Problem with setContentPane() in JFrame class

I recently discovered a problem with the setContentPane method in the JFrame class. When I use setContentPane(Container ..), the previously existing contentPane remains in the stack. I have tried nullifying getContentPane(), and all manner of things, but, each time I use setContentPane, I have another instance of a JPanel in the stack.
I'm using code similar to setContentPane(new CustomJPanel()); and each time the user changes screens, and a similar call to that is made, the old CustomJPanel instance remains in the stack. Can anyone suggest a way around this? On their own the panels do not take up very much memory, but after several hours of usage, they will build up.

I tried what you suggested; it only resulted in a huge performance decrease. The problem with memory allocation is still there.
Here is the method I use to switch screens in my app:
public static void changeScreen (JPanel panel){
          try{
               appFrame.setTitle("Wordinary : \""+getTitle()+"\"");
               appFrame.setContentPane(panel);
               appFrame.setSize(appFrame.getContentPane().getPreferredSize());
               appFrame.getContentPane().setBackground(backColour);
               for (int i = 0; i < appFrame.getContentPane().getComponents().length; i++)
                    appFrame.getContentPane().getComponents().setForeground(textColour);
               //System.out.println("Background colour set to "+backColour+" text colour set to "+textColour);
               appFrame.validate();
          catch (Exception e){
               //System.out.println("change");
               e.printStackTrace();
And it is called like this:
changeScreen(new AddWordPanel());The instantiation of the new instance is what is causing the memory problems, but I can't think of a way around it.

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However, as you can see, my main class is a JApplet because ideally I want View to be a JPanel that I add to the applet. All I did was change "extends JFrame" to "extends JApplet" and (...)What do you mean? View extends JApplet? I thought View was meant to extend JPanel in the end...
When I run it however, it appears really really small. It seems like its drawing the panel to the default size of the applet viewer and doesn't resize it when I resize the applet.Or, the panel has its preferred size, and this latter is too small. Actually the panel has the size its container's layout manager awards it (taking or not the panel's preferred, minimum, and maximum sizes into account). See the tutorial on [layout managers|http://java.sun.com/docs/books/tutorial/uiswing/layout/index.html] .
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N.B.: there are a lot of "likely" and "presumably" in my reply: in order to avoid hardly-educated guesses especially on what is or isn't in your actual code, you'd better provide an SSCCE , which means reproducing the problem without the 3rd party library.

