I have tried to poke around to find out if AS7 supports WebSockets, but haven't find any resources.
Am I able to upgrade HTTP connection to Servlet running on AS7 to WebSockets connection, similarly to Jetty? 
If no, is it planned to implement this feature?
Great to see, that the work on the WebSockets support is started.
But in case you want a solution (workaround) which works (only for a single application in JBoss) with current JBoss versions, take look at http://golovnin.blogspot.de/2012/04/jboss-7-and-websockets.html.