Fatal - Interface not implemented - OkHttp3 - Android

Question

I am requesting a JSON file with OkHttp3, RetroFit 2.0 + RxObservable and it throws Interface not implemented. This appears to only happen on Android 4.3 users who are running an older version of our app and upgrade to the latest app version.

01-19 16:43:31.089 1611-1692/? E/AndroidRuntime: FATAL EXCEPTION: IntentService[MyDataIntentService]
                                     java.lang.IncompatibleClassChangeError: interface not implemented
                                         at okhttp3.internal.Util.closeQuietly(Util.java:100)
                                         at okhttp3.internal.connection.StreamAllocation.streamFailed(StreamAllocation.java:332)
                                         at okhttp3.internal.http.RetryAndFollowUpInterceptor.recover(RetryAndFollowUpInterceptor.java:209)
                                         at okhttp3.internal.http.RetryAndFollowUpInterceptor.intercept(RetryAndFollowUpInterceptor.java:132)
                                         at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:92)
                                         at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:67)
                                         at okhttp3.logging.HttpLoggingInterceptor.intercept(HttpLoggingInterceptor.java:212)
                                         at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:92)
                                         at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:67)
                                         at okhttp3.RealCall.getResponseWithInterceptorChain(RealCall.java:179)
                                         at okhttp3.RealCall.execute(RealCall.java:63)
                                         at retrofit2.OkHttpCall.execute(OkHttpCall.java:174)
                                         at retrofit2.adapter.rxjava.RxJavaCallAdapterFactory$CallOnSubscribe.call(RxJavaCallAdapterFactory.java:144)
                                         at retrofit2.adapter.rxjava.RxJavaCallAdapterFactory$CallOnSubscribe.call(RxJavaCallAdapterFactory.java:125)
                                         at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:50)
                                         at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:30)
                                         at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:50)
                                         at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:30)
                                         at rx.Observable.subscribe(Observable.java:8759)
                                         at rx.Observable.subscribe(Observable.java:8726)
                                         at rx.Observable.subscribe(Observable.java:8581)
                                         at com.somepackage.someclass.loadSomeJSONThing(MyFile.kt:61)

---

Here's the call:

//get returns Observable<Any>
myApi.getSomeObj("some_id")
     .subscribe({ responseHandler(it) },
                { Crashlytics.logException(it) })

Answer 1

I think this is an OkHttp regression. We’re incorrectly assuming Socket implements Closeable, which isn't the case for older devices. Will fix very soon.

Fixed here: https://github.com/square/okhttp/pull/3125