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 33 import java.util.concurrent.CountDownLatch; 34 import java.util.logging.LogManager; 35 import java.util.logging.Logger; 36 37 public class LoggingDeadlock4 { 38 private static CountDownLatch barrier = new CountDownLatch(1); 39 private static CountDownLatch lmIsRunning = new CountDownLatch(1); 40 private static CountDownLatch logIsRunning = new CountDownLatch(1); 41 42 public static void main(String[] args) { 43 System.out.println("main: LoggingDeadlock4 is starting."); 44 45 // Loading the java.awt.Container class will create a 46 // sun.util.logging.PlatformLogger$JavaLogger object 47 // that has to be redirected when the LogManager class 48 // is initialized. This can cause a deadlock between 49 // LogManager.<clinit> and Logger.getLogger(). 50 try { 51 Class.forName("java.awt.Container"); 52 } catch (ClassNotFoundException cnfe) { 53 throw new RuntimeException("Test failed: could not load" 54 + " java.awt.Container." + cnfe); 55 } 56 57 Thread lmThread = new Thread("LogManagerThread") { 58 public void run() { 59 // let main know LogManagerThread is running 60 lmIsRunning.countDown(); 61 62 System.out.println(Thread.currentThread().getName() 63 + ": is running."); 64 65 try { 66 barrier.await(); // wait for race to start 67 } catch (InterruptedException e) { 68 } 69 70 LogManager.getLogManager(); 71 } 72 }; 73 lmThread.start(); 74 75 Thread logThread = new Thread("LoggerThread") { 76 public void run() { 77 // let main know LoggerThread is running 78 logIsRunning.countDown(); 79 80 System.out.println(Thread.currentThread().getName() 81 + ": is running."); 82 83 try { 84 barrier.await(); // wait for race to start 85 } catch (InterruptedException e) { 86 } 87 88 Logger.getLogger("foo logger"); 89 } 90 }; 91 logThread.start(); 92 93 try { 94 // wait for LogManagerThread and LoggerThread to get going 95 lmIsRunning.await(); 96 logIsRunning.await(); 97 } catch (InterruptedException e) { 98 } 99 100 barrier.countDown(); // start the race 101 102 try { 103 lmThread.join(); 104 logThread.join(); 105 } catch (InterruptedException ie) { 106 } 107 108 System.out.println("main: LoggingDeadlock4 is done."); 109 } 110 }