I was getting errors(unable to find valid certification path to requested target) in Alfresco trying to connect to LDAP over ssl using an untrusted certificate and found a great hint on the interwebs that I thought I'd share.
Most of the hits on google mention this post: http://blogs.sun.com/gc/entry/unable_to_find_valid_certification
My only criticism of that article is that it only minimally addresses how to actually use the fixed keystore. I downloaded their source and hacked it up a little change the name of the certificate store from "jssecacerts" into "cacert" which is the default certificate store for all java programs. My goal was to fix the certificate store for the entire machine.
To install an untrusted certificate into your keystore the process is like this: