Right now the core depends on:
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate</artifactId>
<version>3.2.6.ga</version>
</dependency>
Furthermore, org.hibernate:hibernate is a banned dependency in AS https://jira.jboss.org/jira/browse/JBAS-6904
Move to org.hibernate:hibernate-core 3.3.1.GA