1 /* 2 * Copyright (c) 2005, 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 6305746 27 * @key randomness 28 * @summary Test that the null values returned by the ThreadMXBean work. 29 * @author Eamonn McManus 30 * 31 * @run clean ThreadMXBeanTest 32 * @run build ThreadMXBeanTest 33 * @run main ThreadMXBeanTest 34 */ 35 36 import java.lang.management.*; 37 import java.util.*; 38 import javax.management.*; 39 40 public class ThreadMXBeanTest { main(String[] args)41 public static void main(String[] args) throws Exception { 42 MBeanServer mbs = MBeanServerFactory.newMBeanServer(); 43 ThreadMXBean tmb = ManagementFactory.getThreadMXBean(); 44 StandardMBean smb = new StandardMBean(tmb, ThreadMXBean.class, true); 45 ObjectName on = new ObjectName("a:type=ThreadMXBean"); 46 mbs.registerMBean(smb, on); 47 ThreadMXBean proxy = JMX.newMXBeanProxy(mbs, on, ThreadMXBean.class); 48 long[] ids1 = proxy.getAllThreadIds(); 49 50 // Add some random ids to the list so we'll get back null ThreadInfo 51 long[] ids2 = new long[ids1.length + 10]; 52 System.arraycopy(ids1, 0, ids2, 0, ids1.length); 53 Random r = new Random(); 54 for (int i = ids1.length; i < ids2.length; i++) 55 ids2[i] = Math.abs(r.nextLong()); 56 // Following line produces an exception if null values not handled 57 ThreadInfo[] info = proxy.getThreadInfo(ids2); 58 boolean sawNull = false; 59 for (ThreadInfo ti : info) { 60 if (ti == null) 61 sawNull = true; 62 } 63 if (!sawNull) 64 throw new Exception("No null value in returned array"); 65 System.out.println("TEST PASSED"); 66 } 67 } 68