Why @PostMapping redirect to @GetMapping?-CodePudding

@GetMapping("/{id}")
    public ModelAndView getPersonById(@PathVariable("id") String id) {

        ModelAndView modelAndView = new ModelAndView();
        Person person = personCache.getById(id);

        modelAndView.setViewName("/author.jsp");
        modelAndView.addObject("id", person.getId());
        modelAndView.addObject("lastName", person.getLastName());
        modelAndView.addObject("firstName", person.getFirstName());
        modelAndView.addObject("secondName", person.getSecondName());
        modelAndView.addObject("phone", person.getPhone());
        modelAndView.addObject("hobby", person.getHobby());
        modelAndView.addObject("bitBucketUrl", person.getBitBucketUrl());
        return modelAndView;
    }

@PostMapping("/create")
    public ModelAndView create(@RequestParam("id") String id, @RequestParam("lastName") String lastName,
                               @RequestParam("firstName") String firstName, @RequestParam("secondName") String secondName,
                               @RequestParam("phone") String phone, @RequestParam("hobby") String hobby,
                               @RequestParam("bitBucketUrl") String bitBucketUrl) {

        ModelAndView modelAndView = new ModelAndView();
        personCache.create(Person.builder()
                .setId(id)
                .setFirstName(firstName)
                .setLastName(lastName)
                .setSecondName(secondName)
                .setPhone(phone)
                .setHobby(hobby)
                .setBitBucketUrl(bitBucketUrl)
                .build());

        modelAndView.setViewName("/create.jsp");
        modelAndView.addObject("id",id);
        modelAndView.addObject("lastName", lastName);
        modelAndView.addObject("firstName", firstName);
        modelAndView.addObject("secondName", secondName);
        modelAndView.addObject("phone", phone);
        modelAndView.addObject("hobby", hobby);
        modelAndView.addObject("bitBucketUrl", bitBucketUrl);
        return modelAndView;
    }

I'm at studying the spring boot app. I want to create an object Person on the page with the URL "localhost:8080/author/create". So, when I type into the browser "localhost:8080/author/create", I'm waiting that my app to go to @PostMapping, but the app redirects to @GetMapping with URL "localhost:8080/author/create". Because "id" with value "create" doesn't exist, I catch a NullPointerExecption in this line:

modelAndView.addObject("id", person.getId());

Error in browser:

Whitelabel Error Page
This application has no explicit mapping for /error, so you are seeing this as a fallback.
There was an unexpected error (type=Internal Server Error, status=500).

How can I realize "create" page?

CodePudding user response：

Browser address bar sends GET requests. You can use smth like Postman to send requests which you need.

CodePudding user response：

By default browser does get-requests only, so create another controller method with get-mapping and add person object to the model so that you can set values in the view page and when you press submit give post-mapping so that you can assign values that are entered in view page to the person object.