Applet in a .JAR

I have an applet in a jar to sign it for that applet access local files; but i don't know how to call the applet(in the .jar) from the jsp.
Thanks in Advanced.

Use the <jsp:plugin ...> directive. It will be explained in more detail in the JSP 1.2 spec.
Anthony.

Similar Messages

Loading applet for a jar within an ear

Hi,
Apologies if my question sounds ignorant, this is the first time i'm playing with applets.
I'm trying to load an applet from a JAR (applet.jar) which contains all the files specific to the applet. The applet.jar resides within an ear (application.ear) which is deployed on JBoss.
The applet related stuff is in the package com.dms.applet (which makes up the applet.jar)
My index.html resides in a war file (webapp.war), which essentially contains a bunch of servlets. Index.html is a two frame page, which tries to load the applet in one frame and a servlet in another (servlets work fine).
My <APPLET> tag for the frame in which the applet is displayed (is another html file - applet.html) looks something like this:
<html><body>
<APPLET
     code="com.dms.applet.NavigationApplet.class"
     codebase=./"
     archive="applet.jar, application.ear"
     width=200
     height=500
>
</APPLET></body></html>
however, the applet always fails to load, i get the following exception when i open the java console:
java.lang.ClassNotFoundException:
com.dms.applet.NavigationApplet.class
     at sun.applet.AppletClassLoader.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)
Caused by: java.io.IOException: open HTTP connection failed.
     at sun.applet.AppletClassLoader.getBytes(Unknown Source)
     at sun.applet.AppletClassLoader.access$100(Unknown Source)
     at sun.applet.AppletClassLoader$1.run(Unknown Source)
     at java.security.AccessController.doPrivileged(Native Method)
     ... 10 more
load: class com.dms.applet.NavigationApplet.class not found.
java.lang.ClassNotFoundException:
com.dms.applet.NavigationApplet.class
     at sun.applet.AppletClassLoader.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)
Caused by: java.io.IOException: open HTTP connection failed.
     at sun.applet.AppletClassLoader.getBytes(Unknown Source)
     at sun.applet.AppletClassLoader.access$100(Unknown Source)
     at sun.applet.AppletClassLoader$1.run(Unknown Source)
     at java.security.AccessController.doPrivileged(Native Method)
     ... 10 more
It seems evident that the applet class loader can't find my applet.class and hence can't load it. I guess that its something wrong with my <APPLET> tag, but can't quite seem to get my finger on it. Do i need to explicitly tell the class loader to look for it in the applet.jar which is in the applicatin.ear?
Any help would be very much appreciated.
Thanks in advance
EnterpriseJavaBones

Hi,
I managed to fix this problem. For those who mite come across the same issue in the future, this is how i did it.
I put the applets code in the war file under an applet dir. That the the index.html is in the root (of the war dir) and the applets code is in a /applet dir.
Hence the codebase simply reads, codebase="applet/"
Cheers
EnterpriseJavaBones

Class not found in applet using 2 jar files

I have an applet which has been working for years as a stand alone or connecting directly to a derby database on my home server. I have just changed it to connect to MySQL on my ISP server via AJAX and PHP.
I am now getting a class not found error in my browser, probably because I'm stuffing up the class path.
The HTML I am using to call the applet is:
<applet code="AMJApp.class"
codebase="http://www.interactived.com/JMTalpha"
archive="AMJ014.jar,plugin.jar"
width="500"height="500"
MAYSCRIPT style="border-width:0;"
name="jsap" id="jsap"></applet>The AMJ014.jar contains the applet and supporting class files.
The error message is strange to me because it refers to a class I noticed on another web page but which has nothing to do with my applet. Anyway, the message in full is:
load: class NervousText.class not found.
java.lang.ClassNotFoundException: NervousText.class
     at sun.plugin2.applet.Applet2ClassLoader.findClass(Unknown Source)
     at sun.plugin2.applet.Plugin2ClassLoader.loadClass0(Unknown Source)
     at sun.plugin2.applet.Plugin2ClassLoader.loadClass(Unknown Source)
     at sun.plugin2.applet.Plugin2ClassLoader.loadClass(Unknown Source)
     at java.lang.ClassLoader.loadClass(Unknown Source)
     at sun.plugin2.applet.Plugin2ClassLoader.loadCode(Unknown Source)
     at sun.plugin2.applet.Plugin2Manager.createApplet(Unknown Source)
     at sun.plugin2.applet.Plugin2Manager$AppletExecutionRunnable.run(Unknown Source)
     at java.lang.Thread.run(Unknown Source)
Exception: java.lang.ClassNotFoundException: NervousText.class
java.lang.UnsupportedClassVersionError: AMJApp : Unsupported major.minor version 51.0
     at java.lang.ClassLoader.defineClass1(Native Method)
     at java.lang.ClassLoader.defineClassCond(Unknown Source)
     at java.lang.ClassLoader.defineClass(Unknown Source)
     at java.security.SecureClassLoader.defineClass(Unknown Source)
     at java.net.URLClassLoader.defineClass(Unknown Source)
     at java.net.URLClassLoader.defineClass(Unknown Source)
     at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
     at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
     at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
     at java.lang.reflect.Method.invoke(Unknown Source)
     at sun.plugin2.applet.Plugin2ClassLoader.defineClassHelper(Unknown Source)
     at sun.plugin2.applet.Plugin2ClassLoader.access$100(Unknown Source)
     at sun.plugin2.applet.Plugin2ClassLoader$2.run(Unknown Source)
     at java.security.AccessController.doPrivileged(Native Method)
     at sun.plugin2.applet.Plugin2ClassLoader.findClassHelper(Unknown Source)
     at sun.plugin2.applet.Applet2ClassLoader.findClass(Unknown Source)
     at sun.plugin2.applet.Plugin2ClassLoader.loadClass0(Unknown Source)
     at sun.plugin2.applet.Plugin2ClassLoader.loadClass(Unknown Source)
     at sun.plugin2.applet.Plugin2ClassLoader.loadClass(Unknown Source)
     at java.lang.ClassLoader.loadClass(Unknown Source)
     at sun.plugin2.applet.Plugin2ClassLoader.loadCode(Unknown Source)
     at sun.plugin2.applet.Plugin2Manager.createApplet(Unknown Source)
     at sun.plugin2.applet.Plugin2Manager$AppletExecutionRunnable.run(Unknown Source)
     at java.lang.Thread.run(Unknown Source)
Exception: java.lang.UnsupportedClassVersionError: AMJApp : Unsupported major.minor version 51.0

