I don't think that JBoss has a socket listener service running within the app (I could be wrong, but I have not come across it yet).

However, what I did was to write a small listener that was also a JBoss client. The app that would accept the socket, get the data, then call a session ejb, get the return information, and send it back down the pipe. It worked really well (don't use it any more, I make the clients use http).