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There are three base components for GWT RPC (essentially steps):
1. Client and Server Side shared interface
RemoteService – shared interface
2. On the Server Side the servlet class is implemented.
It handles serialization of data between client and server.
RemoteServiceServlet
3. Client Side, create asynchronous interface, used to handle normal
ajax like callback method.
4. GWT creates the need interface and proxy via GWT.create() method.
ServiceDefTarget – interface on client is automatically generated on
compile.