Problem to repaint my applet

Hi,
I am developping an applet that owns several interface. So I have an interface Identificator and another Registrator.
During the init() phase of my applet I create my Panel object Identificator, and I display it.
When I click on the button register (contained in Identificator), I create my new Panel Object Rgistrator, and I try to display it.
First I remove the Identificator Panel of the Applet's Container and I add the Registrator Panel to it.
After that I lauch the method repaint().
After that nothing is displayed, but if I resize my Browser Window, my interface Registrator is displayed!!!!!!!!
Is there someone that could help me...
Thank you very much...

maybe the setVisible(true) operator may work,. I know that when I forget this in a JFrame my frame won't show.
Greetings,.
Arnoud

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Repaint() an applet from a swing applet, why does this code not work?

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//speech1
import java.awt.*;
import java.applet.Applet;
import java.awt.event.*;
//java extension packages
import javax.swing.*;
public class speechapp1 extends JApplet implements ActionListener{
// setting up Buttons and Drop down menus
char a[];
Choice choicebutton;
JLabel resultLabel;
JTextField result;
JLabel enterLabel;
JTextField enter;
JButton pushButton;
TreeTest PicW;
// setting up applets G.U.I
public void init(){
// Get content pane and set it's layout to FlowLayout
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a = new char[30];
choicebutton = new Choice();
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enter = new JTextField(30);
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choicebutton.addItem("def");
choicebutton.addItem("ghi");
choicebutton.addItem("jkl");
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container.add(result);
container.add(enterLabel);
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container.add(choicebutton);
System.out.println("");
container.add(pushButton);
pushButton.addActionListener(this);
//choicebutton.addActionListener( this );
// Set the text in result;
result.setText("Hello");
//public void paint(Graphics gg){
// result.setText("Hello");
public void actionPerformed(ActionEvent event){
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String searchKey = event.getActionCommand();
System.out.println("");
if (choicebutton.getSelectedItem().equals("abc"))
PicW.getPicWeight(1);
if (choicebutton.getSelectedItem().equals("def"))
PicW.getPicWeight(2);
if (choicebutton.getSelectedItem().equals("ghi"))
PicW.getPicWeight(3);
if (choicebutton.getSelectedItem().equals("jkl"))
PicW.getPicWeight(4);
System.out.println("repainting from actionPerformed method()");
PicW.repaint();
import java.applet.Applet;
import java.awt.*;
import java.util.*;
public class TreeTest extends Applet{
Tree BackgroundImageTree;
Tree PlayerImageTree;
Image snow,baby;
int weight;
public void getPicWeight(int w){
weight = w;
System.out.println("the new weight has been set at: "+weight);
this.repaint();
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// initialising trees for backgound images and player images
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PlayerImageTree = new Tree();
// initialising images and correcting size of images to correctly fit the screen
snow = getImage(getDocumentBase(),"snow.gif");
baby = getImage(getDocumentBase(),"baby.gif");
// inserting images into correct tree structure
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// inserting background images into tree structure
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// inserting players into tree structure
PlayerImageTree.insertImage(1,baby);
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System.out.println("Searching for selected Image");
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System.out.println("There is no tree with the selected value in the trees");
}else{
g.drawImage(BackgroundImageTree.inorderTraversal(1),1,3,this);
//g.drawImage(PlayerImageTree.inorderTraversal(1),55,150,this);
import java.awt.*;
import java.applet.Applet;
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TreeNode left;
Image data;
TreeNode right;
int value;
public TreeNode(int weight,Image picture){
left = right = null;
value = weight;
data = picture;
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if ( v< value){
if (left ==null)
left = new TreeNode(v,newImage);
else
left.insert(v,newImage);
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else
right.insert(v, newImage);
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private TreeNode root;
public Tree() {
root = null;
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if (root == null)
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if (node == null)
return null;
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}

I can fix your problems
1. You get an error here because you can only invoke the superclass's constructor in the subclass's constructor. It looks like that's what you're trying to do, but you're not doing it right. Constructors don't return any value (actually they do, but it's implied, so you don't need the void that you've got in your code)
2. I'm not sure, but I think your call to show might be wrong. Move the setsize and setvisible calls to outside of the constructor

Problem with GUI in applet

Hai to all,
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import javax.swing .*;
import java.awt.*;
import java.awt.event.*;
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import java.util.*;
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How can i achive that pls help .

