Implements keyword

Hi!
Would somebody help me?... I have a servlet that it use a implements
keyword, like this:
public class nameservlet implements Servlet, ServletConfig

but I have a problem because when I want to call the servlet, the
browser couldn't find it, it returned a 404 Not Found error message.
I checked the code and it is right, so,  somebody told me the implements 
keyword isn't supported for that version. I have jkd1.1.8 and websphere.
I know that implements and interface are complements, don't I?

Thanks for advance!!

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