Yes! POJO's would be a good answer, (I think Hibernate's objects are POJO too). Even I was thinking Pojo and JAX-RPC Webservices, but there are another problem: Security. I need Data encription, and digital signing (public/private key) :-(. I not sure about this with Pojo and RPC, but I can do it with SOAP Message ;-).
Thank you.
Wilberto