Problem with ScrollPane and JFrame Size

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I'm not going to even attempt to resolve the problem posted. There are other problems with your code that should take priority.
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Hi
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Hello Joanne,
Congratulations! I'm very happy that you've managed to fix your problem. It's
always essential to understand how to package applications when deploying on BEA
WebLogic. Usually, by throwing everything into an EAR file solves just about all
the class loader problems. :-) Let us know if you have any further problems that
we can assist you with.
Best regards,
Ryan LeCompte
[email protected]
http://www.louisiana.edu/~rml7669
"Joanne Corless" <[email protected]> wrote:
>
>
I've fixed it!!!!!!!!
Thanks to everyone who gave me help!!!!
The class loader was the culprit which is what I suspected all along.
As soon
as I put the 2 jar files I was using into an EAR file the problem went
away!!!!!
Thanks again
Jo Corless
"Ryan LeCompte" <[email protected]> wrote:
Hello Joanne,
As Mr. Woollen mentioned, I also believe it's a problem with the class
loader.
You need to be careful how you arrange your EJBs, because WebLogic has
a specific
method in which it loads classes in an EAR, JAR, and WAR file(s). Please
refer
to http://dev2dev.bea.com/articles/musser.jsp for more information about
BEA WebLogic
class loading mechanisms and caveats. Also, try printing out the various
methods
that are available on the object that was returned to you via reflection.
For
example, use the getMethods() method, which returns an array of Method
objects
that you can subsequently cycle through and print out the various method
names.
This way you can discover if the class found/returned to you is indeed
the one
you intend to locate.
Hope this helps,
Ryan LeCompte
[email protected]
http://www.louisiana.edu/~rml7669
Rob Woollen <[email protected]> wrote:
I believe the issue is the home interface class for this EJB is not
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If you do:
getClass().getClassLoader().loadClass(homeInterfaceClassName)
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loadable.
-- Rob
Joanne Corless wrote:
Hi Slava,
If I make my code look like you describe below I get a compliationerror telling
me that
home.getMethod() is not recognised (no such method)
If I change it slightly and use
Method homeCreateMethod =
home.getClass().getMethod(homeCreate,homeCreateParam);
The code will compile OK but when executed it still throws a NoSuchMethodException
Any ideas ?
Thanks for your help so far
Regards
Jo Corless
Your code should look like
Object home = pCtx.lookup(pJNDIName);
Method homeCreateMethod =
home.getMethod(homeCreate,homeCreateParam);
return homeCreateMethod.invoke(home, homeCreateParamValues);
Regards,
Slava Imeshev
"Joanne Corless" <[email protected]> wrote in message
news:[email protected]...
Hi Ryan,
I also wanted to mention that if you do a "header search" in this
particular
newsgroup
with the search query as "reflection", you will see many previousmessages
regarding
reflection and EJBs. I believe you could learn a lot from thedifficulties
that
others have faced and solved.I tried that and although there was a number of similar cases noneof them
actually
seem to fix my issue. Thanks for the suggestion though
Are the EJBs that you are trying to access accessible via your
system
classpath?
Try to avoid having them accessible via the main system classpath,and
only bundle
them in your appropriate EJB jar files (contained in an EAR file,for
example).Maybe I should have laid the problem out a little clearer.
I have a number of EJB's bundled up in a JAR file which is hot deployedto
the
server. Within this first JAR file is an EJB (SSB) component that
needs
to
be
able to invoke a known method on another EJB. This second EJB may
or
may
not be
within the first JAR file but it also will be hot deployed.
The component trying to invoke the method on the 2nd EJB has to
be
able to
create
an instance of the 2nd EJB without actually knowing anything bar
a
JNDI
Name which
is passed in at runtime.
I can get as far as doing the
Object home = pCtx.lookup(pJNDIName);
This returned a class with the name
"com.csc.edc.projects.allders.httppostoffice.postman.PostmanBean_mp8qy2_Home
Impl_WLStub"
My problem seems to occur when I try and invoke the create method
Method homeCreate = home.getClass().getMethod("create", new Class[0]);
My code throws a java.lang.NoSuchMethodException at this point so
I
am
unable
to progress to the next step of :
Object bean = homeCreate.invoke(home, null);
So I can return the instantiated bean back to the calling client.
Why am I getting the NoSuchMethodException, is is because I am gettinga
stub
back rather than the home interface and if so how do I get the truehome
interface
from the bean
Thanks in advance
Jo Corless

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Edited by: 886674 on 4 oct. 2011 08:31
Edited by: 886674 on 4 oct. 2011 08:35

