| /* |
| * Copyright (c) 2005, 2015, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| /* |
| * @test |
| * @bug 6305746 |
| * @key randomness |
| * @summary Test that the null values returned by the ThreadMXBean work. |
| * @author Eamonn McManus |
| * |
| * @run clean ThreadMXBeanTest |
| * @run build ThreadMXBeanTest |
| * @run main ThreadMXBeanTest |
| */ |
| |
| import java.lang.management.*; |
| import java.util.*; |
| import javax.management.*; |
| |
| public class ThreadMXBeanTest { |
| public static void main(String[] args) throws Exception { |
| MBeanServer mbs = MBeanServerFactory.newMBeanServer(); |
| ThreadMXBean tmb = ManagementFactory.getThreadMXBean(); |
| StandardMBean smb = new StandardMBean(tmb, ThreadMXBean.class, true); |
| ObjectName on = new ObjectName("a:type=ThreadMXBean"); |
| mbs.registerMBean(smb, on); |
| ThreadMXBean proxy = JMX.newMXBeanProxy(mbs, on, ThreadMXBean.class); |
| long[] ids1 = proxy.getAllThreadIds(); |
| |
| // Add some random ids to the list so we'll get back null ThreadInfo |
| long[] ids2 = new long[ids1.length + 10]; |
| System.arraycopy(ids1, 0, ids2, 0, ids1.length); |
| Random r = new Random(); |
| for (int i = ids1.length; i < ids2.length; i++) |
| ids2[i] = Math.abs(r.nextLong()); |
| // Following line produces an exception if null values not handled |
| ThreadInfo[] info = proxy.getThreadInfo(ids2); |
| boolean sawNull = false; |
| for (ThreadInfo ti : info) { |
| if (ti == null) |
| sawNull = true; |
| } |
| if (!sawNull) |
| throw new Exception("No null value in returned array"); |
| System.out.println("TEST PASSED"); |
| } |
| } |