Thanks again.
The page code is:
<html>
<head>
<title>Applet to JavaScript to PHP</title>
</head>
<body>
<script type="text/javascript">
function updateWebPage(myArg)
document.getElementById("txt1").innerHTML=myArg;
if (myArg=="")
document.getElementById("cbxItem").innerHTML="";
return;
if (window.XMLHttpRequest)
{// code for IE7+, Firefox, Chrome, Opera, Safari
xmlhttp=new XMLHttpRequest();
else
{// code for IE6, IE5
xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");
xmlhttp.onreadystatechange=function()
if (xmlhttp.readyState==4 && xmlhttp.status==200)
    document.getElementById("cbxItem").innerHTML=xmlhttp.responseText;
xmlhttp.open("GET","putitem.php?id="+myArg,true);
xmlhttp.send();
</script>
<form>
<table border=1 align='center' cellpadding=0 cellspacing=0 >
<tr><td style='text-align:center; background-color:#C0C0C0'>Compiled Java Applet</td></tr>
<tr><td><applet code="AMJApp.class" codebase="http://www.interactived.com/JMTalpha" archive="AMJ014.jar" width="500"height="500" MAYSCRIPT style="border-width:0;" name="jsap" id="jsap"></applet> </td></tr>
<tr><td style='text-align:center; background-color:#C0C0C0'>HTML Textbox filled by JavaScript</td></tr>
<tr><td><textarea style='width:500px; height:50px' name='txt1' id='txt1'>Query goes here</textarea></td></tr>
<tr><td style='text-align:center; background-color:#C0C0C0'>HTML diagnostic messages rendered by PHP script</td></tr>
<tr><td><div id="cbxItem">PHP info will populate this space</div></td></tr>
</table>
</form>
</body>
</html>The URL of the problem page is:
http://www.interactived.com/JMTalpha/AMJTest.htm
The code in the page is based on the following test page, which works:
http://www.interactived.com/test5Applet.htm
And the Applet, before I made any changes can be seen at this address:
http://www.interactived.com/jartest0906.htm
Thanks again for you interest.
Edited by: 886473 on 21-Sep-2011 00:47

Applet inside a JAR: Cannot access other classes within the JAR

Hello,
Description
Web app + applet (packaged in a JAR)
I have followed this tutorial
JAR contents
package mypackage
SimpleApplet.class
SimpleObj.class
_"SimpleApplet" uses "SimpleObj"_
package mypackage;
public class SimpleApplet extends JApplet {
    @Override
    public void init() {
        SimpleObj obj = new SimpleObj();
HTML code
<applet archive="SimpleApplet.jar" codebase="." code="mypackage.SimpleApplet.class" width="800" height="600" />
SimpleObj cannot be found (Java Console)
java.lang.NoClassDefFoundError: mypackage/SimpleObj
at java.lang.Class.getDeclaredConstructors0(Native Method)
at java.lang.Class.privateGetDeclaredConstructors(Unknown Source)
at java.lang.Class.getConstructor0(Unknown Source)
at java.lang.Class.newInstance0(Unknown Source)
at java.lang.Class.newInstance(Unknown Source)
at sun.plugin2.applet.Plugin2Manager.createApplet(Unknown Source)
at sun.plugin2.applet.Plugin2Manager$AppletExecutionRunnable.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
Caused by: java.lang.ClassNotFoundException: mypackage.SimpleObj
at sun.plugin2.applet.Applet2ClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClassInternal(Unknown Source)
... 8 more
Caused by: java.io.IOException: open HTTP connection failed:*http://localhost:8080/SimpleApp/mypackage/SimpleObj.class*
at sun.plugin2.applet.Applet2ClassLoader.getBytes(Unknown Source)
at sun.plugin2.applet.Applet2ClassLoader.access$000(Unknown Source)
at sun.plugin2.applet.Applet2ClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
... 12 more
Exception: java.lang.NoClassDefFoundError: mypackage/SimpleObj
It looks like JRE does not search for the SimpleObj class inside the JAR, but tries to get it from the server...
Any ideas?
Thanks in advance,
Gerard
Edited by: gsoldevila on Dec 10, 2008 2:05 AM