Hello,
I am not sure if it is as short as you want to, but anyway there cannot be less classes than that, because I need each of them and any further reduction
would falsify the situation given.
Also there are only some lines which are determining size, location - and especially Layout - etc which I left nearly as they are.
Before using the given function addComponent() I had big problems to get a proper GUI Layout so I changed not to much concerning the layout (I didn't want to take the risk that nothing appears at all (or not at the right place) as I experienced many times before).
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import java.awt.Dimension;
import java.awt.FlowLayout;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.GridLayout;
import java.awt.Toolkit;
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import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTextField;
import org.jdesktop.beansbinding.AutoBinding;
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    private JPanel pnlMitte;
    private KonstantenPanel kp = null;
    private   Dimension screendimension;
    private   Dimension dimension;
    public Mainframe(){
    super();
    this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    screendimension = Toolkit.getDefaultToolkit().getScreenSize();
    dimension = new Dimension();
    dimension.setSize(400, 400);
    this.setSize(dimension);
    this.setLocation((int) ((screendimension.getSize().getWidth()) / 2), (int) (screendimension.getSize().getHeight()/ 2));
    init();
public void init(){
desktopMalen();
private void desktopMalen() {
         this.setLayout(new BorderLayout(20, 20));
        this.add(NordPanelMalen(), BorderLayout.NORTH);
        this.add(CenterPanelMalen(), BorderLayout.WEST);
        this.add( new JPanel(),BorderLayout.SOUTH);
    private JPanel NordPanelMalen() {
        pnlOben = new JPanel(new FlowLayout(FlowLayout.LEFT));
        pnlOben.add(new JLabel("Test"));
       return pnlOben ;
   private JPanel CenterPanelMalen() {
        this.pnlMitte = new JPanel(); //new FlowLayout(FlowLayout.CENTER
        this.pnlMitte.setLayout(new GridLayout(1, 1));
        Dimension d = new Dimension();
        this.pnlMitte.setSize(400,400); d.setSize(400, 400);
        KonstantenPanel bp = new KonstantenPanel(d); //// the panel with the swing component
         this.pnlMitte.add(bp);
return pnlMitte;
class KonstantenPanel extends JPanel {
    public static final long serialVersionUID = 1111111;
    private Systemdaten systemDaten = null;
    private JTextField messtemperatur;
    private BindingGroup bindinggroup = null;
    private Binding binding;
    private SystemBindingListener sbl1;
    public KonstantenPanel(Dimension d) {
    this.setSize(d);
    init();
    private void init() {
   systemDaten = new Systemdaten();           /////// the bean class
    GridBagLayout gbl = new GridBagLayout();
   this.setLayout(gbl);
    this.addComp(gbl,new JLabel("Konstanten"),0,0,4,1,0,0,GridBagConstraints.HORIZONTAL, GridBagConstraints.NORTHWEST);
    this.addComp(gbl,new JLabel("                   "),     0,1,4,1,0,0,GridBagConstraints.HORIZONTAL, GridBagConstraints.NORTHWEST);
    this.addComp(gbl,new JLabel("Messtemperatur   "),       0,2,2,1,0,0,GridBagConstraints.HORIZONTAL, GridBagConstraints.NORTHWEST);
                                                            /////the swing component using beansbinding
   messtemperatur = new JTextField("298.15             ");
   messtemperatur.setName("messtemperatur");
   this.addComp(gbl,messtemperatur , 0,3,2,1,0,0,GridBagConstraints.HORIZONTAL, GridBagConstraints.NORTHWEST);
                                                     ///all the binding is done here in:
   bindProperties();
    @SuppressWarnings("unchecked")
        private void bindProperties() {
     Property textProperty = BeanProperty.create("text");
        bindinggroup=new BindingGroup();
     binding = Bindings.createAutoBinding(
       AutoBinding.UpdateStrategy.READ_WRITE, // two-way binding
       systemDaten,                 // bean
       BeanProperty.create("messtemperatur"),
       messtemperatur,        //field
       textProperty,        //name of property
       "messtemperatur" //name
        sbl1 = new SystemBindingListener(systemDaten.getMesstemperatur());
        binding.addBindingListener(sbl1);
        binding.setConverter(null);
     binding.setValidator(null);
         binding.bind();
         bindinggroup.addBinding(binding);
    bindinggroup.bind();
     public void addComp (   //Container cont,
                         GridBagLayout gbl, Component c, int x, int y, int width, int height, double weightx, double weighty, int cbc, int a)
    GridBagConstraints gbc = new GridBagConstraints();
    gbc.fill = cbc ; //GridBagConstraints.BOTH;
    gbc.gridx = x; gbc.gridy = y;
    gbc.gridwidth = width; gbc.gridheight = height;
    gbc.weightx = weightx; gbc.weighty= weighty;
    gbc.anchor = a; gbl.setConstraints(c, gbc);
    this.add(c);
     * in praxis the extra class would be especially interesting if there are more variables     *
class SystemBindingListener implements BindingListener {
    private double value = 0.0;
    SystemBindingListener(double value) {
     super();
     this.setValue(value);
    private final PropertyChangeSupport propertyChangeSupport =     new PropertyChangeSupport(this);
    void addPropertyChangeListener(PropertyChangeListener l) {
     propertyChangeSupport.addPropertyChangeListener(l);
    void removePropertyChangeListener(PropertyChangeListener l) {
     propertyChangeSupport.removePropertyChangeListener(l);
             @Override
                public void bindingBecameBound(Binding binding) {
                    System.out.println("bound ok " + binding.getName()); }
            @Override
                public void bindingBecameUnbound(Binding binding) {
                    System.out.println("unbound ok " + binding.getName()); }
            @Override
                public void syncFailed(Binding binding, SyncFailure failure) {
                    System.out.println("sync not ok " + binding.getName()); }
            @Override
                public void synced(Binding binding) {
                this.setValue(value);
                  System.out.println("sync ok " + binding.getName() + this.getValue()); }
            @Override
                public void sourceChanged(Binding binding, PropertyStateEvent event) {
                    System.out.println("source ok " + binding.getName());    }
            @Override
                public void targetChanged(Binding binding, PropertyStateEvent event) {
                    System.out.println("target ok " + binding.getName()); }
        double getValue(){
         return value;
       void setValue(double value){
        final double old = this.value;
     this.value = value;
     propertyChangeSupport.firePropertyChange(
                      "value", // the name of the property
                      old, // the old value
                      value // the new value
        this.value = value;
class Systemdaten {
static final long serialVersionUID = 1111111L;
    private double messtemperatur = 298.15;
    private final PropertyChangeSupport propertyChangeSupport =     new PropertyChangeSupport(this);
   void addPropertyChangeListener(PropertyChangeListener l) {
     propertyChangeSupport.addPropertyChangeListener(l);
   void removePropertyChangeListener(PropertyChangeListener l) {
     propertyChangeSupport.removePropertyChangeListener(l);
double getMesstemperatur() {
        return messtemperatur;
   void setMesstemperatur(double messtemperatur) {
        final double old = this.messtemperatur;
     this.messtemperatur = messtemperatur;
     propertyChangeSupport.firePropertyChange(
                      "messtemperatur", // the name of the property
                      old, // the old value
                      messtemperatur // the new value
        this.messtemperatur = messtemperatur;
}Due to your questions I guess to know why it there is no binding between the Listener-Instance and the Swing-Compound but
I don't see how to get all three classes working together.
I mean: If I want to have a binding between the value variable in the BindingListener and the SwingCompound I need to create such a binding in the panel-Class.
But I only created a binding with the field in systemDaten because this is the bean I want to work with.
It seems that I didn't understand how it is managed that the value is changing in the bean and the swingcompound simultaneously - after creating and adding the
BindingListener-Instance.
In the two other cases there is still a communication between the Listener and the swingCompound but in the given case there is not.
I was not aware of this problem before and I am still not sure to fully understand why it works in the other cases.
Do I need to give the binding variable or swing compound to the BindingListener to keep communication ?
Thanks for your help
Thommy

