FULL PRODUCT VERSION :
java version "1.5.0"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.5.0-b64)
Java HotSpot(TM) Client VM (build 1.5.0-b64, mixed mode, sharing)

ADDITIONAL OS VERSION INFORMATION :
Linux dhcppc3 2.6.3-7mdk #1 Wed Mar 17 15:56:42 CET 2004 i686 unknown unknown GNU/Linux

A DESCRIPTION OF THE PROBLEM :
When I use setValue on a JProgressBar, the value the progressbar doesn't update until the new value is at least 1 percent bigger than the old one. This causes the progressbar to move very abruptly on slow processes.

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
// ProgressBarExample.java
// A demonstration of the JProgressBar component. The component tracks the
// progress of a for loop.
//
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

public class ProgressBarExample extends JPanel {

  JProgressBar pbar;
  static final int MY_MINIMUM=0;
  static final int MY_MAXIMUM=1000;

  public ProgressBarExample() {
     pbar = new JProgressBar();
     pbar.setMinimum(MY_MINIMUM);
     pbar.setMaximum(MY_MAXIMUM);
     add(pbar);
  }

  public void updateBar(int newValue) {
    pbar.setValue(newValue);
  }

  public static void main(String args[]) {

     final ProgressBarExample it = new ProgressBarExample();

     JFrame frame = new JFrame("Progress Bar Example");
     frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
     frame.setContentPane(it);
     frame.pack();
     frame.setVisible(true);

     for (int i = MY_MINIMUM; i <= MY_MAXIMUM; i++) {
       final int percent=i;
       try {
         SwingUtilities.invokeLater(new Runnable() {
             public void run() {
               it.updateBar(percent);
             }
         });
         java.lang.Thread.sleep(100);
       } catch (InterruptedException e) {;}
     }
  }
}

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
The progress bar should update every 1 step.
ACTUAL -
The progressbar only updates every 10 step.

REPRODUCIBILITY :
This bug can be reproduced always.
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