code: @Override
      protected void checkDataDefinitions(StreamTokenizer streamTokenizer) throws FSMParseException {
          if (acceptIndex == -1) {
              throw new FSMParseException(String.format(ACCEPT_NOT_FOUND, acceptingDataVariableName),
                                          streamTokenizer);
          }
      }
docs: Checks the data definition by ensuring the index in the state vector containing acceptance information is
  defined.
  
  @throws FSMParseException
  when the acceptance information could not be found.