public static <T> @NonNull CompletableFuture<T> immediateFailedFuture(final @NonNull Throwable ex) {
    final CompletableFuture<T> future = new CompletableFuture<>();
    future.completeExceptionally(ex);
    return future;
  }
public static < T > @ NonNull CompletableFuture < T > immediateFailedFuture ( final @ NonNull Throwable ex ) { final CompletableFuture < T > future = new CompletableFuture < > ( ) ; future . completeExceptionally ( ex ) ; return future ; }
Returns a completable future that is exceptionally completed with the provided exception.

@param ex the throwable
@param <T> the type
@return an exceptionally completed completable future