Does it work for you if you create the same project out of JBoss Central using "JavaEE Project" archetype (org.jboss.spec.archetypes:jboss-javaee6-webapp-ear-archetype:7.1.1.Beta3) and then run it on JBoss AS 7.1.1.Final?
Works for me for both in JBoss Tools 3.3.1 with Open JDK6 and in latest nightly JBoss Tools 3.4.0 with Open JDK 6/7 under Ubuntu 12.04 LTS 64-bit.
What is the full as log?