List of findMonitorDeadlockedThreads() Examples

Examples of 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

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


        out.println("<pre>");


        out.println("Report generated at " + new java.util.Date());


        long[] deadLockedIds = mx.findMonitorDeadlockedThreads();
        ThreadInfo[] infos;
        if (deadLockedIds != null) {
            infos = mx.getThreadInfo(deadLockedIds, Integer.MAX_VALUE);
            out.println("\nDead locks:");
            for (int i = 0; i < infos.length; i++) {

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

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

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

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

        return dumper.toString();
    }


    public static String getDeadlockedThreads() {
        ThreadMXBean bean = ManagementFactory.getThreadMXBean();
        long[] deadlocked = bean.findMonitorDeadlockedThreads();
        if (deadlocked == null || deadlocked.length == 0) {
            return "";
        }


        String buf = "Deadlocked thread IDs: ";

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

            if (deadlockedThreads == null || deadlockedThreads.length == 0) {
                return null;
            }
            return threadMXBean.getThreadInfo(deadlockedThreads, true, true);
        } else {
            long[] monitorDeadlockedThreads = threadMXBean.findMonitorDeadlockedThreads();
            return getThreadInfos(threadMXBean, monitorDeadlockedThreads);
        }
    }


    public static ThreadInfo[] getAllThreads() {

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

        Map<String, Object> threadInfoMap = new HashMap<String, Object>(); // more to come ;)
        threadInfoMap.put("peak_thread_count", threadMXBean.getPeakThreadCount());
        threadInfoMap.put("thread_count", threadMXBean.getThreadCount());
        threadInfoMap.put("total_started_thread_count", threadMXBean.getTotalStartedThreadCount());


        long[] deadlockedThreads = threadMXBean.findMonitorDeadlockedThreads();
        threadInfoMap.put("dead_locked_thread_count", deadlockedThreads != null ? deadlockedThreads.length : 0);
        systemInfo.put("thread_info", threadInfoMap);




        JSONObject sysinfoJson = new JSONObject(Collections.singletonMap("system_info", systemInfo));

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


        // use jmx to do deadlock detection
        try {
            final ThreadMXBean mbean = ManagementFactory.getThreadMXBean();
            while (ai.get() > 0) {
                long[] deadlockedThreads = mbean.findMonitorDeadlockedThreads();
                if (deadlockedThreads != null && deadlockedThreads.length > 0) {
                    fail("Deadlock detected between the following threads: "
                            + Arrays.toString(deadlockedThreads));
                }
                // sleep for a bit

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


        // use jmx to do deadlock detection
        try {
            final ThreadMXBean mbean = ManagementFactory.getThreadMXBean();
            while (ai.get() > 0) {
                long[] deadlockedThreads = mbean.findMonitorDeadlockedThreads();
                if (deadlockedThreads != null && deadlockedThreads.length > 0) {
                    fail("Deadlock detected between the following threads: "
                            + Arrays.toString(deadlockedThreads));
                }
                // sleep for a bit

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

    // Check for thread deadlock and exit if it occurs.
    // TODO: Can we clean up the deadlocked threads?
    ThreadMXBean tmx = ManagementFactory.getThreadMXBean();
    while (thread1.isAlive() && thread2.isAlive()) {
      try { Thread.sleep(20); } catch (InterruptedException e) {}
      long[] ids = tmx.findMonitorDeadlockedThreads();
      if (ids != null) {
        ThreadInfo[] infos = tmx.getThreadInfo(ids);
        // TODO: Use logging instead?
        System.out.println("The following threads are deadlocked:");
        for (ThreadInfo ti : infos) {

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