Just to make the code readable...
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import java.awt.*;
import java.awt.event.*;
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JButton jb;
JTextArea text;
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text=new JTextArea(5,20);
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import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
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getContentPane().add(a);
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a.text.append(aaa);
a.text.revalidate();
getContentPane().remove(a);
resize(500,500);
}).start();
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JButton jbt;
JTextArea jta;
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getContentPane().setLayout(new FlowLayout());
jbt=new JButton("Click me");
jbt.addActionListener(this);
getContentPane().add(jbt);
jta=new JTextArea(5,20);
getContentPane().add(jta);
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Enumeration e = getAppletContext().getApplets();
Applet applets = null;
while(e.hasMoreElements())
applets=(Applet)e.nextElement();
if ( applets instanceof B_b)
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((B_b)applets).text_appendText(jta.getText());
((B_b)applets).remove());
((B_b)applets).getContentPane().add(D_d);
}

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Hi piotrek1130sw,
From what you have described, I think the best approach would be to restore the original IDT driver, restart the computer, test that driver, then install the driver update, and test the outcome of installing the newest driver.
Use the following link for instructions to recovery the ITD driver using Recovery Manager. Restoring applications and drivers.
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If installing the newest driver causes the issue to occur but the recovered driver worked, I suggest recovering again.
If neither driver works I will gladly follow up and provide any assistance I can.
Please let me know the outcome.
Please click the Thumbs up icon below to thank me for responding.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Please click “Accept as Solution” if you feel my post solved your issue, it will help others find the solution.
Sunshyn2005 - I work on behalf of HP

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modified your code little
don't draw in keyPressed
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Thanks. I´ll try with your tips. But if i put all the dependences in archive I get this error.
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g:   liberación de recursos
h:   presentar este mensaje de ayuda
l:   volcar lista del cargador de clases
m:   imprimir sintaxis de memoria
o:   activar registro
q:   ocultar consola
r:   recargar configuración de norma
s:   volcar propiedades del sistema y de despliegue
t:   volcar lista de subprocesos
v:   volcar pila de subprocesos
x:   borrar antememoria del cargador de clases
0-5: establecer nivel de rastreo en <n>
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Hey thanks. I wasn't able to get it to work with that sample but I did find this very similar code that does allow javascript to call JFileChooser in an applets public method.
java.security.AccessController.doPrivileged(
new java.security.PrivilegedAction()
public Object run(){
//do your special code here
return null; //return whatever you want
It seems a bit tempermental in that if you don't select a file quickly, it will hang the browser....no perfect solution but I'm going in the right direction.
Thanks,
Scott

