Fatal Exception: java.lang.RuntimeException java.lang.RuntimeException in SafeObserver

[lexer]

I get Fatal Exception: java.lang.RuntimeException java.lang.RuntimeException in SafeObserver in cases when both onError and onNext will through exception inside.

observable1
  .subscribe(new Observer<Configs>() {
                    @Override
                    public void onCompleted() {

                    }

                    @Override
                    public void onError(Throwable e) {
                        throw new UnknownError("Ooooppsss");
                    }

                    @Override
                    public void onNext(Configs args) {
                        throw new UnknownError("Ooooppsss");
                    }
                }); 

Stack trace:

    java.lang.RuntimeException: Error occurred when trying to propagate error to Observer.onError
            at rx.operators.SafeObserver.onError(SafeObserver.java:109)
            at rx.operators.SafeObserver.onNext(SafeObserver.java:125)
            at rx.Notification.accept(Notification.java:121)
            at rx.operators.OperationObserveOn$ObserveOn$2.call(OperationObserveOn.java:121)
            at rx.operators.OperationObserveOn$ObserveOn$2.call(OperationObserveOn.java:116)
            at rx.Scheduler$3.call(Scheduler.java:163)
            at rx.Scheduler$3.call(Scheduler.java:159)
            at rx.android.concurrency.HandlerThreadScheduler$1.run(HandlerThreadScheduler.java:82)
            at android.os.Handler.handleCallback(Handler.java:733)
            at android.os.Handler.dispatchMessage(Handler.java:95)
            at android.os.Looper.loop(Looper.java:136)
            at android.app.ActivityThread.main(ActivityThread.java:5017)
            at java.lang.reflect.Method.invokeNative(Native Method)
            at java.lang.reflect.Method.invoke(Method.java:515)
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)
            at dalvik.system.NativeStart.main(Native Method)
     Caused by: rx.util.CompositeException: UnknownError:Ooooppsss, UnknownError:Ooooppsss
            at rx.operators.SafeObserver.onError(SafeObserver.java:109)
            at rx.operators.SafeObserver.onNext(SafeObserver.java:125)
            at rx.Notification.accept(Notification.java:121)
            at rx.operators.OperationObserveOn$ObserveOn$2.call(OperationObserveOn.java:121)
            at rx.operators.OperationObserveOn$ObserveOn$2.call(OperationObserveOn.java:116)
            at rx.Scheduler$3.call(Scheduler.java:163)
            at rx.Scheduler$3.call(Scheduler.java:159)
            at rx.android.concurrency.HandlerThreadScheduler$1.run(HandlerThreadScheduler.java:82)
            at android.os.Handler.handleCallback(Handler.java:733)
            at android.os.Handler.dispatchMessage(Handler.java:95)
            at android.os.Looper.loop(Looper.java:136)
            at android.app.ActivityThread.main(ActivityThread.java:5017)
            at java.lang.reflect.Method.invokeNative(Native Method)
            at java.lang.reflect.Method.invoke(Method.java:515)
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)
            at dalvik.system.NativeStart.main(Native Method)

[lexer]

Issue is very typical for Android. Assume that we do some work with UI in onNext and onError. This work will fail with exception if activity was closed by the time async operation is completed. So we need to ensure that all exceptions in onError and onNext will be suppressed.

[benjchristensen]

If you want to suppress everything then you need to make sure you don't throw from within onError or an onErrorResumeNext operator. You can swallow the errors if you want, but RxJava won't swallow them automatically.

[lexer]

@benjchristensen got it! thanks.

[dhavaljivani]

cant get it how to resolve it??