Problem setting look and feel

It seems like I'm not able to change the windows xp look and feel, I'm using this code to change it but nothing happens, the window comes out with windows LAF:
" public static void main(String[] args)
try {
UIManager.setLookAndFeel("javax.swing.plaf.metal.MetalLookAndFeel");
} catch (Exception e) { System.out.println(e.getMessage()); }
new Ventana();
Maybe... Am I missing some code? or a specific class needs to be downloaded?
I'd apreciate any help

That was not the problem, but thank you...
I finally noticed the problem, what I was trying to do was actually done by writting this:
JComponent.setDefaultLookAndFeelDecorated(true);
Sets the OceanTheme feel on, but I noticed that when you try to use it with a Jdialog and a JFileChooser you get some ugly colors. Orange/Brown with JDialogs and Green with JFileChoosers. Is this a bug or it's ment to do that?
Does somebody know how to fix it?
Thanks for your support

Similar Messages

Setting Look and Feel gives error

Hi,
I get error when I use,
JFrame.setDefaultLookAndFeelDecorated(true);
cannot resolve symbol
symbol: method setDefaultLookAndFeelDecorated (boolean)
location : class javax.swing.JFrame
JFrame.setDefaultLookAndFeelDecorated(true);
^
1 error
I am running the example for JFrame in the site . PLease help!!

Hi,
that was solved!
thank u 4 ur time!
Do you know how to use aqua look and feel??
I have downloaded the files. demo.bat works fine! and I tested Aqua by editing demo.bat, but how to use it i nmy program?? what is the name to be given for setLookAndFeel(??)

Problem about look and feeling

i want to make my jframe looking and feeling like jdeveloper.what should i do ?

Hi,
if I remember well then JDeveloper uses the JGoodies Plastic Look and Feel. Just go to http://www.jgoodies.com/ and get the look and feel.
Frank

How come setting look and feel not successful

class gameble{
public static void main(String argv[])throws Throwable{
try {
UIManager.setLookAndFeel(
UIManager.getCrossPlatformLookAndFeelClassName());
} catch (Exception e) { }
console cs = new console();
cs.addWindowListener(new GenericWindowListener(cs.tv));
cs.setLocation(320,0);
cs.show();
with the above codes, i want java look&feel, but it still shows me window look & feel. need your help!!

CroosPlatformLookAndFeelClassName looks almost exactly like the java default look and feel.
You can try other L&F like:
try{
UIManager.setLookAndFeel(getSystemLookAndFeelClassName());
//this will take the look and feel of the OS you are working with
catch(Exception e){
System.err.println(e.getMessage());
or
try{
UIManager.setLookAndFeel("com.sun.java.swing.plaf.motif.MotiveLookAndFeel");
//this will take the look and feel of the Unix OS
catch(Exception e){
System.err.println(e.getMessage());

Setting Look and Feel in Netbeans 4.1

I'm trying to change my program's Look&Feel to the XP Look&Feel, but I can't find any way to change the post-init code for a JFrame. Surely this is possible, but the Code tab for JFrames is very limited and for the life of me I can't find any other way to customize the initialization of one.
How would one go about doing this?
Thanks,
Jick

Well, I managed to solve my own problem. For reference, I'll explain the process.
My searches involved looking through the NetBeans interface to change the proper implementation code, but this was actually not necessary. NetBeans' code is very strictly protected by its code-locking mechanism, but the right place to insert the code to change the UI is immediately before the initComponents() method call in your JFrame's constructor.
Example:
public class SmartMoverGUI extends javax.swing.JFrame {
public SmartMoverGUI() {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch(Exception e) {}
initComponents();
/* Rest of code below */
Hope this helps someone. :)

Can't set look and feel?

It's been a while since I've done GUIs. I thought I followed all the instructions, but I just keep getting windows defaults:
public class CVSCompare extends JFrame
public CVSCompare()
{ setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    setJMenuBar(stdMenuBar());
public static void main(String[] args)
    try
    { UIManager.setLookAndFeel(
        "javax.swing.plaf.metal.MetalLookAndFeel");
    } catch (Exception e) { }
    CVSCompare c = new CVSCompare();
    c.pack();
    c.show();
}

If there is a problem occuring when the L&F is set the following will show it......
try    {
    UIManager.setLookAndFeel( "javax.swing.plaf.metal.MetalLookAndFeel");
catch (Exception e)
e.printStackTrace();
}if this doesn't show anything then you must be setting the L&F somewhere else later on...
nes

Swing disabled components look and feel problem.

