Swing Applet using JSObject.getWindow can not use javaFX

I have a Swing Applet that I will like to extend with some javaFX 2.0.3 abilities.
The Swing Applet uses the JSObject.getWindow method which is part of plugin.jar.
When I add javaFX I am not able to compile my application as jfxrt.jar also has a JSObject implementation, but without the getWindow method.
Is there any way I can extend my existing applet with javaFX?

The order of dependencies is probably not the issue here but rather that there are two classes with the same fully qualified name which causes problems if the signatures differ

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

below are three files that work as planned except for the call to repaint(). This is envoked when a button is hit in one applet and it should repaint another applet. I opened them up in a html file that simply runs both applets. If you could see why the repaint doesn't work I'd love to know. good luck.
//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
Container container = getContentPane();
container.setLayout( new FlowLayout() );
// initialise buttons and shit
a = new char[30];
choicebutton = new Choice();
enterLabel = new JLabel("Test");
enter = new JTextField(30);
resultLabel= new JLabel("speech label");
result = new JTextField(30);
result.setEditable(false);
// Add items to Choice Button
choicebutton.addItem("abc");
choicebutton.addItem("def");
choicebutton.addItem("ghi");
choicebutton.addItem("jkl");
pushButton = new JButton("Click to continue");
// Add new Tree from file TreeTest.java
PicW = new TreeTest();
// Add buttons to container.
container.add(resultLabel);
container.add(result);
container.add(enterLabel);
System.out.println("");
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){
// continue when action performed on pushButton
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();
public void init()
// initialising trees for backgound images and player images
BackgroundImageTree = new Tree();
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
System.out.println("inserting images into tree: ");
// inserting background images into tree structure
BackgroundImageTree.insertImage(1,snow);
// inserting players into tree structure
PlayerImageTree.insertImage(1,baby);
public void paint(Graphics g){
System.out.println("Searching for selected Image");
if((BackgroundImageTree.inorderTraversal(1)==null)&&(PlayerImageTree.inorderTraversal(1)==null)){
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;
class TreeNode {
TreeNode left;
Image data;
TreeNode right;
int value;
public TreeNode(int weight,Image picture){
left = right = null;
value = weight;
data = picture;
public void insert(int v, Image newImage){
if ( v< value){
if (left ==null)
left = new TreeNode(v,newImage);
else
left.insert(v,newImage);
else if (v>value){
if (right ==null)
right = new TreeNode(v,newImage);
else
right.insert(v, newImage);
public class Tree{
private TreeNode root;
public Tree() {
root = null;
public void insertImage(int value, Image newImage){
if (root == null)
root = new TreeNode(value,newImage);
else
root.insert(value,newImage);
// in order search of tree.
public Image inorderTraversal(int n)
return(inorderHelper(root,n));
private Image inorderHelper(TreeNode node, int n){
Image temp = null;
if (node == null)
return null;
if (node.value == n ){
return(node.data);
temp = inorderHelper(node.left,n);
if (temp == null){
temp = inorderHelper(node.right,n);
return temp;
}

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

Swing applets how?

I have no probs writing Swing Applications or AWT applets
but I dont know how to have a swing applet
I think you can install a plug in to IE so it can view Java 1.3. I am not too keen on this idea as it still means that people without the plug in will not be able to view the swing applet.
How do people without the plugin view the swing applet?
Simon

I am not too keen on this idea as it still means that
people without the plug in will not be able to view the
swing applet.That's just too bad... Didn't you know that M$ is dropping built-in "support" for Java altogether, so that you will need to download the ultra-modern plugin just like you need a plugin for movie clips, flash animations, sound, virtual reality, and other cool things?
There's more: the JRE is installed with the plugin so that the poor users will be able to run also other Java programs, not just applets. The whole world(*) will get a proper runtime environment! No more of these "how do I compile a .java to .exe" questions!
How do people without the plugin view the swing applet?Simple: convert the HTML code with the HTMLConverter app so that it will use the plugin. If a user that doesn't yet have the plugin enters your page he/she will be advised to download one...
(*) The whole world, or 'everywhere' in "write once, run everywhere" doesn't seem to incude *BSD? When will this be fixed???

