1 /* 2 * Copyright (c) 2005, 2008, 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 6305746 27 * @summary Test that the null values returned by the ThreadMXBean work. 28 * @author Eamonn McManus 29 * @run clean ThreadMXBeanTest 30 * @run build ThreadMXBeanTest 31 * @run main ThreadMXBeanTest 32 * @key randomness 33 */ 34 35 import java.lang.management.*; 36 import java.util.*; 37 import javax.management.*; 38 39 public class ThreadMXBeanTest { main(String[] args)40 public static void main(String[] args) throws Exception { 41 MBeanServer mbs = MBeanServerFactory.newMBeanServer(); 42 ThreadMXBean tmb = ManagementFactory.getThreadMXBean(); 43 StandardMBean smb = new StandardMBean(tmb, ThreadMXBean.class, true); 44 ObjectName on = new ObjectName("a:type=ThreadMXBean"); 45 mbs.registerMBean(smb, on); 46 ThreadMXBean proxy = JMX.newMXBeanProxy(mbs, on, ThreadMXBean.class); 47 long[] ids1 = proxy.getAllThreadIds(); 48 49 // Add some random ids to the list so we'll get back null ThreadInfo 50 long[] ids2 = new long[ids1.length + 10]; 51 System.arraycopy(ids1, 0, ids2, 0, ids1.length); 52 Random r = new Random(); 53 for (int i = ids1.length; i < ids2.length; i++) 54 ids2[i] = Math.abs(r.nextLong()); 55 // Following line produces an exception if null values not handled 56 ThreadInfo[] info = proxy.getThreadInfo(ids2); 57 boolean sawNull = false; 58 for (ThreadInfo ti : info) { 59 if (ti == null) 60 sawNull = true; 61 } 62 if (!sawNull) 63 throw new Exception("No null value in returned array"); 64 System.out.println("TEST PASSED"); 65 } 66 } 67