1
edit
Changes
→Connection to the driver
: 1- XA JDBC driver for Postgre (needed for NexJ Express Model)
:: XA Data Source, as for what they mean: XA are for distributed transactions (as per the Open Group specificitions) and non-XA are not (transactions must be single-database). [http://www.theserverside.com/discussions/thread.tss?thread_id=21385]
:: Hierarchy for package [http://jdbc.postgresql.org/development/privateapi/org/postgresql/xa/package-tree.html org.postgresql.xa] - src of the hirearchy [http://grepcode.com/file/repository.jboss.com/maven2/postgresql/postgresql/8.3-603.jdbc3/org/postgresql/core/ConnectionFactory.java?av=f]
:: [http://jdbc.postgresql.org/todo.html Bugs]
:: Postgresql Limited XA Support[http://www.atomikos.com/Documentation/KnownProblems#Postgresql_Limited_XA_Support] - PostgreSQL XA support is limited in what it can do; using Postgresql is not recommended and not supported. If you do choose to use it, see this forum post for some of the problems.