I have written a game in PlayN, which has to communicate with a JavaEE-Server with Seam. First of all I only need the game running in HTML5.
The current issue is the
I think the problem is that you are "running" PlayN, separated from your Seam server.
If I understood you correctly, you execute the Maven task to run your game as HTML and on the other hand you run Jboss (or whatever Java EE server), what you should do is run
mvn package
which will create the war of the game, and then publish that war on your Java EE server, then you can use the PlayN.net package with no problems whatsoever, running in a single server