src/main/java/io/reactivex/Single.java
@CheckReturnValue
    @NonNull
    @SchedulerSupport(SchedulerSupport.NONE)
    public static <T> Single<T> error(final Callable<? extends Throwable> errorSupplier) {
        ObjectHelper.requireNonNull(errorSupplier, "errorSupplier is null");
        return RxJavaPlugins.onAssembly(new SingleError<T>(errorSupplier));
    }
@CheckReturnValue
    @NonNull
    @SchedulerSupport(SchedulerSupport.NONE)
    public static <T> Single<T> error(final Callable<? extends Throwable> errorSupplier) {
        ObjectHelper.requireNonNull(errorSupplier, "errorSupplier is null");
        return RxJavaPlugins.onAssembly(new SingleError<T>(errorSupplier));
    }
@ CheckReturnValue @ NonNull @ SchedulerSupport ( SchedulerSupport . NONE ) public static < T > Single < T > error ( final Callable < ? extends Throwable > errorSupplier ) { ObjectHelper . requireNonNull ( errorSupplier , "errorSupplier is null" ) ; return RxJavaPlugins . onAssembly ( new SingleError < T > ( errorSupplier ) ) ; }
Signals a Throwable returned by the callback function for each individual SingleObserver.
<p>
<img width="640" height="283" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/Single.error.c.png" alt="">
<dl>
<dt><b>Scheduler:</b></dt>
<dd>{@code error} does not operate by default on a particular {@link Scheduler}.</dd>
</dl>
@param <T> the value type
@param errorSupplier the callable that is called for each individual SingleObserver and
returns a Throwable instance to be emitted.
@return the new Single instance
Signals a Throwable returned by the callback function for each individual SingleObserver . <p > <img width = 640 height = 283 src = https : // raw . github . com / wiki / ReactiveX / RxJava / images / rx - operators / Single . error . c . png alt = > <dl > <dt > <b > Scheduler : < / b > < / dt > <dd > {