1 /*
   2  * Copyright (c) 2018, 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.Button;
  25 import java.awt.Frame;
  26 import java.util.concurrent.TimeUnit;
  27 
  28 import sun.awt.SunToolkit;
  29 
  30 /**
  31  * @test
  32  * @key headful
  33  * @bug 8211435
  34  * @modules java.desktop/sun.awt
  35  */
  36 public final class NullActiveWindowOnFocusLost {
  37 
  38     private static volatile long endtime;
  39     private static Throwable failed;
  40 
  41     public static void main(final String[] args) throws Exception {
  42         // Will run the test no more than 30 seconds
  43         endtime = System.nanoTime() + TimeUnit.SECONDS.toNanos(30);
  44         Thread.setDefaultUncaughtExceptionHandler((t, e) -> failed = e);
  45 
  46         final Thread[] threads = new Thread[20];
  47         for (int i = 0; i < threads.length; i++) {
  48             threads[i] = testThread(i);
  49         }
  50         for (final Thread thread : threads) {
  51             thread.start();
  52         }
  53         for (final Thread thread : threads) {
  54             thread.join();
  55         }
  56         if (failed != null) {
  57             failed.printStackTrace();
  58             throw new RuntimeException(failed);
  59         }
  60     }
  61 
  62     private static Thread testThread(int index) {
  63         return new Thread(new ThreadGroup("TG " + index), () -> {
  64             SunToolkit.createNewAppContext();
  65             while (!isComplete()) {
  66                 final Frame frame = new Frame();
  67                 frame.setSize(300, 300);
  68                 frame.add(new Button("Button"));
  69                 frame.setLocationRelativeTo(null);
  70                 frame.setVisible(true);
  71                 try {
  72                     Thread.sleep(index); // increase probability of the failure
  73                 } catch (InterruptedException ignored) {
  74                 }
  75                 frame.dispose();
  76             }
  77         });
  78     }
  79 
  80     private static boolean isComplete() {
  81         return endtime - System.nanoTime() < 0 || failed != null;
  82     }
  83 }