Problem with threads in JFrame

Hy everyone...i have a small problem when i try to insert clock in my JFrame , because all i get is an empty text field.
What i do is that i create inner class that extends Thread and implements Runnable , but i dont know ... i saw some examples on the intrnet...but they are all for Applets...
Does any one know how i can implement this in JFrame (JTextField in JFrame).
Actually any material on threads in JFrame or JPanel would be great....THNX.

For my original bad thread version, I have rewritten it mimicking javax.swing.Timer
implementation, reducing average CPU usage to 2 - 3%.
Will you try this:
import javax.swing.*;
import java.awt.*;
import java.text.*;
import java.util.*;
public class SamurayClockW{
JFrame frame;
Container con;
ClockTextFieldW ctf;
public SamurayClockW(){
    frame = new JFrame();
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    con = frame.getContentPane();
    ctf = new ClockTextFieldW();
    con.add(ctf, BorderLayout.SOUTH);
    frame.setBounds(100, 100, 300, 300);
    frame.setVisible(true);
    ctf.start();
public static void main(String[] args){
    new SamurayClockW();
class ClockTextFieldW extends JTextField implements Runnable{
String clock;
boolean running;
public ClockTextFieldW(){
    setEditable(false);
    setHorizontalAlignment(RIGHT);
public synchronized void start(){
    running = true;
    Thread t = new Thread(this);
    t.start();
public synchronized void stop(){
    running = false;
public synchronized void run(){
    SimpleDateFormat sdf = new SimpleDateFormat("HH:mm:ss");
    try{
      while (running){
        clock = sdf.format(new Date());
        SwingUtilities.invokeLater(new Runnable(){
          public void run(){
            setText(clock);
        try{
          wait(1000);
        catch (InterruptedException ie){
          ie.printStackTrace();
    catch (ThreadDeath td){
      running = false;
}

