I want to make a chatroom using jsp, and have some problem, Help!

I want to build a chatroom using jsp and client using plain html, so i need every client could have a constant connection with the web server and will receive messages realtime. But i got 2 problems.
First, how can i turn my buffers off so that messages can get to the client the time it is meant to be. I added
<@page buffer="none">
but seems that it takes no effect, any tricks here? thx
Second, I want every user could have a constant conn. with server but i dont want my server to waste resources on those connection that has already been disconnected.so is it possible to stop executing JSP pages once client has diconnected.Since i found that it will throw no exception writing to the client even if the connection is disconnected in JSPs.
Thanks!!!!!

By theway, i'm using TOMCat 5.0 as my JSP container.

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import javax.servlet.http.*;
import javax.servlet.*;
import java.io.*;
import java.util.*;
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Cheers ,
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