Need advice in writing forum component for a GUI application

Hello,
I need to write a forum component for a GUI application, that is a visual component that would have all the usual forum functionality - creating threads, posting replies, editing, logging in, etc. I'm planning to use some existing forum engine on a JBoss/Tomcat server. So I do not need a web-interface for a forum, but I need find some engine written in java with a clear interface that I could use in my app. I tried JForum (http://www.jforum.net) first, but it seems it doesn't have open API I could utilize.
Could anyone please suggest appropriate engine, possibly anyone knows of open-source forum GUI apps I can look at?

Google? You've never heard of Google? Seriously? Did you just get Internet access yesterday?
http://www.google.com

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