Problem with IconImage for JFrame

If I create an BufferedImage by ImageIO.read for example and then call getScaledInstance on this image and set the scaled Image to a JFrame as the IconImage (via setIconImage(Image image)), the application hangs.
Has anyone else this problem?

ok ok, i read it and now think that this is a sscce:
import java.awt.Image;
import java.io.File;
import java.io.IOException;
import javax.imageio.ImageIO;
import javax.swing.ImageIcon;
import javax.swing.JFrame;
import javax.swing.JLabel;
public class Start
     public static void main(String[] args)
          final JFrame frame = new JFrame();
          final Image image, imageScaled;
          try
               image = ImageIO.read(new File("test.png"));
               imageScaled = image.getScaledInstance(8, 8, Image.SCALE_DEFAULT);
               frame.add(new JLabel(new ImageIcon(image)));
               //frame.setIconImage(image); works
               frame.setIconImage(imageScaled); // works not
               frame.pack();
               frame.setVisible(true);
          catch (IOException e)
               System.err.println(e.getMessage());
               e.printStackTrace(System.err);
}

Problem with backspace on JFrame

Hello,
I have a problem on a JFrame. Indeed, I add a keyListener to the frame, but the "Bakcspace" don't work. There is anything when a I press on Backspace (with KeyTyped, KeyReleased and KeyPressed). All other keys are working.
Thanks.

the solution of the problem is :
Version note: This page reflects the focus API introduced in released 1.4. As of that release, the focus subsystem consumes focus traversal keys, such as Tab and Shift Tab. If you need to prevent the focus traversal keys from being consumed, you can call
component.setFocusTraversalKeysEnabled(false)
on the component that is firing the key events. Your program must then handle focus traversal on its own. Alternatively, you can use a KeyEventDispatcher to pre-listen to all key events. The focus page (in the Creating a GUI with JFC/Swing trail) has detailed information on the focus subsystem.

Problem with axis2 and QName class

Hello,
We have deployed AXIS2 library with a library project (J2EE server component) as it is specify by a SAP guide. We deployed the sda file correctly and we know how to reference this library in Portal Application and J2ee Module WEB or EJB.
The problem is when we want to use internally javax.xml.namespace.QName is thrown an exception. This exception is shown bellow:
java.lang.LinkageError: loader constraints violated when linking javax/xml/namespace/QName class
at wpt.ConventerStub.populateAxisService(ConventerStub.java:52)
at wpt.ConventerStub.<init>(ConventerStub.java:100)
at wpt.ConventerStub.<init>(ConventerStub.java:89)
at wpt.ConventerStub.<init>(ConventerStub.java:140)
at wpt.ConventerStub.<init>(ConventerStub.java:132)
at com.eadscasa.axis2.Axis2Converter.doContent(Axis2Converter.java:26)
In the guide is said that we have to deploy a library project to avoid this problem but we still are getting it. I have realized that Qname class is a basic class into the JDK 1.4 and in different projects as AXIS2 making revision about this class.
How can I deploy these libraries (jars) without dependencies with SAP Portal libraries?
Is there any way to setup the classloader to avoid this error?
In the documentation about this kind of project it is said that you cannot deploy libraries (*.jar) with the same name. I donu2019t know if it happens the same with the class.
We have to develop web Services with Soap 1.2 specification, SAML etc and we need to develop this class because sap portal doesnu2019t support this kind o features.
Regards,
Daniel Urbano

