I need to perform web service calls from within my own web server running on Apache/Tomcat. Apache/Tomcat running on Linux needs to make calls out to a Microsoft server running IIS over HTTPS that uses an internal Certificate Authority (CA) for SSL.

How do I get Apache/Tomcat to trust the proper root certificate from this CA?

Also, how do I test that this trust is working? I assume a browser request from the server hosting Apache/Tomcat is insufficient.