JDBC and ODBC

I have data that I wish to read into PostgreSQL through Java.  I was
wondering about the status of PostgreSQL's JDBC driver, and the
documentation about it (such as is there a driver for Category 1, 2, 3,
or 4).  The only documentation I could find is on the PostgreSQL
website:

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http://www.postgresql.org/docs/postgres/c47.htm

Chapter 47. JDBC Interface

There is a JDBC interface available for Postgres. It is documented
elsewhere using the accepted tool for Java-language code.
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Is this all the documentation there is on PostgreSQL's JDBC drivers?? If
not, where is any other information?

Thanks much,

Jeffrey Napolitano
Software Emancipation Technologies