};
    Callable<@Nullable Void> completeExceptionallyRunnable =
        new Callable<@Nullable Void>() {
          final Exception failureCause = new Exception("setException");

          @Override
          public @Nullable Void call() {
            if (currentFuture.get().setException(failureCause)) {
              numSuccessfulSetCalls.incrementAndGet();
            }
            awaitUnchecked(barrier);
            return null;

        };
    Callable<@Nullable Void> completeExceptionallyRunnable =
        new Callable<@Nullable Void>() {
          final Exception failureCause = new Exception("setException");

          @Override
          public @Nullable Void call() {
            if (currentFuture.get().setException(failureCause)) {
              numSuccessfulSetCalls.incrementAndGet();
            }
            awaitUnchecked(barrier);
            return null;