Peter Johnson [http://community.jboss.org/people/peterj] replied to the discussion "trouble with deployment please help" To view the discussion, visit: http://community.jboss.org/message/533371#533371 --------------------------------------------------------------      >>*I would also like to know if there is no recommended default based on  version of postgresql being used* No, it is all based on the functionality you require, not on the database level. You should read the docs which contain a complete description of the 3 different types of transactional settings you can specify in the *-ds.xml file. *>>Additionally i would appreciate if someone could explain the optional  "<!-- corresponding type-mapping in the standardjbosscmp-jdbc.xml  (optional) -->* This setting is used by EJB 2.x for Container-Managed Persitence (CMP). The value for <type-mapping> must match one of the entires in the server/xxx/conf/standardjbosscmp-jdbc.xml file. -------------------------------------------------------------- Reply to this message by going to Community [http://community.jboss.org/message/533371#533371] Start a new discussion in EJB 3.0 at Community [http://community.jboss.org/choose-container!input.jspa?contentType=1&...]