transfer Objects between GWT and EJB

Hello,

I have got a question because of the architectur of my project.
At the one side there is a GWT Package with the Client Side and also a
Servlet to communicate with an EJB Project.
On the other Side there is a EJB Project with Session Beans and
Entities which schould be stored in a database and send between GWT
Client and the database. But I don't know how I can realize that. how
can I send an Object from my Session Bean to the GWT Servlet, because
the GWT Servlet don't know about the Entitities Classes.

Thats my Project Structur:

Entities + Session Bean:
http://pastebin.com/anAbCqgd

GWT Servlet:
http://pastebin.com/Ujjka9vT

I hope that it is clear where my problem is ;)

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