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/*
* Copyright (c) 2013, 2015, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
/**
* @test
* @bug 7105883
* @summary Ensure that JDWP doesn't crash with a null thread group name
*
* @run build TestScaffold VMConnection TargetListener TargetAdapter
* @run driver NullThreadGroupNameTest
*/
import com.sun.jdi.*;
import com.sun.jdi.connect.*;
import com.sun.jdi.event.*;
import com.sun.jdi.request.*;
import com.sun.jdi.VMDisconnectedException;
import java.util.concurrent.CountDownLatch;
import java.util.*;
class DebugTarget {
public final static String DEBUG_THREAD_NAME = "DebugThread";
public static void main(String[] args) throws Exception {
DebugThread thread = new DebugThread();
thread.start();
thread.runningLatch.await();
breakpointHere();
thread.breakpointLatch.countDown();
}
public static void breakpointHere() {
System.out.println("Breakpoint finished!");
}
static class DebugThread extends Thread {
final CountDownLatch runningLatch = new CountDownLatch(1);
final CountDownLatch breakpointLatch = new CountDownLatch(1);
public DebugThread() {
super(new ThreadGroup(null), DEBUG_THREAD_NAME);
}
public void run() {
runningLatch.countDown();
try {
breakpointLatch.await();
} catch (InterruptedException ie) {
ie.printStackTrace();
}
}
}
}
public class NullThreadGroupNameTest extends TestScaffold {
NullThreadGroupNameTest(String args[]) {
super(args);
}
public static void main(String[] args) throws Exception {
new NullThreadGroupNameTest(args).startTests();
}
protected void runTests() throws Exception {
startTo("DebugTarget", "breakpointHere", "()V");
ThreadReference thread = findThread(DebugTarget.DEBUG_THREAD_NAME);
assertThreadGroupName(thread.threadGroup(), "");
listenUntilVMDisconnect();
}
private ThreadReference findThread(String name) {
for (ThreadReference thread : vm().allThreads()) {
if (name.equals(thread.name())) {
return thread;
}
}
throw new NoSuchElementException("Couldn't find " + name);
}
private void assertThreadGroupName(ThreadGroupReference threadGroup, String expectedName) {
try {
String name = threadGroup.name();
if (!expectedName.equals(name)) {
throw new AssertionError("Unexpected thread group name '" + name + "'");
}
} catch (VMDisconnectedException vmde) {
throw new AssertionError("Likely JVM crash with null thread group name", vmde);
}
}
}
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