1 /* 2 * Copyright (c) 2007, 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 * This test is relatively useful for verifying 6379235, but 26 * is too resource intensive, especially on 64 bit systems, 27 * to be run automatically, see 6721694. 28 * 29 * When run it should be typically be run with the server vm 30 * and a relatively small java heap, and a large stack size 31 * ( to provoke the OOM quicker ). 32 * java -server -Xmx32m -Xms32m -Xss256m StartOOMTest 33 */ 34 35 import java.util.*; 36 37 public class StartOOMTest 38 { 39 public static void main(String[] args) throws Throwable { 40 Runnable r = new SleepRunnable(); 41 ThreadGroup tg = new ThreadGroup("buggy"); 42 List<Thread> threads = new ArrayList<Thread>(); 43 Thread failedThread; 44 int i = 0; 45 for (i = 0; ; i++) { 46 Thread t = new Thread(tg, r); 47 try { 48 t.start(); 49 threads.add(t); 50 } catch (Throwable x) { 51 failedThread = t; 52 System.out.println(x); 53 System.out.println(i); 54 break; 55 } 56 } 57 58 int j = 0; 59 for (Thread t : threads) 60 t.interrupt(); 61 62 while (tg.activeCount() > i/2) 63 Thread.yield(); 64 failedThread.start(); 65 failedThread.interrupt(); 66 67 for (Thread t : threads) 68 t.join(); 69 failedThread.join(); 70 71 try { 72 Thread.sleep(1000); 73 } catch (Throwable ignore) { 74 } 75 76 int activeCount = tg.activeCount(); 77 System.out.println("activeCount = " + activeCount); 78 79 if (activeCount > 0) { 80 throw new RuntimeException("Failed: there should be no active Threads in the group"); 81 } 82 } 83 84 static class SleepRunnable implements Runnable 85 { 86 public void run() { 87 try { 88 Thread.sleep(60*1000); 89 } catch (Throwable t) { 90 } 91 } 92 } 93 }