Class not found error for applet.

This is probally a really simple mistake but I've tried everything and can't find it.
My applet works fine with applet viewer - I'm running it from JBuilder. But when I open my html file in the browser it gives me a 'Class not found' error. I've tried running other applets (my own and demos on this site) and they work fine.This is the applet tag code:
<applet code = "Rotary.class" width = "650" height = "580" align = "top">

<param name = "sector0" value ="234,215,244,207,154,43,125,63">
</applet>
The class file is in the same directory as the HTML file. Do I need to specify the codebase? I tried that too - giving it the full pathname of the class.
In the Java console it said that it couldn't find "C:Project\Rotary\javax\swing\japplet"
I don't think it could have anything to do with the fact that I'm using swing because the other applets I used used swing.
Please help - I'm really running out of ideas here!

You have a similar problem like I had.
You seem to have a too old JAVA environment for the browser - I had a too new environment.
For all who are experiencing the same problem!
Problem:
You're compiling your applets with a quiet modern compiler (i.e. Netbeans Version 3.5.1)
You are able to compile your applets without any problems but if you try your applets in "real life", the browsers can't interpret your applets [class not found]. (I tested Internet Explorer 6.0 and Netscape Navigator 4.7)
So you need a plugin for the new JAVA environment because the JAVA environment of the browser is older than that which the applet needs.
Well, you have the choice to demand to every user of your applet to download the new Java Runtime Environment, but then don't wonder why nobody visits your site!
But, don't worry: I figuered out another solution, that Netbeans (www.netbeans.org) allows to compile in different JAVA versions.
Solution:
What you have to do is:
- Install a previous version of JDK (i.e. JDK 1.3 - I would suggest, lower versions don't work with Netbeans 3.5.1 and JDK 1.3 is enough for IE 6.0 and NN 4.7, which I tested)
- Go into the "bin"-directory of Netbeans (i.e. c:/netbeans3.5.1/bin)
- Open the file "ide.cfg" (with notepad or any other texteditor)
- You see a line like: jdkhome "C:\java\j2sdk1.4.2" -J-Xmx96m -J-Xss1024k -J-Xms24m -J-Xverify:none
- Change the path to your other JDK you wish, like: jdkhome "C:\java\jdk1.3" -J-Xmx96m -J-Xss1024k -J-Xms24m -J-Xverify:none
- That's it, you can compile your applets in a previous version of JAVA so that "older" browser user don't have to install a plugin for the new JAVA environment.
Have fun!
If you have any questions I would be pleased to help you.
If this tip helped you already I would be pleased if you would send me a quick email with your experience.
My email: [email protected]

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Hi,
Verify the 3rd party class files names are correctly written in your program. Sometimes wrong case might be the reason.
bye for now
sat

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If i do
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is it correct?
because it still appeared class not found error..
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Thanks for your responce ...
I had discovered that when I typed "java program name" the java was running from /usr/bin a non-ssl enabled java installation. There was an SSL enabled version under another path on this box and it ran my code fine.

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==============================
type Exception report
message Internal Server Error
description The server encountered an internal error (Internal Server Error) that prevented it from fulfilling this request.
exception
org.apache.jasper.JasperException: Unable to compile class for JSPNote: sun.tools.javac.Main has been deprecated.
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Generated servlet error:
D:\Apps\Apache\Tomcat4.0\work\Standalone\localhost\cartapp\handoff1$jsp.java:56: Class com.cartapp.user.User not found.
com.cartapp.user.User handoff = null;
^
An error occurred at line: 1 in the jsp file: /handoff1.jsp
Generated servlet error:
D:\Apps\Apache\Tomcat4.0\work\Standalone\localhost\cartapp\handoff1$jsp.java:59: Class com.cartapp.user.User not found.
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^
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Generated servlet error:
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^
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at org.apache.jasper.compiler.Compiler.compile(Compiler.java:285)
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=============================================
Location of files
==================
My jsp file is located at:
D:\Apps\Apache\Tomcat4.0\webapps\ROOT\cartapp
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=======================
<jsp:useBean id="handoff" scope="session" class="com.cartapp.user.User" />
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<%
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%>
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==================================
package com.cartapp.user;
public class User {
Environment settings
====================
JAVA_HOME=D:\Apps\java\jdk
CATALINA_HOME=D:\Apps\Apache\Tomcat4.0
CLASSPATH=;.;F:\ola\progmn\JAVA\pkgs;D:\Apps\Apache\Tomcat4.0\common\lib\servlet.jar
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Ola Oke (SCJP 1.4)

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xxxxxxxxxxxxx
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xxxxxxxxxxx
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Methods: 9 public void com.thortech.xl.integration.tenetssh.helper.SSHPrvosioning.SSHInit(...)
xxxxxxxxxxxx
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Khanh

Thanks everyone for your input.
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Edited by: learning_man on Mar 11, 2010 1:27 PM

Learning_man,
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There is nothing in your post other than 'It doesn't work. Why? Help"
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