在Spring MVC上执行POST请求时，HTTP状态415 –不支持的媒体类型

Question

I am trying to send a post request on a simple Spring MVC web app and use RequestBody in my controller to convert the JSON into a Java Object but for whatever reason, I keep getting HTTP Status 415 – Unsupported Media Type . I have spent a lot of time trying to find a solution to this but nothing seems to be working.

The get method in my Controller seems to be working fine. This is my original code

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.*;

@Controller
@RequestMapping(value = "/users", method = RequestMethod.POST)
public class MyControllerAgain {

    @RequestMapping(method = RequestMethod.POST, consumes = "application/json")
    public void handleJson(@RequestBody Contact c) {
        System.out.println(c);
    }

    @RequestMapping(method = RequestMethod.GET, consumes = "application/json")
    public void handleGet() {
        System.out.println("a");
    }
}

This is my Contact

public class Contact {

    int id;

    public String name;

    public int number;

    public Contact(){}

    // Getters and setters
}

I am sending a request with Postman and this is what it looks like

POST /users HTTP/1.1
Host: localhost:8080
Content-Type: application/json
Accept: application/json
Cache-Control: no-cache
Postman-Token: 511c9e03-4178-380d-58f8-db24a3245b9e

{
    "id":1,
    "name":"something",
    "number":1
}

I have also tried including Jackson dependencies in my pom.xml . I have tried altering consume value in @RequestMapping annotation and I have tried all combinations of headers accept and Content type in my request.

Also, If I use @ModelAttribute instead of @RequestBody , then everything works fine except all the fields in Contact class are null.

Here is the github link - https://github.com/Sanil2108/test_springmvc

Answer 1

To me it looks like that the jpa anotations are messing up the json deserialization.

The error returned from the spring server could be misleading. Try using plain object with setters and getters and see if this changes anything. You should search for some exceptions in the logs.

Answer 2

Add a mapping to the handleGet method, for example:

@RequestMapping(value = "/get", method = RequestMethod.GET, consumes = "application/json")
public void handleGet() {
    System.out.println("a");
}

--UPDATE--

Remove the consumes = "application/json" part from you GET call. It sees that both requests that listen to "/users" can consume json data, but one is a GET and the other one is a POST.

--2nd UPDATE-- This will definitely work. Tested.

@RestController
@RequestMapping(value = "/users", method = RequestMethod.POST)
public class ContactController
{
    @RequestMapping(method = RequestMethod.POST, consumes = "application/json")
        public void handleJson(@RequestBody Contact c) 
        {
           System.out.println(c);
        }
}

Answer 3

RequestMapping annotation not only has the consumes but also produces .

But to avoid all these settings for HTTP REST, you can use RestController annotation and GetMapping , PostMapping etc..

You can find an example in my github

Answer 4

Tried everything but couldn't it to work. Maybe I was making a silly mistake somewhere or there was something seriously wrong with my configuration. Anyway, I tried to make it work with Spring boot and it worked fine. For anyone who is interested, Here is the github link - https://github.com/Sanil2108/spring_hibernate/tree/master/spring_boot1

Also, thanks to everyone who tried to help!