1 /*
   2  * Copyright (c) 2013, 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 import java.awt.Graphics;
  26 import java.awt.Toolkit;
  27 import java.awt.image.BufferedImage;
  28 import java.lang.reflect.InvocationTargetException;
  29 
  30 import javax.swing.JButton;
  31 import javax.swing.JFrame;
  32 import javax.swing.SwingUtilities;
  33 
  34 import sun.awt.SunToolkit;
  35 
  36 /**
  37  * @test
  38  * @key headful
  39  * @bug 8009919
  40  * @author Sergey Bylokhov
  41  */
  42 public final class JButtonPaintNPE {
  43 
  44     private static JFrame frame;
  45 
  46     public static void main(final String[] args)
  47             throws InvocationTargetException, InterruptedException {
  48         SwingUtilities.invokeAndWait(() -> {
  49             frame = new JFrame();
  50             frame.add(new JButton() {
  51                 @Override
  52                 protected void paintComponent(final Graphics g) {
  53                     Graphics gg = new BufferedImage(getWidth(), getHeight(),
  54                                   BufferedImage.TYPE_INT_ARGB).createGraphics();
  55                     super.paintComponent(gg);
  56                     gg.dispose();
  57                 }
  58             });
  59             frame.setSize(300, 300);
  60             frame.setLocationRelativeTo(null);
  61             frame.setVisible(true);
  62         });
  63         sleep();
  64         SwingUtilities.invokeAndWait(() -> {
  65             if (frame != null) {
  66                 frame.dispose();
  67             }
  68         });
  69     }
  70 
  71     private static void sleep() {
  72         try {
  73             ((SunToolkit) Toolkit.getDefaultToolkit()).realSync();
  74             Thread.sleep(1000);
  75         } catch (final InterruptedException ignored) {
  76         }
  77     }
  78 }