After changing LookAndFeel: Exception: Colors cannot be null

Question

Hi All!
I've just created a frame and an internal frame. But after I close the internal frame and change the look and feel (for example from windows to windows classic) and reuse of the internal frame I've get the following exception:
Exception in thread "AWT-EventQue-0" java.lang.NullPointerException: Colors cannot be null.
Here's my codes:
package myprojects.probe_1;
import javax.swing.SwingUtilities;
public class Probe_1
  private static JProbeMainFrame frmMain;
  public static void main( String[] args )
    javax.swing.SwingUtilities.invokeLater(
      new Runnable()
        public void run()
          frmMain = new JProbeMainFrame();
          frmMain.setVisible( true );
package myprojects.probe_1;
import java.awt.*;
import java.awt.event.*;
import javax.swing.JFrame;
import javax.swing.JMenuBar;
import javax.swing.JMenu;
import javax.swing.JMenuItem;
import javax.swing.JRadioButtonMenuItem;
import javax.swing.ButtonGroup;
import javax.swing.KeyStroke;
import javax.swing.JInternalFrame;
import javax.swing.JDesktopPane;
import javax.swing.UIManager;
import javax.swing.SwingUtilities;
public class JProbeMainFrame extends JFrame
  private JDesktopPane dskDesktop;
  private JCountriesEditor frmCountriesEditor;
  public JProbeMainFrame()
    super( "JProbeMainFrame" );
    int inset = 50;
    Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();
    setBounds( inset, inset, screenSize.width - inset * 2, screenSize.height - inset * 2 );
    dskDesktop = new JDesktopPane();
    setContentPane( dskDesktop );
    setJMenuBar( createMainMenuBar() );
    this.addWindowListener(
      new WindowAdapter()
        public void windowClosing( WindowEvent evt )
          JProbeMainFrame.this.closeWindow();
    setLookAndFeelTo( UIManager.getSystemLookAndFeelClassName() );
  // Main menu.
  protected JMenu createFileMenu()
    JMenu mnuMenu;
    JMenuItem mniMenuItem;
    mnuMenu = new JMenu( "File" );
    mnuMenu.setMnemonic( KeyEvent.VK_F );
    mnuMenu.getAccessibleContext().setAccessibleDescription( "Standard file menu." );
    // Items.
    mniMenuItem = new JMenuItem( "Exit", KeyEvent.VK_X );
    mniMenuItem.setAccelerator(
      KeyStroke.getKeyStroke( KeyEvent.VK_X, ActionEvent.ALT_MASK ) );
    mniMenuItem.getAccessibleContext().setAccessibleDescription(
      "Terminates the application." );
    mniMenuItem.addActionListener(
      new ActionListener()
        public void actionPerformed( ActionEvent evt )
          JProbeMainFrame.this.closeWindow();
    mnuMenu.add( mniMenuItem );
    return mnuMenu;
  protected JMenu createSettingsMenu()
    JMenu mnuMenu;
    JMenu smnSubMenu;
    JMenuItem mniMenuItem;
    ButtonGroup rbgRadioButtonGroup;
    JRadioButtonMenuItem rmiRadioMenuItem;
    mnuMenu = new JMenu( "Settings" );
    mnuMenu.setMnemonic( KeyEvent.VK_S );
    mnuMenu.getAccessibleContext().setAccessibleDescription( "Set up how to work the application." );
    // Items.
    mniMenuItem = new JMenuItem( "Countries", KeyEvent.VK_C );
    mniMenuItem.setAccelerator(
      KeyStroke.getKeyStroke( KeyEvent.VK_C, ActionEvent.ALT_MASK ) );
    mniMenuItem.getAccessibleContext().setAccessibleDescription(
      "Maintenance the available countries." );
    mniMenuItem.addActionListener(
      new ActionListener()
        public void actionPerformed( ActionEvent evt )
          if ( frmCountriesEditor != null && frmCountriesEditor.isClosed() )
            // Resue of the internal frame!!!
            dskDesktop.add( frmCountriesEditor );
            frmCountriesEditor.setVisible( true );
          else if ( frmCountriesEditor == null )
            frmCountriesEditor = new JCountriesEditor();
            dskDesktop.add( frmCountriesEditor );
            frmCountriesEditor.setVisible( true );
          if ( frmCountriesEditor.isIcon() )
            try
              frmCountriesEditor.setIcon( false );
            catch ( Exception exc ) { }
          try
            frmCountriesEditor.setSelected( true );
          catch ( Exception exc ) { }
    mnuMenu.add( mniMenuItem );
    mnuMenu.addSeparator();
    smnSubMenu = new JMenu( "Look and Feel" );
    smnSubMenu.setMnemonic( KeyEvent.VK_S );
    smnSubMenu.getAccessibleContext().setAccessibleDescription( "Set the Look and Feel to desired one." );
    rbgRadioButtonGroup = new ButtonGroup();
    UIManager.LookAndFeelInfo[] lafiLookAndFeelInfo = UIManager.getInstalledLookAndFeels();
    String strLookAndFeelName;
    ActionListener alActionListener = new alLookAndFeelActionListener();
    for ( int idxIndex = 0; idxIndex < lafiLookAndFeelInfo.length; idxIndex++ )
      strLookAndFeelName = lafiLookAndFeelInfo[ idxIndex ].getName();
      rmiRadioMenuItem = new JRadioButtonMenuItem( strLookAndFeelName );
      if (UIManager.getSystemLookAndFeelClassName() == lafiLookAndFeelInfo[ idxIndex ].getClassName() )
        rmiRadioMenuItem.setSelected( true );
      rmiRadioMenuItem.getAccessibleContext().setAccessibleDescription(
      "Set the look and feel like " + strLookAndFeelName + "." );
      rmiRadioMenuItem.setActionCommand( lafiLookAndFeelInfo[ idxIndex ].getClassName() );
      rmiRadioMenuItem.addActionListener( alActionListener );
      rbgRadioButtonGroup.add( rmiRadioMenuItem );
      smnSubMenu.add( rmiRadioMenuItem );
    mnuMenu.add( smnSubMenu );
    return mnuMenu;
  protected JMenuBar createMainMenuBar()
    JMenuBar mbrMainMenuBar = new JMenuBar(); // Create menu bar.
    mbrMainMenuBar.add( createFileMenu() );
    mbrMainMenuBar.add( createSettingsMenu() );
    return mbrMainMenuBar;
  private class alLookAndFeelActionListener implements ActionListener
    public void actionPerformed( ActionEvent evt )
      setLookAndFeelTo( evt.getActionCommand() );
  protected void setLookAndFeelTo( String strLookAndFeel )
    try
      UIManager.setLookAndFeel( strLookAndFeel );
      SwingUtilities.updateComponentTreeUI( this );
    catch ( Exception exc ) { }
  protected void closeWindow()
    System.exit( 0 );
package myprojects.probe_1;
import java.awt.event.*;
import java.awt.*;
import javax.swing.JInternalFrame;
public class JCountriesEditor extends JInternalFrame
  public JCountriesEditor()
    super( "JCountriesEditor", true, true, false, true );
    setSize( 200, 400 );
    setLocation( 100, 100 );
}What should I take to avoid the exception or this is a bug in the JSE 1.6.0-beta2-x86 library. Before I forget, running on WinXP SP2 Hun.
Thanks!
Best Regards:
Georgee

Answer 1

For a short bit of informatin: I also tried setting up the Calendar's configured Incoming E-Mail Address in AD as a contact - no difference.