URGENT: Beginner - Signed Applet won't run within Netscape

Hi all,
sorry for asking a question you've probably answered before, but I didn't find appropriate material
while searching this forum.
Im using Netscape 4.77 on Windows. My approach is to create a signed applet out of one class file, that actually reads and writes files and requires one System Property to be known.
Therefore i downloaded the Netscape Signing Tool, created a test certificate and installed it in the Communicators certificate database. Then I signed my class file as I was told on Netscapes websites. Everything worked fine and the applet displayed in the browser. Unfortunately the method bound to a button, that does the critical work, doesn't have any effect at all.
Can you please tell me where I can turn on the equivalent to Microsofts Java Console for IE in Netscape ? I don't even get error messages.
Next I read some stuff about the Netscape Capability classes and used them as shown in my Applet. I set the classpath correct and everything compiled fine. But still the critical applet method doesn't do a thing at all. What went wrong ?
Did i put the netscape code at the wrong place (i.e. inside the actionPerformed() method) ?
Or would you suggest another way to get rid of the security restrictions which is quite more popular these days. All the docs didn't help me out so far.
Please help me.
Any help is highly appreciated.
cu
oliver

If you want your Java Applet to use the most current
functionality then you should deploy your Applet
with the Java Plugin that will work in Netscape or
Windows IE.
Once the Java Plugin is install launch the Java Plugin Control Panel and check the Java console option. This will launch the Java console everytime the Java Plugin is invoked. Reference the following url on how to use
the Java Plugin:
http://java.sun.com:80/products/plugin/1.3/docs/index.docs.html
Even though JDK1.4 is not officially shipping the
Java Plugin 1.4 documents on Security are fairly
good. Check out :
http://java.sun.com:80/j2se/1.4/docs/guide/plugin/developer_guide/contents.html
http://java.sun.com:80/j2se/1.4/docs/guide/plugin/developer_guide/rsa_how.html
regards,
atsSun
Sun Microsystems

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Signed applets won't run @ web, only locally

Hey, all elitist java folk, here is one for you:
I have succeded in creating a signed, and an un-signed java applet - both run well locally. The signed applet, writes to a local file.
Both are merely proof of concept.
So, here is the deal:
I upload both to a webserver (one of those where you get 50Mb for free) via ftp (not ASCII, binary transfer), and only the unsigned will run in my browsers (Opera, FF, MSIE tested).
The signed one writes to the screen: "Could not instantiate."
I belive the problem lies in the HTML, which is very basic but still works locally. I don't have any clsid-thingy, is this nessecary? Where do I read about this?
HTML that (should) load the signed applet:
<html>
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</body>
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Btw, I am not interessed in editing any policy-file; my signed applet should work "out-of-the-box" for any java-enabled browser on the Internet.
All I want is for the browser to load the signed java applet, ask user for certificate confirmation, and run it... Just like with http://jupload.sourceforge.net/applet-basic.html , which also access local filesystem.

If you open the Java Console what does it say?
There shouldn't be any difference in loading the applet locally or from the webserver... presuming the HTML and jar files and classnames and stuff are all correct relative to both locations.