Swing applet -- applet communication

I've got a swing applet having diffculties interacting with javascript. I had the same thought of adding a "normal" applet and let them do the stuff while javascript accesses the "normal" one without problems.
but there's a hook: since both applets lay in different jvm - one in plugin, the other in plain browser jvm - they don't "see" eachother.
does anyone know how to solve this problem?
thank you very much in advance.

maybe I should be more specific:
the swing applet uses the jfc plugin to load. the other one uses the "plain" browser jvm.
listing applets with appletContext.getApplets() in both applets just list themselfes. obviously because they are in 2 different jvm.
how can I access the normal one from the swing-applet and vice versa?
thank you. appreciate any help.

Memory Leak Java Plugin with Swing Applet

Hi
I experience the following problem and desperately need help on this. The Java Plugin (I use Version 1.3.1_02) seems to have a problem in printing Swing Applets.
The problem can easily be reproduced (at least with NT):
1) Start Internet Explorer or Netscape (I used 5.5/4.07)
2) Launch the following demo swing applet
http://java.sun.com/products/plugin/1.3.1_01a/demos/jfc/SwingSet2/SwingSet2Plugin.html
3) Print the applet and observe (using task manager) the memory used by the browser process (the memory used by the process will increase every time you hit the print button but never decrease unless you shut down the browser)
4) Print a couple of times (you may want to pause your print queue) and you will be able to crash your computer
This seems to be the same bug reported with 4638742. However it says "in progress" for quite some time and I was wondering if some genious might know a work around for this.
Cheers

You might want to read an article about memory leaks in Java:
http://www-106.ibm.com/developerworks/library/j-leaks/

A function can not be used in Applet.what's wrong?

Here is a function.
private String LoadFile() {
String input;
String output="sssssdsdsddf";
try{
FileReader f=new FileReader("shu.txt");
BufferedReader in = new BufferedReader(f);
while ((input = in.readLine())!= null){output=output+input;}
in.close();
}catch(IOException e) {
System.err.println("Exception caught: " + e.getMessage());
return output;
It can be used in Java Application,and work well.but can not be used in Applet,it does not work.what's wrong?

http://www.javaworld.com/javaworld/jw-12-2000/jw-1215-security.html#sidebar1

A function can not be used in Applet.what' wrong?

Here is a function.
          private String LoadFile() {
String input;
          String output="sssssdsdsddf";
          try{
          FileReader f=new FileReader("shu.txt");
BufferedReader in = new BufferedReader(f);
while ((input = in.readLine())!= null){output=output+input;}
          in.close();
          }catch(IOException e) {
               System.err.println("Exception caught: " + e.getMessage());
return output;
It can be used in Java Application,and work well.but can not be used in Applet,it does not work.what's wrong?

Don't you think it would be a bit of a security risk if any applet you downloaded from the web (unknowingly) could read/write to your file system....
Applets have strict security applied to them, and file i/o is one of the restrictions. There are ways around it, but for the moment I'd suggest you build a bridge and get over it.
Cheers,
Radish21

Html file to run an Applet using swings in 1.4.1 or 1.3.1

Can anyone send me an html document to launch the applet in a browser. I have very basic html, but I need one that uses the appropriate plug-in and that has parameters such as height, width, etc. My applet uses tabbed panes, dialog boxes and comboboxes. It works well with appletviewer, but does not work in IE or Netscape.
Thank you for your help
here is what I am using which does does show anything but a grey screen
<HTML>
<HEAD>
<TITLE>
CIS 602 Semister Project
</TITLE>
</HEAD>
<BODY>
<BR>
<H3>
<CENTER>
Swing
</CENTER>
</H3>
<H3>
<BR><BR>
<P><H3>
<CENTER>
<BR><BR>
<P><h2>
Structured Problem Solving Strategy
</h2>
<blockquote>


