Create Chat in WebApplication Java -

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i have java web application servlet , java class in backend, , ajax , jsp in frontend deploy on tomcat6. create chat service users of application. kind of technology can use?

i have jsp footer.jsp common other jsp page, in jsp create popup facebook chat comunication. have in hashmap of context application user logged, don't know how create java listner send , recive message user logged , other. kind of technology must use create backend , frontend listner?

it depends on know / want learn , functionallity application should have... why not add current application ? use jsp front end, use ajax communication - servlet server .....


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