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I have an applet that runs perfectly in the netbeans IDE, but won't run from command prompt (I'm using windows) or from a browser. I've been banging my head against the wall for a few days on this one. Here's the HTML I'm using:
<applet width="400" height="525" code="musicapplet.class" archive="crypticgraffiti.jar">
<param name="bgcolor" value="ffffff"> <param name="fontcolor" value="000000">
</param> </param> Your browser is not Java enabled. </applet>
Here is the structure of the jar file's contents:
META-INF/
META-INF/MANIFEST.MF
com/
com/crypticgraffiti/
com/crypticgraffiti/music/musicapplet
com/crypticgraffiti/music/GetNotes.class
com/crypticgraffiti/music/InstList.class
com/crypticgraffiti/music/Mode.class
com/crypticgraffiti/music/MusicCreator.class
com/crypticgraffiti/music/OctaveTransformer.class
com/crypticgraffiti/music/Phrase.class
musicapplet/MusicApplet$playerThread.class
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When I attempt to load via html:
"basic: load: class musicapplet.class not found.
load: class musicapplet.class not found.
java.lang.ClassNotFoundException: musicapplet.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)
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I have tried every possible variation for the 'code' element of the applet tag (package.mainclass.class, mainclass, mainclass.class, etc). I have also tried compiling with JDK 1.6 and this didn't change anything. I've tried clearing out the cache of temporary files using the java control panel settings, and have verified that my browser can run other applets using JRE 6 and 7.
I've tried some different ways of distributing the applet, also: putting all the class files in the folder with the html file, putting the classes in a source folder in the same folder as the html file, and finally putting a jar in the same folder as the html file (which really seems the simplest).
Any help at all would be most appreciated! This applet is a very cool and original music creating app that draws heavily on the JFugue API. It's a shame that I can't get it online for people to play with!

Cryptic Graffiti wrote:
Here is the structure of the jar file's contents:
META-INF/
META-INF/MANIFEST.MF
com/
com/crypticgraffiti/
com/crypticgraffiti/music/musicapplet
com/crypticgraffiti/music/GetNotes.class
com/crypticgraffiti/music/InstList.class
com/crypticgraffiti/music/Mode.class
com/crypticgraffiti/music/MusicCreator.class
com/crypticgraffiti/music/OctaveTransformer.class
com/crypticgraffiti/music/Phrase.class
musicapplet/MusicApplet$playerThread.class
musicapplet/MusicApplet.class
(Musicapplet.class is the main class)
Please note that class names are case sensitive so "MusicApplet" is not same as "Musicapplet" or "musicapplet". Your applet tag should have fully qualified class name (without quotes) and should look like this:
<applet width=400 height=525 code=musicapplet.MusicApplet archive="crypticgraffiti.jar">
</applet>
The JAR should be in the same directory as your HTML file. While launching from command line, you can also check if your JAR file is getting included in classpath.
Thanks,
Nitin

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Are you sure your HTML file is in the same directory as your applet file?
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http://java.sun.com/products/plugin/1.3/converter.html

Java 1.1.5 applets don't run in Netscape 6.1/6.2

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Java Virtual Machine Build 3234 is installad
Systems NT4.0 and Win2000
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Thanks for any help....
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PS) I have no experience in Java at all.

Hello,
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URGENT Help for applet with JAR file in Netscape

I am having Applet with few classes
Html is in /www directory
and all class files are in /www/javaclassfiles
I jared all javaclassfiles with following command
c:\www\javaclassfiles>jar -cvf sample.jar TaxPaymentAppletForm.class *.class
where sample.jar is my jar file and TaxPaymentAppletForm.class is the main applet class file.
THEN I DELETED ALL CLASS FILES & KEPT ONLY SAMPLE.JAR FILE ON SERVER
My html code is like below:
<APPLET CODE="TaxPaymentAppletForm" ARCHIVE="sample.jar" CODEBASE="JavaClassFiles" WIDTH=460 HEIGHT=400></APPLET>
The things are running on IE properly, but not on Netscape. Netscape is giving following error :
java.io.IOException: <null>
at netscape.net.URLConnection.connect(Compiled Code)
at netscape.net.URLConnection.getInputStream(Compiled Code)
* at netscape.applet.AppletClassLoader.grabArchiveFile(Compiled Code)
at netscape.applet.AppletClassLoader.openArchive(Compiled Code)
at netscape.applet.AppletClassLoader.openArchive(Compiled Code)
at netscape.applet.AppletClassLoader.<init>(Compiled Code)
at netscape.applet.AppletClassLoader.getClassLoader(Compiled Code)
at netscape.applet.DerivedAppletFrame$LoadAppletEvent.dispatch(Compiled Code)
at java.awt.EventDispatchThread$EventPump.dispatchEvents(Compiled Code)
at java.awt.EventDispatchThread.run(Compiled Code)
at netscape.applet.DerivedAppletFrame$AppletEventDispatchThread.run(Compiled Code)
# Unable to load archive http://nearbuy_server:90/iras/JavaClassFiles/sample.jar: java.io.IOException: <null>
# Applet exception: class TaxPaymentAppletForm could not be loaded
# Applet exception: class TaxPaymentAppletForm could not be loaded
# Applet exception: class TaxPaymentAppletForm could not be loaded
In netscape also it is sometimes running some times not, without any logical reson.
Any help regarding this is appreciated
manisha

