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 }