<SCRIPT LANGUAGE="JavaScript"></SCRIPT>
<COMMENT><SCRIPT LANGUAGE="JavaScript1.1"></SCRIPT></COMMENT>
<SCRIPT LANGUAGE="JavaScript"></SCRIPT>
<APPLET CODE = "semiclient.class" WIDTH = "570" HEIGHT = "500" ></XMP>
<PARAM NAME = CODE VALUE = "semiclient.class" >
<PARAM NAME="type" VALUE="application/x-java-applet;version=1.4.2">
</APPLET>
</NOEMBED></EMBED></OBJECT>


</Center>
<BLOCKQUOTE><PRE>
</PRE></BLOCKQUOTE>
</H3>
<BLOCKQUOTE><PRE>
</PRE></BLOCKQUOTE>
</H3>
</BODY></HTML>

Try this:
<HTML>
<HEAD>
<TITLE>CIS 602 Semister Project</TITLE>
</HEAD>
<BODY>
<CENTER><H3>Swing</H3></CENTER><CENTER><H2>Structured Problem Solving Strategy</H2></CENTER>
        <OBJECT classid="clsid:8AD9C840-044E-11D1-B3E9-00805F499D93"
            width="750"
            height="575"
            align="baseline"
            codebase="http://java.sun.com/products/plugin/autodl/jinstall-1_4_0-win.cab">
            <PARAM NAME="code"       VALUE="full.qualified.ClassName">
            <PARAM NAME="codebase"   VALUE="path/to/your/class/files/or/archive/">
            <PARAM NAME="archive"    VALUE="nameOfJarWhichContainsClassFiles.jar">
            <PARAM NAME="type"       VALUE="application/x-java-applet;version=1.4">
            <PARAM NAME="scriptable" VALUE="false">
            <COMMENT>
                <EMBED type="application/x-java-applet;version=1.4"
                    width="750"
                    height="575"
                    align="baseline"
                    code="full.qualified.ClassName"
                    codebase="path/to/your/class/files/or/archive/"
                    archive="nameOfJarWhichContainsClassFiles.jar"
                    pluginspage="http://java.sun.com/products/plugin/1.4/plugin-install.html">
                    <NOEMBED>
                        No Java 2 SDK, Standard Edition v 1.4 support for APPLET!!
                    </noembed>
                </embed>
            </COMMENT>
        </OBJECT>
</BODY>
</HTML>

Using Swing applet to write data to file on SERVER

Hello,
I'm in the process of writing an applet using Swing (SDK v1.4.2). Here's the deal. The JApplet calls a JPanel, which will be used by customers on my site to enter data. I'm adding a <Save> button to the "form" which is supposed to write data to a file on the server (in order to preserve the customer's preferences).
Please note that I am NOT attempting to write data to the customer's hard disk. That requires digital certificates, etc. which I am trying to avoid for now.
Instead, I am using the URL class to access the file:
URL page = new URL("http://www.whatever.com/mycustomers/preferences.txt")
I then use the URLConnection class to establish the connection:
URLConnection conn = this.page.openConnection();
conn.setDoInput(true);
conn.setDoOutput(true);
conn.connect();
etc...
I've created a text file (preferences.txt) on my web site. Using the classes InputStreamReader, BufferedStreamReader, and StringBuffer, I can successfully read the file into a JOptionPane in my applet.
The problem comes when I try to write data TO this file. I know the file exists because the applet can read it. I've set the permissions on the file to 666. I've got all of the appropriate syntax within a try statment that catches an IOException. I also have JOptionPanes all over the place to let me know where the program is. I've tried different combinations of output streams like BufferedWriter, BufferedOutputStream, StringWriter, but the file does not get updated. When the applet runs, it does not throw any exceptions, not even when I change the URL from "HTTP://www.whatever.com/prefs.txt" to "HTTP:/www.whatever.com/prefs.txt" (only one slash on HTTP, shouldn't I get a MalformedURLException?)
I apologize for all the background, but I thought you might need it. The bottom line is:
1) Can an applet write to a file on a remote server (not local hard disk)?
2) If so, what (if any) caveats are there?
3) Is there a way to check for file existence or be able to create a new file?
4) I'm using the HTTP protocol - is there some restriction that prevents an applet from writing to a file using that protocol? If so, is there a workaround?
5) Assuming that creating/writing a file using the method I've described is possible, what would be the appropriate output streams to use? (Currently, I'm using OutputStreamWriter with BufferedWriter).
I've been struggling with this for a while. Any help/suggestions would be appreciated.
Thanks
P.S. I also posted this message on the Applet development forum, but I've received no response as of yet.

