Getting data by form and pass to controller

Question

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]")

user404 · Accepted Answer · 2019-06-19 06:07:39Z

1

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 Jun 19, 2019 at 6:07

user404

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Comments

Mohit Sharma · Accepted Answer · 2019-06-19 06:12:05Z

1

In the form attribute you have used method="post" while in the controller class you are using @GetMapping. Use this

<input type="text" th:field="*{id}">

instead of

<input type="text" th:="*{id}"><br>

Also make getter / setter of id attributes in the Student class

answered Jun 19, 2019 at 6:12

Mohit Sharma

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5 Comments

Abhishek Shukla Over a year ago

java.lang.IllegalStateException: Neither BindingResult nor plain target object for bean name 'Student' available as request attribute

Mohit Sharma Over a year ago

try with th:object="${student}" instead of th:object="${Student}". Also the Student class must be under package which used in @ComponnetScan

Mohit Sharma Over a year ago

can you please confirm that Student form bean is being loaded in the application context

Abhishek Shukla Over a year ago

No, it is not loaded in the application context

Mohit Sharma Over a year ago

load this Form Bean class in the applicationContext, looks like the issue related to the non-availability of bean

AmirBll · Accepted Answer · 2019-06-19 05:45:51Z

0

you should use th:field for <input>:

<input type="text" th:field="*{id}">

answered Jun 19, 2019 at 5:45

AmirBll

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2 Comments

Abhishek Shukla Over a year ago

Whitelabel Error Page This application has no explicit mapping for /error, so you are seeing this as a fallback. Wed Jun 19 11:27:55 IST 2019 There was an unexpected error (type=Internal Server Error, status=500). Error during execution of processor 'org.thymeleaf.spring5.processor.SpringInputGeneralFieldTagProcessor' (template: "student" - line 16, col 40)

Abhishek Shukla Over a year ago

by using <input type="text" th:field="*{id}">

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