@Component
public class Dao<T> {

    @Resource(name = "sessionFactory")
    private SessionFactory sessionFactory;

    public <T> T save(final T o) {
        return (T) sessionFactory.getCurrentSession().save(o);
    }


    public void delete(final Object object) {
        sessionFactory.getCurrentSession().delete(object);
    }

    /***/
    public <T> T get(final Class<T> type, final Long id) {
        return (T) sessionFactory.getCurrentSession().get(type, id);
    }

    /***/
    public <T> T merge(final T o) {
        return (T) sessionFactory.getCurrentSession().merge(o);
    }

    /***/
    public <T> void saveOrUpdate(final T o) {
        sessionFactory.getCurrentSession().saveOrUpdate(o);
    }

    public <T> List<T> getAll(final Class<T> type) {
        final Session session = sessionFactory.getCurrentSession();
        final Criteria crit = session.createCriteria(type);
        //List<E>
        return crit.list();
    }
}

public class AccountDao extends Dao<AccountEntity> {
 и тут дописываю методы только для AccountEntity
}

    public <T> T merge(final T o) {
        return (T) sessionFactory.getCurrentSession().merge(o);
    }