in short: no.
If you don't replicate your persistence (the db) yourself, we won't do it for you!
Consequently, you need to share a database with each replicated node i.e. each node of the cluster need to have access to the same database. If you need, you can use a clustered database (like Oracle) but this is not in JBoss scope.
Don't forget that beans are just a view of persisted data.
Thank you for the clarification.