Java/Flash based chat system recommendation for a web site

Java/Flash based chat system recommendation for a web site
Since it has been a long time since I had to choose such a specific chat application and I have to quickly come up with some sort of recommendation to my client I would need help in finding out a web site chat application which conforms to following requirements:

1) Java/Flash based since it needs to serve a large number of clients (rough estimation of at least 100-150 simultaneous users online). Independent Java based server would be nice. PHP/AJAX based chat systems would most probably fail when it comes to preserving acceptable timeouts when large number of users are online.

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