code: protected void validateDelimiters(String rowDelimiter, String columnDelimiter) throws Exception {
          if (rowDelimiter.equals(columnDelimiter)) {
              throw new Exception(INVALID_DELIMITERS);
          }
          if (StringUtils.contains(columnDelimiter, rowDelimiter)) {
              throw new Exception(INVALID_ROW_DELIMITER);
          }
      }
docs: This method checks if the delimiters are equal and if the row delimiter is a substring of the column delimiter
  and throws an exception with the appropriate message.
  @param rowDelimiter
  @param columnDelimiter
  @throws Exception