JDBC type mappings

Google is able to find JDBC type mappings for every popular DB other then PostgreSQL and they all vary greatly:

    http://dev.mysql.com/doc/refman/5.0/en/connector-j-reference-type-conversions.html
    http://publib.boulder.ibm.com/infocenter/db2luw/v8/index.jsp?topic=/com.ibm.db2.udb.doc/ad/rjvjdata.htm
    http://download.oracle.com/javase/6/docs/technotes/guides/jdbc/getstart/mapping.html

The closest I could find for PostgreSQL would be manually going though the source or JavaDoc
http://jdbc.postgresql.org/development/privateapi/index-all.html

possible@irc://freenode/postgresql  recommended I ask here first.

Anyone know what the JDBC type mappings for PostgreSQL are?