Java Code Examples for java.lang.management.ThreadMXBean#isCurrentThreadCpuTimeSupported()

/** Enable / disable the thread CPU timing, if needed */
private synchronized static void init() {
    if (sInitialized) return;
    sMode = Mode.valueOf(System.getProperty("jprof", sMode.name()));
    if (sMode != Mode.wall) {
        try {
            ThreadMXBean bean = ManagementFactory.getThreadMXBean();
            if (!bean.isCurrentThreadCpuTimeSupported()) {
                Logger.getLogger(JProf.class).warn("Measuring " + sMode.name() + " time is not supported, falling back to wall time.");
                sMode = Mode.wall;
            }
            if (!bean.isThreadCpuTimeEnabled())
                bean.setThreadCpuTimeEnabled(true);
        } catch (UnsupportedOperationException e) {
            Logger.getLogger(JProf.class).error("Unable to measure " + sMode.name() + " time, falling back to wall time: " + e.getMessage());
            sMode = Mode.wall;
            sMode = Mode.wall;
        }
    }
    Logger.getLogger(JProf.class).info("Using " + sMode.name() + " time.");
    sInitialized = true;
}
 

/** Get CPU time in nanoseconds. */

private long getCpuTime( ) {
	ThreadMXBean bean;
	try {
		bean = ManagementFactory.getThreadMXBean( );
	} catch (Error e) {
		// not supported (happens in the by means of IKVM converted version (.net)
		return 0L;
	}
	return bean.isCurrentThreadCpuTimeSupported( ) ?
        bean.getCurrentThreadCpuTime( ) : 0L;
}
 

CpuClock() {
	ThreadMXBean mxBean = ManagementFactory.getThreadMXBean();
	if (mxBean.isCurrentThreadCpuTimeSupported()) {
		threadMXBean = mxBean;
	} else {
		threadMXBean = null;
	}
}
 

public long getSystemTime()
{
   ThreadMXBean bean = ManagementFactory.getThreadMXBean();

   return bean.isCurrentThreadCpuTimeSupported() ? 
      (bean.getCurrentThreadCpuTime() - bean.getCurrentThreadUserTime()) : 0L;
}
 

public long getCpuTime () {
    ThreadMXBean bean = ManagementFactory.getThreadMXBean();
    return bean.isCurrentThreadCpuTimeSupported() ? bean
            .getCurrentThreadCpuTime() : 0L;
}
 

public long getUserTime()
{
   ThreadMXBean bean = ManagementFactory.getThreadMXBean();
   return bean.isCurrentThreadCpuTimeSupported() ? bean.getCurrentThreadUserTime() : 0L;
}
 

public long getSystemTime() {
    ThreadMXBean bean = ManagementFactory.getThreadMXBean();
    return bean.isCurrentThreadCpuTimeSupported() ?
            (bean.getCurrentThreadCpuTime() - bean.getCurrentThreadUserTime()) : 0L;
}
 

public long getSystemTime() {
    ThreadMXBean bean = ManagementFactory.getThreadMXBean();
    return bean.isCurrentThreadCpuTimeSupported() ?
            (bean.getCurrentThreadCpuTime() - bean.getCurrentThreadUserTime()) : 0L;
}
 

public static long getCpuTime( ) {
    ThreadMXBean bean = ManagementFactory.getThreadMXBean( );
    return bean.isCurrentThreadCpuTimeSupported( ) ?
        bean.getCurrentThreadCpuTime( ) : 0L;
}
 

private final int doThreadMXBeanTest(MBeanServerConnection mbsc) {
    int errorCount = 0 ;
    System.out.println("---- ThreadMXBean") ;

    try {
        ObjectName threadName =
                new ObjectName(ManagementFactory.THREAD_MXBEAN_NAME) ;
        MBeanInfo mbInfo = mbsc.getMBeanInfo(threadName);
        errorCount += checkNonEmpty(mbInfo);
        System.out.println("getMBeanInfo\t\t" + mbInfo);
        ThreadMXBean thread = null ;

        thread =
                JMX.newMXBeanProxy(mbsc,
                threadName,
                ThreadMXBean.class) ;
        System.out.println("findMonitorDeadlockedThreads\t\t"
                + thread.findMonitorDeadlockedThreads());
        long[] threadIDs = thread.getAllThreadIds() ;
        System.out.println("getAllThreadIds\t\t"
                + threadIDs);

        for ( long threadID : threadIDs ) {
            System.out.println("getThreadInfo long\t\t"
                    + thread.getThreadInfo(threadID));
            System.out.println("getThreadInfo long, int\t\t"
                    + thread.getThreadInfo(threadID, 2));
        }