misread, deleted
Edited by: atmguy on Dec 10, 2008 1:12 PM

How to use an Applet with multiple-jars

Hi everybody,
I would like to use an applet with multiple-jars.
ex:
<applet codebase="." archive="main.jar,Addon1.jar,Addon2.jar" code="Appl.class" id="MyTest" width="600" height="30">
     <param name = "MyParam" value = "1;2">
</applet>
An applet with :
-> 1 Main JAR
-> X Addon JARs (X : a parameter "PRM")
My main part knows the parameter "PRM" -> knows which addon to use
My question is, how do I use classes from addons, inside the main part (and vise-versa if possible) ?
Thanks in advance
Best regards

I try what you say :
=== HTML ===
<applet codebase="." archive="Main.jar,Addon1.jar" code="Test.Appli.class" id="MyTest" width="600" height="30">
     <param name = "myPrm1" value = "1;2">
</applet>=== MAIN JAR ===
package retest;
interface InterfAddOn1 {
    public void AfficheTest1(String sStrTest);
public class Ctest {
    public Ctest() {}
    public void unTest(String sClassNameR) {
      String sClassName = "PackTestAddon.TestClass1";
      try {
          Object oObj = Class.forName(sClassName).newInstance();
          ((InterfAddOn1) oObj).AfficheTest1(" Hello World ");
      } catch (ClassNotFoundException ex1) {
          System.out.println("ERR Class not found");
      } catch (IllegalAccessException ex1) {
          System.out.println("ERR Illegal Access");
      } catch (InstantiationException ex1) {
          System.out.println("ERR Instantiation Exception");
}=== ADDON JAR ===
package PackTestAddon;
public interface InterfAddOn1 {
    public void AfficheTest1(String sStrTest);
package PackTestAddon;
public class TestClass1 implements InterfAddOn1 {
    public TestClass1() {}
    public void AfficheTest1(String sStrTest) {
      System.out.println("Test :"+sStrTest);
}I have this error :
Exception in thread "AWT-EventQueue-2" java.lang.ClassCastException: PackTestAddon.TestClass1
     at retest.Ctest.unTest(Ctest.java:58)
     at retest.Appli.actionPerformed(Appli.java:442)
     at javax.swing.AbstractButton.fireActionPerformed(Unknown Source)
     at javax.swing.AbstractButton$Handler.actionPerformed(Unknown Source)
     at javax.swing.DefaultButtonModel.fireActionPerformed(Unknown Source)
     at javax.swing.DefaultButtonModel.setPressed(Unknown Source)
     at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(Unknown Source)
     at java.awt.Component.processMouseEvent(Unknown Source)
     at javax.swing.JComponent.processMouseEvent(Unknown Source)
     at java.awt.Component.processEvent(Unknown Source)
     at java.awt.Container.processEvent(Unknown Source)
     at java.awt.Component.dispatchEventImpl(Unknown Source)
     at java.awt.Container.dispatchEventImpl(Unknown Source)
     at java.awt.Component.dispatchEvent(Unknown Source)
     at java.awt.LightweightDispatcher.retargetMouseEvent(Unknown Source)
     at java.awt.LightweightDispatcher.processMouseEvent(Unknown Source)
     at java.awt.LightweightDispatcher.dispatchEvent(Unknown Source)
     at java.awt.Container.dispatchEventImpl(Unknown Source)
     at java.awt.Component.dispatchEvent(Unknown Source)
     at java.awt.EventQueue.dispatchEvent(Unknown Source)
     at java.awt.EventDispatchThread.pumpOneEventForHierarchy(Unknown Source)
     at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
     at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
     at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
     at java.awt.EventDispatchThread.run(Unknown Source)
I don't really know why ... =;o(
Helppppp ... Thanks in advance.

