Retrofit 2.0 Convertor returns NULL

Question

I am using Retrofit 2.0.0-beta2 .

I found an example of converting a synchronous .errorBody to an object.

I need to execute it asynchronously.

This is my json:

{
  "error_msg": "This user name is already registered."
}

When I run the asynchronous example, I get null .

package com.test.client;

import com.squareup.okhttp.ResponseBody;

import java.io.IOException;
import java.lang.annotation.Annotation;

import retrofit.Call;
import retrofit.Callback;
import retrofit.Converter;
import retrofit.GsonConverterFactory;
import retrofit.Response;
import retrofit.Retrofit;
import retrofit.http.GET;

public final class DeserializeErrorBody {

interface Service {
    @GET("account.signup")
    Call<User> getUser();
}

static class User {
    // normal fields...
}

static class Error {
    String error_msg;
}

public static void main(String... args) throws IOException {
    Retrofit retrofit = new Retrofit.Builder()
            .baseUrl("https://api.site.com/method/")
            .addConverterFactory(GsonConverterFactory.create())
            .build();

    Service service = retrofit.create(Service.class);


    // ASYNCHRONOUS

    Call<User> response = service.getUser();
    response.enqueue(new Callback<User>() {

        @Override
        public void onResponse(Response<User> response, Retrofit retrofit) {
            if(!responce.isSuccess()) {

                System.out.println(response.errorBody().string()); // returns { "error_msg": "This user name is already registered."}    :)))))

                Converter<ResponseBody, Error> errorConverter = retrofit.responseConverter(Error.class, new Annotation[0]);

                try {
                    Error error = errorConverter.convert(response.errorBody());

                    System.out.println(error); // returns null   :((((((

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

        @Override
        public void onFailure(Throwable t) {
            // ...
        }
    });


    // SYNCHRONOUS

    /*
    Response<User> call = service.getUser().execute();
    Converter<ResponseBody, Error> errorConverter = retrofit.responseConverter(Error.class, new Annotation[0]);

    Error error = errorConverter.convert(call.errorBody());
    System.out.println(error); // returns Object     :))))))
    System.out.println(error.error_msg); // returns "This user name is already registered."    :))))))
    */

}
}

Sorry for my bad english :)

In an asynchronous request, it successfully returns a string . However, conversion to an object is not performed .

How to get an object instead of null ?

Answer 1

, :

System.out.println(response.errorBody().string());

com.squareapp.okhttp.ResponseBody, , string() . , ,

Error error = errorConverter.convert(response.errorBody());

errorBody() , Gson .

, ? errorBody() , . :

System.out.println(response.errorBody().string());

. :

OkHttpClient client = new OkHttpClient();
HttpLoggingInterceptor logging = new HttpLoggingInterceptor();
logging.setLevel(Level.BASIC);
client.interceptors().add(logging);

Retrofit retrofit = new Retrofit.Builder()
       .baseUrl("https://api.site.com/method/")
       .addConverterFactory(GsonConverterFactory.create())
       .client(client)
       .build();