        System.out.println("getThreadInfo long[]\t\t"
                + thread.getThreadInfo(threadIDs));
        System.out.println("getThreadInfo long[], int\t\t"
                + thread.getThreadInfo(threadIDs, 2));
        System.out.println("getDaemonThreadCount\t\t"
                + thread.getDaemonThreadCount());
        System.out.println("getPeakThreadCount\t\t"
                + thread.getPeakThreadCount());
        System.out.println("getThreadCount\t\t"
                + thread.getThreadCount());
        System.out.println("getTotalStartedThreadCount\t\t"
                + thread.getTotalStartedThreadCount());
        boolean supported = thread.isThreadContentionMonitoringSupported() ;
        System.out.println("isThreadContentionMonitoringSupported\t\t"
                + supported);

        if ( supported ) {
            System.out.println("isThreadContentionMonitoringEnabled\t\t"
                    + thread.isThreadContentionMonitoringEnabled());
        }

        supported = thread.isThreadCpuTimeSupported() ;
        System.out.println("isThreadCpuTimeSupported\t\t"
                + supported);

        if ( supported ) {
            System.out.println("isThreadCpuTimeEnabled\t\t"
                    + thread.isThreadCpuTimeEnabled());

            for (long id : threadIDs) {
                System.out.println("getThreadCpuTime(" + id + ")\t\t"
                        + thread.getThreadCpuTime(id));
                System.out.println("getThreadUserTime(" + id + ")\t\t"
                        + thread.getThreadUserTime(id));
            }
        }

        supported = thread.isCurrentThreadCpuTimeSupported() ;
        System.out.println("isCurrentThreadCpuTimeSupported\t\t"
                + supported);

        if ( supported ) {
            System.out.println("getCurrentThreadCpuTime\t\t"
                    + thread.getCurrentThreadCpuTime());
            System.out.println("getCurrentThreadUserTime\t\t"
                    + thread.getCurrentThreadUserTime());
        }

        thread.resetPeakThreadCount() ;

        System.out.println("---- OK\n") ;
    } catch (Exception e) {
        Utils.printThrowable(e, true) ;
        errorCount++ ;
        System.out.println("---- ERROR\n") ;
    }

    return errorCount ;
}
 

/**
 * Tests for a potential timing attack. This test checks if there is a correlation between the
 * timing of signature generation and the size of the one-time key k. This is for example the case
 * if a double and add method is used for the point multiplication. The test fails if such a
 * correlation can be shown with high confidence. Further analysis will be necessary to determine
 * how easy it is to exploit the bias in a timing attack.
 */
// TODO(bleichen): Determine if there are exploitable providers.
//
// SunEC currently fails this test. Since ECDSA typically is used with EC groups whose order
// is 224 bits or larger, it is unclear whether the same attacks that apply to DSA are practical.
//
// The ECDSA implementation in BouncyCastle leaks information about k through timing too.
// The test has not been optimized to detect this bias. It would require about 5'000'000 samples,
// which is too much for a simple unit test.
//
// BouncyCastle uses FixedPointCombMultiplier for ECDSA. This is a method using
// precomputation. The implementation is not constant time, since the precomputation table
// contains the point at infinity and adding this point is faster than ordinary point additions.
// The timing leak only has a small correlation to the size of k and at the moment it is is very
// unclear if the can be exploited. (Randomizing the precomputation table by adding the same
// random point to each element in the table and precomputing the necessary offset to undo the
// precomputation seems much easier than analyzing this.)
public void testTiming(String algorithm, String curve, ECParameterSpec ecParams)
    throws Exception {
  ThreadMXBean bean = ManagementFactory.getThreadMXBean();
  if (!bean.isCurrentThreadCpuTimeSupported()) {
    System.out.println("getCurrentThreadCpuTime is not supported. Skipping");
    return;
  }
  KeyPairGenerator keyGen = KeyPairGenerator.getInstance("EC");
  try {
    keyGen.initialize(ecParams);
  } catch (InvalidAlgorithmParameterException ex) {
    System.out.println("This provider does not support curve:" + curve);
    return;
  }
  KeyPair keyPair = keyGen.generateKeyPair();
  ECPrivateKey priv = (ECPrivateKey) keyPair.getPrivate();