Http servers support PUT as a mechanism to upload data to a specified URL. Get on the other hand which is what most people are familiar with is how you retrieve that data. The basic URLConnection is an abstraction of the Http connection which can be used for GET and POST operations by default based on doInput(true|false).. If you which to use any of the http methods other than GET|POST you will have to cast the URLConnection to HttpURLConnection so you can gain access to the specific Http functionaility that could not be abstracted.
Since you are using a hosting service the chances are that you won't be able to use HTTP PUT on their server. Most servers do not support HTTP PUT without configuring them todo so. Now Apache allows localized config through the .htacess file. It might be possible (keep in mind I am not an apache expert) to configure a particular directory to allow HTTP PUT using this .htacess file it may not be possible. You will have to consult the Apache web server documentation for that answer.
But regardless you can use the HttpURLConnection and the PUT method to send data from your applet to the server. In fact that is the preferred way to do this. If you can not configure your web server to support that method then you will have to develop a Servlet to do it. A servlet has several methods such as doGet(), doPost(), and doPut(). You would override the doPut() method get the URI path create a file and a FileOutputStream to that file, get from the request the inputstream, possibly skip the http headers, and then write byte for byte the incoming data to your OutputStream until you reach the end at which point you would close the OutputStream and send an Http Response of some sort. Typically in HTTP it would be 200 OK plus some web content. You content can be empty so long as your applet recognizes that is what it should expect...
And away you go...

Java applet using the Swing API

write a Java applet using the Swing API to manage a PC repair shop. When a PC is brought in for repair, a member of staff will use this applet to log it into the system as a repair job. They will also be able to use the applet to manage the job e.g. allocate a person to carry out the repair and enter costs.
You must not use a tool such as JBuilder to generate Java code. If you use code from elsewhere e.g. a text book, you must highlight the code and state the reference clearly and include a photocopy of the relevant pages from the text book or other source.
You should hard-code some initial data into your applet. You should not store any data in a file or database.
Level of functionality you should attempt to implement:
Level 1 � Your applet should:
a.     As a minimum, your program should store (in memory) at least 10 repair jobs. For each repair job, you need to store:
�     The name and phone number of the customer bringing the PC in for repair;
�     A brief textual description of the problem;
�     Whether the PC is under warranty or not.
b.     Your program must allocate and display a unique number for the job once it is accepted.
c.     The user must be able to view the details of jobs. They should be able to select either:
�     All the jobs in the system; or
�     Jobs being carried out under warranty.
Level 2 � Your applet must meet the requirements for level 1. In addition it should:
a.     You should carry out appropriate validation checks on input data e.g. the phone number contains all digits.
b.     System should cope with an unlimited number of jobs.
c.     The user should be able to select a job and then allocate a repairer to that job.
d.     The user should be able to display a list of jobs for each repairer.
Level 3 - Your applet must meet the requirements for level 1 and 2. In addition it should allow the user to:
a.     Select a job and input the cost of repair for:
�     the number of hours labour;
�     parts.
b.     Select a job and present the user with a cost for the labour (hard code an hourly labour cost) and parts, plus a total for that job. For jobs under warranty the total will be zero, however the cost of labour and parts will be shown.
c.     Be able to inform the business of the total expected income from the all the jobs in the system that are not under warranty.
Level 4 � Your applet must meet the requirements for level 1 to 3. In addition:
a.     The user should be able to enter a job priority which can be identified as high, medium or low.
b.     Each repairer should be able to view a list of their jobs in order of priority.

Done, what next ?
Noah

How to use Flash buttons/animation in a Swing/Applet?

