1/* 2 * Copyright (c) 2011, 2016, 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 8004928 27 * @summary Deadlock between LogManager.<clinit> and Logger.getLogger() 28 * @author Daniel D. Daugherty 29 * @modules java.base/sun.util.logging 30 * java.logging 31 * @compile -XDignore.symbol.file LoggingDeadlock4.java 32 * @run main/othervm/timeout=15 LoggingDeadlock4 33 */ 34 35import java.util.concurrent.CountDownLatch; 36import java.util.logging.LogManager; 37import java.util.logging.Logger; 38 39public class LoggingDeadlock4 { 40 private static CountDownLatch barrier = new CountDownLatch(1); 41 private static CountDownLatch lmIsRunning = new CountDownLatch(1); 42 private static CountDownLatch logIsRunning = new CountDownLatch(1); 43 44 // Create a sun.util.logging.PlatformLogger$JavaLogger object 45 // that has to be redirected when the LogManager class 46 // is initialized. This can cause a deadlock between 47 // LogManager.<clinit> and Logger.getLogger(). 48 private static final sun.util.logging.PlatformLogger log = 49 sun.util.logging.PlatformLogger.getLogger("java.util.logging"); 50 51 public static void main(String[] args) { 52 System.out.println("main: LoggingDeadlock4 is starting."); 53 54 Thread lmThread = new Thread("LogManagerThread") { 55 public void run() { 56 // let main know LogManagerThread is running 57 lmIsRunning.countDown(); 58 59 System.out.println(Thread.currentThread().getName() 60 + ": is running."); 61 62 try { 63 barrier.await(); // wait for race to start 64 } catch (InterruptedException e) { 65 } 66 67 LogManager.getLogManager(); 68 } 69 }; 70 lmThread.start(); 71 72 Thread logThread = new Thread("LoggerThread") { 73 public void run() { 74 // let main know LoggerThread is running 75 logIsRunning.countDown(); 76 77 System.out.println(Thread.currentThread().getName() 78 + ": is running."); 79 80 try { 81 barrier.await(); // wait for race to start 82 } catch (InterruptedException e) { 83 } 84 85 Logger.getLogger("foo logger"); 86 } 87 }; 88 logThread.start(); 89 90 try { 91 // wait for LogManagerThread and LoggerThread to get going 92 lmIsRunning.await(); 93 logIsRunning.await(); 94 } catch (InterruptedException e) { 95 } 96 97 barrier.countDown(); // start the race 98 99 try { 100 lmThread.join(); 101 logThread.join(); 102 } catch (InterruptedException ie) { 103 } 104 105 System.out.println("main: LoggingDeadlock4 is done."); 106 } 107} 108