Observable.empty(), java.util.NoSuchElementException neden olur: Sıra hiçbir eleman içermez

Question

RxJava 1.0.14 ile Retrofit 2.0.0-beta2 kullanıyorum. Ben doFinally bazı kod yürütmesine gerek çünkü hataları bu şekilde işlemek:

.onErrorResumeNext(Observable.empty());

Ama yığın izlemesinde hiçbir Derslerimi ile benim app çöker bir hata (örneğin 401) ile bir http yanıtı alınca . Observable.never kullanılırsa kötü bir şey olmaz. İşte tam yığın izleme: Ayrıca first() kolaylık operatörüdür Bu take(1).single() eşittir

java.lang.IllegalStateException: Exception thrown on Scheduler.Worker thread. Add `onError` handling. 
at rx.internal.schedulers.ScheduledAction.run (ScheduledAction.java:60) 
at android.os.Handler.handleCallback (Handler.java:739) 
at android.os.Handler.dispatchMessage (Handler.java:95) 
at android.os.Looper.loop (Looper.java:135) 
at android.app.ActivityThread.main (ActivityThread.java:5221) 
at java.lang.reflect.Method.invoke (Unknown source) 
at java.lang.reflect.Method.invoke (Method.java:372) 
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run (ZygoteInit.java:899) 
at com.android.internal.os.ZygoteInit.main (ZygoteInit.java:694) 

rx.exceptions.OnErrorNotImplementedException: Sequence contains no elements 
at rx.Observable$27.onError (Observable.java:7535) 
at rx.observers.SafeSubscriber._onError (SafeSubscriber.java:154) 
at rx.observers.SafeSubscriber.onError (SafeSubscriber.java:111) 
at rx.internal.operators.OperatorDoOnEach$1.onError (OperatorDoOnEach.java:70) 
at rx.internal.operators.OperatorDoOnEach$1.onError (OperatorDoOnEach.java:70) 
at rx.internal.operators.OperatorDoOnEach$1.onError (OperatorDoOnEach.java:70) 
at rx.internal.operators.OperatorObserveOn$ObserveOnSubscriber.pollQueue (OperatorObserveOn.java:197) 
at rx.internal.operators.OperatorObserveOn$ObserveOnSubscriber$2.call (OperatorObserveOn.java:170) 
at rx.internal.schedulers.ScheduledAction.run (ScheduledAction.java:55) 
at android.os.Handler.handleCallback (Handler.java:739) 
at android.os.Handler.dispatchMessage (Handler.java:95) 
at android.os.Looper.loop (Looper.java:135) 
at android.app.ActivityThread.main (ActivityThread.java:5221) 
at java.lang.reflect.Method.invoke (Unknown source) 
at java.lang.reflect.Method.invoke (Method.java:372) 
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run (ZygoteInit.java:899) 
at com.android.internal.os.ZygoteInit.main (ZygoteInit.java:694) 

java.util.NoSuchElementException: Sequence contains no elements 
at rx.internal.operators.OperatorSingle$ParentSubscriber.onCompleted (OperatorSingle.java:131) 
at rx.internal.operators.OperatorTake$1.onCompleted (OperatorTake.java:53) 
at rx.Observable$EmptyHolder$1.call (Observable.java:1077) 
at rx.Observable$EmptyHolder$1.call (Observable.java:1074) 
at rx.Observable.unsafeSubscribe (Observable.java:7710) 
at rx.internal.operators.OperatorOnErrorResumeNextViaObservable$1.onError (OperatorOnErrorResumeNextViaObservable.java:76) 
at rx.internal.operators.OperatorDoOnEach$1.onError (OperatorDoOnEach.java:70) 
at rx.internal.operators.OperatorSubscribeOn$1$1$1.onError (OperatorSubscribeOn.java:71) 
at rx.observers.SerializedObserver.onError (SerializedObserver.java:159) 
at rx.observers.SerializedSubscriber.onError (SerializedSubscriber.java:79) 
at rx.internal.operators.OperatorTakeUntil$1.onError (OperatorTakeUntil.java:49) 
at rx.internal.operators.OperatorMerge$MergeSubscriber.reportError (OperatorMerge.java:239) 
at rx.internal.operators.OperatorMerge$MergeSubscriber.checkTerminate (OperatorMerge.java:774) 
at rx.internal.operators.OperatorMerge$MergeSubscriber.emitLoop (OperatorMerge.java:532) 
at rx.internal.operators.OperatorMerge$MergeSubscriber.emit (OperatorMerge.java:521) 
at rx.internal.operators.OperatorMerge$InnerSubscriber.onError (OperatorMerge.java:808) 
at rx.Observable$ThrowObservable$1.call (Observable.java:9600) 
at rx.Observable$ThrowObservable$1.call (Observable.java:9590) 
at rx.Observable.unsafeSubscribe (Observable.java:7710) 
at rx.internal.operators.OperatorMerge$MergeSubscriber.onNext (OperatorMerge.java:231) 
at rx.internal.operators.OperatorMerge$MergeSubscriber.onNext (OperatorMerge.java:140) 
at rx.internal.operators.OperatorMap$1.onNext (OperatorMap.java:55) 
at retrofit.RxJavaCallAdapterFactory$CallOnSubscribe.call (RxJavaCallAdapterFactory.java:113) 
at retrofit.RxJavaCallAdapterFactory$CallOnSubscribe.call (RxJavaCallAdapterFactory.java:88) 
at rx.Observable$2.call (Observable.java:162) 
at rx.Observable$2.call (Observable.java:154) 
at rx.Observable$2.call (Observable.java:162) 
at rx.Observable$2.call (Observable.java:154) 
at rx.Observable$2.call (Observable.java:162) 
at rx.Observable$2.call (Observable.java:154) 
at rx.Observable.unsafeSubscribe (Observable.java:7710) 
at rx.internal.operators.OperatorSubscribeOn$1$1.call (OperatorSubscribeOn.java:62) 
at rx.internal.schedulers.ScheduledAction.run (ScheduledAction.java:55) 
at java.util.concurrent.Executors$RunnableAdapter.call (Executors.java:422) 
at java.util.concurrent.FutureTask.run (FutureTask.java:237) 
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201 (ScheduledThreadPoolExecutor.java:152) 
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run (ScheduledThreadPoolExecutor.java:265) 
at java.util.concurrent.ThreadPoolExecutor.runWorker (ThreadPoolExecutor.java:1112) 
at java.util.concurrent.ThreadPoolExecutor$Worker.run (ThreadPoolExecutor.java:587) 
at java.lang.Thread.run (Thread.java:818) 

sayesinde
Anton yığın izleme itibaren

Answer 1

,

at rx.internal.operators.OperatorSingle$ParentSubscriber.onCompleted (OperatorSingle.java:131) 
at rx.internal.operators.OperatorTake$1.onCompleted (OperatorTake.java:53) 

. Sonunu kullandığınızdan şüpheliyim, ama her ikisi de en az bir eleman gerektirir.

empty() kullanarak, aşağı akışlı işleçlerin sözleşmesini ihlal eden hiçbir öğeye sahip olmayan bir gözlem oluşturuyorsunuz. onErrorResumeNext'da varsayılan bir öğeyi görüntülenebilir ya da herhangi bir öğe içermeyen akışları desteklemek için aşağı akış kodunuzu değiştirin.