Jérôme Boé Jérôme Boé - 19 days ago 7
Android Question

Fatal Exception thrown on Scheduler.Worker thread with Retrofit 2 and Rx

This is the code I use to make Http call.
I can't reproduce the error, but Bugsnag tells me that some users are getting this error :

java.lang.IllegalStateException StrictMode.java


public class ApiManager {
public interface Callback<T> {
void onError(Throwable e);

void onSuccess(T result);
}

private ApiService _apiService;

public ApiManager() {
Retrofit retrofit = new Retrofit.Builder()
.baseUrl(BuildConfig.BASE_URL)
.addCallAdapterFactory(RxJavaCallAdapterFactory.create())
.addConverterFactory(GsonConverterFactory.create())
.client(ew OkHttpClient())
.build();
_apiService = retrofit.create(ApiService.class);
}

private <T> void execute(Observable<T> observable, final Callback<T> callback) {
observable.subscribeOn(Schedulers.computation())
.observeOn(AndroidSchedulers.mainThread())
.subscribe(new Subscriber<T>() {
@Override
public void onCompleted() {
}

@Override
public void onError(Throwable e) {
callback.onError(e);
}

@Override
public void onNext(T result) {
callback.onSuccess(result);
}
});
}

public void createUser(Callback<Void> callback) {
execute(_apiService.createUser(new User()), callback);
}

// Retrofit Service
public interface ApiService {
@POST("users")
Observable<Void> createUser(@Body User user);
}
}


Here is the full trace :

java.lang.IllegalStateException: Fatal Exception thrown on Scheduler.Worker thread.
at rx.internal.schedulers.ScheduledAction.run(ScheduledAction.java:62)
at android.os.Handler.handleCallback(Handler.java:725)
at android.os.Handler.dispatchMessage(Handler.java:92)
at android.os.Looper.loop(Looper.java:153)
at android.app.ActivityThread.main(ActivityThread.java:5340)
at java.lang.reflect.Method.invokeNative(Method.java:-2)
at java.lang.reflect.Method.invoke(Method.java:511)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:842)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:609)
at dalvik.system.NativeStart.main(NativeStart.java:-2)
Caused by: rx.exceptions.UnsubscribeFailedException
at rx.observers.SafeSubscriber.onCompleted(SafeSubscriber.java:98)
at rx.internal.operators.OperatorObserveOn$ObserveOnSubscriber.pollQueue(OperatorObserveOn.java:195)
at rx.internal.operators.OperatorObserveOn$ObserveOnSubscriber$2.call(OperatorObserveOn.java:162)
at rx.internal.schedulers.ScheduledAction.run(ScheduledAction.java:55)
at android.os.Handler.handleCallback(Handler.java:725)
at android.os.Handler.dispatchMessage(Handler.java:92)
at android.os.Looper.loop(Looper.java:153)
at android.app.ActivityThread.main(ActivityThread.java:5340)
at java.lang.reflect.Method.invokeNative(Method.java:-2)
at java.lang.reflect.Method.invoke(Method.java:511)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:842)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:609)
at dalvik.system.NativeStart.main(NativeStart.java:-2)
Caused by: android.os.NetworkOnMainThreadException
at android.os.StrictMode$AndroidBlockGuardPolicy.onNetwork(StrictMode.java:1128)
at org.apache.harmony.xnet.provider.jsse.OpenSSLSocketImpl.close(OpenSSLSocketImpl.java:906)
at com.squareup.okhttp.Connection.closeIfOwnedBy(Connection.java:148)
at com.squareup.okhttp.OkHttpClient$1.closeIfOwnedBy(OkHttpClient.java:75)
at com.squareup.okhttp.internal.http.HttpConnection.closeIfOwnedBy(HttpConnection.java:137)
at com.squareup.okhttp.internal.http.HttpTransport.disconnect(HttpTransport.java:135)
at com.squareup.okhttp.internal.http.HttpEngine.disconnect(HttpEngine.java:573)
at com.squareup.okhttp.Call.cancel(Call.java:122)
at retrofit.OkHttpCall.cancel(OkHttpCall.java:162)
at retrofit.RxJavaCallAdapterFactory$CallOnSubscribe$1.call(RxJavaCallAdapterFactory.java:102)
at rx.subscriptions.BooleanSubscription.unsubscribe(BooleanSubscription.java:71)
at rx.internal.util.SubscriptionList.unsubscribeFromAll(SubscriptionList.java:124)
at rx.internal.util.SubscriptionList.unsubscribe(SubscriptionList.java:113)
at rx.Subscriber.unsubscribe(Subscriber.java:98)
at rx.internal.util.SubscriptionList.unsubscribeFromAll(SubscriptionList.java:124)
at rx.internal.util.SubscriptionList.unsubscribe(SubscriptionList.java:113)
at rx.Subscriber.unsubscribe(Subscriber.java:98)
at rx.internal.util.SubscriptionList.unsubscribeFromAll(SubscriptionList.java:124)
at rx.internal.util.SubscriptionList.unsubscribe(SubscriptionList.java:113)
at rx.Subscriber.unsubscribe(Subscriber.java:98)
at rx.observers.SafeSubscriber.onCompleted(SafeSubscriber.java:95)
at rx.internal.operators.OperatorObserveOn$ObserveOnSubscriber.pollQueue(OperatorObserveOn.java:195)
at rx.internal.operators.OperatorObserveOn$ObserveOnSubscriber$2.call(OperatorObserveOn.java:162)
at rx.internal.schedulers.ScheduledAction.run(ScheduledAction.java:55)
at android.os.Handler.handleCallback(Handler.java:725)
at android.os.Handler.dispatchMessage(Handler.java:92)
at android.os.Looper.loop(Looper.java:153)
at android.app.ActivityThread.main(ActivityThread.java:5340)
at java.lang.reflect.Method.invokeNative(Method.java:-2)
at java.lang.reflect.Method.invoke(Method.java:511)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:842)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:609)
at dalvik.system.NativeStart.main(NativeStart.java:-2)


I also tried to subscribe on
Sheduler.io()
and
Scheduler.newThread()
, but I get the same error.

Answer

It looks like upgrading to com.squareup.retrofit2:retrofit:2.0.2 using okhttp3solved the problem.

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