Hi All,
I have a Swing application. My system is recently upgraded to JRE 1.6 and I'm facing problem with look and feel of swing components when they are disabled. Color of disabled components is very faint and its being difficult to read the text in such disabled components. In JRE 1.4 this problem was not there. Please let me know what I can do to get the look and feel(Color and Font) of disabled components, same as JRE 1.4.
Thanks

Sandip_Jarad wrote:
..I have a Swing application. My system is recently upgraded to JRE 1.6 and I'm facing problem with look and feel of swing components when they are disabled. Which look and feel is the application using? As an aside, did it never occur to you to mention the PLAF?
..Color of disabled components is very faint and its being difficult to read the text in such disabled components. Why is it so gosh-darned important to read the text on a control that is (supposedly) not relevant or not available?
..In JRE 1.4 this problem was not there. Please let me know what I can do to get the look and feel(Color and Font) of disabled components, same as JRE 1.4. Here are some suggestions, some of them are actually serious. I'll leave it as an exercise for you, to figure out which ones.
- Run the app. in 1.4.
- Use a custom PLAF that offers a 'less faint' rendering of disabled components.
- Use Motif PLAF (I haven't checked, but I bet that has not changed since 1.4).
- Put the important text in a tool-tip.

Delay in applying Look and feel on jDialog

I am working with java1.4 / OS as windows Xp.
Recently i came across an interesting problem regarding look and feel.
Actually my syatem llok and feel was windows and i set swing application Look and feel as Metal. Now whenever i am launching any dialog on my awing application , The dialog appears in windows LAF for few nenoseconds and then changes to Metal.
Even if if check the llok and feel just before launcing the dialog i am getting Metal as result
Can any one help me out about what might be going wrong ?

I've never noticed this before. (I guiess my eyes aren't good enought to spot something for a few nanoseconds)
If you need further help then you need to create a [url http://homepage1.nifty.com/algafield/sscce.html]Short, Self Contained, Compilable and Executable, Example Program (SSCCE) that demonstrates the incorrect behaviour, because I can't guess exactly what you are doing based on the information provided.
Don't forget to use the [url http://forum.java.sun.com/help.jspa?sec=formatting]Code Formatting Tags so the posted code retains its original formatting.

Windows XP Look and Feel

Hi,
When I use Windows XP style Look & Feel on Windows XP Title Bar and Scroll Bar disappears or the color is set to transparent.
I set Look and Feel using:
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
Even I run SwingSet2 on Windows XP and set the Look & Feel to Windows XP Style the result is the same.
Is there any recommendation about this?
Thanks...

I forgot to say that I am using Java SDK v1.4.2_4

Setting defaut look and feel under Gnome generates errors.

We are migrating some of our developer machines to linux, and in the process we are testing in house applications to ensure that in program file locations are correct and that everything just works. Each of our applications set the default look and feel at startup, which hasn't been a problem until now. Errors are being generated, despite no apparent affect on the application or how the application looks. Commenting out the the line of code that sets default look and feel result in an application that looks exactly the same, but with no errors. Keeping the line commented isn't an option, since the applications look horrendous in a Windows environment w/o the Windows L&F.
My question is: Since these errors have no apparent affect on the application, do we need to worry about them? Can they be safely ignored?
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());will generate errors during application lifetime, a snippet of the errors:
(<unknown>:16565): Gtk-WARNING **: Attempting to add a widget with type GtkButton to a GtkComboBoxEntry (need an instance of GtkEntry or of a subclass)
(<unknown>:16565): Gtk-CRITICAL **: gtk_widget_realize: assertion `GTK_WIDGET_ANCHORED (widget) || GTK_IS_INVISIBLE (widget)' failed
(<unknown>:16565): Gtk-CRITICAL **: gtk_paint_box: assertion `style->depth == gdk_drawable_get_depth (window)' failed
(<unknown>:16565): Gtk-CRITICAL **: gtk_paint_box: assertion `style->depth == gdk_drawable_get_depth (window)' failed

It's a bug in jdk
look here http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=6624717
and vote for it

