How can I specify an Oracle connection property when using Spring, Hibernate, and c3p0?

I need to set the oracle.jdbc.maxCachedBufferSize property to limit the amount of memory allocated by Oracle Connections for buffers in its internal buffer cache.  (This was added in the 11.1.0.7.0 Oracle JDBC drivers. See http://www.oracle.com/technetwork/database/enterprise-edition/memory.pdf for more details.)

Thank you, in advance, for your assistance.

-John Hardin