1 /*
   2  * Copyright (c) 2006, 2015, 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  *
  30  * @run main PostRegisterDeadlockTest2
  31  */
  32 
  33 import javax.management.*;
  34 
  35 public class PostRegisterDeadlockTest2 {
  36     private static String failed;
  37 
  38     public static interface EmptyMBean {}
  39 
  40     public static class Empty implements EmptyMBean, MBeanRegistration {
  41         public ObjectName preRegister(MBeanServer mbs, ObjectName on) {
  42             this.mbs = mbs;
  43             this.on = on;
  44             return on;
  45         }
  46         public void postRegister(Boolean done) {
  47             Thread t = new Thread() {
  48                 public void run() {
  49                     if (!mbs.isRegistered(on))
  50                         failed = "Not registered!";
  51                 }
  52             };
  53             t.start();
  54             try {
  55                 t.join(5000L);
  56             } catch (InterruptedException e) {
  57                 failed = "Interrupted: " + e;
  58             }
  59             if (t.isAlive())
  60                 failed = "Deadlock detected";
  61         }
  62         public void preDeregister() {}
  63         public void postDeregister() {}
  64 
  65         private MBeanServer mbs;
  66         private ObjectName on;
  67     }
  68 
  69     public static void main(String[] args) throws Exception {
  70         MBeanServer mbs = MBeanServerFactory.newMBeanServer();
  71         ObjectName on = new ObjectName("a:b=c");
  72         mbs.registerMBean(new Empty(), on);
  73         try {
  74             mbs.registerMBean(new Empty(), on);
  75             throw new Exception("FAILED: did not get expected exception");
  76         } catch (InstanceAlreadyExistsException e) {
  77             System.out.println("OK: got expected exception");
  78         }
  79         if (failed != null)
  80             throw new Exception("FAILED: " + failed);
  81         System.out.println("TEST PASSED");
  82     }
  83 }