I would prefer a normalized database as I have stated before. By normalized I mean.. just having these fields on the table. On my understanding these tables are the tables for our current JMS implementation. (look at those table names... JMS_message, JMS_reference ...) Adding a new field on the database doesn't mean you are adding dependency to your code. The day we need another system, we will change the JDBCPersistenceManager or implement a new one. To me JDBCPersistenceManager is like a hibernate that maps our columns to databases. If some day we need extra data... we change the persistenceManager. If some day we have pluggable systems... I would say we will implement plugable persistence managers. and having columns created according to what's plugged/needed. So.. in another words... if we have a new system... we just implement a new PersistentManager View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4011982#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...