Servlet compilation - where to find the class files ?

Hi !
I am new to servlets and I have just downloaded Tomcat 4. I think that a servlet has to extend the HttpServlet class and throws a ServletException exception, right ? But where can I find these classes for Tomcat (I think that these don't ship with it !). I tryed to fix the problem by downloading these classes for JSDK but the Tomcat examples (which I could run) did not compile !...
It is perhaps a silly question, but could someone help me out ?
Thank you

There is a package called servlet 2.3 wich contains all the classe you need to create servlets, you can download it from
http://java.sun.com/products/servlet/download.html

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