--- /dev/null 2019-12-09 21:24:25.000000000 -0800 +++ new/test/jdk/java/awt/Frame/GetGraphicsStressTest/GetGraphicsStressTest.java 2019-12-09 21:24:24.000000000 -0800 @@ -0,0 +1,106 @@ +/* + * Copyright (c) 2019, Oracle and/or its affiliates. All rights reserved. + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. + * + * This code is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License version 2 only, as + * published by the Free Software Foundation. + * + * This code is distributed in the hope that it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License + * version 2 for more details (a copy is included in the LICENSE file that + * accompanied this code). + * + * You should have received a copy of the GNU General Public License version + * 2 along with this work; if not, write to the Free Software Foundation, + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. + * + * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA + * or visit www.oracle.com if you need additional information or have any + * questions. + */ + +import java.awt.Frame; +import java.awt.Graphics; +import java.util.concurrent.TimeUnit; + +/** + * @test + * @bug 8235638 + * @key headful + */ +public final class GetGraphicsStressTest { + + static volatile Throwable failed; + static volatile long endtime; + + public static void main(final String[] args) throws Exception { + // Catch all uncaught exceptions and treat them as test failure + Thread.setDefaultUncaughtExceptionHandler((t, e) -> failed = e); + + // Will run the test no more than 20 seconds + for (int i = 0; i < 4; i++) { + endtime = System.nanoTime() + TimeUnit.SECONDS.toNanos(5); + test(); + } + } + + private static void test() throws Exception { + Frame f = new Frame(); + f.setSize(100, 100); + f.setLocationRelativeTo(null); + f.setVisible(true); + + Thread thread1 = new Thread(() -> { + while (!isComplete()) { + f.removeNotify(); + f.addNotify(); + } + }); + Thread thread2 = new Thread(() -> { + while (!isComplete()) { + Graphics g = f.getGraphics(); + if (g != null) { + g.dispose(); + } + } + }); + Thread thread3 = new Thread(() -> { + while (!isComplete()) { + Graphics g = f.getGraphics(); + if (g != null) { + g.dispose(); + } + } + }); + Thread thread4 = new Thread(() -> { + while (!isComplete()) { + Graphics g = f.getGraphics(); + if (g != null) { + g.drawLine(0, 0, 4, 4); // just in case... + g.dispose(); + } + } + }); + thread1.start(); + thread2.start(); + thread3.start(); + thread4.start(); + thread1.join(); + thread2.join(); + thread3.join(); + thread4.join(); + + f.dispose(); + if (failed != null) { + System.err.println("Test failed"); + failed.printStackTrace(); + throw new RuntimeException(failed); + } + } + + private static boolean isComplete() { + return endtime - System.nanoTime() < 0 || failed != null; + } +}