public static @NotNull Nullability getNullability(@NotNull PsiModifierListOwner owner) {
    NullabilityAnnotationInfo info = getInstance(owner.getProject()).findEffectiveNullabilityInfo(owner);
    return info == null ? Nullability.UNKNOWN : info.getNullability();
  }
public static @NotNull Nullability getNullability(@NotNull PsiModifierListOwner owner)