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Hii, I want to built a web based chat using j2ee at backend logic.i want to implement the similar way the gmail do,so that performance of application doesnr degrade.please suggest what type of architecture shoul i follow.load of application would be high.

A: 

Use what Google used: GWT. They spent years on making it fast and easy to use.

Aaron Digulla
A: 

The Jetty web container has a demo chat application which uses Ajax as the gmail chat does and which is not too complicated to learn.

It appears somebody has a Jetty running on http://64.164.6.244:9090/test/chat/chat.html, so you can see what it looks like before downloading and running it yourself.

Thorbjørn Ravn Andersen