Expected BEGIN_OBJECT but was STRING at line 13 column 1 path $

Question

I saw this issue many times, but still can't understand. It looks like I send request on site and it's body isn't correct. But why? May be I don't understand clearly how retrofit works, but do not I just collect a link for the request and wait for the answer from the server? Here is the link: here

An interface with request

public interface NService {
    @GET("/computers?p=2")
    Call<Model> getItems();
}

and class with base URL

public class APIUtils {

    public static final String BASE_URL = "http://testwork.nsd.naumen.ru/rest/";

    public static NService getMService() {
        return RetrofitClient.getClient(BASE_URL).create(NService.class);
    }
}

retrofit build class

public class RetrofitClient {

    private static Retrofit retrofit = null;


    public static Retrofit getClient(String baseURL) {
        if (retrofit==null) {
            Gson gson = new GsonBuilder()
                    .setLenient()
                    .create();
            retrofit = new Retrofit.Builder()
                    .baseUrl(baseURL)
                    .addConverterFactory(GsonConverterFactory.create(gson))
                    .build();
        }
        return retrofit;
    }
}

JSON were parsed though this

and MainActivity is:

public class MainActivity extends AppCompatActivity {
    private List<Item> responseModel;
    private NService mService;
    private TextView textView;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        Log.d("testcrap", "before loading set");
        setContentView(R.layout.activity_main);
        mService = APIUtils.getMService(); // Строим retrofit объект, собираем ссылку
        Log.d("testcrap", "before loading");
        loadSomeCrap();
        Log.d("testcrap", "after loading");
    }

    public void loadSomeCrap() {
        Log.d("testcrap", "started parsing");
        mService.getItems().enqueue(new Callback<Model>() {

            @Override
            public void onResponse(Call<Model> call, Response<Model> response) {
                Log.d("testcrap", "started onResponse");

                if(response.isSuccessful()) {
                    Log.d("testcrap", "posts loaded from API");
                }else {
                    Log.d("testcrap", "posts not loaded from API");
                }
            }

            @Override
            public void onFailure(Call<Model> call, Throwable t) {
                //showErrorMes  sage();
                Log.d("testcrap", t.toString());

            }
        });
    }
}

Log:

before loading set
before loading
started parsing
after loading
com.google.gson.JsonSyntaxException: java.lang.IllegalStateException: Expected BEGIN_OBJECT but was STRING at line 13 column 1 path $

So, if it's wrong request, what should I change for normal work?

Answer 1

Your API or JSON response is returning JSON_OBJECT but you are getting it in String so this JsonSyntaxException is shown you. Try to fetch response in OBJECT.

Answer 2

Make these changes ..

BASE_URL = "http://testwork.nsd.naumen.ru/"

And then on interface ..

@GET("rest/computers?p=2")
.............