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

I have launched mgwt showcase demo project to my PC and able to do all
actions what i am seeing on http://mobilegwt.appspot.com/showcase/#
from source code (with Eclipse Helios) . The problem is when I add RPC
in order to contact server (local) getting
com.google.gwt.user.client.rpc.StatusCodeException: 404.
I have taken all the notes/precautions given by techies on "servlet
pattern url" but no luck.

Any other insights and areas to check in mgwt showcase project to make
work PRC.

Thanks in advance !!

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