LoggingDeadlock4.java revision 6073:cea72c2bf071 
1/*
2 * Copyright (c) 2011, 2012, 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/othervm/timeout=15 -Djava.awt.headless=true LoggingDeadlock4
31 */
32
33import java.awt.Container;
34import java.util.concurrent.CountDownLatch;
35import java.util.logging.LogManager;
36import java.util.logging.Logger;
37
38public 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}
112