code: protected static BufferedReader createFileReader(String file_name)
              throws BeastException {
          try {
              return new BufferedReader(new FileReader(file_name));
          } catch (FileNotFoundException e) {
              Logger logger = Logger.getLogger(MASReader.class.getName());
              logger.severe("ERROR: " + e.toString());
              throw new BeastException("ERROR: " + e.toString(), e);
          }
      }
docs: Method to read our client's plain text
  
  @param file_name
  @return the filereader to translate client's plain text into our files
  @throws BeastException
  if any problem is found whit the file