Retrofit 2: responseBodyConverter converts to null object

Question

I'm using the latest (as of now 2.0.0-beta4) version of Retrofit. When receiving 200 OK code from server, everything is working fine. But I want to deal with not OK responses too, such as code 401. So, I have to get the error response code to figure out exactly what action to do and display appropriate data:

@Override
public void onResponse(Call<LoginResponse> call, Response<LoginResponse> response) {
    if (response != null && !response.isSuccess() && response.errorBody() != null) {
        Converter<ResponseBody, APIError> errorConverter = retrofit.responseBodyConverter(APIError.class, new Annotation[0]);
        try {
            APIError error = errorConverter.convert(response.errorBody());
            Toast.makeText(getContext(), "code = " + error.getCode() + ", status = " + error.getStatus(), Toast.LENGTH_SHORT).show();
        } catch (IOException e) {
            e.printStackTrace();
        }
    } else if (null != response) {
        if (response.isSuccess()) {
            LoginResponse loginResponse = response.body();
            Toast.makeText(getContext(), "Successful login: " + loginResponse.getId(), Toast.LENGTH_SHORT).show();
        }
    }
}

APIError.java

public class APIError {
    String name;
    int status;
    String message;
    int statusCode;
    String code;
    String stack;

    public String getName() {
        return name;
    }

    public int getStatus() {
        return status;
    }

    public String getCode() {
        return code;
    }
}

Server's error response

{
  "error": {
    "name": "Error",
    "status": 401,
    "message": "login failed",
    "statusCode": 401,
    "code": "LOGIN_FAILED",
    "stack": "Error: login failed"
  }
}

But errorConverter.convert() returns an object with null values. I've looked similar posts, but it didn't help.

What is wrong with the code?

score 2 · Accepted Answer · answered Apr 01 '16 at 08:08

Found the answer in futurestud.io blog comments:

Changed the APIError.java to this:

public class APIError {

    Error error;

    public Error getError() {
        return error;
    }

    public static class Error {

        String name;
        int status;
        String message;
        int statusCode;
        String code;
        String stack;

        public String getName() {
            return name;
        }

        public int getStatus() {
            return status;
        }

        public String getCode() {
            return code;
        }

    }
}

Retrofit 2: responseBodyConverter converts to null object

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