Hibernate Criteria with Spring Data JPA

MessageDaoJpa.java

@Repository("messageDao")
public class MessageDaoJpa implements MessageDao {

    @PersistenceContext
    private EntityManager entityManager;
    
    ...
    
    public Message get(final String key, final String target) {
        Criteria criteria;
           
        Session session = entityManager.unwrap(Session.class);
        criteria = getSession().createCriteria(Message.class);
        criteria.add(Restrictions.eq("key", key).ignoreCase());
        if (target != null) {
           criteria.add(Restrictions.like("target", target, MatchMode.ANYWHERE).ignoreCase());
        }
        
        return (Message) criteria.uniqueResult();        
    }
       
}