Can server side notify client automatically instead of client refreshing

generally, when we get messages to client, we use refresh requests from server make changes. Dose anyone know in Java has any mechanism that the server can notify client automatically, and dosen't need the client request server initially?
how to implement this?

Thanx, but if not in Http, can java relealize this? For instance, use socket or something else?

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    Hi,
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    Hi,
    It is always recommended to maintain different servers
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    Ravi.

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  • Sockets: How can server detect that client is no longer connected?

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  • Generating feedback messages on server-side vs client-side?

    Hello,
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    Presumably you are not over-engineering in that you
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  • Load Balancing, Server and / or Client ?

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    This question isn't logical at all. You don't execute javascript on the server. But if you want to waste time on it. .. look at Rhino http://www.mozilla.org/rhino/
    Best of luck...

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