PostgreSQL supports more than just that including:It means that you can create stored procedures/functions which reside in the database that are written in java (as opposed to the native SQL programming language).
Why would you want this? If you were more familiar with java than any of the currently supported procedural languages, then it means that you don't necessarily have to get to grips with another programming language.
This would be a "nice to have" for Postgres too - I believe that it supports PL/pgSQL, PL/Tcl, PL/Perl, and PL/Python at present.
pl/php pl/perl pl/ruby pl/python pl/tcl pl/c pl/pgsql pl/r plr/bash (I think... or was that just pgBash?)
There was an beta (alpha?) of pl/Java at one time...
Personally I would stick with pl/python, pl/php, or pl/perl
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