org.springframework.beans.BeanInstantiation

Question

我正在使用弹簧靴。我的道实现是：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;    }当我保存数据时使用这些，然后我得到错误：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请参阅问题。并帮助我解决问题。

Answer 1

您正在尝试混合使用 作为控制器参数并使用 . 当您有一个包含来自传入请求的参数的表单对象，并且您希望 Spring 将这些参数复制到该对象的实例中时，将使用该对象。将表单对象用于 POST 映射（一个好主意），或者删除注释以使用 。Model@ModelAttribute@ModelAttributeModel