  String message = "Hello";
  String hashAlgorithm = getHashAlgorithm(algorithm);
  byte[] messageBytes = message.getBytes("UTF-8");
  byte[] digest = MessageDigest.getInstance(hashAlgorithm).digest(messageBytes);
  BigInteger h = new BigInteger(1, digest);
  Signature signer = Signature.getInstance(algorithm);
  signer.initSign(priv);
  // The number of samples used for the test. This number is a bit low.
  // I.e. it just barely detects that SunEC leaks information about the size of k.
  int samples = 50000;
  long[] timing = new long[samples];
  BigInteger[] k = new BigInteger[samples];
  for (int i = 0; i < samples; i++) {
    long start = bean.getCurrentThreadCpuTime();
    signer.update(messageBytes);
    byte[] signature = signer.sign();
    timing[i] = bean.getCurrentThreadCpuTime() - start;
    k[i] = extractK(signature, h, priv);
  }
  long[] sorted = Arrays.copyOf(timing, timing.length);
  Arrays.sort(sorted);
  double n = priv.getParams().getOrder().doubleValue();
  double expectedAverage = n / 2;
  double maxSigma = 0;
  System.out.println("testTiming algorithm:" + algorithm);
  for (int idx = samples - 1; idx > 10; idx /= 2) {
    long cutoff = sorted[idx];
    int count = 0;
    BigInteger total = BigInteger.ZERO;
    for (int i = 0; i < samples; i++) {
      if (timing[i] <= cutoff) {
        total = total.add(k[i]);
        count += 1;
      }
    }
    double expectedStdDev = n / Math.sqrt(12 * count);
    double average = total.doubleValue() / count;
    // Number of standard deviations that the average is away from
    // the expected value:
    double sigmas = Math.abs(expectedAverage - average) / expectedStdDev;
    if (sigmas > maxSigma) {
      maxSigma = sigmas;
    }
    System.out.println(
        "count:"
            + count
            + " cutoff:"
            + cutoff
            + " relative average:"
            + (average / expectedAverage)
            + " sigmas:"
            + sigmas);
  }
  // Checks if the signatures with a small timing have a biased k.
  // We use 7 standard deviations, so that the probability of a false positive is smaller
  // than 10^{-10}.
  if (maxSigma >= 7) {
    fail("Signatures with short timing have a biased k");
  }
}
 

private final int doThreadMXBeanTest(MBeanServerConnection mbsc) {
    int errorCount = 0 ;
    System.out.println("---- ThreadMXBean") ;

    try {
        ObjectName threadName =
                new ObjectName(ManagementFactory.THREAD_MXBEAN_NAME) ;
        MBeanInfo mbInfo = mbsc.getMBeanInfo(threadName);
        errorCount += checkNonEmpty(mbInfo);
        System.out.println("getMBeanInfo\t\t" + mbInfo);
        ThreadMXBean thread = null ;

        thread =
                JMX.newMXBeanProxy(mbsc,
                threadName,
                ThreadMXBean.class) ;
        System.out.println("findMonitorDeadlockedThreads\t\t"
                + thread.findMonitorDeadlockedThreads());
        long[] threadIDs = thread.getAllThreadIds() ;
        System.out.println("getAllThreadIds\t\t"
                + threadIDs);

        for ( long threadID : threadIDs ) {
            System.out.println("getThreadInfo long\t\t"
                    + thread.getThreadInfo(threadID));
            System.out.println("getThreadInfo long, int\t\t"
                    + thread.getThreadInfo(threadID, 2));
        }

