1 /*
   2  * Copyright (c) 2006, 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  * @test
  26  * @bug 6417044
  27  * @summary Test that a failing MBean registration does not lead to a deadlock
  28  * @author Eamonn McManus
  29  * @run main PostRegisterDeadlockTest2
  30  */
  31 
  32 import javax.management.*;
  33 
  34 public class PostRegisterDeadlockTest2 {
  35     private static String failed;
  36 
  37     public static interface EmptyMBean {}
  38 
  39     public static class Empty implements EmptyMBean, MBeanRegistration {
  40         public ObjectName preRegister(MBeanServer mbs, ObjectName on) {
  41             this.mbs = mbs;
  42             this.on = on;
  43             return on;
  44         }
  45         public void postRegister(Boolean done) {
  46             Thread t = new Thread() {
  47                 public void run() {
  48                     if (!mbs.isRegistered(on))
  49                         failed = "Not registered!";
  50                 }
  51             };
  52             t.start();
  53             try {
  54                 t.join(5000L);
  55             } catch (InterruptedException e) {
  56                 failed = "Interrupted: " + e;
  57             }
  58             if (t.isAlive())
  59                 failed = "Deadlock detected";
  60         }
  61         public void preDeregister() {}
  62         public void postDeregister() {}
  63 
  64         private MBeanServer mbs;
  65         private ObjectName on;
  66     }
  67 
  68     public static void main(String[] args) throws Exception {
  69         MBeanServer mbs = MBeanServerFactory.newMBeanServer();
  70         ObjectName on = new ObjectName("a:b=c");
  71         mbs.registerMBean(new Empty(), on);
  72         try {
  73             mbs.registerMBean(new Empty(), on);
  74             throw new Exception("FAILED: did not get expected exception");
  75         } catch (InstanceAlreadyExistsException e) {
  76             System.out.println("OK: got expected exception");
  77         }
  78         if (failed != null)
  79             throw new Exception("FAILED: " + failed);
  80         System.out.println("TEST PASSED");
  81     }
  82 }