);
        }


        deadlocks=bean.findMonitorDeadlockedThreads();
        if(deadlocks != null && deadlocks.length > 0) {
            sb.append("monitor deadlocked threads:\n");
            _printThreads(bean,deadlocks,sb);
        }
        return sb.toString();

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    nl.add( "daemon", tmbean.getDaemonThreadCount() );
    system.add( "threadCount", nl );
    
    // Deadlocks
    ThreadInfo[] tinfos;
    long[] tids = tmbean.findMonitorDeadlockedThreads();
    if (tids != null) {
      tinfos = tmbean.getThreadInfo(tids, Integer.MAX_VALUE);
      NamedList<SimpleOrderedMap<Object>> lst = new NamedList<SimpleOrderedMap<Object>>();
      for (ThreadInfo ti : tinfos) {
        lst.add( "thread", getThreadInfo( ti, tmbean ) );

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        writer.append(tid).append(" ");
      }
      writer.append("\n");
    }


    long[] deadLockMonitorTids = threadMXBean
        .findMonitorDeadlockedThreads();
    if (deadLockMonitorTids != null) {
      writer.append(threadIds.length + " deadlocked monitor threads:");
      for (long tid : deadLockMonitorTids) {
        writer.append(tid).append(" ");

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