我正在使用彈簧靴。我的道實(shí)現(xiàn)是：public void saveDetails(Proforma_Invoice proforma) {    Session session = null;    Transaction tx = null;    try {        session = sessionFactory.openSession();        tx = session.beginTransaction();        session.saveOrUpdate(proforma);        tx.commit();    } catch (Exception e) {        e.printStackTrace();    } finally {        if (session != null && session.isOpen())            session.flush();        if (session != null && session.isOpen())            session.close();    }}我的控制器是： @RequestMapping(value = "/enquiry", method = RequestMethod.GET)    public ModelAndView getEnquiryScreen(Model model, Item_entity item, Integer item_code, vendor_entity vendor) {        System.out.println("Controller is starting..");        ModelAndView mav = new ModelAndView("enquiry_Screen");        return mav;    }    @RequestMapping(value = "/enquiry", method = RequestMethod.POST)    public ModelAndView demo(@ModelAttribute("enquiry") Model model, Item_entity item, Integer item_code,            vendor_entity vendor, Proforma_Invoice proforma) {        System.out.println("Controller is starting..");        ModelAndView mav = new ModelAndView("enquiry_Screen"););        return mav;    }當(dāng)我保存數(shù)據(jù)時(shí)使用這些，然后我得到錯(cuò)誤：2019-03-12 09:45:34.352 ERROR 7256 --- [nio-8080-exec-3] o.a.c.c.C.[.[.[/].[dispatcherServlet]    : Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception [Request processing failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.springframework.ui.Model]: Specified class is an interface] with root causeorg.springframework.beans.BeanInstantiationException: Failed to instantiate [org.springframework.ui.Model]: Specified class is an interface請(qǐng)參閱問(wèn)題。并幫助我解決問(wèn)題。