Is it possible to use concurrent connection pools together with Hibernate?

I have four database users and they must each use a pool of their own - that's the way it is. How should I configurate Hibernate? Any special proposals? Should I use any special features in Oracle? What about server.xml. Is Hibernate a limitation for this kind of solutions?

Hibernate version: 3
Database: Oracle 9i

Thanks.

I'd say either implement your own connection provider, or just manually supply a connection to Hibernate.

I suppose so... Tanks!

One way could be to use four different Servlets - one for each database Role. Perhaps Tomcat (dependent on the loggen in user) could redirect to the correct one???