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/*
* Copyright (c) 2008, 2011, 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 6576763
* @summary (thread) Thread constructors throw undocumented NPE for null name
*/
/*
* Verify that threads constructed with a null thread name do not get added
* to the list of unstarted thread for a thread group. We can do this by
* checking that a daemon threadGroup is desroyed after its final valid thread
* has completed.
*/
import java.util.concurrent.CountDownLatch;
import static java.lang.System.out;
public class NullThreadName
{
static CountDownLatch done = new CountDownLatch(1);
public static void main(String args[]) throws Exception {
ThreadGroup tg = new ThreadGroup("chegar-threads");
Thread goodThread = new Thread(tg, new GoodThread(), "goodThread");
try {
Thread badThread = new Thread(tg, new Runnable(){
@Override
public void run() {} }, null);
} catch (NullPointerException npe) {
out.println("OK, caught expected " + npe);
}
tg.setDaemon(true);
goodThread.start();
done.await();
int count = 0;
while (goodThread.isAlive()) {
/* Hold off a little to allow the thread to complete */
out.println("GoodThread still alive, sleeping...");
try { Thread.sleep(2000); }
catch (InterruptedException unused) {}
/* do not wait forever - allow 120 seconds same as jtreg default timeout. */
if (count++ > 60)
throw new AssertionError("GoodThread is still alive!");
}
if (!tg.isDestroyed()) {
throw new AssertionError("Failed: Thread group is not destroyed.");
}
}
static class GoodThread implements Runnable
{
@Override
public void run() {
out.println("Good Thread started...");
out.println("Good Thread finishing");
done.countDown();
}
}
}
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