Need Java sample code for switching between proxy sessions

Hello everyone,

I want to use the proxy authentication and lightweight session feature possible with Oracle 9i. I'd like to create several proxy user sessions on one db connection in Java (that's described for one user session in http://otn.oracle.com/sample_code/tech/java/sqlj_jdbc/files/9i_jdbc/OCIMidAuthSample/Readme.html) and then switch between several such user sessions. However, I cannot find any documentation on OTN how to do this in Java/JDBC. The only sample code I could find for this is in C (in the cdemoses.c file available at http://otn.oracle.com/sample_code/tech/oci/content.html)

Has anyone done this before and can show me their code?

Thanks for your help,
Holger.

-- 
Dr. Holger Peine
Fraunhofer IESE, Kaiserslautern, Germany
Phone +49-6301-707-134, Fax -200 (shared)
www.iese.fraunhofer.de/Staff/peine -- PGP key on request or via pgp.mit.edu