According to the document, with JBoss Messaging 1.2, the destinations have a dependency relationship with Queue or Topic PostOffice. However, looking at the xxx-persistence-service.xml files, it seems like if PostgreSql or Oracle is used as the persistence store, instead of PostOffices, the DirectExchange and TopicExchange mbeans will be deployed. Is this how the final implementation going to be? Or is it going to be PostOffices regardless of which database is used?