Quelle StartOOMTest.java Sprache: JAVA

/*
* Copyright (c) 2007, 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.
*/

/*
* This test is relatively useful for verifying 6379235, but
* is too resource intensive, especially on 64 bit systems,
* to be run automatically, see 6721694.
*
* When run it should be typically be run with the server vm
* and a relatively small java heap, and a large stack size
* ( to provoke the OOM quicker ).
*    java -server -Xmx32m -Xms32m -Xss256m StartOOMTest
*/

import java.util.*;

public class StartOOMTest
{
    public static void main(String[] args) throws Throwable {
        Runnable r = new SleepRunnable();
        ThreadGroup tg = new ThreadGroup("buggy");
        List<Thread> threads = new ArrayList<Thread>();
        Thread failedThread;
        int i = 0;
        for (i = 0; ; i++) {
            Thread t = new Thread(tg, r);
            try {
                t.start();
                threads.add(t);
            } catch (Throwable x) {
                failedThread = t;
                System.out.println(x);
                System.out.println(i);
                break;
            }
        }

        int j = 0;
        for (Thread t : threads)
            t.interrupt();

        while (tg.activeCount() > i/2)
            Thread.yield();
        failedThread.start();
        failedThread.interrupt();

        for (Thread t : threads)
            t.join();
        failedThread.join();

        try {
            Thread.sleep(1000);
        } catch (Throwable ignore) {
        }

        int activeCount = tg.activeCount();
        System.out.println("activeCount = " + activeCount);

        if (activeCount > 0) {
            throw new RuntimeException("Failed: there should be no active Threads in the group");
        }
    }

    static class SleepRunnable implements Runnable
    {
        public void run() {
            try {
                Thread.sleep(60*1000);
            } catch (Throwable t) {
            }
        }
    }
}

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