Applet freezes while Jar is loading

Hi everyone,
I have a fundamental question concerning the loading mechanism of an applets resources.
The problem is as follows:
I have two jars, the first containing all *.class files, the second (size: 10MB) containing only graphics and sounds.
I start the applet with this code:
<APPLET ARCHIVE="init.jar,resources.jar" HEIGHT="100" [...]>Of course the point is to have the small init.jar loaded fast an display a loading animation while the big file is beeing loaded in the background. Up to here everything works as expected. When i start the applet, the init.jar is loaded and displays a loading animation as long as i try to get a resource from the resource.jar.
When I do that, my applet freezes while the big resource.jar file is beeing downloaded.
This is how i access the resource in the resource.jar
public void run() {
     while(/*some condition*/) {
          // this is the line which blocks until whole jar is downloaded
          java.io.InputStream input = this.getClass().getClassLoader().getResourceAsStream(/*resource String*/);
          // use input to load resource
}The freeze happens only upon the first time the while-loop runs, after that the resource.jar is chached and access is almost instant.
Now the concrete problem is, that the applet freezed in all its threads while the jar is beeing downloaded. I NEED to display an idle animation while this is done.
Has anyone any suggestion how i can avoid the complete freeze?
I have already concidered to load the resources without specifing the jar in the HTML-ARCHIVE-Tag, this works becouse of the codebase i can load the ressources from, but the problem is, that these resources have a large overhead from the server to the client until i can use them in the program.
Also it is no option to load them all on startup in another backgound thread (which would slove the freeze problem, i tried it), becouse i have to dynamically load and unload these resources to avoid OutOfMemory-Errors. Reloading them brings the overhead-Problem up again.
Only when i specify the 2nd jar in the ARCHIEVE-Tag i have direct access to the browsers chache without wasting memory when holding references to all resources.
After all every loading and stuff works, there are no errors in the programm only this strange behaviour. I Also tried it with different VMs, on different OS, and different Browser, all the same.
I would be glad if someone could give me a hint on this, i've been searching for days now, even tried to analyse the Classoader sources but ended up in sun's native calls...
Thank you in advance
- Loddi

I've been encountering the same problem and I think I've figured out the reason behind it and how to solve it.
It appears that the class loader can only ever load one resource at a time. Once you've forced it to start downloading resources.jar, it can't load any classes until that download has finished, not even classes that are part of the Java API. In your case I believe the solution would be to display one loop of your idle animation before you start loading resources.jar, to make sure that everything the idle animation needs has already been loaded by the class loader.

APPLET CODE="test.jar"..

Hi.
Is there a way to have a .jar loaded in HTML??
In the .jar I have a JApplet and some images...
The problem is to sign a .jar file... If I have to put a .class on the code PARAMETER the security problems will persist... Right??
Tanks

Reformulating the questions...
I have a Applet that need to be signed to have I/O...
How can I sign a .class file? The only way is to sign a .jar, rigth?
So how can I load a applet on a .jar file?
Thanks

Applet loads full jar instead one resource

Hi,
i noticed that applet load full jar file instead loading one image!
i load images with:
InputStream in = this.getClass().getResourceAsStream(kaynakAdresi);how can i fix this?

This will happen if the Jar is not being properly cached. Check your settings for the Plug-In and the browser; also check the headers are being sent correctly from the web server - if the expiry time etc are missing then the browser will not cache the file. Look up an HTTP sniffer if you need to trace the headers.,

Loading an image into an Applet from a JAR file

Hello everyone, hopefully a simple question for someone to help me with!
Im trying to load some images into an applet, currently it uses the JApplet.getImage(url) method just before registering with a media tracker, which works but for the sake of efficiency I would prefer the images all to be contained in the jar file as oppossed to being loaded individually from the server.
Say I have a class in a package eg, 'com.mydomain.myapplet.class.bin' and an images contained in the file structure 'com.mydomain.myapplet.images.img.gif' how do I load it (and waiting for it to be loaded before preceeding?
I've seen lots of info of the web for this but much of it is very old (pre 2000) and im sure things have changed a little since then.
Thanks for any help!

