Basic GWT-RPC Application

After stepping through this introduction to a simple GWT-RPC example, I had to experiment a bit to (1) get it running and (2) get some clarity around the naming hooks. What I'll present here is my own variation on that article's code examples, and the understanding I gained around what to keep straight around the names of the various classes and files.

Tip on Specifying GWT-RPC Remote Service Relative Path

Robert Hanson's excellent introduction to a GWT-RPC application got me started, but I bumped into this:

com.google.gwt.user.client.rpc.StatusCodeException:
HTTP ERROR: 404

NOT_FOUND

RequestURI=/relative-path