Problem With ButtonUI in an Auxiliary Look and Feel

This is my first post to one of these forums, so I hope everything works correctly.
I have been trying to get an axiliary look and feel installed to do some minor tweaking to the default UI. In particular, I need it to work with Windows and/or Metal as the default UI. For the most part I let the installed default look and feel handle things with my code making some colors lighter, darker, etc. I also play with focus issues by adding FocusListeners to some components. I expect my code to work reasonably well no matter what the default look and feel is. It works well with Motif, Metal, and Windows, the only default look and feels I've tested with. What I'm going to post is a stripped down version of what I have been working on. This example makes gross changes to the JButton background and foreground colors in order to illustrate what I've encountered.
I have three source code files. The first, Problem.java, creates a JFrame and adds five buttons to it. One button installs MyAuxLookAndFeel as an auxiliary look and feel using MyAuxButtonUI for the look and feel of JButtons. The next button removes that look and feel. The next button does nothing except print a line to System.out. The next button installs MyAuxLookAndFeel as an auxiliary look and feel using MyModButtonUI for the look and feel of JButtons. The last button removes that look and feel.
The problem is, when I install the first auxiliary look and feel, buttons are no longer tabable. Also, they cannot be invoked by pressing the space button when they're in focus. When I remove the first auxiliary look and feel everything reverts to behaving normally. When I add the "Mod" version, button tabability is fine. The only difference is I've added the following code:
if ( c.isFocusable() ) {
   c.setFocusable(true);
}That strikes me as an odd piece of code to profoundly change the program behavior. Anyway, after adding and removing the "Mod" look and feel, the tababilty is forever fixed. That is, if I subsequently re-install the first look and feel, tababilty works just fine.
The problem with using the space bar to select a focused button is more problematic. My class is not supposed to mess with the default look and feel which may or may not use the space bar to press the button with focus. When the commented code in MyModButtonUI is uncommented, things behave correctly. Even the statement
button.getInputMap().remove( spaceKeyStroke );doesn't mess things up after the auxiliary look and feel is removed. So far I've tested this with JRE 1.4.2_06 under Windows 2000, JRE 1.4.2_10 under Windows XP, and JRE 1.5.0_06 under Windows XP and the behavior is the same.
All of this leads me to two questions.
1. Is my approach fundamentally flawed? I've extended TextUI and ScrollBarUI with no problems. This is the only problem I've encountered with ButtonUI. My real workaround for the space bar issue is better than the one I've supplied in the example, but it certainly is not guaranteed to work for any arbitrary default look and feel.
2. Assuming I have no fundamental problems with my approach, it's possible I've found a real bug. I searched the bug database and couldn't find anything like this. Of course, this is the first time I've tried seasrching the database for a bug so my I'm doing it badly. Has this already been reported as a bug? Is there any reason I shouldn't report it?
What follows is the source code for my example. It's in three files because the two ButtonUI classes must be public in order to work. Thanks for insight you can provide.
Bill
File Problem.java:
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
public class Problem extends JFrame {
   public boolean isAuxInstalled = false;
   public boolean isModInstalled = false;
   public LookAndFeel lookAndFeel = new MyAuxLookAndFeel();
   private static int ctr = 0;
   public static void main( String[] args ) {
      new Problem();
   public Problem() {
      this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
      setSize(250, 150);
      setTitle("Button Test");
      JButton install = new JButton("Install");
      JButton remove = new JButton("Remove");
      JButton doNothing = new JButton("Do Nothing");
      JButton installMod = new JButton("Install Mod");
      JButton removeMod = new JButton("Remove Mod");
      this.getContentPane().setLayout(new FlowLayout());
      this.getContentPane().add(install);
      this.getContentPane().add(remove);
      this.getContentPane().add(doNothing);
      this.getContentPane().add(installMod);
      this.getContentPane().add(removeMod);
      install.addActionListener(new ActionListener() {
         public void actionPerformed(ActionEvent e) {
            if ( !isAuxInstalled ) {
               isAuxInstalled = true;
               UIManager.addAuxiliaryLookAndFeel( lookAndFeel );
               SwingUtilities.updateComponentTreeUI( Problem.this );
      remove.addActionListener(new ActionListener() {
         public void actionPerformed(ActionEvent e) {
