Name: gm110360 Date: 09/28/2004


FULL PRODUCT VERSION :
java version "1.4.2"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.4.2-b28)
Java HotSpot(TM) Client VM (build 1.4.2-b28, mixed mode)

ADDITIONAL OS VERSION INFORMATION :
Microsoft Windows XP [Version 5.1.2600]

A DESCRIPTION OF THE PROBLEM :
If you add a JScrollPane Y in a JFrame, then add a JScrollPane X in the JScrollPane Y and then add a JPanel Z in the JScrollPane X and set the preferred size of the JPanel to something a little bit smaller then the size of the JScrollPane Y, scroll bars appears and the CPU goes to 100% of usage if you resize the JFrame.

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
-Create a JFrame.
-Set a null layout to the content pane of the JFrame.
-Create a JScrollPane Y and set its bounds.
-Add the JScrollPane Y in the JFrame.
-Add a JScrollPane X in the JScrollPane Y.
-Add a JPanel A in the JScrollPane X.
-Add a JPanel B in the JScrollPane A.
-Set the preferred size of the JPanel B to something a little bit smaller then the size of the JScrollPane Y.
-Show the JFrame. (There should not be any scroll bars).
-Resize the JFrame.

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
Nothing special. Just the JFrame being resize. The JScrollPane should not be affected there should not be scroll bars added.
ACTUAL -
Scroll bars appear and the CPU goes to 100% of usage

REPRODUCIBILITY :
This bug can be reproduced always.

---------- BEGIN SOURCE ----------
import java.awt.*;
import javax.swing.*;

public class TestPlayer {
    public static void main(String args[]) {
        JFrame frame = new JFrame();
        frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
        frame.getContentPane().setLayout(null);
        JScrollPane zone = new JScrollPane();
        zone.setBorder(null);
        zone.setSize(new Dimension(400,400));
        zone.setLocation(20,20);
        JScrollPane player = new JScrollPane();
        player.setBorder(null);
        JPanel background = new JPanel();
        background.setBackground(Color.BLACK);
        JPanel video = new JPanel();
        video.setBackground(Color.BLUE);
        video.setPreferredSize(new Dimension(390,389));
        background.add(video);
        player.setViewportView(background);
        zone.setViewportView(player);
        frame.getContentPane().add(zone);
        frame.setSize(500,500);
        frame.show();
    }
}
---------- END SOURCE ----------
(Incident Review ID: 315572)
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