private static boolean isNullPrimitivePsiType(@NotNull PsiField psiField) {
    return "NULL".equals(psiField.getName()) &&
           psiField.hasModifierProperty(PsiModifier.STATIC) &&
           psiField.hasModifierProperty(PsiModifier.FINAL) &&
           isPsiType(psiField.getContainingClass());
  }
private static boolean isNullPrimitivePsiType(@NotNull PsiField psiField)