86 lines
2.9 KiB
Java
86 lines
2.9 KiB
Java
/*
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* Copyright (c) 2008, 2011, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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/*
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* @test
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* @bug 6576763
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* @summary (thread) Thread constructors throw undocumented NPE for null name
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*/
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/*
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* Verify that threads constructed with a null thread name do not get added
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* to the list of unstarted thread for a thread group. We can do this by
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* checking that a daemon threadGroup is desroyed after its final valid thread
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* has completed.
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*/
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import java.util.concurrent.CountDownLatch;
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import static java.lang.System.out;
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public class NullThreadName
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{
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static CountDownLatch done = new CountDownLatch(1);
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public static void main(String args[]) throws Exception {
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ThreadGroup tg = new ThreadGroup("chegar-threads");
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Thread goodThread = new Thread(tg, new GoodThread(), "goodThread");
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try {
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Thread badThread = new Thread(tg, new Runnable(){
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@Override
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public void run() {} }, null);
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} catch (NullPointerException npe) {
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out.println("OK, caught expected " + npe);
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}
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tg.setDaemon(true);
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goodThread.start();
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done.await();
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int count = 0;
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while (goodThread.isAlive()) {
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/* Hold off a little to allow the thread to complete */
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out.println("GoodThread still alive, sleeping...");
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try { Thread.sleep(2000); }
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catch (InterruptedException unused) {}
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/* do not wait forever - allow 120 seconds same as jtreg default timeout. */
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if (count++ > 60)
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throw new AssertionError("GoodThread is still alive!");
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}
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if (!tg.isDestroyed()) {
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throw new AssertionError("Failed: Thread group is not destroyed.");
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}
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}
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static class GoodThread implements Runnable
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{
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@Override
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public void run() {
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out.println("Good Thread started...");
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out.println("Good Thread finishing");
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done.countDown();
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}
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}
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}
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