        System.out.println("getThreadInfo long[]\t\t"
                + thread.getThreadInfo(threadIDs));
        System.out.println("getThreadInfo long[], int\t\t"
                + thread.getThreadInfo(threadIDs, 2));
        System.out.println("getDaemonThreadCount\t\t"
                + thread.getDaemonThreadCount());
        System.out.println("getPeakThreadCount\t\t"
                + thread.getPeakThreadCount());
        System.out.println("getThreadCount\t\t"
                + thread.getThreadCount());
        System.out.println("getTotalStartedThreadCount\t\t"
                + thread.getTotalStartedThreadCount());
        boolean supported = thread.isThreadContentionMonitoringSupported() ;
        System.out.println("isThreadContentionMonitoringSupported\t\t"
                + supported);

        if ( supported ) {
            System.out.println("isThreadContentionMonitoringEnabled\t\t"
                    + thread.isThreadContentionMonitoringEnabled());
        }

        supported = thread.isThreadCpuTimeSupported() ;
        System.out.println("isThreadCpuTimeSupported\t\t"
                + supported);

        if ( supported ) {
            System.out.println("isThreadCpuTimeEnabled\t\t"
                    + thread.isThreadCpuTimeEnabled());

            for (long id : threadIDs) {
                System.out.println("getThreadCpuTime(" + id + ")\t\t"
                        + thread.getThreadCpuTime(id));
                System.out.println("getThreadUserTime(" + id + ")\t\t"
                        + thread.getThreadUserTime(id));
            }
        }

        supported = thread.isCurrentThreadCpuTimeSupported() ;
        System.out.println("isCurrentThreadCpuTimeSupported\t\t"
                + supported);

        if ( supported ) {
            System.out.println("getCurrentThreadCpuTime\t\t"
                    + thread.getCurrentThreadCpuTime());
            System.out.println("getCurrentThreadUserTime\t\t"
                    + thread.getCurrentThreadUserTime());
        }

        thread.resetPeakThreadCount() ;

        System.out.println("---- OK\n") ;
    } catch (Exception e) {
        Utils.printThrowable(e, true) ;
        errorCount++ ;
        System.out.println("---- ERROR\n") ;
    }

    return errorCount ;
}
 

private final int doThreadMXBeanTest(MBeanServerConnection mbsc) {
    int errorCount = 0 ;
    System.out.println("---- ThreadMXBean") ;

    try {
        ObjectName threadName =
                new ObjectName(ManagementFactory.THREAD_MXBEAN_NAME) ;
        MBeanInfo mbInfo = mbsc.getMBeanInfo(threadName);
        errorCount += checkNonEmpty(mbInfo);
        System.out.println("getMBeanInfo\t\t" + mbInfo);
        ThreadMXBean thread = null ;

        thread =
                JMX.newMXBeanProxy(mbsc,
                threadName,
                ThreadMXBean.class) ;
        System.out.println("findMonitorDeadlockedThreads\t\t"
                + thread.findMonitorDeadlockedThreads());
        long[] threadIDs = thread.getAllThreadIds() ;
        System.out.println("getAllThreadIds\t\t"
                + threadIDs);

        for ( long threadID : threadIDs ) {
            System.out.println("getThreadInfo long\t\t"
                    + thread.getThreadInfo(threadID));
            System.out.println("getThreadInfo long, int\t\t"
                    + thread.getThreadInfo(threadID, 2));
        }

        System.out.println("getThreadInfo long[]\t\t"
                + thread.getThreadInfo(threadIDs));
        System.out.println("getThreadInfo long[], int\t\t"
                + thread.getThreadInfo(threadIDs, 2));
        System.out.println("getDaemonThreadCount\t\t"
                + thread.getDaemonThreadCount());
        System.out.println("getPeakThreadCount\t\t"
                + thread.getPeakThreadCount());
        System.out.println("getThreadCount\t\t"
                + thread.getThreadCount());
        System.out.println("getTotalStartedThreadCount\t\t"
                + thread.getTotalStartedThreadCount());
        boolean supported = thread.isThreadContentionMonitoringSupported() ;
        System.out.println("isThreadContentionMonitoringSupported\t\t"
                + supported);

