1 /*
   2  * Copyright (c) 2004, 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     5058327
  27  * @summary Test if getThreadInfo(long[]) returns a ThreadInfo[]
  28  *          with null elements with no exception.
  29  *
  30  * @author  Mandy Chung
  31  *
  32  * @build ThreadInfoArray
  33  * @run main ThreadInfoArray
  34  */
  35 
  36 import java.lang.management.*;
  37 import javax.management.*;
  38 import java.util.*;
  39 import static java.lang.management.ManagementFactory.*;
  40 
  41 public class ThreadInfoArray {
  42     public static void main(String[] argv) throws Exception {
  43         ThreadMXBean mbean = ManagementFactory.getThreadMXBean();
  44 
  45         // ID for a new thread
  46         long [] ids = {new Thread().getId()};
  47         ThreadInfo[] tinfos = mbean.getThreadInfo(ids);
  48 
  49         if (tinfos[0] != null) {
  50             throw new RuntimeException("TEST FAILED: " +
  51                 "Expected to have a null element");
  52         }
  53 
  54         // call getThreadInfo through MBeanServer
  55         MBeanServer mbs = ManagementFactory.getPlatformMBeanServer();
  56         ObjectName on = new ObjectName(THREAD_MXBEAN_NAME);
  57         Object[] params = {ids};
  58         String[] sigs = {"[J"};
  59         Object[] result = (Object[]) mbs.invoke(on, "getThreadInfo", params, sigs);
  60 
  61         if (result[0] != null) {
  62             throw new RuntimeException("TEST FAILED: " +
  63                 "Expected to have a null element via MBeanServer");
  64         }
  65 
  66         // call getThreadInfo through proxy
  67         ThreadMXBean proxy = newPlatformMXBeanProxy(mbs,
  68                                  on.toString(),
  69                                  ThreadMXBean.class);
  70         tinfos = proxy.getThreadInfo(ids);
  71         if (tinfos[0] != null) {
  72             throw new RuntimeException("TEST FAILED: " +
  73                 "Expected to have a null element");
  74         }
  75         System.out.println("Test passed");
  76     }
  77 }