Hey Noa did you figure out a solution to this problem? I'm running into the same issue myself... I'm not sure what needs to be changed.
No, I didn't find a solution fotr this problem.
Maybe try posting more of your standalone.xml and asking one of the gurus what they think?
I'm seeing similar error messages while I try to deploy a sar with services that use hibernate... but I know my hibernate configuration is JBoss 5.1.0GA centric and not ready for JBoss 7.1.1 yet. If I figure out my problem I'll post it here.