1 /*

     2  * Copyright (c) 2012, Oracle and/or its affiliates. All rights reserved.

     3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

     4  *

     5  * This code is free software; you can redistribute it and/or modify it

     6  * under the terms of the GNU General Public License version 2 only, as

     7  * published by the Free Software Foundation.

     8  *

     9  * This code is distributed in the hope that it will be useful, but WITHOUT

    10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

    11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

    12  * version 2 for more details (a copy is included in the LICENSE file that

    13  * accompanied this code).

    14  *

    15  * You should have received a copy of the GNU General Public License version

    16  * 2 along with this work; if not, write to the Free Software Foundation,

    17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

    18  *

    19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

    20  * or visit www.oracle.com if you need additional information or have any

    21  * questions.

    22  *

    23  */

    24 

    25 /*

    26  * @test

    27  * @bug 7196045

    28  * @summary Possible JVM deadlock in ThreadTimesClosure when using HotspotInternal non-public API.

    29  * @run main/othervm -XX:+UsePerfData Test7196045

    30  */

    31 

    32 import java.lang.management.ManagementFactory;

    33 import javax.management.JMException;

    34 import javax.management.MBeanServer;

    35 import javax.management.MalformedObjectNameException;

    36 import javax.management.ObjectName;

    37 

    38 public class Test7196045 {

    39 

    40     public static long duration = 1000 * 60 * 2;

    41     private static final String HOTSPOT_INTERNAL = "sun.management:type=HotspotInternal";

    42 

    43     public static void main(String[] args) {

    44 

    45         MBeanServer server = ManagementFactory.getPlatformMBeanServer();

    46         ObjectName objName= null;

    47         try {

    48             ObjectName hotspotInternal = new ObjectName(HOTSPOT_INTERNAL);

    49             try {

    50                 server.registerMBean(new sun.management.HotspotInternal(), hotspotInternal);

    51             } catch (JMException e) {

    52                 throw new RuntimeException("HotSpotWatcher: Failed to register the HotspotInternal MBean" + e);

    53             }

    54             objName= new ObjectName("sun.management:type=HotspotThreading");

    55 

    56         } catch (MalformedObjectNameException e1) {

    57             throw new RuntimeException("Bad object name" + e1);

    58         }

    59 

    60         long endTime = System.currentTimeMillis() + duration;

    61         long i = 0;

    62         while (true) {

    63             try {

    64                 server.getAttribute(objName, "InternalThreadCpuTimes");

    65             } catch (Exception ex) {

    66                 System.err.println("Exception while getting attribute: " + ex);

    67             }

    68             i++;

    69             if (i % 10000 == 0) {

    70                 System.out.println("Successful iterations: " + i);

    71             }

    72             if (System.currentTimeMillis() > endTime) {

    73                 break;

    74             }

    75         }

    76         System.out.println("PASSED.");

    77     }

    78 }