I don't touch applets, so I can't help you there, but here's some Friday Fun: tracking image loading.
import java.awt.*;
import java.awt.image.*;
import java.beans.*;
import java.io.*;
import java.net.*;
import javax.imageio.*;
import javax.imageio.event.*;
import javax.imageio.stream.*;
import javax.swing.*;
public class ImageLoader extends SwingWorker<BufferedImage, Void> {
    private URL url;
    private JLabel target;
    private IIOReadProgressAdapter listener = new IIOReadProgressAdapter() {
        @Override public void imageProgress(ImageReader source, float percentageDone) {
            setProgress((int)percentageDone);
        @Override public void imageComplete(ImageReader source) {
            setProgress(100);
    public ImageLoader(URL url, JLabel target) {
        this.url = url;
        this.target = target;
    @Override protected BufferedImage doInBackground() throws IOException {
        ImageInputStream input = ImageIO.createImageInputStream(url.openStream());
        try {
            ImageReader reader = ImageIO.getImageReaders(input).next();
            reader.addIIOReadProgressListener(listener);
            reader.setInput(input);
            return reader.read(0);
        } finally {
            input.close();
    @Override protected void done() {
        try {
            target.setIcon(new ImageIcon(get()));
        } catch(Exception e) {
            JOptionPane.showMessageDialog(null, e, "Error", JOptionPane.ERROR_MESSAGE);
    //demo
    public static void main(String[] args) throws IOException {
        final URL url = new URL("http://blogs.sun.com/jag/resource/JagHeadshot.jpg");
        EventQueue.invokeLater(new Runnable(){
            public void run() {
                launch(url);
    static void launch(URL url) {
        JLabel imageLabel = new JLabel();
        final JProgressBar progress = new JProgressBar();
        progress.setBorderPainted(true);
        progress.setStringPainted(true);
        JScrollPane scroller = new JScrollPane(imageLabel);
        scroller.setPreferredSize(new Dimension(800,600));
        JPanel content = new JPanel(new BorderLayout());
        content.add(scroller, BorderLayout.CENTER);
        content.add(progress, BorderLayout.SOUTH);
        JFrame f = new JFrame("ImageLoader");
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        f.setContentPane(content);
        f.pack();
        f.setLocationRelativeTo(null);
        f.setVisible(true);
        ImageLoader loader = new ImageLoader(url, imageLabel);
        loader.addPropertyChangeListener( new PropertyChangeListener() {
             public void propertyChange(PropertyChangeEvent evt) {
                 if ("progress".equals(evt.getPropertyName())) {
                     progress.setValue((Integer)evt.getNewValue());
                     System.out.println(evt.getNewValue());
                 } else if ("state".equals(evt.getPropertyName())) {
                     if (SwingWorker.StateValue.DONE == evt.getNewValue()) {
                         progress.setIndeterminate(true);
        loader.execute();
abstract class IIOReadProgressAdapter implements IIOReadProgressListener {
    @Override public void imageComplete(ImageReader source) {}
    @Override public void imageProgress(ImageReader source, float percentageDone) {}
    @Override public void imageStarted(ImageReader source, int imageIndex) {}
    @Override public void readAborted(ImageReader source) {}
    @Override public void sequenceComplete(ImageReader source) {}
    @Override public void sequenceStarted(ImageReader source, int minIndex) {}
    @Override public void thumbnailComplete(ImageReader source) {}
    @Override public void thumbnailProgress(ImageReader source, float percentageDone) {}
    @Override public void thumbnailStarted(ImageReader source, int imageIndex, int thumbnailIndex) {}
}

Java Applet fails loading JAR files

I'm using the OC4J setup with my Oracle forms (10g) install, this was working but no longer.
I get the message below when running the test.fmx from the Oracle Forms Services test page for each of the JAR files attempting to load.
I comment out the ARCHIVE statement but it still fails with
'java.lang.ClassNotFoundException:oracle.forms.engine.Main' on the applet window.
=====================
java.io.IOException: Connection failure with 504
     at sun.plugin.protocol.jdk12.http.HttpURLConnection.getInputStream(Unknown Source)
     at oracle.jre.protocol.jar.HttpUtils.followRedirects(Unknown Source)
     at oracle.jre.protocol.jar.JarCache$CachedJarLoader.isUpToDate(Unknown Source)
     at oracle.jre.protocol.jar.JarCache$CachedJarLoader.loadFromCache(Unknown Source)
     at oracle.jre.protocol.jar.JarCache$CachedJarLoader.load(Unknown Source)
     at oracle.jre.protocol.jar.JarCache.get(Unknown Source)
     at oracle.jre.protocol.jar.CachedJarURLConnection.connect(Unknown Source)
     at oracle.jre.protocol.jar.CachedJarURLConnection.getJarFile(Unknown Source)
     at sun.misc.URLClassPath$JarLoader.getJarFile(Unknown Source)
     at sun.misc.URLClassPath$JarLoader.<init>(Unknown Source)
     at sun.misc.URLClassPath$2.run(Unknown Source)
     at java.security.AccessController.doPrivileged(Native Method)
     at sun.misc.URLClassPath.getLoader(Unknown Source)
     at sun.misc.URLClassPath.getLoader(Unknown Source)
     at sun.misc.URLClassPath.getResource(Unknown Source)
     at java.net.URLClassLoader$1.run(Unknown Source)
     at java.security.AccessController.doPrivileged(Native Method)
     at java.net.URLClassLoader.findClass(Unknown Source)
     at sun.applet.AppletClassLoader.findClass(Unknown Source)
     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)
WARNING: error reading http://nzmdgrenfell01.asiapacific.hpqcorp.net:8889/forms/java/frmwebutil.jar from JAR cache.
Downloading http://nzmdgrenfell01.asiapacific.hpqcorp.net:8889/forms/java/frmwebutil.jar to JAR cache
java.io.IOException: Connection failure with 504
Any suggestions?
Regards......Derek

