JBossDeveloper

Remove:

{code:xml} <property name="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property>{code}

from your hibernate.cfg.xml file.

Your persistence strategy seems a bit confused. You should either be using JPA configuration via persistence.xml, or Hibernate configuration via hibernate.cfg.xml.

Adding the Spring Framework into the mix is going to muddy the water even further.