spring+hibernate开发问题!

public class StudentDAO extends HibernateDaoSupport implements IStudentDAO{
    private SessionFactory sessionFactory;    static Transaction tx = null;
    static Logger log = Logger.getLogger(StudentDAO.class);
    public void savepeople(people id)
    {
    this.getHibernateTemplate().save(id);
    }}去掉 private SessionFactory sessionFactory;    static Transaction tx = null;