I found this Metalink that solved my problem.
Note:171159.1

applet tag regarding JAR file

Is there something wrong with the following applet declaration?
<applet code = "Sheep2.class" archive="Sheep2.jar" width = 500 height = 300
ALT="If you could run this applet, you'd see a sky, a field, and a moon.">
Your browser is completely ignoring the <APPLET> tag!
</applet>
Works fine (it seems) on my Windows 98 computer with IE 6.0280, but does not work on the same computer when I access the page calling the applet using AOL's v.9 browser.
I used HtmlConverter to convert the above to Extended version (covering all platforms), and still does not work with AOL's browser. HtmlConverter reported no errors, but now IE shows an error icon in its status bar when I access the page even offline.
Other html files I converted using HtmlConverter work fine with AOL's browser. They don't have "archive" attribute.
What could be going wrong? My guess is JAR file reference is causing problems.

I did more Html Conversion today. I ran one file which didn't show any error mark in the status bar of IE through HtmlConverter. I ran the new file generated by HtmlConverter and an error icon appeared in the status bar of IE. My Java Console didn't show any message. So, it must be an error in the applet related info HtmlConverter generated was not 100% html compliant..
BTW, I started speculating the cause of my applets not working on the computer of oen of my friends is simply that her Java Plug-in cannot handle Swing components' J classes.

Error running applet within a jar

I compile the jar files together with the smack.jar and smackx.jar and then signed the applet
try to run with this code for my HTML file
<html>
<head>
<meta HTTP-EQUIV="CACHE-CONTROL" CONTENT="NO-CACHE">
<meta HTTP-EQUIV="Expires" CONTENT="-1">
<title> Applet Test</title>
</head>
<applet code="chat\chat\ChatApplet" archive="chat.jar" width=600 height=400>
</applet>
</html>it prompts me to run the application, I select 'Yes' and it give me this load of error
Java Plug-in 1.6.0_06
Using JRE version 1.6.0_06 Java HotSpot(TM) Client VM
User home directory = C:\Documents and Settings\blah
c:   clear console window
f:   finalize objects on finalization queue
g:   garbage collect
h:   display this help message
l:   dump classloader list
m:   print memory usage
o:   trigger logging
p:   reload proxy configuration
q:   hide console
r:   reload policy configuration
s:   dump system and deployment properties
t:   dump thread list
v:   dump thread stack
x:   clear classloader cache
0-5: set trace level to <n>
java.lang.NoClassDefFoundError: chat/chat/ChatApplet (wrong name: chat/ChatApplet)
     at java.lang.ClassLoader.defineClass1(Native Method)
     at java.lang.ClassLoader.defineClass(Unknown Source)
     at java.security.SecureClassLoader.defineClass(Unknown Source)
     at java.net.URLClassLoader.defineClass(Unknown Source)
     at java.net.URLClassLoader.access$000(Unknown Source)
     at java.net.URLClassLoader$1.run(Unknown Source)
     at java.security.AccessController.doPrivileged(Native Method)
     at java.net.URLClassLoader.findClass(Unknown Source)
     at sun.applet.AppletClassLoader.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)

java.lang.NoClassDefFoundError: chat/chat/ChatApplet (wrong name: chat/ChatApplet)The above says you use chat/chat/ChatApplet but it should be chat/ChatApplet.

Applet that archieve jar file fail to load picture

hello...
i already can display my applet , but the ploblem is the applet canot display the picture...
the class that i include in the jar file is can run and will display the picture...
wat is the ploblem?
thanks...

