1 /*

     2  * Copyright (c) 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     6977677

    27  * @summary Deadlock between LogManager.<clinit> and Logger.getLogger()

    28  * @author  Daniel D. Daugherty

    29  * @build LoggingDeadlock4

    30  * @run main/timeout=15 LoggingDeadlock4

    31  */

    32 

    33 import java.awt.Container;

    34 import java.util.concurrent.CountDownLatch;

    35 import java.util.logging.LogManager;

    36 import java.util.logging.Logger;

    37 

    38 public class LoggingDeadlock4 {

    39     private static CountDownLatch barrier      = new CountDownLatch(1);

    40     private static CountDownLatch lmIsRunning  = new CountDownLatch(1);

    41     private static CountDownLatch logIsRunning = new CountDownLatch(1);

    42 

    43     public static void main(String[] args) {

    44         System.out.println("main: LoggingDeadlock4 is starting.");

    45 

    46         // Loading the java.awt.Container class will create a

    47         // sun.util.logging.PlatformLogger$JavaLogger object

    48         // that has to be redirected when the LogManager class

    49         // is initialized. This can cause a deadlock between

    50         // LogManager.<clinit> and Logger.getLogger().

    51         try {

    52             Class.forName("java.awt.Container");

    53         } catch (ClassNotFoundException cnfe) {

    54             throw new RuntimeException("Test failed: could not load"

    55                 + " java.awt.Container." + cnfe);

    56         }

    57 

    58         Thread lmThread = new Thread("LogManagerThread") {

    59             public void run() {

    60                 // let main know LogManagerThread is running

    61                 lmIsRunning.countDown();

    62 

    63                 System.out.println(Thread.currentThread().getName()

    64                     + ": is running.");

    65 

    66                 try {

    67                     barrier.await();  // wait for race to start

    68                 } catch (InterruptedException e) {

    69                 }

    70 

    71                 LogManager manager = LogManager.getLogManager();

    72             }

    73         };

    74         lmThread.start();

    75 

    76         Thread logThread = new Thread("LoggerThread") {

    77             public void run() {

    78                 // let main know LoggerThread is running

    79                 logIsRunning.countDown();

    80 

    81                 System.out.println(Thread.currentThread().getName()

    82                     + ": is running.");

    83 

    84                 try {

    85                     barrier.await();  // wait for race to start

    86                 } catch (InterruptedException e) {

    87                 }

    88 

    89                 Logger foo = Logger.getLogger("foo logger");

    90             }

    91         };

    92         logThread.start();

    93 

    94         try {

    95             // wait for LogManagerThread and LoggerThread to get going

    96             lmIsRunning.await();

    97             logIsRunning.await();

    98         } catch (InterruptedException e) {

    99         }

   100 

   101         barrier.countDown();  // start the race

   102 

   103         try {

   104             lmThread.join();

   105             logThread.join();

   106         } catch (InterruptedException ie) {

   107         }

   108 

   109         System.out.println("main: LoggingDeadlock4 is done.");

   110     }

   111 }