PostgreSQL
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Preparing the Database for JDBC

Because Java can only use TCP/IP connections, the Postgres postmaster must be running with the -i flag.

Also, the pg_hba.conf file must be configured. It's located in the PGDATA directory. In a default installation, this file permits access only by Unix domain sockets. For the JDBC driver to connect to the same localhost, you need to add something like:

host         all         127.0.0.1     255.255.255.255   password

Here access to all databases are possible from the local machine with JDBC.

The JDBC Driver supports trust, ident, password and crypt authentication methods.