Retrofit 2: No virtual method newJsonReader(Ljava/io/Reader;) NoSuchMethodException

问题

I am searching for this error whole internet, but yet, only one stackoverflow entry with no answer or comment. I am trying to use Retrofit 2. It is my first time using it. Here are my dependencies:

compile 'com.squareup.retrofit2:retrofit:2.1.0'
compile 'com.squareup.retrofit2:converter-gson:2.1.0'
compile 'com.google.code.gson:gson:2.6.2'

I exclued any OkHttp libraries as Retrofit already uses it.

This is my request interface:

public interface LoginService {
    @POST(HTTPService.AUTHENTICATIO_URL)
    Call<User> login();
}

Next: my Service generator:

public class ServiceGenerator {

public static final String API_BASE_URL = HTTPService.BASE_URL;

private static OkHttpClient.Builder httpClient = new OkHttpClient.Builder();

private static Retrofit.Builder builder =
        new Retrofit.Builder()
                .baseUrl(API_BASE_URL)
                .addConverterFactory(GsonConverterFactory.create());

public static <S> S createService(Class<S> serviceClass, String username, String password, String roleId) {
    if (username != null && password != null) {
        String credentials = username+":"+password+":"+roleId;
        final String basic =
                "Basic " + Base64.encodeToString(credentials.getBytes(), Base64.NO_WRAP);
        httpClient.addInterceptor(chain -> {
            Request original = chain.request();

            Request.Builder requestBuilder = original.newBuilder()
                    .header("Authorization", basic)
                    .header("Accept", "application/json")
                    .method(original.method(), original.body());

            Request request = requestBuilder.build();
            return chain.proceed(request);
        });
    }

    OkHttpClient client = httpClient.build();
    Retrofit retrofit = builder.client(client).build();
    return retrofit.create(serviceClass);
    }
}

And next: where I make the request:

 @Override
public void loadData(DataSource.LoadJsonCallback loadJsonCallback) {
    String login = mUser.getLogin();
    String password = mUser.getPassword();
    LoginService loginService =
            ServiceGenerator.createService(LoginService.class, login, password, "");
    Call<User> call = loginService.login();
    String a = call.request().url().toString();
    call.enqueue(new Callback<User>() {
        @Override
        public void onResponse(Call<User> call, Response<User> response) {
            try {
                loadJsonCallback.onTasksLoaded(response.body());
                User a = response.body();
                mUser = getDataFromJson("");
                if (mUser != null) {
                    mUser.setPassword(password);
                }
            } catch (JSONException e) {
                e.printStackTrace();
            }
        }
        @Override
        public void onFailure(Call<User> call, Throwable t) {
            loadJsonCallback.onDataNotAvailable(t.getMessage());
        }
    });

}

So, I get this exception, that I cannot find anywhere:

java.lang.NoSuchMethodError: No virtual method newJsonReader(Ljava/io/Reader;)Lcom/google/gson/stream/JsonReader; in class Lcom/google/gson/Gson; or its super classes (declaration of 'com.google.gson.Gson' appears in /data/app/org.ucomplex.ucomplex-2/base.apk)

Thank you for any help.

回答1:

I started using the newer versions:

compile 'com.google.code.gson:gson:2.7'
compile 'com.squareup.retrofit2:retrofit:2.2.0'
compile 'com.squareup.retrofit2:converter-gson:2.2.0'

And the error disappeared.

来源：https://stackoverflow.com/questions/41258878/retrofit-2-no-virtual-method-newjsonreaderljava-io-reader-nosuchmethodexcept

标签

android

gson

retrofit

retrofit2