We're going to implement a jar on one of our virtual hosts. The virtual host has it's own SSL certificate from GeoTrust.

Is it possible to sign a jar with the GeoTrust certificate so that when users access the page with the jar, they are able to see that the virtual site has 'authorized' it via it's jar signature?

This should get you moving in the right direction.

http://www.thawte.com/ssl-digital-certific...e/nsobject.html