JButtonPaintNPE.java

/*
 * Copyright (c) 2013, 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
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 * questions.
 */


import java.awt.Graphics;
import java.awt.Toolkit;
import java.awt.image.BufferedImage;
import java.lang.reflect.InvocationTargetException;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.SwingUtilities;

/**
 * @test
 * @key headful
 * @bug 8009919
 * @author Sergey Bylokhov
 * @library ../../../../lib/testlibrary/
 * @build ExtendedRobot
 * @run main JButtonPaintNPE
 */
public final class JButtonPaintNPE {

    private static JFrame frame;

    public static void main(final String[] args)
            throws InvocationTargetException, InterruptedException {
        SwingUtilities.invokeAndWait(() -> {
            frame = new JFrame();
            frame.add(new JButton() {
                @Override
                protected void paintComponent(final Graphics g) {
                    Graphics gg = new BufferedImage(getWidth(), getHeight(),
                                  BufferedImage.TYPE_INT_ARGB).createGraphics();
                    super.paintComponent(gg);
                    gg.dispose();
                }
            });
            frame.setSize(300, 300);
            frame.setLocationRelativeTo(null);
            frame.setVisible(true);
        });
        sleep();
        SwingUtilities.invokeAndWait(() -> {
            if (frame != null) {
                frame.dispose();
            }
        });
    }

    private static void sleep() {
        try {
             ExtendedRobot robot = new ExtendedRobot();
             robot.waitForIdle(1000);
         }catch(Exception ex) {
             ex.printStackTrace();
             throw new Error("Unexpected Failure");
         }
    }
}