FULL PRODUCT VERSION :
1.4.2_10

ADDITIONAL OS VERSION INFORMATION :
Windows98 Second Editon
Win2000 Professional SP4
WindowsXP Professional/Home SP2

EXTRA RELEVANT SYSTEM CONFIGURATION :
LAN 100Base-T
Platform : Win2000 Professional SP4

A DESCRIPTION OF THE PROBLEM :

The following program run, "CPU 100% usage "  always occurs.
 (JButton with non-transparent GIF Image put JPanel.)
combo_up.gif is "non transparent GIF " Image.

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
The case of  "transparent GIF " Image   "CPU 100% usage " doesn't occur.
 

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
CPU usage of PC doesn't become 100%.
ACTUAL -
CPU usage of PC become 100%.

ERROR MESSAGES/STACK TRACES THAT OCCUR :
No, but action of Java Appliation become slow.


REPRODUCIBILITY :
This bug can be reproduced always.

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


public class test extends Panel{
  ImageIcon imageIcon = new ImageIcon(test.class.getResource("combo_up.gif"));

  public test(){
    this.add(new JButton(imageIcon));
  }

  public static void main(String[] args){
    JFrame test1 = new JFrame("");

    test1.getContentPane().add(new test());
    test1.setSize(100,100);
    test1.setVisible(true);
  }
---------- END SOURCE ----------