RxJava2 Single已處置后，拋出RuntimeException且未將其捕獲

Question

如果已丟棄觀察者，則不會捕獲RxJava2 Single中拋出的RuntimeException，也不會將其發送到Observer的onError（）方法。
我知道調用CompositeDisposable.dispose（）意味着不會調用我的訂閱服務器的onSuccess或onError方法，但是也不應忽略該異常嗎？ 相反，由於未捕獲RuntimeException，應用程序崩潰了。

這是Single，帶有注釋的行會引發RuntimeException，如果在調用.dispose（）方法之前引發了異常，則會捕獲該異常並將錯誤發送給訂閱者，但如果在AFTER之后引發異常對.dispose（）的調用導致應用崩潰。

public Single<Submission> getSubmission(final String threadId, final CommentSort sort) {
        return Single.create(new SingleOnSubscribe<Submission>() {
            @Override
            public void subscribe(SingleEmitter<Submission> e) throws Exception {
                // some irrelevant code

                try {
                    submission = reddit.getSubmission(sr); // Can throw RuntimeException
                    e.onSuccess(submission);
                } catch (Exception ex) {
                    e.onError(ex);
                }
            }
        });
    }  

我訂閱的代碼：

disposables.add(someCompletable
                .andThen(service.getSubmission(threadId, CommentSort.HOT))
                .subscribeOn(schedulerProvider.io())
                .observeOn(schedulerProvider.ui())
                .subscribeWith(new DisposableSingleObserver<Submission>() {
                    @Override
                    public void onSuccess(Submission submission) {
                        // Handle result
                    }

                    @Override
                    public void onError(Throwable e) {
                        // Handle error
                    }
                })
        );

堆棧跟蹤：

E/AndroidRuntime: FATAL EXCEPTION: RxCachedThreadScheduler-2
Process: com.gmail.jorgegilcavazos.ballislife.debug, PID: 15242
java.lang.RuntimeException: Unable to parse JSON: [{"kind": "Listing", "data": {"modhash": null, "children": [{"kind": "t3", "data
at net.dean.jraw.util.JrawUtils.fromString(JrawUtils.java:182)
at net.dean.jraw.http.RestResponse.<init>(RestResponse.java:64) 
at net.dean.jraw.http.OkHttpAdapter.execute(OkHttpAdapter.java:81)
at net.dean.jraw.http.RestClient.execute(RestClient.java:120)
at net.dean.jraw.RedditClient.execute(RedditClient.java:143)
at net.dean.jraw.RedditClient.execute(RedditClient.java:137)
at net.dean.jraw.RedditClient.getSubmission(RedditClient.java:287)
at com.gmail.jorgegilcavazos.ballislife.network.API.RedditService$10.subscribe(RedditService.java:311)
at io.reactivex.internal.operators.single.SingleCreate.subscribeActual(SingleCreate.java:39)
at io.reactivex.Single.subscribe(Single.java:2656)
at io.reactivex.internal.operators.single.SingleDelayWithCompletable$OtherObserver.onComplete(SingleDelayWithCompletable.java:70)
at io.reactivex.internal.disposables.EmptyDisposable.complete(EmptyDisposable.java:67)
at io.reactivex.internal.operators.completable.CompletableEmpty.subscribeActual(CompletableEmpty.java:27)
at io.reactivex.Completable.subscribe(Completable.java:1592)
at io.reactivex.internal.operators.single.SingleDelayWithCompletable.subscribeActual(SingleDelayWithCompletable.java:36)
at io.reactivex.Single.subscribe(Single.java:2656)

Answer 1

找到了答案：

RxJava 2被設計為不會丟失任何錯誤。 因此，當序列結束或被取消時，發射器無處發送錯誤，因此將其路由到RxJavaPlugins.onError 。
與1.x不同，默認情況下，2.x調用Thread.currentThread().getUncaughtExceptionHandler().uncaughtException()導致Android應用崩潰。

資源
類似的stackoverflow問題

在我的情況下，由於已經處置了訂戶，所以我不再關心發射器可能拋出的錯誤，因此，發射器應在調用onError()之前檢查是否已將其onError()

try {
      Submission submission = redditClient.getSubmission(sr);
      e.onSuccess(submission);
} catch (Exception ex) {
      if (!e.isDisposed()) {
           e.onError(ex);
      }
}