public final ParallelFlux<T> doOnError(Consumer<? super Throwable> onError){
  Objects.requireNonNull(onError,"onError");
  return doOnSignal(this,null,null,onError,null,null,null,null,null);
}

public final ParallelFlux < T > doOnError ( Consumer < ? super Throwable > onError ) { Objects . requireNonNull ( onError , "onError" ) ; return doOnSignal ( this , null , null , onError , null , null , null , null , null ) ; }
call the specified consumer with the exception passing through any ' rail ' .