This is my full code
package dir.yew;
import java.awt.*;
import java.awt.event.*;
import java.io.*;
import java.util.*;
import java.applet.*;
import javax.swing.*;
import javax.swing.tree.*;
import javax.swing.event.*;
public class DirTree
     extends JPanel {
     public static final String APP_NAME = "Directories Tree";
     public static final ImageIcon ICON_COMPUTER =
          new ImageIcon("computer.gif");
     public static final ImageIcon ICON_DISK =
          new ImageIcon("disk.gif");
     public static final ImageIcon ICON_FOLDER =
          new ImageIcon("folder.gif");
     public static final ImageIcon ICON_EXPANDEDFOLDER =
          new ImageIcon("expandedfolder.gif");
     protected JTree m_tree;
     protected DefaultTreeModel m_model;
     protected JTextField m_display;
     public DirTree() {
          DefaultMutableTreeNode top = new DefaultMutableTreeNode(
               new IconData(ICON_COMPUTER, null, "My Computer"));
          DefaultMutableTreeNode node;
          File[] roots = File.listRoots();
          for (int k=0; k<roots.length; k++) {
               node = new DefaultMutableTreeNode(new IconData(ICON_DISK,
                    null, new FileNode(roots[k])));
               top.add(node);
            node.add( new DefaultMutableTreeNode(new Boolean(true)));
          m_model = new DefaultTreeModel(top);
          m_tree = new JTree(m_model);
          m_tree.putClientProperty("JTree.lineStyle", "Angled");
          IconCellRenderer renderer = new
               IconCellRenderer();
          m_tree.setCellRenderer(renderer);
          m_tree.addTreeExpansionListener(new
               DirExpansionListener());
          m_tree.addTreeSelectionListener(new
               DirSelectionListener());
          m_tree.getSelectionModel().setSelectionMode(
               TreeSelectionModel.SINGLE_TREE_SELECTION);
          m_tree.setShowsRootHandles(true);
          m_tree.setEditable(false);
               JScrollPane splitPane = new JScrollPane(
          new JScrollPane(m_tree)
          setLayout( new BorderLayout() );
          add( splitPane );
     DefaultMutableTreeNode getTreeNode(TreePath path) {
          return (DefaultMutableTreeNode)(path.getLastPathComponent());
     FileNode getFileNode(DefaultMutableTreeNode node) {
          if (node == null)
               return null;
          Object obj = node.getUserObject();
          if (obj instanceof IconData)
               obj = ((IconData)obj).getObject();
          if (obj instanceof FileNode)
               return (FileNode)obj;
          else
               return null;
       class DirExpansionListener implements TreeExpansionListener {
        public void treeExpanded(TreeExpansionEvent event) {
            final DefaultMutableTreeNode node = getTreeNode(
                event.getPath());
            final FileNode fnode = getFileNode(node);
            Thread runner = new Thread() {
                    public void run() {
                         if (fnode != null && fnode.expand(node)) {
                              Runnable runnable = new Runnable() {
                                   public void run() {
                                        m_model.reload(node);
                              SwingUtilities.invokeLater(runnable);
            runner.start();
        public void treeCollapsed(TreeExpansionEvent event) {}
     class DirSelectionListener
          implements TreeSelectionListener {
          public void valueChanged(TreeSelectionEvent event) {
               DefaultMutableTreeNode node = getTreeNode(
                    event.getPath());
               FileNode fnode = getFileNode(node);
               if (fnode != null)
                    m_display.setText(fnode.getFile().
                         getAbsolutePath());
               else
                    m_display.setText("");
     public static void main(String argv[]) {
          JFrame frame= new JFrame( "FileSystem Viewer");
          DirTree dir = new DirTree();
          frame.getContentPane().add(dir);
          frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
          frame.pack();
          frame.setVisible(true);
class IconCellRenderer
     extends    DefaultTreeCellRenderer {
     public IconCellRenderer() {
          setLeafIcon(null);
          setOpenIcon(null);
     public Component getTreeCellRendererComponent(JTree tree,
          Object value, boolean sel, boolean expanded, boolean leaf,
          int row, boolean hasFocus) {
          // Invoke default implementation
          Component result = super.getTreeCellRendererComponent(tree,
               value, sel, expanded, leaf, row, hasFocus);
          DefaultMutableTreeNode node =
               (DefaultMutableTreeNode)value;
          Object obj = node.getUserObject();
          setText(obj.toString());
        if (obj instanceof Boolean)
               setText("Retrieving data...");
          if (obj instanceof IconData) {
               IconData idata = (IconData)obj;
               if (expanded)
                    setIcon(idata.getExpandedIcon());
               else
                    setIcon(idata.getIcon());
          else
               setIcon(null);
          return result;
class IconData {
     protected Icon   m_icon;
     protected Icon   m_expandedIcon;
     protected Object m_data;
     public IconData(Icon icon, Object data) {
          m_icon = icon;
          m_expandedIcon = null;
          m_data = data;
     public IconData(Icon icon, Icon expandedIcon, Object data) {
          m_icon = icon;
          m_expandedIcon = expandedIcon;
          m_data = data;
     public Icon getIcon() {
          return m_icon;
     public Icon getExpandedIcon() {
          return m_expandedIcon!=null ? m_expandedIcon : m_icon;
     public Object getObject() {
          return m_data;
     public String toString() {
          return m_data.toString();
class FileNode {
     protected File m_file;
     public FileNode(File file) {
          m_file = file;
     public File getFile() {
          return m_file;
     public String toString() {
          return m_file.getName().length() > 0 ? m_file.getName() :
               m_file.getPath();
     // Alternatively we copud sub-class TreeNode
     public boolean expand(DefaultMutableTreeNode parent) {
          DefaultMutableTreeNode flag =
               (DefaultMutableTreeNode)parent.getFirstChild();
          if (flag==null)       // No flag
               return false;
          Object obj = flag.getUserObject();
          if (!(obj instanceof Boolean))
               return false;      // Already expanded
          parent.removeAllChildren(); // Remove Flag
          File[] files = listFiles();
          if (files == null)
               return true;
          Vector v = new Vector();
          for (int k=0; k<files.length; k++) {
               File f = files[k];
               if (!(f.isDirectory()))
                    continue;
               FileNode newNode = new FileNode(f);
               boolean isAdded = false;
               for (int i=0; i<v.size(); i++) {
                    FileNode nd = (FileNode)v.elementAt(i);
                    if (newNode.compareTo(nd) < 0) {
                         v.insertElementAt(newNode, i);
                         isAdded = true;
                         break;
               if (!isAdded)
                    v.addElement(newNode);
          for (int i=0; i<v.size(); i++) {
               FileNode nd = (FileNode)v.elementAt(i);
               IconData idata = new IconData(DirTree.ICON_FOLDER,
                    DirTree.ICON_EXPANDEDFOLDER, nd);
               DefaultMutableTreeNode node = new
                    DefaultMutableTreeNode(idata);
               parent.add(node);
               if (nd.hasSubDirs())
                    node.add(new DefaultMutableTreeNode(
                         new Boolean(true) ));
          return true;
     public boolean hasSubDirs() {
          File[] files = listFiles();
          if (files == null)
               return false;
          for (int k=0; k<files.length; k++) {
               if (files[k].isDirectory())
                    return true;
          return false;
     public int compareTo(FileNode toCompare) {
          return m_file.getName().compareToIgnoreCase(
               toCompare.m_file.getName() );
     protected File[] listFiles() {
          if (!m_file.isDirectory())
               return null;
          try {
               return m_file.listFiles();
          catch (Exception ex) {
               JOptionPane.showMessageDialog(null,
                    "Error reading directory "+m_file.getAbsolutePath(),
                    DirTree.APP_NAME, JOptionPane.WARNING_MESSAGE);
               return null;
}

