java.lang.NoClassDefFoundError retrofit2.Utils

Question

I\'m using Retrofit to handle the Serverside Data from Mobile. After Implementing retrofit, I am Getting the below Exception.

What am I doing wrong?

Answer 1

With these many library saddles up, it must have exceded the infamous 64k method limit, you need to enable your app for multidex. Here is how you do it. https://developer.android.com/tools/building/multidex.html

Answer 2

It's Gradle bulid configure issue i also got same issue Some times

In Gradle your using

compile 'com.google.android.gms:play-services:8.4.0'

Enire Google Playservice Lib can you change into which are the lib's using in your project

Example

com.google.android.gms:play-services-gcm:8.4.0 
com.google.android.gms:play-services-maps:8.4.0
com.google.android.gms:play-services-auth:8.4.0

Refer This URl https://developers.google.com/android/guides/setup#add_google_play_services_to_your_project

Answer 3

Did you add the following proguard rules?

-dontwarn retrofit2.**
-keep class retrofit2.** { *; }
-keepattributes Signature
-keepattributes Exceptions

Documentation: http://square.github.io/retrofit/

Answer 4

mRetrofit = new Retrofit.Builder()
                    .baseUrl(AppConstance.APP_URL)
                    .addConverterFactory(ScalarsConverterFactory.create())
                    .addConverterFactory(GsonConverterFactory.create())
                    .client(getOkHttpClient())
                    .build();

REWRITE TO

OkHttpClient.Builder httpClient = new OkHttpClient.Builder();
mRetrofit = new Retrofit.Builder()
                        .baseUrl(AppConstance.APP_URL)
                        .addConverterFactory(GsonConverterFactory.create())
                        .client(httpClient)
                        .build();

Answer 5

Try using the same lib version for base retrofit lib and the converters.

compile 'com.squareup.retrofit2:retrofit:2.0.2'
compile 'com.squareup.retrofit2:converter-scalars:2.0.2'
compile 'com.squareup.retrofit2:converter-gson:2.0.2'