        if ( supported ) {
            System.out.println("isThreadContentionMonitoringEnabled\t\t"
                    + thread.isThreadContentionMonitoringEnabled());
        }

        supported = thread.isThreadCpuTimeSupported() ;
        System.out.println("isThreadCpuTimeSupported\t\t"
                + supported);

        if ( supported ) {
            System.out.println("isThreadCpuTimeEnabled\t\t"
                    + thread.isThreadCpuTimeEnabled());

            for (long id : threadIDs) {
                System.out.println("getThreadCpuTime(" + id + ")\t\t"
                        + thread.getThreadCpuTime(id));
                System.out.println("getThreadUserTime(" + id + ")\t\t"
                        + thread.getThreadUserTime(id));
            }
        }

        supported = thread.isCurrentThreadCpuTimeSupported() ;
        System.out.println("isCurrentThreadCpuTimeSupported\t\t"
                + supported);

        if ( supported ) {
            System.out.println("getCurrentThreadCpuTime\t\t"
                    + thread.getCurrentThreadCpuTime());
            System.out.println("getCurrentThreadUserTime\t\t"
                    + thread.getCurrentThreadUserTime());
        }

        thread.resetPeakThreadCount() ;

        System.out.println("---- OK\n") ;
    } catch (Exception e) {
        Utils.printThrowable(e, true) ;
        errorCount++ ;
        System.out.println("---- ERROR\n") ;
    }

    return errorCount ;
}
 

private final int doThreadMXBeanTest(MBeanServerConnection mbsc) {
    int errorCount = 0 ;
    System.out.println("---- ThreadMXBean") ;

    try {
        ObjectName threadName =
                new ObjectName(ManagementFactory.THREAD_MXBEAN_NAME) ;
        MBeanInfo mbInfo = mbsc.getMBeanInfo(threadName);
        errorCount += checkNonEmpty(mbInfo);
        System.out.println("getMBeanInfo\t\t" + mbInfo);
        ThreadMXBean thread = null ;

        thread =
                JMX.newMXBeanProxy(mbsc,
                threadName,
                ThreadMXBean.class) ;
        System.out.println("findMonitorDeadlockedThreads\t\t"
                + thread.findMonitorDeadlockedThreads());
        long[] threadIDs = thread.getAllThreadIds() ;
        System.out.println("getAllThreadIds\t\t"
                + threadIDs);

        for ( long threadID : threadIDs ) {
            System.out.println("getThreadInfo long\t\t"
                    + thread.getThreadInfo(threadID));
            System.out.println("getThreadInfo long, int\t\t"
                    + thread.getThreadInfo(threadID, 2));
        }

        System.out.println("getThreadInfo long[]\t\t"
                + thread.getThreadInfo(threadIDs));
        System.out.println("getThreadInfo long[], int\t\t"
                + thread.getThreadInfo(threadIDs, 2));
        System.out.println("getDaemonThreadCount\t\t"
                + thread.getDaemonThreadCount());
        System.out.println("getPeakThreadCount\t\t"
                + thread.getPeakThreadCount());
        System.out.println("getThreadCount\t\t"
                + thread.getThreadCount());
        System.out.println("getTotalStartedThreadCount\t\t"
                + thread.getTotalStartedThreadCount());
        boolean supported = thread.isThreadContentionMonitoringSupported() ;
        System.out.println("isThreadContentionMonitoringSupported\t\t"
                + supported);

        if ( supported ) {
            System.out.println("isThreadContentionMonitoringEnabled\t\t"
                    + thread.isThreadContentionMonitoringEnabled());
        }

        supported = thread.isThreadCpuTimeSupported() ;
        System.out.println("isThreadCpuTimeSupported\t\t"
                + supported);

        if ( supported ) {
            System.out.println("isThreadCpuTimeEnabled\t\t"
                    + thread.isThreadCpuTimeEnabled());

