@Nullable
    @Override
    public String getErrorText(String inputString) {
      if (StringUtil.isEmpty(inputString)) {
        return null;
      }
      return !PsiNameHelper.getInstance(myProject).isIdentifier(inputString)
             ? JavaRefactoringBundle.message("replace.constructor.builder.error.identifier.invalid", inputString) : null;
    }
@Nullable
    @Override
    public String getErrorText(String inputString)