Query regarding Tomcat 6.x AIO

Hi all,
I am creating a real-time web-based chat client and for that I am using AIO feature of Tomcat 6.x. Apache AIO. I am also java XMPP libraries to connect to XMPP based web services like gtalk. When the first request is received by the servlet it gets blocked until data is received from other side. I am using the first request to send the presence message to all other clients. Now the second request carries the chat message written by the user to all other clients. The problem is when the client receives message from the other side I send the first request back with the chat message to the user. Now since there is no connection to the server the user is signed out of the chat server. Now again I have to send a request which signs in the user and then blocks until further messages are received from other clients.
This causes the user to sign in and out frequently......

Please help me out