            for (long id : threadIDs) {
                System.out.println("getThreadCpuTime(" + id + ")\t\t"
                        + thread.getThreadCpuTime(id));
                System.out.println("getThreadUserTime(" + id + ")\t\t"
                        + thread.getThreadUserTime(id));
            }
        }

        supported = thread.isCurrentThreadCpuTimeSupported() ;
        System.out.println("isCurrentThreadCpuTimeSupported\t\t"
                + supported);

        if ( supported ) {
            System.out.println("getCurrentThreadCpuTime\t\t"
                    + thread.getCurrentThreadCpuTime());
            System.out.println("getCurrentThreadUserTime\t\t"
                    + thread.getCurrentThreadUserTime());
        }

        thread.resetPeakThreadCount() ;

        System.out.println("---- OK\n") ;
    } catch (Exception e) {
        Utils.printThrowable(e, true) ;
        errorCount++ ;
        System.out.println("---- ERROR\n") ;
    }

    return errorCount ;
}
 

private final int doThreadMXBeanTest(MBeanServerConnection mbsc) {
    int errorCount = 0 ;
    System.out.println("---- ThreadMXBean") ;

    try {
        ObjectName threadName =
                new ObjectName(ManagementFactory.THREAD_MXBEAN_NAME) ;
        MBeanInfo mbInfo = mbsc.getMBeanInfo(threadName);
        errorCount += checkNonEmpty(mbInfo);
        System.out.println("getMBeanInfo\t\t" + mbInfo);
        ThreadMXBean thread = null ;

        thread =
                JMX.newMXBeanProxy(mbsc,
                threadName,
                ThreadMXBean.class) ;
        System.out.println("findMonitorDeadlockedThreads\t\t"
                + thread.findMonitorDeadlockedThreads());
        long[] threadIDs = thread.getAllThreadIds() ;
        System.out.println("getAllThreadIds\t\t"
                + threadIDs);

        for ( long threadID : threadIDs ) {
            System.out.println("getThreadInfo long\t\t"
                    + thread.getThreadInfo(threadID));
            System.out.println("getThreadInfo long, int\t\t"
                    + thread.getThreadInfo(threadID, 2));
        }

        System.out.println("getThreadInfo long[]\t\t"
                + thread.getThreadInfo(threadIDs));
        System.out.println("getThreadInfo long[], int\t\t"
                + thread.getThreadInfo(threadIDs, 2));
        System.out.println("getDaemonThreadCount\t\t"
                + thread.getDaemonThreadCount());
        System.out.println("getPeakThreadCount\t\t"
                + thread.getPeakThreadCount());
        System.out.println("getThreadCount\t\t"
                + thread.getThreadCount());
        System.out.println("getTotalStartedThreadCount\t\t"
                + thread.getTotalStartedThreadCount());
        boolean supported = thread.isThreadContentionMonitoringSupported() ;
        System.out.println("isThreadContentionMonitoringSupported\t\t"
                + supported);

        if ( supported ) {
            System.out.println("isThreadContentionMonitoringEnabled\t\t"
                    + thread.isThreadContentionMonitoringEnabled());
        }

        supported = thread.isThreadCpuTimeSupported() ;
        System.out.println("isThreadCpuTimeSupported\t\t"
                + supported);

        if ( supported ) {
            System.out.println("isThreadCpuTimeEnabled\t\t"
                    + thread.isThreadCpuTimeEnabled());

            for (long id : threadIDs) {
                System.out.println("getThreadCpuTime(" + id + ")\t\t"
                        + thread.getThreadCpuTime(id));
                System.out.println("getThreadUserTime(" + id + ")\t\t"
                        + thread.getThreadUserTime(id));
            }
        }

        supported = thread.isCurrentThreadCpuTimeSupported() ;
        System.out.println("isCurrentThreadCpuTimeSupported\t\t"
                + supported);

        if ( supported ) {
            System.out.println("getCurrentThreadCpuTime\t\t"
                    + thread.getCurrentThreadCpuTime());
            System.out.println("getCurrentThreadUserTime\t\t"
                    + thread.getCurrentThreadUserTime());
        }

        thread.resetPeakThreadCount() ;

