Hi,
I've been working with identity and access management systems for several years. Some time ago I've developed OAuth 1.0a extension module for Apache CXF. I will be happy to help you with your task. Moreover I am one of the core commiters of the Apache Amber project - Java implementation of the OAuth 2.0 protocol.
Please let me know if you would like to get some more information about my experience.
Cheers, Luke