Servlet jar files

[David DELGRANCHE]

                Hi all,

        I would like to put all my servlet files in a jar file and then put the 
jar file in the classes/ directory. By doing this, Tomcat doesn't find my 
servlet and send me a HTTP 404 error. Does anyone how to specifiy to Tomcat 
that the servlets are in a jar file?
        Thanks a lot
        David.