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/*
* Copyright (c) 2011, 2016, 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 6977677 8004928
* @summary Deadlock between LogManager.<clinit> and Logger.getLogger()
* @author Daniel D. Daugherty
* @modules java.base/sun.util.logging
* java.logging
* @compile -XDignore.symbol.file LoggingDeadlock4.java
* @run main/othervm/timeout=15 LoggingDeadlock4
*/
import java.util.concurrent.CountDownLatch;
import java.util.logging.LogManager;
import java.util.logging.Logger;
public class LoggingDeadlock4 {
private static CountDownLatch barrier = new CountDownLatch(1);
private static CountDownLatch lmIsRunning = new CountDownLatch(1);
private static CountDownLatch logIsRunning = new CountDownLatch(1);
// Create a sun.util.logging.PlatformLogger$JavaLogger object
// that has to be redirected when the LogManager class
// is initialized. This can cause a deadlock between
// LogManager.<clinit> and Logger.getLogger().
private static final sun.util.logging.PlatformLogger log =
sun.util.logging.PlatformLogger.getLogger("java.util.logging");
public static void main(String[] args) {
System.out.println("main: LoggingDeadlock4 is starting.");
Thread lmThread = new Thread("LogManagerThread") {
public void run() {
// let main know LogManagerThread is running
lmIsRunning.countDown();
System.out.println(Thread.currentThread().getName()
+ ": is running.");
try {
barrier.await(); // wait for race to start
} catch (InterruptedException e) {
}
LogManager.getLogManager();
}
};
lmThread.start();
Thread logThread = new Thread("LoggerThread") {
public void run() {
// let main know LoggerThread is running
logIsRunning.countDown();
System.out.println(Thread.currentThread().getName()
+ ": is running.");
try {
barrier.await(); // wait for race to start
} catch (InterruptedException e) {
}
Logger.getLogger("foo logger");
}
};
logThread.start();
try {
// wait for LogManagerThread and LoggerThread to get going
lmIsRunning.await();
logIsRunning.await();
} catch (InterruptedException e) {
}
barrier.countDown(); // start the race
try {
lmThread.join();
logThread.join();
} catch (InterruptedException ie) {
}
System.out.println("main: LoggingDeadlock4 is done.");
}
}
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