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 * @modules jdk.jdi 30 * @run build TestScaffold VMConnection TargetListener TargetAdapter 31 * @run driver NullThreadGroupNameTest 32 */ 33 import com.sun.jdi.*; 34 import com.sun.jdi.connect.*; 35 import com.sun.jdi.event.*; 36 import com.sun.jdi.request.*; 37 import com.sun.jdi.VMDisconnectedException; 38 import java.util.concurrent.CountDownLatch; 39 import java.util.*; 40 41 class DebugTarget { 42 public final static String DEBUG_THREAD_NAME = "DebugThread"; 43 44 public static void main(String[] args) throws Exception { 45 DebugThread thread = new DebugThread(); 46 thread.start(); 47 thread.runningLatch.await(); 48 breakpointHere(); 49 thread.breakpointLatch.countDown(); 50 } 51 52 public static void breakpointHere() { 53 System.out.println("Breakpoint finished!"); 54 } 55 56 static class DebugThread extends Thread { 57 final CountDownLatch runningLatch = new CountDownLatch(1); 58 final CountDownLatch breakpointLatch = new CountDownLatch(1); 59 60 public DebugThread() { 61 super(new ThreadGroup(null), DEBUG_THREAD_NAME); 62 } 63 64 public void run() { 65 runningLatch.countDown(); 66 try { 67 breakpointLatch.await(); 68 } catch (InterruptedException ie) { 69 ie.printStackTrace(); 70 } 71 } 72 } 73 } 74 75 public class NullThreadGroupNameTest extends TestScaffold { 76 77 NullThreadGroupNameTest(String args[]) { 78 super(args); 79 } 80 81 public static void main(String[] args) throws Exception { 82 new NullThreadGroupNameTest(args).startTests(); 83 } 84 85 protected void runTests() throws Exception { 86 startTo("DebugTarget", "breakpointHere", "()V"); 87 88 ThreadReference thread = findThread(DebugTarget.DEBUG_THREAD_NAME); 89 assertThreadGroupName(thread.threadGroup(), ""); 90 91 listenUntilVMDisconnect(); 92 } 93 94 private ThreadReference findThread(String name) { 95 for (ThreadReference thread : vm().allThreads()) { 96 if (name.equals(thread.name())) { 97 return thread; 98 } 99 } 100 throw new NoSuchElementException("Couldn't find " + name); 101 } 102 103 private void assertThreadGroupName(ThreadGroupReference threadGroup, String expectedName) { 104 try { 105 String name = threadGroup.name(); 106 if (!expectedName.equals(name)) { 107 throw new AssertionError("Unexpected thread group name '" + name + "'"); 108 } 109 } catch (VMDisconnectedException vmde) { 110 throw new AssertionError("Likely JVM crash with null thread group name", vmde); 111 } 112 } 113 }