The closest answer that I got was the following:
The following recommends using the module feature of AS 7. But there is no verification that it might work.
The following process is not a standard approach. Don't know if we can use it.
None of the 'solution' works. Seems like this is not possible and there is no interest in JBOSS to resolve this or provide a recommendation.
I nailed down the JBoss 7.2. remote calls on JBoss4.2.3 - and described it under https://community.jboss.org/wiki/CallingRemoteInterfaceDeployedInJBoss423FromJBoss72
which could be (probably) applied as well to the AS5/6 case in a similar way..
Very nice work Rafal. How well-tested is that?
hi there - thanx,
well its currently used (in dev mode for now - as it has been worked on yesterday/today only) and is actually running (JBoss7.2 calls to JBoss4.2.3 work without any problems so far - only a couple of those being actually used for now but still) - so i suppose the solution is fully workable - the only down side of that solution is that each and every remote method has to be proxied (but that can be worked on in many different ways to be more elastic)