What is a code point in Java RMI?

I am currently studying RMI.

I really don't understand the concept of a codebase. Each article I read suggests that the client that calls the Remote object can load method definitions from the code base. The problem is that I don't need descriptions / interfaces in my classpath? How can I call methods on a remote object if I only know them at runtime? It does not even compile.

Am I really not lost here? What is a code base point? There seems to be a lot of extra work and requirements to provide a codebase

thank