Following is the more detailed analysis when applet is running and when not
On local server, it is running fine on both IE / Netscape
When I transfered jar file to live server
On IE it is running for the first time and then onwards not running, If I clear the catch then again applet is running.
For second time it is giving following error :
IOException Loading Archive: http://dev1.janusx-collections.com/iras/JavaClassFiles/AppletForm.jar
java.io.IOException: dev1.janusx-collections.com:80//iras/JavaClassFiles/AppletForm.jar
at com/ms/net/wininet/http/HttpInputStream.connect
at com/ms/net/wininet/http/HttpInputStream.<init>
at com/ms/net/wininet/http/HttpURLConnection.createInputStream
at com/ms/net/wininet/WininetURLConnection.getInputStream
at com/ms/vm/loader/JarArchiveSet.loadNextJar
at com/ms/vm/loader/JarArchiveSet.getResourceBits
at com/ms/vm/loader/JarArchiveSet.getClassData
at com/ms/vm/loader/ResourceLoader.getClassData
at com/ms/vm/loader/URLClassLoader.findClass
at com/ms/vm/loader/URLClassLoader.loadClass
at com/ms/vm/loader/URLClassLoader.loadClass
at com/ms/applet/AppletPanel.processSentEvent
at com/ms/applet/AppletPanel.processSentEvent
at com/ms/applet/AppletPanel.run
at java/lang/Thread.run
java.lang.ClassNotFoundException: TaxPaymentAppletForm
at com/ms/vm/loader/URLClassLoader.loadClass
at com/ms/vm/loader/URLClassLoader.loadClass
at com/ms/applet/AppletPanel.processSentEvent
at com/ms/applet/AppletPanel.processSentEvent
at com/ms/applet/AppletPanel.run
at java/lang/Thread.run
ON Netscape it is NOT running at all on from live server and error is as given in above first post.
manisha

Java Applets won't load in Netscape 4

Hello,
No java applets will load in Netscape 4. I checked to see if java plugins existed and they do I actually have about 4 different versions installed on my computer because I have been trying to resolve this issue. I looked in the browsers plugins directory it contains four java .dll files. Does anybody know whats going on? In internet explorer java applets load correctly.
Thank You,
Mark

Perhaps it is due to your HTML code in the webpage? If you use the <APPLET> tag only, the applet may not run in all browser/platform. You can use HtmlConverter that comes with JDK/JRE 1.4 in order to generate HTML code which allows your applet to run in any browser/platform.
Hope it helps,
A.A.
Hello,
No java applets will load in Netscape 4. I checked to
see if java plugins existed and they do I actually
have about 4 different versions installed on my
computer because I have been trying to resolve this
issue. I looked in the browsers plugins directory it
contains four java .dll files. Does anybody know whats
going on? In internet explorer java applets load
correctly.
Thank You,
Mark

Applet won't run in browser

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Noob

By default applets can't read the local filesystem. Presumably Eclipse lets you do it to make development easier. If you want your applet to read the local filesystem, you apparently have to sign it.

Applet won't run if put in JAR file

Hello, I've searched a lot and couldn't find an answer to my problem -
I want to put my applet into a jar file. and run it, of course.
I have a jar file that contains "b.class", "temp.class" both of them in directory "package_name", which is their package's name in eclipse. (this jar I obtained by using export from eclipse).
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<APPLET
CODE="b.class"
ARCHIVE "jar_file.jar"
WIDTH="100%" HEIGHT="90"
</APPLET>
both the index.html and the jar file in the same directory.
and the applet wont run!
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but I already tried everything - with no success :(
Kogan.

