You'll need to configure the Tomcat SSL connector as well, documentation for doing that is here:
The short version:
1) Create a certificate keystore
2) Uncomment line 94-98 of $csinstall/server/conf/server.xml
3) Change your jiveURL property to https and make sure that the port attribute of the Connector element that you uncommented in step 2 matches the port in the jiveURL property.
this worked great for me. I was using jre1.5.0_11 in /usr/java/jre1.5.0_11. I did not have to download anything and was able to generate the cert right there.
Thanks for the concise information and link.