Is the following possible using Spring's remoting support?
The client A connects to the server S using remoting (RMI, burlan, hessian, ...) and registers itself (so the connection stays open).
The client B also connects to server S the same way.
Can the server S send a message to the client A telling him that B registered?
This without A having to poll or A having to set up it's own server (which won't work as A and B have a firewall blocking incoming connections).
Over basic RMI this works: the connection stays open and A registers itself on S so S has a reference to A to call him.