OK the problem solved -here is highlighted what I was missing -
<APPLET
CODE=package_name.b.class ( I was missing the "package_name")
codebase = "."
ARCHIVE "jar_file.jar"
WIDTH="100%" HEIGHT="90"
</APPLET>
Edited by: Kogan on Nov 3, 2008 6:51 AM
Edited by: Kogan on Nov 3, 2008 6:52 AM

Java applet won't run: ClassFormatError: Unknown constant tag 115

Hi,
About two years ago I uploaded an applet to a server and it ran fine. Since then I've done minor tweaks to the applet and it works on my computer, but I recently uploaded it to a new server and now it gives me the following:
java.lang.ClassFormatError: Unknown constant tag 115 in class file chemlet
     at java.lang.ClassLoader.defineClass1(Native Method)
     at java.lang.ClassLoader.defineClass(Unknown Source)
     at java.security.SecureClassLoader.defineClass(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.ClassFormatError: Unknown constant tag 115 in class file chemlet
     at java.lang.ClassLoader.defineClass1(Native Method)
     at java.lang.ClassLoader.defineClass(Unknown Source)
     at java.security.SecureClassLoader.defineClass(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)
I've already checked that I uploaded everything in binary and that my .class files are intact on the server. In fact I uploaded my files and downloaded them back onto my computer and they run fine. Also I have another applet running smoothly on the same server (which also used to reside on the old server) and it's not having any problems. I have 9 .class files in total and all of them are uploaded. chemlet is the file where execution should start. Any ideas for what to do?
Thanks in advance.

Either there is some version problem in applet. or the classfile might have some constant which is not getting referenced properly.
might be in your chemlet file . use decompiler to open your class file and then check the line number 115 in your chemlet file to see what is the problem there.

Applet won't run in Internet Explorer

I am having problems running applets that I create. They don't run in Internet Explorer. Other applets will run in the browser but it seems to use the Microsoft VM, not the JVM from Sun. The Mozilla Firefox browser will run all applets using the JVM from Sun.

to api00
If you cannot see an entry in IE Tools menu named Sun Java Console and open it , then do the following.
1.Open Windows' Control Panel and look for an entry "Java Plug-in".
- If it's not there, go here http://java.com/en/index.jsp and click the "Get It Now" button to install the Java Plug-in.
- If it's there, click it, and then the Browser tab. Make sure that "Internet Explorer" is checked, then close all instances of IE. Go to this page and try one of the applets: http://java.sun.com/j2se/1.4.2/docs/relnotes/demos.html
2. If that doesn't resolve the problem, remove ALL Sun Java stuff that you can find - check directories and the Registry - and do a clean install of Java.
to twinkietwin
Question 1: It appears that you typed the error text in your message #8, because there are capitalization and spelling problems that do not exactly match the errors that Java produces. Is this the case? If so please cut and paste the verbatim text of the errors from the window that appears when you click on the "More Details" button of the "Error - Java General Exception" box. (The EXACT and TOTAL error test is important.)
It appears that the applet is attempting to acquire the value of some variables from the HTML code that calls the applet, but for some reason it cannot find the HTML file named "example1.htm" that contains the variables. One possibility is that there is a file on your computer named either example1.htm or example1.html that is being found first. Check your machine for files with one of these names; if found, temporarily rename it to something else and try the Sun BarChart applet from the demo page again.

