springboot return responseentity return JSON

Question

I want to return JSON below.

{ "name": "jackie" }

Postman is giving me error. Stating

Unexpected 'n'

New to Spring Boot here. 1 day old. Is there a proper way to do this?

   // POST method here
    @RequestMapping(method = RequestMethod.POST , produces = "application/json")
    ResponseEntity<?> addTopic(@RequestBody Topic topic) {

        if (Util.save(topicRepository, new Topic(topic.getTopicName(), topic.getQuestionCount())) != null) {
            return Util.createResponseEntity("Name : jackie", HttpStatus.CREATED);
        }
        return Util.createResponseEntity("Error creating resource", HttpStatus.BAD_REQUEST);
    }

Possible duplicate of Spring MVC - How to return simple String as JSON in Rest Controller — luk2302
– luk2302, Commented Jun 2, 2018 at 6:51
What on earth is Util? It scares me... Why would a class save things to repos and create response entities; in what version of the world are they within the same responsibility set? — Boris the Spider
– Boris the Spider, Commented Jun 2, 2018 at 7:38
The only sane way that this happens is if Util was an inner class of the controller taking care of calling services so the controller can focus on messing with input/output — T Tse
– T Tse, Commented Jan 4, 2021 at 7:50

Ashwin · Accepted Answer · 2020-09-07 01:41:37Z

7

This is what I use:

@GetMapping(produces = MediaType.APPLICATION_JSON_VALUE)
public ResponseEntity<Map<String, String>> hello() {
    try {
        Map<String, String> body = new HashMap<>();
        body.put("message", "Hello world");
        return new ResponseEntity<>(body, HttpStatus.OK);
    } catch (Exception e) {
        return new ResponseEntity<>(HttpStatus.INTERNAL_SERVER_ERROR);
    }
}

answered Sep 7, 2020 at 1:41

Ashwin

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Comments

Sanjay · Accepted Answer · 2018-06-08 07:03:34Z

4

Create model and store value in that model and return model from controller. Check Below code.

class User{
     private String name;
     //getter and setter
}


 @RequestMapping(method = RequestMethod.POST , produces = "application/json")
    ResponseEntity<User> addTopic(@RequestBody Topic topic) {
          User user=new User();
          user.setName("myname");
           HttpHeaders httpHeaders = new HttpHeaders();
          return new ResponseEntity<User>(user, httpHeaders, HttpStatus.CREATED);   
    }

edited Jun 8, 2018 at 7:03

answered Jun 2, 2018 at 7:01

Sanjay

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1 Comment

Boris the Spider Over a year ago

ResponseEntity<User> addTopic and return user - won't compile.

abstractKarshit · Accepted Answer · 2018-06-02 07:02:02Z

Try wrapping your response in object.

class Response implements Serializable {
    private String name;

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }
}

And Controller can be like this:

@RequestMapping(method = RequestMethod.POST , produces = "application/json")
ResponseEntity<?> addTopic(@RequestBody Topic topic) {

    if (Util.save(topicRepository, new Topic(topic.getTopicName(), topic.getQuestionCount())) != null) {
        Response response = new Response();
        response.setName("jackie");
        return new ResponseEntity<>(response, HttpStatus.CREATED);
    }
    return Util.createResponseEntity("Error creating resource", HttpStatus.BAD_REQUEST);
}

GuniorG · Accepted Answer · 2023-01-04 21:16:13Z

0

@PostMapping("/register/service/provider")
public ResponseEntity<?> registerServiceProvider(@RequestBody ServiceProviderRequestPayload providerContext) {

    try {
        if (providerContext == null)
            throw new BadRequestException("the request body can not be null or empty.");

        if (!providerContext.isValid())
            throw new BadRequestException("The request body doesn't seems to be valid");


        return ResponseEntity.ok().contentType(MediaType.APPLICATION_JSON).body(new ObjectMapper().writeValueAsString(providerContext));
    } catch (BadRequestException | IllegalArgumentException e) {
        return ResponseEntity.badRequest().header("message", e.getMessage())
                .contentType(MediaType.APPLICATION_JSON).build();
    } catch (DuplicateKeyException keyException) {
        return ResponseEntity.badRequest().header("message", "There seems to be farmer config" + keyException.getCause())
                .contentType(MediaType.APPLICATION_JSON).build();
    } catch (JsonProcessingException e) {
        throw new RuntimeException(e);
    }
}

answered Jan 4, 2023 at 21:16

GuniorG

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1 Comment

GuniorG Over a year ago

in the above solution the providerContext is the object reference of the POJO class that we have to write as JSON response to ResponseEntity

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