Using an observer pattern with EJB and AJAX

Question

I want to create an Ajax gui that is notified of any state changes occurring in my ejb application. To achieve this, it seemed to me that I was creating a stateful ejb (3.0) that implements the Observable interface, to which the Ajax client is added as an observer. First, is this possible with Ajax. If so, is this a good design idea or is there a better way to do this?

Thanks in advance!

Greetings

Andreas

Answer 1

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http://directwebremoting.org/dwr/reverse-ajax

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Answer 2

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http://en.wikipedia.org/wiki/WebSockets