languagetool-org/languagetool · error · RuntimeException

Could not load data from ${path}

Error message

Could not load data from ${path}

What it means

Generic I/O guard in StringTools.loadLines: reading the resource at the given path as UTF-8 lines failed. The input at fault is the classpath/resource path; the method is deprecated in favor of DataBroker#getFromResourceDirAsLines.

Source

Thrown at languagetool-core/src/main/java/org/languagetool/tools/StringTools.java:747

   * @since 4.6
   * @deprecated use DataBroker#getFromResourceDirAsLines(java.lang.String) instead (NOTE: it won't handle comments)
   */
  public static List<String> loadLines(String path) {
    InputStream stream = JLanguageTool.getDataBroker().getFromResourceDirAsStream(path);
    List<String> l = new ArrayList<>();
    try (
      InputStreamReader reader = new InputStreamReader(stream, StandardCharsets.UTF_8);
      BufferedReader br = new BufferedReader(reader)
    ) {
      String line;
      while ((line = br.readLine()) != null) {
        if (line.isEmpty() || line.charAt(0) == '#') {   // ignore comments
          continue;
        }
        l.add(line);
      }
    } catch (IOException e) {
      throw new RuntimeException("Could not load data from " + path, e);
    }
    return Collections.unmodifiableList(l);
  }

  /**
   * Will turn a string into a typical rule ID, i.e. uppercase and
   * "_" instead of spaces.
   *
   * All non-ASCII characters are replaced with "_", EXCEPT for
   * Latin-1 ranges U+00C0-U+00D6 and U+00D8-U+00DE.
   *
   * "de" locales have a special implementation (ä =&gt; ae, etc.).
   *
   * @param language LT language object, used to apply language-specific normalisation rules.
   *
   * @since 5.1
   */
  public static String toId(String input, Language language) {

View on GitHub (pinned to 2e990059ce)

Solutions

1. Confirm the resource exists at the given path in the resource dir
2. Check the file is readable and not corrupted
3. Migrate to DataBroker#getFromResourceDirAsLines, which is the supported loader

When it happens

Trigger: Thrown at languagetool-core/src/main/java/org/languagetool/tools/StringTools.java:747 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of languagetool-org/languagetool@2e990059ce (2026-09-06). Data as JSON: /api/errors/b73e7d6b40a31ac4. Report an issue: GitHub.