Issue when mapping GET request parameters with DTO object in Spring Boot Rest

Question

I have created a Spring Boot with Spring REST application.

This is my controller code.

@RestController
public class SampleController {

  @RequestMapping(value = "/sample/get", method = RequestMethod.GET, produces = "application/json")
  @ResponseBody
  public Response getResponse(SampleDTO dto) {
    Response response = new Response();

    response.setResponseMsg("Hello "+dto.getFirstName());

    return response;
  }
}

This is my SampleDTO

public class SampleDTO {

  @JsonProperty("firstname")
  private String firstName;

  public String getFirstName() {
    return firstName;
  }

  public void setFirstName(String firstName) {
    this.firstName = firstName;
  }
}

and this is my Response object

public class Response {

  private String responseMsg;

  public String getResponseMsg() {
    return responseMsg;
  }

  public void setResponseMsg(String responseMsg) {
    this.responseMsg = responseMsg;
  }
}

When I try to access service this way

http://localhost:8080/sample/get?firstName=mvg

I am getting this expected output

{"responseMsg":"Hello mvg"}

When I try to access service this way

http://localhost:8080/sample/get?firstname=mvg

I am getting this output

{"responseMsg":"Hello null"}

My question is how do I map 'firstname' in request parameter with 'firstName' of DTO?

Thanks in advance

in your SampleController in your method add this annotation @RequestBody on the SampleDTO param — AntJavaDev
– AntJavaDev, Commented Jun 7, 2016 at 10:28
I am getting this error Failed to read HTTP message: org.springframework.http.converter.HttpMessageNotReadableException: Required request body is missing: public com.sample.dto.Response com.sample.controller.SampleController.getResponse(com.sample.dto.SampleDTO) When I am adding this @RequestBody — mvg
– mvg, Commented Jun 7, 2016 at 10:32
then you are not fixing the json properly from your client / jsp — AntJavaDev
– AntJavaDev, Commented Jun 7, 2016 at 12:40

kiran · Accepted Answer · 2016-06-07 10:04:57Z

0

When you are setting @JsonProperty("firstname") make sure you are imported the this statement "import com.fasterxml.jackson.annotation.JsonProperty ;". One thing more if you are sending more properties and your bean class does not have that you can set the @JsonIgnoreProperties(ignoreUnknown=true) on the top of the bean name.

You are also missing the @RequestBody annotation. You should take this as (@RequestBody SampleDTO dto)in getResponse method.

answered Jun 7, 2016 at 10:04

kiran

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1 Comment

mvg Over a year ago

I am getting this error Failed to read HTTP message: org.springframework.http.converter.HttpMessageNotReadableException: Required request body is missing: public com.sample.dto.Response com.sample.controller.SampleController.getResponse(com.sample.dto.SampleDTO) When I am adding this @RequestBody

Community · Accepted Answer · 2017-05-23 12:32:26Z

0

Simply create a Pojo Java Bean with fields with names that match your request parameters.

Then use this class as an argument for your request handler method (without any additional annotations)

see this

edited May 23, 2017 at 12:32

CommunityBot

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answered Mar 27, 2017 at 14:56

Amin Arab

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Comments

José Ricardo Pla · Accepted Answer · 2016-06-07 10:48:26Z

-1

First you need to choose which approach do you need (or want to use) param or model. When you use something like this http://localhost:8080/sample/get?firstName=mvg , you are passing data as request parameters. So you need to use the @RequestParam annotation.

Sample using @RequestParam annotation (use is explained in the docs)

    @RequestMapping(method = RequestMethod.GET)
public Response foo(@RequestParam("firstName") String firstName) {
    Response response = new Response();
    response.setResponseMsg("Hello "+ firstName );
    return response;
}

edited Jun 7, 2016 at 10:48

answered Jun 7, 2016 at 9:44

José Ricardo Pla

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6 Comments

mvg Over a year ago

I need to know how do I do this with DTO object?

José Ricardo Pla Over a year ago

Map it with @Modelattribute - docs.spring.io/spring/docs/current/spring-framework-reference/…

José Ricardo Pla Over a year ago

The url is working for me. :(. Try it again, please.

mvg Over a year ago

How this part "@ModelAttribute("pet") Pet pet" solves my problem?? Can you please elaborate?

José Ricardo Pla Over a year ago

First you need to choose which approach do you need (or want to use) param or model. When you use something like this localhost:8080/sample/get?firstName=mvg , you are passing data as parameters. So you need to use the @RequestParam annotation.

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