1 /* 2 * Copyright (c) 2019, 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 import java.awt.Frame; 25 import java.awt.Graphics; 26 import java.util.concurrent.TimeUnit; 27 28 /** 29 * @test 30 * @bug 8235638 31 * @key headful 32 */ 33 public final class GetGraphicsStressTest { 34 35 static volatile Throwable failed; 36 static volatile long endtime; 37 38 public static void main(final String[] args) throws Exception { 39 // Catch all uncaught exceptions and treat them as test failure 40 Thread.setDefaultUncaughtExceptionHandler((t, e) -> failed = e); 41 42 // Will run the test no more than 20 seconds 43 for (int i = 0; i < 4; i++) { 44 endtime = System.nanoTime() + TimeUnit.SECONDS.toNanos(5); 45 test(); 46 } 47 } 48 49 private static void test() throws Exception { 50 Frame f = new Frame(); 51 f.setSize(100, 100); 52 f.setLocationRelativeTo(null); 53 f.setVisible(true); 54 55 Thread thread1 = new Thread(() -> { 56 while (!isComplete()) { 57 f.removeNotify(); 58 f.addNotify(); 59 } 60 }); 61 Thread thread2 = new Thread(() -> { 62 while (!isComplete()) { 63 Graphics g = f.getGraphics(); 64 if (g != null) { 65 g.dispose(); 66 } 67 } 68 }); 69 Thread thread3 = new Thread(() -> { 70 while (!isComplete()) { 71 Graphics g = f.getGraphics(); 72 if (g != null) { 73 g.dispose(); 74 } 75 } 76 }); 77 Thread thread4 = new Thread(() -> { 78 while (!isComplete()) { 79 Graphics g = f.getGraphics(); 80 if (g != null) { 81 g.drawLine(0, 0, 4, 4); // just in case... 82 g.dispose(); 83 } 84 } 85 }); 86 thread1.start(); 87 thread2.start(); 88 thread3.start(); 89 thread4.start(); 90 thread1.join(); 91 thread2.join(); 92 thread3.join(); 93 thread4.join(); 94 95 f.dispose(); 96 if (failed != null) { 97 System.err.println("Test failed"); 98 failed.printStackTrace(); 99 throw new RuntimeException(failed); 100 } 101 } 102 103 private static boolean isComplete() { 104 return endtime - System.nanoTime() < 0 || failed != null; 105 } 106 }