The callbacks are "push callbacks" Another question: In the server side, I use the handleCallback() method to send a callback to a client. The handleCallback() method is invoked by my application thread. Is the serialization done by my application thread or another thread is used for the serialization? Is the callback delivered by my application thread or another thread is used for the delivering? what tasks are my application thread used for? Thanx in advance. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4025887#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...