Hi,
Firstly thanks for you reply. I generate the client with wsdl2java tool as it is mentioned in AXIS2 documentation and as you specified in your blog. After I follow the steps:
Step 1 - Generating the Axis2.war
Step 2 u2013 Modify the service *.aar file
Step 3 u2013 Create the J2EE library
Step 4 u2013 Create the J2EE application wrapping the web module axis2.war
We know how to make the step 1,2 and 3 but there is a little mess in the last step. Donu2019t worry about this because we got the general idea in this document. According to the guide the main problem is to solve a classloading conflict because it only can be loaded the libraries once and you need the AXIS2 libraries for *.arr and for the axis2 engine to be able to manage this module. This problem it is solved making a J2EE library Project and putting a reference to this library in the module, applications or project, which have to use AXIS2 libraries.
We have 3 different kind of projects that we can develop according to Sap Netweaver:
J2EE Project:
·     Web Module Project: Resulting a war file.
·     Enterprise Application Project: Resulting a ear file
·     EJB Module Project: Resulting a war file.
Portal Application
·     Portal Application Project: Resulting a par file.
In any project mentioned upper we know how to deploy these with a reference to this library project that previously we deployed successfully in the portal. But the problem is when we are going to check this module running it the server give us an exception.
java.lang.LinkageError: loader constraints violated when linking javax/xml/namespace/QName class
at wpt.ConventerStub.populateAxisService(ConventerStub.java:52)
at wpt.ConventerStub.(ConventerStub.java:132)
at com.eadscasa.axis2.Axis2Converter.doContent(Axis2Converter.java:26)
This exception is because exist classes into the axis2 libraries as javax.xml.namespace.Qname that are in SAP Portal libraries into the J2ee Server (JDK 1.4). This conflict is mentioned in the blog u201C360° View on enterprise SOAu201D where Michael Koegel, the author, says that if you want that AXIS2 libraries works you will have to work around with the dependencies of libraries.
The main problem in this point it is that we donu2019t know how to resolve this dependencies and if it is possible that other module of SAP Portal wonu2019t work fine if we change the base libraries. AXIS2 has newer classes than SAP Portal and it is possible that we can break other SAP Portal functions. In this case if we can not get that AXIS2 and SAP Portal co-exist in the same server we will probably have to change our way to get the enterprise objectives.
In order to resolve these dependencies we have found a SAP Note Number: 1138545. In this note it is said that we can setup the precedence class loader in the visual admin into the deploy service. If you add your AXIS2 library at the beginning of StandardAplicationReferences variable in the deploy service, it is loaded the axis2 libraries first and it works the services but other portal functionality fails. This variable it is used to load the libraries precedence for all applications in the Server. If we could setup the class load precedence in a web module project or the system doesnu2019t take into account the server libraries for this module it will work perfectly.
If you could specify more the last point of your manual, I will appreciate it.
Regards,
Daniel Urbano

Problem with combination of LabVIEW classes (dynamic dispatch), statechart module and FPGA module

SITUATION:
- I am developing a plug-in-based software with plug-ins based on LabVIEW classes which are instanced at run-time. The actual plug-in classes are derived from generic plug-in classes that define the interfaces to the instancing VI and may provide basic functionality. This means that many of the classes' methods are dynamic dispatch and methods of child classes may even call the parent method.
- Top-level plug-ins (those directly accessed by the main VI) each have a run method that drives a plug-in-specific statechart.
- The statechart of the data acquisition plug-in class (DAQ class) calls a method of the DAQ class that reads in data from a NI FPGA card and passes it on to another component via a queue.
PROBLEM:
- At higher sampling rates, an FPGA-to-host FIFO overflow occurs after some time. When I "burden" the system just by moving a Firefox browser window over the screen, the overflow is immediately triggered. I did not have this kind of problem in an older software, where I was also reading from an FPGA FIFO, but did not make use of LabVIEW classes or statecharts.
TRIED SOLUTIONS (WITHOUT SUCCESS):
- I put the statechart into a timed loop (instead of a simple while loop) which I assigned specifically to an own core (I have a quad-core processor), while I left all the other loops of my application (there are many of them) in simple while loops. The FIFO overflow still does occur, however.
QUESTION:
- Does anybody have a hint how I could tackle this problem? What could be the cause: the dynamic dispatch methods, the DAQ statechart or just the fact that I have a large number of loops? However, I can hardly change the fact that I have dynamic dispatch methods because that's the very core of my architecture...
Any hints are greatly appreciated!
Message Edited by dlanger on 06-25-2009 04:18 AM
Message Edited by dlanger on 06-25-2009 04:19 AM
Solved!
Go to Solution.

I now changed the execution priority of all the VIs involved in reading from the FPGA FIFO to "time critical priority (highest)". This seems to improve the situation very much: so far I did not get a FIFO overflow anymore, even when I move around windows on the screen. I hope it stays like this...

Problem with setContentPane() in JFrame class

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