Client Certificate Authentication

I have a PostgreSQL database on a server.  For security reasons, all
client access from outside the server is restricted to certificate mode,
i.e. the client sends SSL certificates rather than a password.
Connecting with pgAdmin works well.  Is there a way of creating a Java
application that connects to this database with certificates?  Any
how-to guides, examples, or pointers on how to achieve this?

Thanks in advance.

-Gabriel