Any good Hibernate second level cache provider, for production environment?

[Jaikiran Pai]

Hi,
We have a J2EE application on JBoss-3.2.3 with Hibernate-2.1.3 deployed as a MBean. We have enabled second-level cache on the hibernate object and are using JBossCache1.2 for the same. The cache-usage is "transactional". Currently, we are facing a lot of issues in case of multi user scenario related to JBossCache(pessimistic locking issues).

So, can anyone suggest any other cache provider(that can be used as "transactional") that can be used with Hibernate, in production environment?

Thank you.