        System.out.println("---- OK\n") ;
    } catch (Exception e) {
        Utils.printThrowable(e, true) ;
        errorCount++ ;
        System.out.println("---- ERROR\n") ;
    }

    return errorCount ;
}
 

private final int doThreadMXBeanTest(MBeanServerConnection mbsc) {
    int errorCount = 0 ;
    System.out.println("---- ThreadMXBean") ;

    try {
        ObjectName threadName =
                new ObjectName(ManagementFactory.THREAD_MXBEAN_NAME) ;
        MBeanInfo mbInfo = mbsc.getMBeanInfo(threadName);
        errorCount += checkNonEmpty(mbInfo);
        System.out.println("getMBeanInfo\t\t" + mbInfo);
        ThreadMXBean thread = null ;

        thread =
                JMX.newMXBeanProxy(mbsc,
                threadName,
                ThreadMXBean.class) ;
        System.out.println("findMonitorDeadlockedThreads\t\t"
                + thread.findMonitorDeadlockedThreads());
        long[] threadIDs = thread.getAllThreadIds() ;
        System.out.println("getAllThreadIds\t\t"
                + threadIDs);

        for ( long threadID : threadIDs ) {
            System.out.println("getThreadInfo long\t\t"
                    + thread.getThreadInfo(threadID));
            System.out.println("getThreadInfo long, int\t\t"
                    + thread.getThreadInfo(threadID, 2));
        }

        System.out.println("getThreadInfo long[]\t\t"
                + thread.getThreadInfo(threadIDs));
        System.out.println("getThreadInfo long[], int\t\t"
                + thread.getThreadInfo(threadIDs, 2));
        System.out.println("getDaemonThreadCount\t\t"
                + thread.getDaemonThreadCount());
        System.out.println("getPeakThreadCount\t\t"
                + thread.getPeakThreadCount());
        System.out.println("getThreadCount\t\t"
                + thread.getThreadCount());
        System.out.println("getTotalStartedThreadCount\t\t"
                + thread.getTotalStartedThreadCount());
        boolean supported = thread.isThreadContentionMonitoringSupported() ;
        System.out.println("isThreadContentionMonitoringSupported\t\t"
                + supported);

        if ( supported ) {
            System.out.println("isThreadContentionMonitoringEnabled\t\t"
                    + thread.isThreadContentionMonitoringEnabled());
        }

        supported = thread.isThreadCpuTimeSupported() ;
        System.out.println("isThreadCpuTimeSupported\t\t"
                + supported);

        if ( supported ) {
            System.out.println("isThreadCpuTimeEnabled\t\t"
                    + thread.isThreadCpuTimeEnabled());

            for (long id : threadIDs) {
                System.out.println("getThreadCpuTime(" + id + ")\t\t"
                        + thread.getThreadCpuTime(id));
                System.out.println("getThreadUserTime(" + id + ")\t\t"
                        + thread.getThreadUserTime(id));
            }
        }

        supported = thread.isCurrentThreadCpuTimeSupported() ;
        System.out.println("isCurrentThreadCpuTimeSupported\t\t"
                + supported);

        if ( supported ) {
            System.out.println("getCurrentThreadCpuTime\t\t"
                    + thread.getCurrentThreadCpuTime());
            System.out.println("getCurrentThreadUserTime\t\t"
                    + thread.getCurrentThreadUserTime());
        }

        thread.resetPeakThreadCount() ;

        System.out.println("---- OK\n") ;
    } catch (Exception e) {
        Utils.printThrowable(e, true) ;
        errorCount++ ;
        System.out.println("---- ERROR\n") ;
    }

    return errorCount ;
}
 

private final int doThreadMXBeanTest(MBeanServerConnection mbsc) {
    int errorCount = 0 ;
    System.out.println("---- ThreadMXBean") ;

    try {
        ObjectName threadName =
                new ObjectName(ManagementFactory.THREAD_MXBEAN_NAME) ;
        MBeanInfo mbInfo = mbsc.getMBeanInfo(threadName);
        errorCount += checkNonEmpty(mbInfo);
        System.out.println("getMBeanInfo\t\t" + mbInfo);
        ThreadMXBean thread = null ;

