Expected BEGIN_ARRAY but was BEGIN_OBJECT

Question

I am a beginner and I am using Retrofit 2 in my app. I have this JSON. (I have tried many solution but nothing worked for me). Thank for your help

Error which I have: Expected BEGIN_ARRAY but was BEGIN_OBJECT at line 1 column 2

JSON

{
   responseCode: 1,
   responseCodeText: "ok",
   response: [
      {
         lat: 67.2422432322,
         lng: 25.1441441441,
         title: "Point na mapě 1",
         desc: "Lorem ipsum dolor sit amet, consectetur adipisicing elit.\nVero praesentium fugiat nobis pariatur cupiditate saepe dolorum, soluta dignissimos.",
         photo: [
            "http://photo3.jpg",
            "http://photo4.jpg",
         ]
      },
      {
         lat: 39.1234787,
         lng: 25.2242445,
         title: "Point na mapě 2",
         desc: "Possimus veritatis, neque a et odit ad itaque iusto asperiores perspiciatis voluptates,\nvero praesentium fugiat nobis pariatur cupiditate saepe dolorum, soluta dignissimos.",
         photo: [
            "http://photo1.jpg",
            "http://photo2.jpg",
         ]
      }, 
      //other

Interface

public interface PointsInterface {

        String BASE_URL = "MY_URL/";

         @POST("getPointsOnMap")
         Call<List<PointsOnMap>> getPointsOnMap();

        class Factory {
            private static PointsInterface service;

            public static PointsInterface getInstance() {
                if (service == null) {
                    Retrofit retrofit = new Retrofit.Builder().addConverterFactory(GsonConverterFactory.create()).baseUrl(BASE_URL).build();
                    service = retrofit.create(PointsInterface.class);
                    return service;
                } else {
                    return service;
                }
            }
        }
    }

API call

//apiService

   public void serviceInit() {
        PointsInterface.Factory.getInstance().getPointsOnMap().enqueue(new Callback<List<PointsOnMap>>() {
            @Override
            public void onResponse(Call<List<PointsOnMap>> call, Response<List<PointsOnMap>> response) {
                List<PointsOnMap> result = response.body();
                Log.d("response", "Number of points received: " + result.size());
            }

            @Override
            public void onFailure(Call<List<PointsOnMap>> call, Throwable t) {
                Log.e("error", "Error");
            }
        });}

Model

public class PointsOnMap {

    @SerializedName("lat") private Double lat;
    @SerializedName("lng") private Double lng;
    @SerializedName("title") private String title;
    @SerializedName("desc") private String desc;

    public PointsOnMap(Double lat, Double lng, String title, String desc) {
        this.lat = lat;
        this.lng = lng;
        this.title = title;
        this.desc = desc;
    }

    public Double getLat() {
        return lat;
    }

    public void setLat(Double lat) {
        this.lat = lat;
    }

    public Double getLng() { return lng; }

    public void setLng(Double lng) {
        this.lng = lng;
    }

    public String getTitle() { return title; }

    public void setTitle(String title) {
        this.title = title;
    }

    public String getDesc() {
        return desc;
    }

    public void setDesc(String desc) {
        this.desc = desc;
    }
}

Answer 1

Your Retrofit interface

     @POST("getPointsOnMap")
     Call<List<PointsOnMap>> getPointsOnMap();

Should be

     @POST("getPointsOnMap")
     Call<PointsOnMapResponse> getPointsOnMap();

where PointsOnMapResponse is

public class PointsOnMapResponse {
    @SerializedName("responseCode")
    long responseCode;

    @SerializedName("responseCodeText")
    String responseCodeText;

    @SerializedName("response")
    List<PointsOnMap> response;

    //getters, setters
}

Answer 2

this is because of

@POST("getPointsOnMap")
Call<List<PointsOnMap>> getPointsOnMap();

Here you remove List your error will be solved.

 @POST("getPointsOnMap")
 Call<PointsOnMap> getPointsOnMap();

Good luck

Answer 3

in PointsInterface replace

@POST("getPointsOnMap")
Call<List<PointsOnMap>> getPointsOnMap(); 

to

@POST("getPointsOnMap")
Call<PointsOnMap> getPointsOnMap(); 

as well as replace

 public void serviceInit() {
    PointsInterface.Factory.getInstance().getPointsOnMap().enqueue(new Callback<List<PointsOnMap>>() {
        @Override
        public void onResponse(Call<List<PointsOnMap>> call, Response<List<PointsOnMap>> response) {
            List<PointsOnMap> result = response.body();
            Log.d("response", "Number of points received: " + result.size());
        }

        @Override
        public void onFailure(Call<List<PointsOnMap>> call, Throwable t) {
            Log.e("error", "Error");
        }
    });}

to

 public void serviceInit() {
    PointsInterface.Factory.getInstance().getPointsOnMap().enqueue(new Callback<PointsOnMap>() {
        @Override
        public void onResponse(Call<PointsOnMap> call, Response<PointsOnMap> response) {
            PointsOnMap result = response.body();
            Log.d("response", "Number of points received: " + result.size());
        }

        @Override
        public void onFailure(Call<PointsOnMap> call, Throwable t) {
            Log.e("error", "Error");
        }
    });}