Java example source code file (StubPeerCrash.java)

This example Java source code file (StubPeerCrash.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

aheavyweightcomponent, awt, awtexception, colormodel, componentpeer, dimension, event, fontmetrics, frame, graphicsconfiguration, image, imageobserver, iterations, point, stubcomponentpeer, volatileimage

The StubPeerCrash.java Java example source code

/*
 * Copyright (c) 2007, 2008, 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.
 */

/*
  @test
  @bug 6255653
  @summary REGRESSION: Override isLightweight() causes access violation in awt.dll
  @author Andrei Dmitriev: area=awt-component
  @run main StubPeerCrash
*/

/*
 * The test may not crash for several times so iteratively continue up to some limit.
 */

import java.awt.*;
import java.awt.peer.*;
import java.awt.event.PaintEvent;
import java.awt.image.ImageProducer;
import java.awt.image.ImageObserver;
import java.awt.image.ColorModel;
import java.awt.image.VolatileImage;
import java.awt.GraphicsConfiguration;
import sun.awt.CausedFocusEvent;
import sun.java2d.pipe.Region;

public class StubPeerCrash {
    public static int ITERATIONS = 20;

    public static void main(String []s)
    {
        for (int i = 0; i < ITERATIONS; i++){
            showFrame(i);
        }
    }

    private static void showFrame(int i){
        System.out.println("iteration = "+i);
        Frame f = new Frame();
        f.add(new AHeavyweightComponent());
        f.setVisible(true);
        f.setVisible(false);
    }
}

class AHeavyweightComponent extends Component {
    private ComponentPeer peer = new StubComponentPeer();

    public AHeavyweightComponent(){
    }

    public boolean isLightweight() {
        return false;
    }

    public ComponentPeer getPeer(){
        return peer;
    }
}

class StubComponentPeer implements ComponentPeer {
    public boolean isObscured(){return true;};
    public boolean canDetermineObscurity(){return true;};
    public void                setVisible(boolean b){};
    public void                setEnabled(boolean b){};
    public void                paint(Graphics g){};
    public void                repaint(long tm, int x, int y, int width, int height){};
    public void                print(Graphics g){};
    public void                setBounds(int x, int y, int width, int height, int op){};
    public void                handleEvent(AWTEvent e){};
    public void                coalescePaintEvent(PaintEvent e){};
    public Point               getLocationOnScreen(){return null;};
    public Dimension           getPreferredSize(){return null;};
    public Dimension           getMinimumSize(){return null;};
    public ColorModel          getColorModel(){return null;};
    public Toolkit             getToolkit(){return null;};
    public Graphics            getGraphics(){return null;};
    public FontMetrics         getFontMetrics(Font font){return null;};
    public void                dispose(){};
    public void                setForeground(Color c){};
    public void                setBackground(Color c){};
    public void                setFont(Font f){};
    public void                updateCursorImmediately(){};
    public boolean             requestFocus(Component lightweightChild,
                                     boolean temporary,
                                     boolean focusedWindowChangeAllowed,
                                     long time, CausedFocusEvent.Cause cause){
        return true;
    };
    public boolean             isFocusable(){return true;};

    public Image               createImage(ImageProducer producer){return null;};
    public Image               createImage(int width, int height){return null;};
    public VolatileImage       createVolatileImage(int width, int height){return null;};
    public boolean             prepareImage(Image img, int w, int h, ImageObserver o){return true;};
    public int                 checkImage(Image img, int w, int h, ImageObserver o){return 0;};
    public GraphicsConfiguration getGraphicsConfiguration(){return null;};
    public boolean     handlesWheelScrolling(){return true;};
    public void createBuffers(int numBuffers, BufferCapabilities caps) throws AWTException{};
    public Image getBackBuffer(){return null;};
    public void flip(int x1, int y1, int x2, int y2, BufferCapabilities.FlipContents flipAction){};
    public void destroyBuffers(){};

    /**
     * Reparents this peer to the new parent referenced by <code>newContainer peer
     * Implementation depends on toolkit and container.
     * @param newContainer peer of the new parent container
     * @since 1.5
     */
    public void reparent(ContainerPeer newContainer){};
    /**
     * Returns whether this peer supports reparenting to another parent withour destroying the peer
     * @return true if appropriate reparent is supported, false otherwise
     * @since 1.5
     */
    public boolean isReparentSupported(){return true;};

    /**
     * Used by lightweight implementations to tell a ComponentPeer to layout
     * its sub-elements.  For instance, a lightweight Checkbox needs to layout
     * the box, as well as the text label.
     */
    public void        layout(){};


     public    Rectangle getBounds(){return null;};

    /**
     * Applies the shape to the native component window.
     * @since 1.7
     */
    public void applyShape(Region shape){};

    /**
     * DEPRECATED:  Replaced by getPreferredSize().
     */
    public Dimension           preferredSize(){return null;};

    /**
     * DEPRECATED:  Replaced by getMinimumSize().
     */
    public Dimension           minimumSize(){return null;};

    /**
     * DEPRECATED:  Replaced by setVisible(boolean).
     */
    public void                show(){};

    /**
     * DEPRECATED:  Replaced by setVisible(boolean).
     */
    public void                hide(){};

    /**
     * DEPRECATED:  Replaced by setEnabled(boolean).
     */
    public void                enable(){};

    /**
     * DEPRECATED:  Replaced by setEnabled(boolean).
     */
    public void                disable(){};

    /**
     * DEPRECATED:  Replaced by setBounds(int, int, int, int).
     */
    public void                reshape(int x, int y, int width, int height){};
}