Well, since support for JBoss AS 7.1 was dropped but the getting started guide at http://arquillian.org/guides/getting_started/#test_across_containers still suggests it is supported (since the quick start still tells you it should work) it looks like an issue with the getting started guide. Migrating that guide to, say, some Wildfly version would be a fix as well.

I asked someone at the RedHat booth at last week's Devoxx conference (didn't catch his name, he was about to head out) and he told me in the future this will be "fixed" via a new project called cameleon (I think). That is supposed to fix the issues Arquillian has with regard to support of different AS versions. In light of that I don't think Arquillian will get back support for JBoss AS 7.1 other than via this project - if at all.