Java.lang.StackOverflowError problem, drawing images in applet :(

     * Paints the applet
    @Override
    public void paint(Graphics g)
        if(running && levelOne)
        g.setColor(Color.MAGENTA);
        g.drawString("HP Left: " + player.getHP(), 100, 10);
//      g.drawString("Time Left: " + timer.getTime(), 170, 10);
        g.drawString("Score: " + player.getScore(), 30, 10);
        g.drawString("Required Score To Next Level: " + player.getScore() + "/3000", 100, 190);
        g.drawString("Level: 1", 30, 190);
        g.fillOval(x_pos - radius, y_pos - radius, 2 * radius, 2 * radius);
        if(start && storyStarted)
            try
                update(g);
                paintStory();
            catch(java.lang.StackOverflowError sofe)
                System.exit(0);
        else if(start)
            g.drawImage(image, 0, 0, this);
            g.drawImage(gun, 200, 400, this);
     * Updates the paint() method and the applet
    @Override
    public void update(Graphics g)
        if(dbImage == null)
            dbImage = createImage(this.getWidth(), this.getHeight());
            dbG = dbImage.getGraphics();
        dbG.setColor(getBackground());
        dbG.fillRect(0, 0, this.getWidth(), this.getHeight());
        dbG.setColor(getForeground());
        paint(dbG);
        g.drawImage(dbImage, 0, 0, this);
    public void paintStory()
        getGraphics().drawImage(story1, 0, 0, this);
    }I know that my problem appears somewhere in the above written code, so if you would take a look, and try to help me fixing my problem! :D

Vimsie wrote:
I get a StackOverflowError, but the image isn't flickering!Err, the image is not flickering because there are no repaints happening anymore due to the StackOverflowError. This is hardly an argument for your approach.
However, I have to admit I don't know how to solve your flickering problem. I've never used AWT but always SWING (but then I don't do applets).
Maybe google can help?

Problem with threads within applet

Hello,
I got an applet, inside this applet I have a singleton, inside this singleton I have a thread.
this thread is running in endless loop.
he is doing something and go to sleep on and on.
the problem is,
when I refresh my IE6 browser I see more than 1 thread.
for debug matter, I did the following things:
inside the thread, sysout every time he goes to sleep.
sysout in the singleton constructor.
sysout in the singleton destructor.
the output goes like this:
when refresh the page, the singleton constructor loading but not every refresh, sometimes I see the constructor output and sometimes I dont.
The thread inside the singleton is giving me the same output, sometime I see more than one thread at a time and sometimes I dont.
The destructor never works (no output there).
I don't understand what is going on.
someone can please shed some light?
thanks.
btw. I am working with JRE 1.1
this is very old and big applet and I can't convert it to something new.

Ooops. sorry!
I did.
     public void start() {
     public void stop() {
     public void destroy() {
          try {
               resetAll();
               Configuration.closeConnection();
               QuoteItem.closeConnection();
          } finally {
               try {
                    super.finalize();
               } catch (Throwable e) {
                    e.printStackTrace();
     }

Problem with repaint() in JPanel

Hi,
This is the problem: I cyclically call the repaint()-method but there is no effect of it.
When does it appear: The problem occurs by calling the repaint()-method of a JPanel -class.
This is what i am doing: The repaint() is called from a different class which is my GUI. I do this call in an endless loop which is done within a Thread.
I tried to add a KeyListener to the JPanel-class and there I called the repaint()-method when i press a Key. Then the Panel is repainted.
so I implemented a "callRepaint"-method in the JPanel-class that does nothing else than call repaint() (just like the keyPressed()-method does). But when i cyclically call this "callRepaint"-method from my GUI nothing happens.
Now a few codedetails:
// JPanel-class contains:
int i = 0;
public void callRepaint(){
                repaint();
public void paintComponent(Graphics g){
        super.paintComponent(g);
        g.drawLine(i++,0,200,200);
public void keyPressed(KeyEvent e) {
        repaint();                       // This is working
//GUI-class contains:
// This method is called cyclically
public void draw() {
              lnkJPanelclass.repaint();             // This calling didn't work
              // lnkJPanelclass.callRepaint(); // This calling didn't work
Thanks for your advices in advance!
Cheers spike

@ARafique:
This works fine:
import java.awt.*;
import java.awt.event.*;
import java.util.Date;
import javax.swing.*;
public class Test extends JFrame implements ActionListener{
    private JTextField label;
    private Timer timer;
    private Container cont;
    public Test() {
        label = new JTextField("",0);
        timer = new Timer(1000,this);
        cont = getContentPane();
        cont.add(label);
        setSize(250,70);
        setDefaultCloseOperation(3);
        setVisible(true);
        timer.start();
    public void actionPerformed(ActionEvent e){
        label.setText(new Date(System.currentTimeMillis()).toString());
    public static void main(String[] args){
        javax.swing.SwingUtilities.invokeLater(new Runnable() {
            public void run() {
                new Test();
}no repaint()/revalidate() needed

