I'm not aware of a "global filter" thing in EAP 6.x but from your description you can use "valve" to do the same (basically the same as "valve" in tomcat)
You can :
1) write a custom valve class(es)
2) package your valve class(es) as a custom module and config it as global module
3) config global valve in JBoss configuration file "standalone.xml"
example of configuring a valve:
thanks for your detailed answer!
I'll try it, i hope i am able to log the whole request/response (post data, content, ...) with a custom valve, because the predefined valve classes don't provide those functionality.