Data Structure between client and server

I have just started working with GWT, for an University Project. I
have to create a classic client-server sistem.
The client and the server must communicate exchanging some
information.
The server uses data structures to maintain a user model and to
execute basic internal functionalities.
The client uses similar data structures to maintain alignment with the
model in the server.
Is it a good idea to have the client and the server use the same data
structures, and use these structures as the information exchange,
putting them in the shared package, or would it be better to use a
different set of data structures?
Which is the best and commonly solution to this problem?
Thanks in advance

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