Spring Boot Content type 'text/plain' not supported in POST request in terminal

Question

I have an application in spring boot. I created a post request to accept a string and to spit out a JSON in a text file. I am using @RequestBody as a Map. I'm not sure if I am utilizing that properly and that is the reason I am getting the error?

When I try to do

curl -d "ncs|56-2629193|1972-03-28|20190218|77067|6208|3209440|self|-123|-123|-123|0.0|0.0|0.0|0.0|0.0|0.0|0.0"
 -H 'Content-Type: text/plain' 'http://localhost:9119/prediction'

It gives me this error

status":415,"error":"Unsupported Media Type","message":"Content type 'text/plain' not supported","path":"/prediction"

This is my controller class

import java.io.IOException;
import java.util.HashMap;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.http.HttpStatus;
import org.springframework.http.ResponseEntity;
import org.springframework.validation.annotation.Validated;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RestController;

@Validated
@RestController
public class MockController {

    @Autowired
    MockEndPoint mockendpoint;
    @Autowired
    MockConfig mockconfig;

    String w;
    String x;
    String y;
    String z;

    @RequestMapping(value = "/", method = RequestMethod.GET)
    public String index() {
        return "hello!";
    }

    @RequestMapping(value = "/prediction", method = RequestMethod.POST, produces = {"application/json"},consumes= "text/html")
    public ResponseEntity<String> payloader1(@RequestBody HashMap<String,String> params ) throws IOException{

        params = mockconfig.getHashmap();

        if(params.containsKey(mockconfig.input1))
            w  = mockconfig.input1;
            String[] a = w.split("\\|");
            if (a.length == 18) 
        {
                return ResponseEntity.ok(params.get(mockconfig.input1)); 
        }
        else {
            return ResponseEntity.status(HttpStatus.BAD_REQUEST).body("Inccorect payload amount(18 parameters required");
        }



    }


}

This is my endpoint class

import java.io.File;
import java.io.IOException;
import java.nio.file.Files;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.util.ResourceUtils;

@Configuration
public class MockEndPoint {





    @Bean
    public String Payload1() throws IOException {
        File file = ResourceUtils.getFile("src/test/resources/Payload1.txt");
        String content = new String(Files.readAllBytes(file.toPath()));
        return content;
    }


    @Bean
    public String Payload2() throws IOException {
        File file = ResourceUtils.getFile("src/test/resources/Payload2.txt");
        String content = new String(Files.readAllBytes(file.toPath()));
        return content;
    }
    @Bean
    public String Payload3() throws IOException {
        File file = ResourceUtils.getFile("src/test/resources/Payload3.txt");
        String content = new String(Files.readAllBytes(file.toPath()));
        return content;
    }
    @Bean
    public String Payload4() throws IOException {
        File file = ResourceUtils.getFile("src/test/resources/Payload4.txt");
        String content = new String(Files.readAllBytes(file.toPath()));
        return content;
    }


    }

This is my config class

import java.io.IOException;
import java.util.HashMap;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Configuration;

@Configuration
public class MockConfig {

    @Autowired
    MockEndPoint mockendpoint;

    String input1 = "ncs|56-2629193|1972-03-28|20190218|77067|6208|3209440|self|-123|-123|-123|0.0|0.0|0.0|0.0|0.0|0.0|0.0";
    String input2 = "ncp|56-2629193|1955-11-28|20181213|73630|6404|182232|self|-123|-123|-123|0.0|0.0|0.0|0.0|0.0|0.0|33.35";
    String input3 = "ncp|56-2629193|1955-11-28|20190103|73630|6404|182232|self|-123|-123|-123|0.0|0.0|0.0|0.0|0.0|0.0|33.35";
    String input4 = "ncp|56-2629193|1955-11-28|20190213|73700|6404|182232|self|-123|-123|-123|0.0|20.0|325.0|0.0|0.0|269.28|269.28";







    public HashMap<String,String> getHashmap() throws IOException {
        HashMap<String,String> hm = new HashMap<String,String>();
        hm.put(input1,mockendpoint.Payload1());
        hm.put(input2,mockendpoint.Payload2());
        hm.put(input3,mockendpoint.Payload3());
        hm.put(input4,mockendpoint.Payload4());
        return hm;
    }

}

Solution

Please modify a couple of things:

• In case you expect a Map in the request body, you need to have consumes content type something other than text/plain like application/json. The text/plain content won't be converted to Map by any converter. Otherwise, take request body as String and internally convert it to Map in your code.
• In curl request add -X POST. Also, make the payload structure JSON key value pairs.

You are getting 405 error code due to text content in payload and expected request as Map data type. To confirm this, just remove the request body Map and see whether your API is hit. And then follow the steps above.

Comments

[Deadpool]

@RequestBody should be string type right?

[schooner_101]

Would I have to create a hash map separately then from the requestBody?

[Deadpool]

yes, create HashMap separately from that string

[fiveelements]

In curl why don't you put -X POST? And the request payload does nor look like of type Map that you are expecting in controller method. What is the error you are getting after making it texr/ plain?

[fiveelements]

@schooner_101 may I know why you changed the accepted answer? And why my answer does not solve your problem?

[schooner_101]

@fivelements I can't change the payload to JSON due to client standards. and ruhul s answer fixed it by changing it to plain in my code

[fiveelements]

@schooner_101 did not I mention this in my answer: The text/plain content won't be converted to Map by any converter. Otherwise, take request body as String and internally convert it to Map in your code.

[schooner_101]

@fiveelements you have a point. changed answer :)