JBoss AS 7 works with Wicket without any special treatment.

JBoss AS 7 Wicket Quickstarts provide examples of how to use Wicket within JBoss AS 7. https://docs.jboss.org/author/display/AS71/Quickstarts

Also, here is an article about using Wicket and JBoss AS 7 in OpenShift (Red Hat's free PaaS): https://community.jboss.org/wiki/JBossAS7WicketJPAInOpenShiftFreeJavaEEHosting