Problem in loading an applet using JRE 1.5

Hi,
I have an applet which is working fine under JRE 1.4, but the same applet failing to load by using JRE 1.5
Problem Description:
1. The images in the applet fails to load using JRE 1.5
2. The Username and Password text box are also failing to initialize.
Can anyone help me out in this.
Is there any code changes required ?

I wonder if you have the same problem as me... Maybe we can find a solution for us both, no need for me to open a new thread for this topic then...
I wrote an applet using Swing and compiled it using JavaSDK 1.4.x. I also installed the 1.4.x JRE for both of my test browsers. In Mozilla 1.1 the applet displays properly all the time. In IE6 SP1 it sometimes works as intended but sometimes the applet simply stops working, as per my Java Console somewhere after invoking the "start" method. Parts of the applet simply become gray and when I resize it - I have a JFrame in my applet - the whole JFrame becomes gray and does not respond to input nor it redraws itself. Shutting down IE does not close the JFrame(although the java console reports normal program termination and cleanup) and the only way to close it is through the task manager. I am using Windows 98SE btw.
Does it sound similiar to your problem? It happens ONLY with IE, not with Mozilla. Anybody has an idea on what it could be? I doubt there's an error in my code...

Problem in repaint

I drawn some rectangles.If one rectangle was clicked,the rectangles below it should move down..but for me,its not repainting.the old location as well as the new location was there when i click the rectangle...
import javax.swing.JApplet;
* To change this template, choose Tools | Templates
* and open the template in the editor.
import java.awt.event.MouseEvent;
import javax.swing.*;
import java.awt.*;
import java.awt.Graphics;
import java.awt.Rectangle;
import java.awt.Rectangle;
import java.awt.event.MouseListener;
import java.util.ArrayList;
* @author 8563
public class TestTree extends JApplet
    @Override
    public void init()
        Container con = getContentPane();
        con.setLayout(new BorderLayout());
        setPreferredSize(new Dimension(300, 300));
        JScrollPane scroll = new JScrollPane();
        getContentPane().add(scroll, BorderLayout.CENTER);
        scroll.setViewportView(new ImagePanel());
    private class ImagePanel extends JPanel implements MouseListener {
        ImagePanel image;
        Rectangle rext = new Rectangle(40, 40, 30, 15);
        int[] x = {75, 95, 115, 130};
        int[] width = {15, 15, 15, 15};
        boolean selected1 = false;
        int count;
        Rectangle [] rects;
        Rectangle [] rectangles;
        ArrayList<Rectangle> hlp;
        public ImagePanel()
            prepareData();
            this.addMouseListener(this);
        @Override
        protected void paintComponent(Graphics g)
            Graphics2D g2 = (Graphics2D) g;
            g2.draw(rext);
            drawRect(g2);
        public void prepareData()
            int x = 75;
            int y = 85;
            int w = 20;
            int h = 15;
            hlp = new ArrayList<Rectangle>();
            for (int i = 0; i < 4; i++) {
                hlp.add(new Rectangle(x, y, w, h));
                y += 25;
            rectangles = hlp.toArray(new Rectangle[hlp.size()]);
       public void drawRect(Graphics g)
            Graphics2D g2 = (Graphics2D) g;
            for (Rectangle r : rectangles)
                g2.draw(r);
                //repaint();
        public void mouseClicked(MouseEvent e)
            Point mse_clk = e.getPoint();
            int count_incr = count+1;
            int y = 150;
            for(int i=count_incr;i<rectangles.length;i++)
                if(selected1)
                    rectangles.setLocation(rectangles[i].x,rectangles[i].y+20);
// repaint();
repaint();
public void mousePressed(MouseEvent e)
Point pres_point = e.getPoint();
for (int i=0;i<rectangles.length;i++)
if(rectangles[i].contains(pres_point))
selected1 = true;
count = i;
break;
public void mouseReleased(MouseEvent e)
public void mouseEntered(MouseEvent e)
public void mouseExited(MouseEvent e)
public static void main(String[] args) {
JApplet applet = new TestTree();
JFrame f = new JFrame();
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
f.add(applet);
f.setSize(400, 400);
f.setLocationRelativeTo(null);
applet.init();
f.setVisible(true);

