1 /* 2 * Copyright (c) 2011, 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 /* @test 25 * @bug 7068328 26 * @summary Test if getObjectName handles properly when called by 27 * multiple threads simultaneously. Run in othervm mode to 28 * make sure the object name is not initialized to begin with. 29 * @run main/othervm GetObjectName 30 */ 31 32 import java.lang.management.BufferPoolMXBean; 33 import java.lang.management.ManagementFactory; 34 import java.lang.management.PlatformLoggingMXBean; 35 import java.lang.management.PlatformManagedObject; 36 import java.util.ArrayList; 37 import java.util.List; 38 import java.util.concurrent.ExecutorService; 39 import java.util.concurrent.Executors; 40 import java.util.concurrent.LinkedBlockingQueue; 41 import java.util.concurrent.TimeUnit; 42 43 public class GetObjectName { 44 private static boolean failed = false; 45 public static void main(String[] args) throws Exception { 46 int tasks = 10000; 47 ExecutorService executor = Executors.newFixedThreadPool(10); 48 submitTasks(executor, tasks); 49 executor.shutdown(); 50 executor.awaitTermination(10, TimeUnit.SECONDS); 51 if (!failed) { 52 System.out.println("Test passed."); 53 } 54 } 55 56 static void submitTasks(ExecutorService executor, int count) { 57 for (int i=0; i < count && !failed; i++) { 58 executor.execute(new Runnable() { 59 @Override 60 public void run() { 61 List<PlatformManagedObject> mbeans = new ArrayList<>(); 62 mbeans.add(ManagementFactory.getPlatformMXBean(PlatformLoggingMXBean.class)); 63 mbeans.addAll(ManagementFactory.getPlatformMXBeans(BufferPoolMXBean.class)); 64 for (PlatformManagedObject pmo : mbeans) { 65 // Name should not be null 66 if (pmo.getObjectName() == null) { 67 failed = true; 68 throw new RuntimeException("TEST FAILED: getObjectName() returns null"); 69 } 70 } 71 } 72 }); 73 } 74 } 75 }