            if ( isAuxInstalled ) {
               isAuxInstalled = false;
               UIManager.removeAuxiliaryLookAndFeel( lookAndFeel );
               SwingUtilities.updateComponentTreeUI( Problem.this );
      doNothing.addActionListener(new ActionListener() {
         public void actionPerformed(ActionEvent e) {
            System.out.println( "Do nothing " + (++ctr) );
      installMod.addActionListener(new ActionListener() {
         public void actionPerformed(ActionEvent e) {
            if ( !isModInstalled ) {
               isModInstalled = true;
               UIManager.addAuxiliaryLookAndFeel( lookAndFeel );
               SwingUtilities.updateComponentTreeUI( Problem.this );
      removeMod.addActionListener(new ActionListener() {
         public void actionPerformed(ActionEvent e) {
            if ( isModInstalled ) {
               isModInstalled = false;
               UIManager.removeAuxiliaryLookAndFeel( lookAndFeel );
               SwingUtilities.updateComponentTreeUI( Problem.this );
      setVisible(true);
   class MyAuxLookAndFeel extends LookAndFeel {
      public String getName() {
         return "Button Test";
      public String getID() {
         return "Not well known";
      public String getDescription() {
         return "Button Test Look and Feel";
      public boolean isSupportedLookAndFeel() {
         return true;
      public boolean isNativeLookAndFeel() {
         return false;
      public UIDefaults getDefaults() {
         UIDefaults table = new MyDefaults();
         Object[] uiDefaults = {
            "ButtonUI", (isModInstalled ? "MyModButtonUI" : "MyAuxButtonUI"),
         table.putDefaults(uiDefaults);
         return table;
   class MyDefaults extends UIDefaults {
      protected void getUIError(String msg) {
//         System.err.println("(Not) An annoying error message!");
}File MyAuxButtonUI.java:
import javax.swing.*;
import java.awt.*;
import javax.swing.plaf.*;
import javax.swing.plaf.multi.*;
import javax.accessibility.*;
public class MyAuxButtonUI extends ButtonUI {
   private Color background;
   private Color foreground;
   private ButtonUI ui = null;
   public static ComponentUI createUI( JComponent c ) {
      return new MyAuxButtonUI();
   public void installUI(JComponent c) {
      MultiButtonUI multiButtonUI = (MultiButtonUI) UIManager.getUI(c);
      this.ui = (ButtonUI) (multiButtonUI.getUIs()[0]);
      super.installUI( c );
      background = c.getBackground();
      foreground = c.getForeground();
      c.setBackground(Color.GREEN);
      c.setForeground(Color.RED);
   public void uninstallUI(JComponent c) {
      super.uninstallUI( c );
      c.setBackground(background);
      c.setForeground(foreground);
      this.ui = null;
   public void paint(Graphics g, JComponent c) {
      this.ui.paint( g, c );
   public void update(Graphics g, JComponent c) {
      this.ui.update( g, c );
   public Dimension getPreferredSize(JComponent c) {
      if ( this.ui == null ) {
         return super.getPreferredSize( c );
      return this.ui.getPreferredSize( c );
   public Dimension getMinimumSize(JComponent c) {
      if ( this.ui == null ) {
         return super.getMinimumSize( c );
      return this.ui.getMinimumSize( c );
   public Dimension getMaximumSize(JComponent c) {
      if ( this.ui == null ) {
         return super.getMaximumSize( c );
      return this.ui.getMaximumSize( c );
   public boolean contains(JComponent c, int x, int y) {
      if ( this.ui == null ) {
         return super.contains( c, x, y );
      return this.ui.contains( c, x, y );
   public int getAccessibleChildrenCount(JComponent c) {
      if ( this.ui == null ) {
         return super.getAccessibleChildrenCount( c );
      return this.ui.getAccessibleChildrenCount( c );
   public Accessible getAccessibleChild(JComponent c, int ii) {
      if ( this.ui == null ) {
         return super.getAccessibleChild( c, ii );
      return this.ui.getAccessibleChild( c, ii );
}File MyModButtonUI.java:
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import javax.swing.plaf.*;
public class MyModButtonUI extends MyAuxButtonUI
   static KeyStroke spaceKeyStroke = KeyStroke.getKeyStroke(KeyEvent.VK_SPACE, 0 );
   public static ComponentUI createUI( JComponent c ) {
      return new MyModButtonUI();
   public void installUI(JComponent c) {
      super.installUI(c);
      c.setBackground(Color.CYAN);
      if ( c.isFocusable() ) {
         c.setFocusable(true);
//      final JButton button = (JButton) c;
//      button.getInputMap().put( spaceKeyStroke, "buttonexample.pressed" );
//      button.getActionMap().put( "buttonexample.pressed", new AbstractAction() {
//         public void actionPerformed(ActionEvent e) {
//            button.doClick();
//   public void uninstallUI(JComponent c) {
//      super.uninstallUI(c);
//      JButton button = (JButton) c;
//      button.getInputMap().remove( spaceKeyStroke );
//      button.getActionMap().remove( "buttonexample.pressed" );
}

