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→PostgreSQL Specifications
: 1- XA JDBC driver for Postgre (needed for NexJ Express Model)
:: Hierarchy for package [http://jdbc.postgresql.org/development/privateapi/org/postgresql/xa/package-tree.html org.postgresql.xa]
:: 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.::PogreSQL PostgreSQL HeuristicMixed Exception [http://www.atomikos.com/Documentation/KnownProblems#PostgreSQL_HeuristicMixed_Except] - On PostgreSQL make sure to set the max_prepared_transactions at least as high as the max_connections, or you get heuristic problems.
: 2-Simple JDBC driver for Postgre
::JDBC Driver 4 for PostgreSQL 9.This is the current version of the driver. Unless you have unusual requirements (running old applications or JVMs), this is the driver you should be using. It supports Postgresql 7.2 or newer and requires a 1.4 or newer JVM. It contains support for SSL and the javax.sql package. It comes in two flavors, JDBC3 and JDBC4. If you are using the 1.6 JVM, then you should use the JDBC4 version.
