GWT and Hibernate

Hi, I started to use GWT with Google App Engine (GAE) and did all the
pages and navigation between them. I also have another project when I
use hibernate. So, I have the following scenario: GWT as presentation
layer and this other project as business logic. I use RPC to make the
calls betweend them.

My point is: I tried a simple transaction to validate the user login
and the project returns the following error: "Error while registering
Oracle JDBC Diagnosability MBean".

I have search on the net about this error and I have found that I
cannot use hibernate and GAE together. So I disabled the GAE at my GWT
project properties and the page stops loading.

Question: is there a way to use hibernate only to make simply queries?
I don't want to traffic hibernate objects between the projects. I only
need to make the query, process the result to native objects and send
them back to the GWT project.

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