Spring boot RestAPI nested JSONObject is empty

Question

I have a problem with a JSON request to my REST Api.

My request is something like:

{"task":"get_objects","data":{"guid":"1234"}}

But when I want to read the "data" object in my controller it's empty. I get an error: org.json.JSONException: JSONObject["guid"] not found.

ApiController.java:

import java.util.List;

import org.json.JSONArray;
import org.json.JSONObject;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.http.HttpStatus;
import org.springframework.http.ResponseEntity;
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;

@RestController
@RequestMapping("/api")
public class ApiController {
    @Autowired
    private AssemblyRepository assemblyRepo;

    @RequestMapping(method=RequestMethod.POST)
    public ResponseEntity<JSONObject> sendResponse(@RequestBody AppRequest request) {
        String task = request.getTask();
        JSONObject data = request.getData();
        String guid = data.getString("guid");
        String password = data.getString("pwd");

        //Do some stuff with the data
    }
}

AppRequest.java:

import org.json.JSONObject;

public class AppRequest {

    private String task;
    private JSONObject data;

    public String getTask() {
        return task;
    }

    public void setTask(String task) {
        this.task = task;
    }

    public JSONObject getData() {
        System.out.println("AppRequest getData: " + data);
        return data;
    }

    public void setData(JSONObject data) {
        System.out.println("AppRequest getData: " + data);
        this.data = data;
    }
}

I also tried to change the "data" from JSONObject to String but then I get the message Could not read JSON: Can not deserialize instance of java.lang.String out of START_OBJECT token I really don't see what I'm doing wrong here ^^

royB · Accepted Answer · 2015-03-27 10:43:50Z

1

Is there a reason why you are trying to work with JSONObject and not a POJO class? if not try something like:

class Data {
  String guid;

}

public class AppRequest {
   Data data;
}

and then

request.getData().getGuid();

then you don't have to work with Serializers

answered Mar 27, 2015 at 10:43

royB

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9 Comments

mommcilo Over a year ago

I think as well, that this is a fix.

Daniel Pinkpank Over a year ago

Thanks. That helped. But now I'm struggeling with a JSONArray within a JSONObject. Something like {"task":"get_objects","data":{"guid":"1234","sup_objects":[{"obj_type":"NT","obj_key":"MS"}]}} How would I solve this?

royB Over a year ago

Add an arraylist of the type you want

royB Over a year ago

Arraylist of the pojo type

Daniel Pinkpank Over a year ago

That's what I've tried. I added ArrayList<SupObject> supObjects; to the Data class. And the SupObject class contains private String obj_type; and private String obj_key; with getters and setters. But it's not working

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