here is the code used to change the current look and feel :
try {
               UIManager.setLookAndFeel("com.sun.java.swing.plaf.motif.MotifLookAndFeel");
         catch (InstantiationException e)
              System.out.println("Error occured "+ e.toString());
         catch (ClassNotFoundException e)
              System.out.println("Error occured "+ e.toString());
         catch (UnsupportedLookAndFeelException e)
              System.out.println("Error occured "+ e.toString());
         catch (IllegalAccessException e)
              System.out.println("Error occured in .. " + e.toString());
         Dimension dim = Toolkit.getDefaultToolkit().getScreenSize();
         Fenetre fen = new Fenetre();
         fen.setSize(dim.width, dim.height);
         fen.setResizable(false);
             fen.setLocation(0, 0);
              fen.setVisible(true);

Setting the Brushed Metal look and feel for macs using Java.

Hello,
I am relatively new to Java and I am new to Mac-specific java stuff. Anyways, when I try to set the look and feel of my classes to the "apple.awt.brushMetalLook" look and feel, I am unable to. It works if I have System.setProperty("apple.awt.brushMetalLook", "true"); written before I create any swing component. This would be fine, except that means that it is impossible to extend any swing component, such as JFrame or JApplet. Is there a way around this?
Thanks!

This might answer your question:
http://lists.apple.com/archives/Java-dev/2003/Apr/msg00829.html

NetBeans: Dinamically changing Look and Feel Problem

Hi there, Java lovers.
I need some help here!
I love java, and I used to program my graphical user interfaces by hand. In my applications, there is a dropdown for the user to chose the desired look and feel. Then I save the selected option to a file and on the startup I do something like this:
UIManager.setLookAndFeel(savedUserSelectedLookAndFeel);That always worked really fine. The look and feel would change and everything worked really well.
However, programing GUI by hand is really a PITA. So I was seduced by Netbeans. I am using Netbeans 6.0 on Windows XP, and I designed the GUIs really fast now.
The problem is, the system look and feel works really well, but when I change the look and feel of my application to a different one (Java/Motif/etc..) the look and feel changes but the components positions and sizes becomes all messed up. It really becomes impossible to work with a different look and feel because some components are outside of frames.
I believe the cause of this is because Netbeans generates the code automatically using Grids and stuff like that, and by doing so, the change of the look and feel becomes messed up. This is a thing that would not happen with my manually created code.
This is really troubling me. Does someone has the same problem. Is there something I can do? Or do I need to create my GUIs by hand like before?

Oyashiro-sama (少し日本語を知っているし、そんな「様」っていう使い方はちょっと変そうですね　(^_-) 「冗談」っていう顔文字です。）
Sorry for the delay in reply, but one problem for you is that this is not a NetBeans users forum, thus you will not necessarily receive speedy replies here to your NetBeans questions. The best place to send NetBeans questions is:
[email protected]
[email protected] (for NetBeans API issues)
As for your question, you seem to already know quite a bit about NetBeans UI Look and Feel programming, but have you seen these:
WORKING WITH SWING LOOK AND FEEL:
http://java.sun.com/developer/JDCTechTips/2004/tt0309.html#1
Java GUI Swing Programming Using NetBeans 5 (should apply to NetBeans 6):
http://wiki.netbeans.org/JavaGUISwingProgrammingUsingNetBeans5
Regards,
-Brad Mayer

