FULL PRODUCT VERSION :
>java -version
java version "1.4.2_02"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.4.2_02-b03)
Java HotSpot(TM) Client VM (build 1.4.2_02-b03, mixed mode)

also on 1.5
>/usr/java/jdk1.5.0_03/bin/java -version
java version "1.5.0_03"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.5.0_03-b07)
Java HotSpot(TM) Server VM (build 1.5.0_03-b07, mixed mode)


ADDITIONAL OS VERSION INFORMATION :
>uname -a
Linux hutch 2.4.20-6-sleuth9-p4-smp #2 SMP Tue Apr 20 12:26:23 PDT 2004 i686 athlon i386 GNU/Linux


EXTRA RELEVANT SYSTEM CONFIGURATION :
 >fluxbox -version
Fluxbox 0.1.14 : (c) 2001-2002 Henrik Kinnunen

> X -version

XFree86 Version 4.3.0 (Red Hat Linux release: 4.3.0-2)
  Release Date: 27 February 2003
X Protocol Version 11, Revision 0, Release 6.6
Build Operating System: Linux 2.4.20-3bigmem i686 [ELF]
Build Date: 27 February 2003
Build Host: porky.devel.redhat.com

        Before reporting problems, check http://www.XFree86.Org/
        to make sure that you have the latest version.
Module Loader present
OS Kernel: Linux version 2.4.20-6-sleuth9-p4-smp (jphillip@jib) (gcc version 3.2.2 20030222 (Red Hat Linux 3.2.2-5)) #2 SMP Tue Apr 20 12:26:23 PDT 2004


A DESCRIPTION OF THE PROBLEM :
Java 1.5 and 1.4.2 on Linux 2.4 with fluxbox as the window manager: windows are placed at the wrong location and windows move when pack() is called.
If the method setResizable(false) is used, the initial placement of the window is incorrect on the Y-axis. During a gui update when pack() is called the window moves up the y axis by 22 pixels.
If setResizable(false) is not used the initial window placement is still incorrect for the Y axis, but closer to the specified position. During a gui update the window behaves properly.


STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
Compile the included source and run it.
A window will appear with a button. Clicking the button refreshes the display, the window will move when the button is clicked.

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
For the window to be placed in the correct initial position, and the window to remain in that position after calling pack().
ACTUAL -
The window was not in the correct initial position, and after calling pack the window moves up 22 pixels.

REPRODUCIBILITY :
This bug can be reproduced always.

---------- BEGIN SOURCE ----------
import java.awt.Point;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JFrame;

import javax.swing.JButton;

public class BugDemo extends JFrame implements ActionListener
{
    private JButton updateButton;
    private int numUpdates;
    
    public static void main(String[] args)
    {
        BugDemo app = new BugDemo();
    }
    
    public BugDemo()
    {
        initGUI();
    }
    
    private void initGUI()
    {
        setResizable(false);
        setTitle("Test");
        numUpdates = 0;
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        
        updateButton = new JButton();
        updateButton.setText("Update Display");
        updateButton.addActionListener(this);
          
        getContentPane().add(updateButton);
        setLocation(new Point(300,50));
        setVisible(true);
        pack();
        validate();
    }
    
    private void updateDisplay()
    {
        getContentPane().removeAll();
        updateButton.setText(numUpdates+" Updates, Again?");
        getContentPane().add(updateButton);
        pack();
        validate();
    }
    
    public void actionPerformed ( ActionEvent e )
{
        if(e.getSource() == updateButton)
        {
            numUpdates++;
            updateDisplay();
        }
}
}

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

CUSTOMER SUBMITTED WORKAROUND :
A workaround is to not use setResizable(false), or to use setBounds(x,y,xw,yw) and not call pack().
###@###.### 2005-06-21 11:26:12 GMT