Calling Applet from a Form

I'm working on an applet that is called by an HTML form. I was wondering
if it's legitimate to call the class file right form the form tag as follows:

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<form action="http://canada.watsonwyatt.com:4620/InfoSource/DBTextAppletNew.class"
method="POST">
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I've tried doing this, but it's giving me the following error:

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Server Error

This server has encountered an internal error which prevents it from fulfilling
your request. The most likely cause is a
misconfiguration. Please ask the administrator to look for messages in the
server's error log.
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I don't know what that means. Any input would be greatly appreciated.

Thanks in advance.

-Abinaash