Problems installing the new 'Look And Feel' done by Francios Degrelle

I have download the new verison of the new 'Look And Feel' from
http://sheikyerbouti.developpez.com/forms-pjc-bean/LAF/sources/v133/LAF_133.zip
1- I defined a new section in formsweb.cfg named summit in the middle tier (AS 10g Rel2):
[Summit]
baseHTML=base.htm
baseHTMLjinitiator=basejpi.htm
baseHTMLjpi=basejpi.htm
baseHTMLie=baseie.htm
HTMLdelimiter=%
workingDirectory=e:\app\summit
envFile=default.env
IE=JInitiator
escapeparams=true
form=customers_laf
debug=no
otherparams=buffer_records=%buffer% debug_messages=%debug_messages% array=%array% obr=%obr% query_only=%query_only% quiet=%quiet% render=%render% record=%record% tracegroup=%tracegroup% log=%log% term=%term% useSDI=yes
buffer=no
debug_messages=no
array=no
obr=no
query_only=no
quiet=yes
render=no
pageTitle=Summit
serverURL=/forms/lservlet
codebase=/forms/java
imageBase=DocumentBase
width=100%
height=100%
separateFrame=false
splashScreen=no
lookAndFeel=oracle
colorScheme=blue
logo=no
restrictedURLparams=HTMLbodyAttrs,HTMLbeforeForm,pageTitle,HTMLafterForm,log,allow_debug,allowNewConnections
serverApp=default
archive_jini=frmall_jinit.jar
archive=frmall.jar,laf.jar
WebUtilArchive=
jpi_download_page=http://java.sun.com/products/archive/j2se/1.4.2_09/index.html
jpi_classid=clsid:8AD9C840-044E-11D1-B3E9-00805F499D93
jpi_codebase=http://java.sun.com/products/plugin/autodl/jinstall-1_4-windows-i586.cab#Version=1,4,0,0
2- then I put a copy of the file 'forms.css' in the middle tier in the folder :
apache\apache\htdocs
so as to be on the path and then modified PM$CSS_FILENAME in all forms to be 'forms.css' instead of 'c:\forms.css' and recompiled.
3-I put a copy of the file 'laf.jar' in the folder : 'd\Ora_AS\forms\java' in the middle tier and added this path to the classpath environment variable.
4- I restarted the middle tier and wrote this URL:
http://test/forms/frmservlet/config=summit
the customers form opened but with no background images,I added the following to the URL '&form=test_laf_color_scheme.fmx',the form opened with the default color scheme to 'purple',I changed it from a drop down list to orange and all buttons background color degraded to orange.
My questions:
1-where are the background images ?
2- I cannot compile the 'laf.pll' file to 'laf.plx',when I compile I get this error:
FRm-91507 -internal error
P.S. I read this thread :
FRM-91507 when compiling a library with Forms 6i
and I didn't understand it,where do I change the Forms_Path? in the forms Home release 1 or Forms home release 2?!!!
3-Is the 'forms.css' file properly located? if not? where do I put it?
Sorry for the long scenario but I'm really confused?
Thanks
Mohammad

Hello,
I'm curently out of everything so I cannot answer this one. All I can tell is that images are read from the client machine or jar file. If you want read images from the application server, you need the http:// syntax.
Francois

Problem with java look and feel

Hi! This is my first time posting here. Do apologize me if I am not familiar with the regulations here. Thanks!
Currently, I am developing a project using NetBeans IDE. It is using RMI, and some basic UI. I am facing the following error when I tried applying the java look and feel code. Please see below for the code used and the error message.
try {   UIManager.setLookAndFeel("com.sun.java.swing.plaf.windows.WindowsLookAndFeel");
} catch (Exception e) { }
Exception in thread "AWT-EventQueue-0" java.lang.ClassCastException: javax.swing.plaf.ColorUIResource cannot be cast to java.util.List
at javax.swing.plaf.metal.MetalUtils.drawGradient(MetalUtils.java:196)
at javax.swing.plaf.metal.MetalInternalFrameTitlePane.paintComponent(MetalInternalFrameTitlePane.java:384)
at javax.swing.JComponent.paint(JComponent.java:1027)
at javax.swing.JComponent.paintChildren(JComponent.java:864)
at javax.swing.JComponent.paint(JComponent.java:1036)
at javax.swing.JComponent.paintChildren(JComponent.java:864)
at javax.swing.JComponent.paint(JComponent.java:1036)
at javax.swing.JLayeredPane.paint(JLayeredPane.java:564)
at javax.swing.JComponent.paintChildren(JComponent.java:864)
at javax.swing.JComponent.paint(JComponent.java:1036)
at javax.swing.JComponent.paintChildren(JComponent.java:864)
at javax.swing.JComponent.paint(JComponent.java:1036)
at javax.swing.JLayeredPane.paint(JLayeredPane.java:564)
at javax.swing.JComponent.paintChildren(JComponent.java:864)
at javax.swing.JComponent.paintToOffscreen(JComponent.java:5129)
at javax.swing.BufferStrategyPaintManager.paint(BufferStrategyPaintManager.java:285)
at javax.swing.RepaintManager.paint(RepaintManager.java:1128)
at javax.swing.JComponent.paint(JComponent.java:1013)
at java.awt.GraphicsCallback$PaintCallback.run(GraphicsCallback.java:21)
at sun.awt.SunGraphicsCallback.runOneComponent(SunGraphicsCallback.java:60)
at sun.awt.SunGraphicsCallback.runComponents(SunGraphicsCallback.java:97)
at java.awt.Container.paint(Container.java:1797)
at javax.swing.RepaintManager.paintDirtyRegions(RepaintManager.java:734)
at javax.swing.RepaintManager.paintDirtyRegions(RepaintManager.java:679)
at javax.swing.RepaintManager.seqPaintDirtyRegions(RepaintManager.java:659)
at javax.swing.SystemEventQueueUtilities$ComponentWorkRequest.run(SystemEventQueueUtilities.java:128)
at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:597)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:273)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:183)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:173)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:168)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:160)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:121)
Java Result: 1

