1 /* 2 * Copyright (c) 2013, 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 7105883 27 * @summary Ensure that JDWP doesn't crash with a null thread group name 28 * 29 * @run build TestScaffold VMConnection TargetListener TargetAdapter 30 * @run driver NullThreadGroupNameTest 31 */ 32 import com.sun.jdi.*; 33 import com.sun.jdi.connect.*; 34 import com.sun.jdi.event.*; 35 import com.sun.jdi.request.*; 36 import com.sun.jdi.VMDisconnectedException; 37 import java.util.concurrent.CountDownLatch; 38 import java.util.*; 39 40 class DebugTarget { 41 public final static String DEBUG_THREAD_NAME = "DebugThread"; 42 43 public static void main(String[] args) throws Exception { 44 DebugThread thread = new DebugThread(); 45 thread.start(); 46 thread.runningLatch.await(); 47 breakpointHere(); 48 thread.breakpointLatch.countDown(); 49 } 50 51 public static void breakpointHere() { 52 System.out.println("Breakpoint finished!"); 53 } 54 55 static class DebugThread extends Thread { 56 final CountDownLatch runningLatch = new CountDownLatch(1); 57 final CountDownLatch breakpointLatch = new CountDownLatch(1); 58 59 public DebugThread() { 60 super(new ThreadGroup(null), DEBUG_THREAD_NAME); 61 } 62 63 public void run() { 64 runningLatch.countDown(); 65 try { 66 breakpointLatch.await(); 67 } catch (InterruptedException ie) { 68 ie.printStackTrace(); 69 } 70 } 71 } 72 } 73 74 public class NullThreadGroupNameTest extends TestScaffold { 75 76 NullThreadGroupNameTest(String args[]) { 77 super(args); 78 } 79 80 public static void main(String[] args) throws Exception { 81 new NullThreadGroupNameTest(args).startTests(); 82 } 83 84 protected void runTests() throws Exception { 85 startTo("DebugTarget", "breakpointHere", "()V"); 86 87 ThreadReference thread = findThread(DebugTarget.DEBUG_THREAD_NAME); 88 assertThreadGroupName(thread.threadGroup(), ""); 89 90 listenUntilVMDisconnect(); 91 } 92 93 private ThreadReference findThread(String name) { 94 for (ThreadReference thread : vm().allThreads()) { 95 if (name.equals(thread.name())) { 96 return thread; 97 } 98 } 99 throw new NoSuchElementException("Couldn't find " + name); 100 } 101 102 private void assertThreadGroupName(ThreadGroupReference threadGroup, String expectedName) { 103 try { 104 String name = threadGroup.name(); 105 if (!expectedName.equals(name)) { 106 throw new AssertionError("Unexpected thread group name '" + name + "'"); 107 } 108 } catch (VMDisconnectedException vmde) { 109 throw new AssertionError("Likely JVM crash with null thread group name", vmde); 110 } 111 } 112 }