code: public Map<String, List<String>> loadWords(String path) {
      InputStream stream = JLanguageTool.getDataBroker().getFromRulesDirAsStream(path);
      Map<String, List<String>> map = new HashMap<>();
      try (Scanner scanner = new Scanner(stream, "utf-8")) {
        while (scanner.hasNextLine()) {
          String line = scanner.nextLine();
          if (line.isEmpty() || line.charAt(0) == '#') { // # = comment
            continue;
          }
          String[] parts = line.split("=");
          if (parts.length != 2) {
            throw new RuntimeException("Could not load simple replacement data from: " + path + ". " +
                    "Error in line '" + line + "', expected format 'word=replacement'");
          }
          String[] wrongForms = parts[0].split("\\|");
          List<String> replacements = Arrays.asList(parts[1].split("\\|"));
          for (String wrongForm : wrongForms) {
            map.put(wrongForm, replacements);
          }
        }
      }
      return Collections.unmodifiableMap(map);
    }
docs: Load replacement rules from a utf-8 file in the classpath.