/*

 * Copyright (c) 2008, 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) {}

                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();

        }

    }

}