Applet won't run on all platforms

I've written a simple applet that compiles cleanly (apparently), and
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Pro system, I get these messages in the appletviewer window:
error:null
then
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and in the DOS box I call appletviewer from, I get a string of
messages :
at Panel.<init>(Panel.java:10)
I'm using J2SE 1.4.1 on my XP system.
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OK, here's the code:
//CardDemo.java
// action handling with multiple events
import java.awt.*;
import java.applet.*;
import java.awt.event.*;
public class CardDemo extends Applet implements ActionListener{
//Control panel components
Panel pnlControls = new Panel();
Button btnFirst = new Button("|<<");
Button btnPrev = new Button("<==");
Button btnC = new Button("C");
Button btnNext = new Button("==>");
Button btnLast = new Button(">>|");
//The Cards
Panel pnlCards = new Panel();
CardLayout Stack = new CardLayout();
Label lblA = new Label("A");
Label lblB = new Label("B");
Label lblC = new Label("C");
Label lblD = new Label("D");
Label lblE = new Label("E");
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    pnlControls.setFont(new Font("SanSerif",Font.BOLD, 20));
    pnlControls.setLayout(new FlowLayout());
    pnlControls.add(btnFirst);
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    pnlControls.add(btnC);
    pnlControls.add(btnNext);
    pnlControls.add(btnLast);
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    btnFirst.addActionListener(this);
    btnPrev.addActionListener(this);
    btnC.addActionListener(this);
    btnNext.addActionListener(this);
    btnLast.addActionListener(this);
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    pnlCards.setLayout(Stack);
    pnlCards.setFont(new Font("SanSerif",Font.BOLD, 60));
    pnlCards.add(lblA,"A");
    pnlCards.add(lblB,"B");
    pnlCards.add(lblC,"C");
    pnlCards.add(lblD,"D");
    pnlCards.add(lblE,"E");
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    lblA.setAlignment(Label.CENTER);
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    lblE.setAlignment(Label.CENTER);
   } // end init
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         String theCommand = e.getActionCommand();
         //check to see which button was pressed
         if (theCommand.equals("|<<")){
        Stack.first(pnlCards);
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        Stack.previous(pnlCards);
      else if (theCommand.equals("C")){
        Stack.show(pnlCards,"C");
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      else if (theCommand.equals(">>|")){
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} // end class def

Applet won't run across server

I am a JAVA beginner and I have made an applet compiled it and am calling the .class file with html page. It works perfectly on my pc in IE and firefox. The problem is that when I uploaded the files to a server they no longer work...just a red X and a applett failed message in the status bar.....
any suggestions / help would be great! Thanks

I see this in the Java console:
java.lang.ClassFormatError: Extra bytes at the end of class file RumfordHW6
This looks to me like RumfordHW6.class has been corrupted when
moved to the server. How did you move it? Did you use BINARY FTP?
Try to make absolutely sure your file and the server file are the same.

Applet won't run on the IIS Server/...

I have a very simple applet which connects to my Personal Oracle 8...
When the applet starts on the web browser, it gives me this message...
Any ideas???
Any help would be great...
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CacheHandler file name: C:\WINNT\Profiles\Administrator\Temporary Internet Files\Content.IE5\O10Z6DYZ\ModuleInfo[1].class
Opening http://tuc_wkst/test/oracle/dacf/dataset/ResultSetInfo.class no proxy
CacheHandler file name: C:\WINNT\Profiles\Administrator\Temporary Internet Files\Content.IE5\85UZK96V\ResultSetInfo[1].class
Opening http://tuc_wkst/test/oracle/dacf/dataset/InfoObject.class no proxy
CacheHandler file name: C:\WINNT\Profiles\Administrator\Temporary Internet Files\Content.IE5\4LQBSTU3\InfoObject[1].class
Opening http://tuc_wkst/test/oracle/dacf/dataset/DacObject.class no proxy
java.lang.NoClassDefFoundError: oracle/dacf/dataset/DacObject
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 java.lang.ClassLoader.loadClass(Unknown Source)
at sun.applet.AppletClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
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 java.lang.ClassLoader.loadClass(Unknown Source)
at sun.applet.AppletClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.Class.newInstance0(Native Method)
at java.lang.Class.newInstance(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)
null

for more info: I deinstalled all plug-in versions and then ran the applet. I prompted to download plugin-1.2. Clicked ok. The plug-in downloaded and installed. But after that when I run the applet, the applet viewer(browser) loaded for a sec. then disapears.
Any help please. Thanks.

URGENT: Beginner - Signed Applet won't run within Netscape

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