How to get objects from a Json Array using JsonArray in java?

I'm having a little difficulty getting information from a Json Array, because it's giving the error:

  

Exception in thread "main" json.org.JSONException: JSONArray initial value should be a string or collection or array.

The output of json is:

{"status":"OK","data":[{"worker":"kappauni1","time":1523537400,"lastSeen":1523537364,"reportedHashrate":113223366,"currentHashrate":102500000,"validShares":89,"invalidShares":0,"staleShares":5,"averageHashrate":68804012.34567899},{"worker":"kappauni2","time":1523537400,"lastSeen":1523537351,"reportedHashrate":108686214,"currentHashrate":110277777.77777778,"validShares":96,"invalidShares":0,"staleShares":5,"averageHashrate":62395061.72839507},{"worker":"kappauni3","time":1523537400,"lastSeen":1523537396,"reportedHashrate":211388916,"currentHashrate":175388888.8888889,"validShares":152,"invalidShares":0,"staleShares":9,"averageHashrate":120002314.8148148}]}

Follow the classes, thank you very much if you give a light.

CLASS MAIN

public class Main {

    public static void main(String[]args){

        Conection conection = new Conection();

        Convert convert = new Convert();
        convert.convertJsonForObject(conection.getJson());


    }



}

Class responsible for making connection and generating a return in StringBuilder.

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLConnection;

 class Conection
{

   private StringBuilder resultado = new StringBuilder();

    StringBuilder getJson()
    {

        String address = "https://api.ethermine.org/miner/0x0940f5fAEF2bba7e1e6288E4bc4E9c75ee334b97/workers";

        try {
            URL url = new URL(address);

            try {
                URLConnection connect = url.openConnection();

                connect.setRequestProperty("User-Agent", "Mozilla/4.0");
                InputStream in = connect.getInputStream();
                InputStreamReader inRead = new InputStreamReader(in);

                BufferedReader reader = new BufferedReader(inRead);

                String result;

                while((result = reader.readLine())!=null){

                    this.resultado = resultado.append(result);



                }




            } catch (IOException e) {
                e.printStackTrace();
            }
        } catch (MalformedURLException e) {
            e.printStackTrace();
        }

            return resultado;
    }

}

Class responsible for converting Json to object, here I can not get the Json Array data correctly.

import json.org.JSONArray;
import json.org.JSONObject;

 class Convert {

     void convertJsonForObject(StringBuilder json){

        System.out.println(json);

         JSONObject obj = new JSONObject(json);
         JSONArray jArray = obj.getJSONArray("data");

        for(int i = 0; i < jArray.length(); i++){

            obj = jArray.getJSONObject(i);

            System.out.print(obj.toString());
        }

    }
}

The output of the error is:

{"status":"OK","data":[{"worker":"kappauni1","time":1523548800,"lastSeen":1523548743,"reportedHashrate":113155830,"currentHashrate":95833333.33333333,"validShares":83,"invalidShares":0,"staleShares":5,"averageHashrate":69709876.54320988},{"worker":"kappauni2","time":1523548800,"lastSeen":1523548779,"reportedHashrate":108667905,"currentHashrate":86944444.44444445,"validShares":75,"invalidShares":0,"staleShares":5,"averageHashrate":64443672.83950619},{"worker":"kappauni3","time":1523548800,"lastSeen":1523548783,"reportedHashrate":213519635,"currentHashrate":167611111.1111111,"validShares":145,"invalidShares":0,"staleShares":9,"averageHashrate":123407407.40740736}]}

Exception in thread "main" json.org.JSONException: JSONObject["data"] not found.
    at json.org.JSONObject.get(JSONObject.java:566)
    at json.org.JSONObject.getJSONArray(JSONObject.java:760)
    at Convert.convertJsonForObject(Convert.java:11)
    at Main.main(Main.java:10)

Process finished with exit code 1