1/* 2 * Copyright (c) 2008, 2011, 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 6576763 27 * @summary (thread) Thread constructors throw undocumented NPE for null name 28 */ 29 30/* 31 * Verify that threads constructed with a null thread name do not get added 32 * to the list of unstarted thread for a thread group. We can do this by 33 * checking that a daemon threadGroup is desroyed after its final valid thread 34 * has completed. 35 */ 36 37import java.util.concurrent.CountDownLatch; 38import static java.lang.System.out; 39 40public class NullThreadName 41{ 42 static CountDownLatch done = new CountDownLatch(1); 43 44 public static void main(String args[]) throws Exception { 45 ThreadGroup tg = new ThreadGroup("chegar-threads"); 46 Thread goodThread = new Thread(tg, new GoodThread(), "goodThread"); 47 try { 48 Thread badThread = new Thread(tg, new Runnable(){ 49 @Override 50 public void run() {} }, null); 51 } catch (NullPointerException npe) { 52 out.println("OK, caught expected " + npe); 53 } 54 tg.setDaemon(true); 55 goodThread.start(); 56 57 done.await(); 58 59 int count = 0; 60 while (goodThread.isAlive()) { 61 /* Hold off a little to allow the thread to complete */ 62 out.println("GoodThread still alive, sleeping..."); 63 try { Thread.sleep(2000); } 64 catch (InterruptedException unused) {} 65 66 /* do not wait forever - allow 120 seconds same as jtreg default timeout. */ 67 if (count++ > 60) 68 throw new AssertionError("GoodThread is still alive!"); 69 } 70 71 if (!tg.isDestroyed()) { 72 throw new AssertionError("Failed: Thread group is not destroyed."); 73 } 74 } 75 76 static class GoodThread implements Runnable 77 { 78 @Override 79 public void run() { 80 out.println("Good Thread started..."); 81 out.println("Good Thread finishing"); 82 done.countDown(); 83 } 84 } 85} 86