Tomcat v4.1 - Resource not found 500 Error - Help!

Hi,
I am a bit new to Tomcat, but have a really quick question. I am trying to deploy a new single class file to an existing Tomcat 4.1 web application, however, I am using Rational Application Developer 7.0 to create and compile the class. When I deploy the new class to the Tomcat 4.1 web application, the page crashes with a 500 error "Resource not found".
What could be causing this error? When I put the old class back in everything works ok. I have even tried using identical code, so I know it isn't a coding issue. Could it be the JRE being used to compile the class is the wrong type?
Any help would be much appreciated!
Thanks :)

Can you please provide the full error message and stack trace if possible?
Could it be the JRE being used to compile the class is the wrong type?Yes it definitely could be.
What version of java is tomcat running on?
You can find out with the following jsp fragment:
Working with server: <%= application.getServerInfo() %><br>
Servlet Specification: <%= application.getMajorVersion() %>.<%= application.getMinorVersion() %> <br>
JSP version: <%= JspFactory.getDefaultFactory().getEngineInfo().getSpecificationVersion() %><br>
Java version: <%= System.getProperty("java.version"); %><br>

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Hi all,
I'm novice to J2EE.
You're also a novice to this forum.
First, turn off the bold font.
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either 505 - resource not found error(http://localhost:7001/Suresh-2/Suresh) or 404 - not found error.( http://localhost:7001/Suresh-2/Suresh)
If you're correct, and it's deployed, that would suggest that the URL you gave is incorrect.
>
Now let me elaborate what i've done till now.Good info - almost too much.
%

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