hibernate+jsp工程里的 saveCustomer，session.save()方法，一直有错误

[BestMExmq]

 protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

        String name=new String(request.getParameter("name").getBytes("ISO-8859-1"),"utf-8");
        String address=new String(request.getParameter("address").getBytes("ISO-8859-1"),"utf-8");
        String id=request.getParameter("id");
        System.out.println(name+address+id);

        PersonEntity person=new PersonEntity();
        System.out.println("person已建立！！");
        person.setName(name);
        person.setId(Integer.parseInt(id));
        person.setAddress(address);
        saveCustomer(person);
        request.setAttribute("info","注册成功！！！");

        request.getRequestDispatcher("result.jsp").forward(request,response);
    }

    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

    }
    public void saveCustomer(PersonEntity aa) {
        Session session = null;
      try {
          session = HibernateUtil.getSession();
          session.beginTransaction();
          session.saveOrUpdate (aa);
          session.getTransaction().commit();

      }
        catch(Exception e)
        {
            e.printStackTrace();
            session.getTransaction().rollback();
        }
        finally
        {
         session.close();

        }
    }
}

[BestMExmq]

求帮助啊，搞了好久了。

[街头小贩]

有什么错误？找不到问题 多打印输出或debug一下

[BestMExmq]