        @Override
        protected void paintComponent(Graphics g)
            // paint the background..
            super.paintComponent(g);
            Graphics2D g2 = (Graphics2D) g;
            g2.draw(rext);
            drawRect(g2);
        }

Problem while loading the applet across SSL in IE 5.0 & NS 6.0

Hi
Can any one of u guys solve my problem????
I m trying to load an applet thru https protocol in both the browsers( IE 5.0 and Netscape 6.0). I am having a jar file which contains the applet class files and some helper files for the applet.When i m accessing the image URL (in the html file for the applet) thru https protocol itz working fine on both the browsers. But when i try to access codebase thru https i m getting different errors on both the browsers. Errors r as follows.
Exception in IE 5.0
java.net.ConnectException: HTTPS response=404
at
sun.plugin.protocol.https.BrowserHttpsInputStream.openStream(Native
Method)
at
sun.plugin.protocol.https.BrowserHttpsInputStream.<init>(Unknown
Source)
at
sun.plugin.protocol.https.BrowserHttpsURLConnection.getInputStream(Unknown
Source)
at sun.plugin.cachescheme.PluginURLConnection.downLoadFile(Unknown
Source)
at
sun.plugin.cachescheme.PluginJarCacheHandler.downloadJarFileToCache(Unknown
Source)
at
sun.plugin.cachescheme.PluginJarCacheHandler.cacheHandler(Unknown
Source)
at
sun.plugin.cachescheme.PluginJarCacheHandler.getJarFilesPath(Unknown
Source)
at sun.plugin.AppletViewer.loadJarFiles(Unknown Source)
at sun.applet.AppletPanel.runLoader(Unknown Source)
at sun.applet.AppletPanel.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
Exception in Netscape 6.0
java.lang.ClassFormatError: package1/package2/package3/TiffViewer (Bad
magic number)
at java.lang.ClassLoader.defineClass0(Native Method)
at java.lang.ClassLoader.defineClass(Unknown Source)
at java.security.SecureClassLoader.defineClass(Unknown Source)
at sun.applet.AppletClassLoader.findClass(Unknown Source)
at sun.plugin.security.PluginClassLoader.access$201(Unknown
Source)
at sun.plugin.security.PluginClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at sun.plugin.security.PluginClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.applet.AppletClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.applet.AppletClassLoader.loadCode(Unknown Source)
at sun.applet.AppletPanel.createApplet(Unknown Source)
at sun.plugin.AppletViewer.createApplet(Unknown Source)
at sun.applet.AppletPanel.runLoader(Unknown Source)
at sun.applet.AppletPanel.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
Plz help me out if any one of u guys have came across such type of problem. Its very very urgent as well as critical. Any help / suggestion will highly be appreciated
tks in advance
Soniya

Hi..
I m also facing the same problem as described above. I have checked up the path for the class files mentioned in the "code" param in the html file.I also tested with the sample program but could not succed in getting the result.Both the browsers give different error messages as mentioned in the query posted by soniya1.I would be thankful if u can kindly throw some light on this
if u have some sample code u may kindly drop it to the following mail id
[email protected]
hope to hear from u soon
tx in advance
R.Lakshmi

Problem to repaint my applet

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