Spring JPA审核为空已创建

您的（@）Controller类中的方法效率不高。您不想（手动）检索对象并将所有字段，关系等复制到该对象上。除了复杂的对象，您早晚或会遇到麻烦。

您想要的是第一种方法（用于显示表单的GET）来检索用户并将其存储在会话中

@SessionAttributes

@InitBinder

WebDataBinder

updateFromForm

@Controller@RequestMapping("/edit/{id}")@SessionAttributes("student")public EditStudentController    @Autowired      private StudentFormValidator validator;    @Autowired    private StudentRepository studentRep;    @InitBinder    public void initBinder(WebDataBinder binder) {        binder.setValidator(validator);    }    @RequestMapping(method=RequestMethod.GET)    public String showUpdateForm(Model model) {        model.addObject("student", studentRep.secureFind(id));        return "students/form";    }    @RequestMapping(method=RequestMethod.POST)    public String public String updateFromForm(@Valid @ModelAttribute Student student, BindingResult result, RedirectAttributes redirectAttributes, SessionStatus status)   {          // Optionally you could check the ids if they are the same.        if (result.hasErrors()) {   return "students/form";        }         redirectAttributes.addFlashAttribute("message", "?p?t???? p??s????!");        studentRep.save(student);        status.setComplete(); // Will remove the student from the session        return "redirect:/students/list";      }}

您将需要将

SessionStatus

这样，您就不必在对象等周围复制。Spring会进行所有的升举，并且所有字段/关系都将正确设置。