Looking to integrate/embed a chat client in a java webapp

Requirements:

• Should be open source.
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• Don't necessarily need to connect to an existing IM server, and can run my own so long as it can run in a Linux OS.
• Needs to support SSO with the app deployed in JBoss.
• Should be able to either skin the chat client to look the same as the app or better still, embed it without any borders or decorators.

Thoughts?

There is a sample chat client with the Jetty webserver you can adapt.