使用Spring Boot和Thymeleaf-我无法将数据从模板传递到控制器再传递回模板

Question

New to Spring/REST and getting this error after creating a new attorney, I have an attorney table with a firstName field mapped appropriately. The print statement outputs the current data. I am not sure why the data is not getting to the template. Any suggestions would be greatly appreciated.

org.springframework.expression.spel.SpelEvaluationException: EL1007E: Property or field 'firstName' cannot be found on null

This is my controller:

@RequestMapping(value = "/register", method = RequestMethod.POST)
public Object create(@ModelAttribute Attorney attorney, @Valid Login login, @Valid Firm firm, BindingResult bindingResult, Model model) {
    try {
        if (bindingResult.hasErrors()) {
            model.addAttribute("createdAttorney", attorney);
            model.addAttribute("InitialLogin", login);
            model.addAttribute("firm", firm);
            return "views/register";
        } else {
           // login.setAttorneyEmailAddress(attorney.getEmailAddress());
           // login.setAttorneyId(attorney.getAttorneyId());
            this.attorneyService.save(attorney);
            System.out.println(attorney);
            model.addAttribute("att", attorney);
            return "redirect:/attorney";
        }
    } catch (Exception ex) {
        return "Error Registering " + ex.toString();
    }
}

This is my "redirect: /attorney" info:

 Attorney <p th:text="${att.firstName}"></p> Summary Page

Answer 1

Step 1)

In your html file add <form:form> tag so that you can add model attribute

Step 2)

You should return Model View instead of Object from your controller .

Create ModelView object in your controller and try returning the ModelView

ModelView model=new ModelView();
model.addAttribute("att", attorney);

Step 1 is not mandatory try using Step 2 alone ,if it doesn't work try both

Answer 2

您应该添加

model.addAttribute("att", new Attorney());

Answer 3

您是否不必在方法中返回ModelAndView对象而不是Object？