Apps using Hibernate 3 and 4 should migrate to Hibernate 5, since EAP 7 only supports the newer version. Note that it's still possible to add support for older version, but not recommended. See https://docs.jboss.org/author/display/WFLY10/How+do+I+migrate+my+application+from+AS7+to+WildFly#HowdoImigratemyapplicationfromAS7toWildFly-ApplicationsThatPlantoUseHibernateORM5.0

The Hibernate ruleset must be reworked to target https://github.com/hibernate/hibernate-orm/blob/master/migration-guide.adoc