Name: jk109818 Date: 09/17/2003


FULL PRODUCT VERSION :
java version "1.4.1_02"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.4.1_02-b06)
Java HotSpot(TM) Client VM (build 1.4.1_02-b06, mixed mode)

java version "1.4.0_01"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.4.0_01-b03)
Java HotSpot(TM) Client VM (build 1.4.0_01-b03, mixed mode)

java version "1.3.1_07"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.3.1_07-b02)
Java HotSpot(TM) Client VM (build 1.3.1_07-b02, mixed mode)


FULL OS VERSION :
Linux indigo 2.4.20-8 #1 Thu Mar 13 17:54:28 EST 2003 i686 i686 i386 GNU/Linux


A DESCRIPTION OF THE PROBLEM :
Boxes seem to have some repaint problems when there's not a "heavy" (descended from JComponent) Swing component behind them. On Linux in the 1.4.x series, a Box as content pane fails to paint its background, resulting in random noise artifacts in the final rendering. I have also observed a similar bug (which I'm in the process of pursueing) where a Box as the target of a ScrollPane gets painted solid white (instead of striped) when running on Mac OS X.

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
Seems to have been broken in the transition from 1.3.x to 1.4.x, as it works with 1.3.1_07 but not with 1.4.0_01 and later.

Run the code below on a Linux box. Play with resizing the frame to see that the background on the right-hand side is never repainted.


REPRODUCIBILITY :
This bug can be reproduced always.

---------- BEGIN SOURCE ----------
import java.awt.*;
import javax.swing.*;
/**
* <code>BoxVsPanel</code> demonstrates a Box-rendering
* bug on Java 1.4.1.
*
* <p>Copyright (C) 2003 by Ian W. Davis. All rights reserved.
* <br>Begun on Tue Jun 10 08:51:17 EDT 2003
*/
public class BoxVsPanel //extends ... implements ...
{
    public void Main()
    {
        JPanel panel = new JPanel(new GridLayout(0,1));
        Box box = Box.createVerticalBox();
        
        fillContainer(panel);
        fillContainer(box);
        
        Box cp = Box.createHorizontalBox();
        cp.add(panel);
        cp.add(box);
        
        JFrame frame = new JFrame("BoxVsPanel2");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setContentPane(cp);
        frame.pack();
        frame.setSize(frame.getWidth()+100, frame.getHeight()+100);
        frame.setVisible(true);
    }
    
    void fillContainer(Container c)
    {
        c.add(new JCheckBox("[Dum dum dum] A loooong time ago in a"));
        c.add(new JCheckBox("galaxy"));
        c.add(new JCheckBox("far, far away..."));
    }

    public static void main(String[] args)
    {
        BoxVsPanel mainprog = new BoxVsPanel();
        mainprog.Main();
    }
}//class

---------- END SOURCE ----------

CUSTOMER SUBMITTED WORKAROUND :
Boxes can be wrapped in JPanels to provide a solid background behind them.

Release Regression From : 1.3.1_07
The above release value was the last known release where this
bug was known to work. Since then there has been a regression.

(Incident Review ID: 187522)
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