Hello,
I want to use flash button as like as JButton that we use in Swing/ Applet. How can I do So?
Please help me.
Thanks-

[http://java.sun.com/docs/books/tutorial/uiswing/misc/timer.html]
Or maybe just...
import java.awt.*;
import java.net.*;
import javax.swing.*;
public class Blinky {
    public static void main(String[] args) {
        EventQueue.invokeLater(new Runnable(){
            public void run() {
                URL url = null;
                try {
                    url = new URL("http://www.gifanimations.com/GA/image/animations/bodyparts/eyes/eye-01.gif");
                } catch (MalformedURLException e) {
                    throw new RuntimeException(e);
                JFrame f = new JFrame("Blinky");
                f.getContentPane().add(new JButton(new ImageIcon(url)));
                f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
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Please give me an exemple of an applet using a swing object.

Please give me an exemple of an applet using a swing object.thank you.

My problen is that the swing object do not appear in
my applet. They appear only if i invoque the repaint
methode.use JApplet, since awt components are heavyweight, and swing components are lightwieght, then your swing components get over painted with aplets background or something.
anyhow, in your applet you may create JFrame, that would be swing component and if you set it visible, then it will be even visible.
they say that mixing swing and awt is not good idea, especially when you don't know what you're doing (which might be true in your case)
so try to migrate your app from AWT based stuff to SWING based stuff, or write your own AWT components that do the job whih you needed swing component for at the first place.
but if you need to mix awt and swing, then i thing that you should not paint the fole area of applet in applets paint method -- but here i'm not sure, never mixed 'em.
so you might try to create an applet which paint() method you leave empty and to which you add some JComponent*.
and see what happens, maybe this JComponent will be visible.
* -- JComponent is most likely just gray, you might want to add some subclass of it -- JButton, JTextField, JSomethingElse.

Using swing applet in IE

Dear,
Is there any way to use swing applet in IE.
Thanks,

If you are trying to make your code workable with Microsoft's VM, then I'd say you are looking for trouble. That VM's version is 1.1.4, if I'm not mistaken.
Better stick to the JRE 1.4 with the plugin.

Can you please tell me how can i change the parameter of Applet using Aspec

Respect Members
Can we apply Aspectwerkz on Applet? In our project we have to
change the method parameters before its execution(Around Advice) , can we do this in applet using Aspectwerkz?
Can you please tell me how can i change the parameter of Applet using Aspectwerkz or AspectJ ?
I did it by for Java Application using the AspectJ And Aspectwerkz But not able to do for Applet.
For Applet I Am setting the parameter in JAVA plug in for Aspectwerkz e.g. -Xdebug -Xrunaspectwerkz -Xbootclasspath & path for xml file in which pointcut is defined.
If you any Friend working on it or any author who might be helpfull for me please Forward this mail to him/her
THANKs in Advance
[email protected]

hello rodale, what you're seeing is probably a side effect of firefox not being able to save certain preferences into its profile folder.
go to ''firefox > help > troubleshooting information'', click on ''profile folder/show folder'' and close all firefox windows afterwards. a windows explorer window should open up - in there delete the file named '''user.js'''.
in case this didn't solve the issue yet please also refer to [[How to fix preferences that won't save]].

Memory leak with 1.6.0_07 in applet using Swing

Java Plug-in 1.6.0_07
Using JRE version 1.6.0_07 Java HotSpot(TM) Client VM
Windows XP - SP2
I have a commercial application that has developed a memory leak with the introduction of the latest plugin. The applets chew up memory and eventually freeze. They did not before. Using jvisualm I see a build up of native arrays, primarily int[][] and char[]. I'm still investigating. Anyone have a similar experience?
The Applet uses a swing interface, uses buffered images and swing timers, and regularly performs http connections to the server which result in actions via the SwingUtil.invokeLater() method.

I am Using Internet Explorer Browser Version 6.0.Huge security hole.
Its not throwing Error / Exception Wrap a try/catch at the highest level possible.
Catch 'Throwable'. And log/display it somewhere.

Swing Applet using JSObject.getWindow can not use javaFX

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