Signed applet : problem signing jar files that are in build path

Hello,
I have a problem while trying to create an ftp applet.
I use org.apache.commons.net.ftp and i build path for commons-net-1.1.4.jar and then i build my classes.
When i create a jar file with my classes and after signing it, it works under eclipse but not on a web page.
I had signed commons-net-1.1.4.jar before to build the path in eclipse but commons-net-1.1.4.jar is not in my jar file.
What is the way to sign applet correctly even if some jar ressources are in eclipse build path.
Thank you

You were right!!!
I'm not sure what to write down in the formsweb.cfg (configuration file) , following the instructions on the on-line help of Developer Forms 10g , in step 9..
The step 9 says...
Because in this release the JACOB code is in an external Jar file and not incorporated into frmwebutil.jar, it needs to be downloaded. To do this, change the WebUtilArchive setting to read: webUtilArchive=/forms/webutil/frmwebutil.jar,/forms/webutil/jacob.jar
The doudt is pointed to the fact that the frmwebutil.jar isn't in the ORACLE_HOME\forms\webutil path but it is ORACLE_HOME\forms\java path.
Also , these paths referenced in webUtilArchive are physical paths in a Unix system or they are logical paths in a url?
Simon

Applet in a .jar file?

I want to program a program which can be used as application or as applet. Is it possible to create a .jar file and use something inside as applet? What would the <applet> tag look like?

Sorry, I guess I thought you had this working already. In any case, here is an example of some JApplet code that runs either as an applet on a web page or as an application in a JFrame. It is the applet from the html-applet tag example I provided above. It is missing some classes, so it won't compile of course, but it shows all the applet vs. application code. This methodology also works in older non-swing applets ...just follow a technique similar to what you see below:
If you didn't need to see this ...please just ignore it. Good luck.
/** Applet or application example. */
public class RasterGameOfLife extends javax.swing.JApplet {
RasterLifeCanvas canvas;                // The drawing area
RasterLifeCanvas.LifeControls controls; // The drawing controls
/** the applets init method sets up some gui components */
public void init() {
    canvas = new RasterLifeCanvas();
    controls = canvas.getControls();
    getContentPane().setLayout( new java.awt.BorderLayout() );
    getContentPane().add( "Center", canvas );
    getContentPane().add( "South", controls );
/** the applets destroy method cleans up after execution */
public void destroy() {
    remove( controls );
    remove( canvas );
/** the applets start method enables and begins an animation sequence */
public void start() {
    controls.setEnabled( true );
    controls.startAnimation();
/** the applets stop method stops and disables an animation sequence */
public void stop() {
    controls.stopAnimation();
    controls.setEnabled( false );
   * main is where the alternative application code is placed
   * this code does not execute when the program is run as an applet
public static void main(String args[]) {
    javax.swing.JFrame f = new javax.swing.JFrame();      // create a JFrame for the application
    final RasterGameOfLife life = new RasterGameOfLife(); // create an instance of the applet
    life.init();     // Manually call the init method
    life.start();    // Manually call the start method
    f.addWindowListener( new java.awt.event.WindowAdapter() {
      public void windowClosing( java.awt.event.WindowEvent e ) {
        life.stop(); // Manually call the stop method
        System.exit(0);
    f.getContentPane().add( "Center", life );
    // or sometimes I use this alternative to get the applets contentPane
    //f.getContentPane().add( "Center", life.getContentPane() );
    f.setSize( 734, 435 );
    f.show();
}

Applet in a .JAR

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