Hibernate version: 2.1.8

I've been working on a hibernate 2.1.8 application that has been running fine on Jboss 3.2.8 for some time. For a client requirement, the final production server must be OC4J, in which we have succesfully deployed the app not without doing some changes, but right now we've tested it non-clustered.

The questions are:

- Has anybody used second-level cache in an OC4J clustered environment?

- Does anybody know what type of cache OC4J uses? is it supported by hibernate?

- For this particular hibernate version I understand there are some deadlock issues with jboss cache (read: http://wiki.jboss.org/wiki/Wiki.jsp?page=JBossCacheHibernate), but the version update for now is not an option. What cache solution do you recomend? (SwarmCache doesnt look like an option, since its last update dates from 2003)

- Would someone recomend having a clustered hibernate app which does not replicate cache over the network?

Any help is appreciated! Thx so much.