[FIXED] Getting data by form and pass to controller

Issue

I want to take an id as input by the user and pass to the controller to get the data of particular id

it's working when I pass id manually in URL -- http://localhost:8080/student/1

<form th:action="@{{student}/{id}}" th:object="${Student}" method="post">
                    Roll Number:<br>
                    <input type="text" th:field="*{id}"><br>
                    <br><br>
                    <input class="button" type="submit" value="Submit">
 </form>

@GetMapping(value = "/student/{id}")
    public Optional<Student> getStudentDetail(@PathVariable int id){
        return studentRepository.findById(id) ;
    }

Whitelabel Error Page This application has no explicit mapping for /error, so you are seeing this as a fallback.

Wed Jun 19 11:04:22 IST 2019 There was an unexpected error (type=Internal Server Error, status=500). An error happened during template parsing (template: "class path resource [templates/student.html]")

Solution

change as AmirBll said, Also, you have to change your controller HTTP method from @GetMapping(value = "/student/{id}") to @PostMapping(value = "/student/{id}") as form data submission is POST method you declared in the form.

Answered By - user404