[Pki-users] Best, stable release of Dogtag

Hello, My company is in need of an internal PKI and we're considering using Dogtag. I have tried installing version 10.2.0-5 on fedora 21, following the quick start guide, accepting the defaults and receive only nullPointerException when attempting to use the web UI. I understand that 10.x is alpha so should I be using version 9.x? We do have redhat licenses so I'd really prefer RHEL over fedora. So, what is the best production ready configuration for Dogtag? I just need a PKI that works, preferably with a REST api that can auto-sign certificates. thanks for your help --steve