Thanks for everyone's help!
Below is the executable code generated using NetBeans which is enough to generate the error message. Sometimes you can get the error message just by running the program. Sometimes the error will occur when you go into the Menu and click on Item.
* NewJFrame.java
* Created on January 8, 2008, 1:11 PM
package client;
import javax.swing.UIManager;
* @author Yang
public class NewJFrame extends javax.swing.JFrame {
    /** Creates new form NewJFrame */
    public NewJFrame() {
        initComponents();
    /** This method is called from within the constructor to
     * initialize the form.
     * WARNING: Do NOT modify this code. The content of this method is
     * always regenerated by the Form Editor.
    // <editor-fold defaultstate="collapsed" desc=" Generated Code ">
    private void initComponents() {
        jDesktopPane1 = new javax.swing.JDesktopPane();
        jInternalFrame1 = new javax.swing.JInternalFrame();
        jMenuBar1 = new javax.swing.JMenuBar();
        jMenu1 = new javax.swing.JMenu();
        jMenuItem1 = new javax.swing.JMenuItem();
        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
        javax.swing.GroupLayout jInternalFrame1Layout = new javax.swing.GroupLayout(jInternalFrame1.getContentPane());
        jInternalFrame1.getContentPane().setLayout(jInternalFrame1Layout);
        jInternalFrame1Layout.setHorizontalGroup(
            jInternalFrame1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGap(0, 190, Short.MAX_VALUE)
        jInternalFrame1Layout.setVerticalGroup(
            jInternalFrame1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGap(0, 95, Short.MAX_VALUE)
        jInternalFrame1.setBounds(80, 40, 200, 130);
        jDesktopPane1.add(jInternalFrame1, javax.swing.JLayeredPane.DEFAULT_LAYER);
        jMenu1.setText("Menu");
        jMenuItem1.setText("Item");
        jMenuItem1.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                jMenuItem1ActionPerformed(evt);
        jMenu1.add(jMenuItem1);
        jMenuBar1.add(jMenu1);
        setJMenuBar(jMenuBar1);
        javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
        getContentPane().setLayout(layout);
        layout.setHorizontalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addComponent(jDesktopPane1, javax.swing.GroupLayout.DEFAULT_SIZE, 484, Short.MAX_VALUE)
                .addGap(20, 20, 20))
        layout.setVerticalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addComponent(jDesktopPane1, javax.swing.GroupLayout.DEFAULT_SIZE, 279, Short.MAX_VALUE)
        pack();
    }// </editor-fold>
    private void jMenuItem1ActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
        jInternalFrame1.setVisible(true);
     * @param args the command line arguments
    public static void main(String args[]) {
        java.awt.EventQueue.invokeLater(new Runnable() {
            public void run() {
                new NewJFrame().setVisible(true);
        try {
            UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
        } catch (Exception e) {
            e.printStackTrace();
    // Variables declaration - do not modify
    private javax.swing.JDesktopPane jDesktopPane1;
    private javax.swing.JInternalFrame jInternalFrame1;
    private javax.swing.JMenu jMenu1;
    private javax.swing.JMenuBar jMenuBar1;
    private javax.swing.JMenuItem jMenuItem1;
    // End of variables declaration
}Edited by: Boxie on Jan 7, 2008 11:23 PM

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