Embedding Postgres in Java Application

I am developing a desktop GUI application and am using postgres 8. I
need to be able to embed/bundle postgres with my application. To start
with I am releasing on windows with Linux and OSX later.

Is there a way of creating a JDBC connection to the db not over a
network socket?

The other way is going to be to start/stop the database from Java by
calling "pg_ctl start/stop". But that issues with this because of the
windows restrictions that postgres can't be run as a user with admin
privileges. Any Ideas?

Many Thanks

Jasper Potts