JSplitPane/JMenu/AffineTransform & unexpected shifting drawing on resize

Question

I was able to reproduce my problem with the code snippet below. Whenever I move the divider or resize the window, the line
will jump, if I don't do a translation transform and use absolute positioning - I don't see any jumping. If I use translation and remove the menubar - it works. If I use translation and I remove the split pane - it works. Is this a bug? Or should I do painting differently.
OS: FreeBSD 6.2 x86 using eclipse w/ JDK1.6
Tried this code under JDK1.6 BSD Native and Linux Compatibitlity Mode JDK1.6 - both produce the same problem.
Any advice appreciated,
Monty
package temp;
import java.awt.geom.AffineTransform;
import java.awt.BorderLayout;
import java.awt.Graphics;
import java.awt.Graphics2D;
import javax.swing.SwingUtilities;
import javax.swing.JPanel;
import javax.swing.JFrame;
import javax.swing.JSplitPane;
import java.awt.GridBagLayout;
import javax.swing.JMenuBar;
import javax.swing.JMenu;
public class EntryPoint {
     private JFrame jFrame = null;
     private JPanel jContentPane = null;
     private JSplitPane jSplitPane = null;
     private JPanel jPanel = null;
     private JPanel jPanel1 = null;
     private JMenuBar jJMenuBar = null;
     private JMenu jMenu = null;
     private JFrame getJFrame() {
          if (jFrame == null) {
               jFrame = new JFrame();
               jFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
               jFrame.setSize(300, 200);
               jFrame.setContentPane(getJContentPane());
               jFrame.setJMenuBar(getJJMenuBar());
               jFrame.setTitle("Application");
          return jFrame;
     private JPanel getJContentPane() {
          if (jContentPane == null) {
               jContentPane = new JPanel();
               jContentPane.setLayout(new BorderLayout());
               jContentPane.add(getJSplitPane(), BorderLayout.CENTER);
          return jContentPane;
     private JSplitPane getJSplitPane() {
          if (jSplitPane == null) {
               jSplitPane = new JSplitPane();
               jSplitPane.setDividerLocation(100);
               jSplitPane.setLeftComponent(getJPanel());
               jSplitPane.setRightComponent(getJPanel1());
          return jSplitPane;
     private JPanel getJPanel() {
          if (jPanel == null) {
               jPanel = new JPanel();
               jPanel.setLayout(new GridBagLayout());
          return jPanel;
     private JPanel getJPanel1() {
          if (jPanel1 == null) {
               jPanel1 = new JPanel() {
                    public void paintComponent(Graphics g) {
                         super.paintComponent(g);
                         Graphics2D g2 = (Graphics2D) g;
                         AffineTransform at = new AffineTransform();
                         at.translate(100,100);
                         g2.setTransform(at);
                         g2.drawLine(0,0,100,100);
          return jPanel1;
     private JMenuBar getJJMenuBar() {
          if (jJMenuBar == null) {
               jJMenuBar = new JMenuBar();
               jJMenuBar.add(getJMenu());
          return jJMenuBar;
     private JMenu getJMenu() {
          if (jMenu == null) {
               jMenu = new JMenu("JUNK");
          return jMenu;
     public static void main(String[] args) {
          SwingUtilities.invokeLater(new Runnable() {
               public void run() {
                    EntryPoint application = new EntryPoint();
                    application.getJFrame().setVisible(true);
}

Answer 1

Using JDK1.4.2 on XP I get different results. I'm not sure what you are trying to do. The standard code for painting should be:
super.paintComponent(g);
g.drawLine(0,0,100,100);The line will start at the top left of the panel and continue until 100, 100. As the divider is moved the line will move since the panel is now being painted at a new position within the splitpane. So it is normal for the line to move when the divider is moved.
If you want to paint the line at some point relative to the top left of the panel then you can use:
super.paintComponent(g);
g.translate(100, 100);
g.drawLine(0,0,100,100);
g.translate(-100, -100);