        thread =
                JMX.newMXBeanProxy(mbsc,
                threadName,
                ThreadMXBean.class) ;
        System.out.println("findMonitorDeadlockedThreads\t\t"
                + thread.findMonitorDeadlockedThreads());
        long[] threadIDs = thread.getAllThreadIds() ;
        System.out.println("getAllThreadIds\t\t"
                + threadIDs);

        for ( long threadID : threadIDs ) {
            System.out.println("getThreadInfo long\t\t"
                    + thread.getThreadInfo(threadID));
            System.out.println("getThreadInfo long, int\t\t"
                    + thread.getThreadInfo(threadID, 2));
        }

        System.out.println("getThreadInfo long[]\t\t"
                + thread.getThreadInfo(threadIDs));
        System.out.println("getThreadInfo long[], int\t\t"
                + thread.getThreadInfo(threadIDs, 2));
        System.out.println("getDaemonThreadCount\t\t"
                + thread.getDaemonThreadCount());
        System.out.println("getPeakThreadCount\t\t"
                + thread.getPeakThreadCount());
        System.out.println("getThreadCount\t\t"
                + thread.getThreadCount());
        System.out.println("getTotalStartedThreadCount\t\t"
                + thread.getTotalStartedThreadCount());
        boolean supported = thread.isThreadContentionMonitoringSupported() ;
        System.out.println("isThreadContentionMonitoringSupported\t\t"
                + supported);

        if ( supported ) {
            System.out.println("isThreadContentionMonitoringEnabled\t\t"
                    + thread.isThreadContentionMonitoringEnabled());
        }

        supported = thread.isThreadCpuTimeSupported() ;
        System.out.println("isThreadCpuTimeSupported\t\t"
                + supported);

        if ( supported ) {
            System.out.println("isThreadCpuTimeEnabled\t\t"
                    + thread.isThreadCpuTimeEnabled());

            for (long id : threadIDs) {
                System.out.println("getThreadCpuTime(" + id + ")\t\t"
                        + thread.getThreadCpuTime(id));
                System.out.println("getThreadUserTime(" + id + ")\t\t"
                        + thread.getThreadUserTime(id));
            }
        }

        supported = thread.isCurrentThreadCpuTimeSupported() ;
        System.out.println("isCurrentThreadCpuTimeSupported\t\t"
                + supported);

        if ( supported ) {
            System.out.println("getCurrentThreadCpuTime\t\t"
                    + thread.getCurrentThreadCpuTime());
            System.out.println("getCurrentThreadUserTime\t\t"
                    + thread.getCurrentThreadUserTime());
        }

        thread.resetPeakThreadCount() ;

        System.out.println("---- OK\n") ;
    } catch (Exception e) {
        Utils.printThrowable(e, true) ;
        errorCount++ ;
        System.out.println("---- ERROR\n") ;
    }

    return errorCount ;
}
 

/**
 * Returns the current thread's CPU time.
 * 
 * @return the current thread's CPU time, or 0 if CPU time is not supported
 *     for the current thread
 */
public static long getCpuTime() {
    final ThreadMXBean bean = ManagementFactory.getThreadMXBean();
    return bean.isCurrentThreadCpuTimeSupported() ? bean.getCurrentThreadCpuTime() : 0L;
}
 

/**
 * Returns the current thread's user time.
 * 
 * @return the current thread's user time, or 0 if user time is not supported
 *     for the current thread
 */
public static long getUserTime() {
    final ThreadMXBean bean = ManagementFactory.getThreadMXBean();
    return bean.isCurrentThreadCpuTimeSupported() ? bean.getCurrentThreadUserTime() : 0L;
}
 

/**
 * Returns the difference between the current thread's CPU time and user time.
 * 
 * @return the current thread's system time, or 0 if CPU time is not supported
 *     for the current thread
 */
public static long getSystemTime() {
    final ThreadMXBean bean = ManagementFactory.getThreadMXBean();
    final long systemTime = bean.getCurrentThreadCpuTime() - bean.getCurrentThreadUserTime();
    return bean.isCurrentThreadCpuTimeSupported() ? systemTime : 0L;
}