languagetool-org/languagetool · error

No speller rule found for

Error message

No speller rule found for 

What it means

UnknownWordFinderForCsv.getSpellingCheckRule throws a RuntimeException when no dictionary-based spelling rule is active for the given JLanguageTool language, listing the language in the message. Without a speller rule the CSV unknown-word scan cannot proceed.

Source

Thrown at languagetool-dev/src/main/java/org/languagetool/dev/UnknownWordFinderForCsv.java:58

    List<Path> files = Files.walk(dir.toPath()).filter(Files::isRegularFile).collect(Collectors.toList());
    for (Path file : files) {
      handle(file, spellerRule);
    }
  }

  @NotNull
  private SpellingCheckRule getSpellingCheckRule(JLanguageTool lt) {
    SpellingCheckRule spellerRule = null;
    for (Rule rule : lt.getAllActiveRules()) {
      if (rule.isDictionaryBasedSpellingRule()) {
        if (spellerRule != null) {
          throw new RuntimeException("Found more than one spell rule: " + rule + ", " + spellerRule);
        }
        spellerRule = (SpellingCheckRule) rule;
      }
    }
    if (spellerRule == null) {
      throw new RuntimeException("No speller rule found for " + lt.getLanguage());
    }
    return spellerRule;
  }

  private void handle(Path f, SpellingCheckRule rule) throws IOException {
    int i = 0;
    if (f.toString().toLowerCase().endsWith(".csv")) {
      List<String> lines = Files.readAllLines(f);
      for (String line : lines) {
        String[] parts = line.split(",");
        String word = parts[0].replace("\"", "");
        if (rule.isMisspelled(word)) {
          System.out.println(line);
          i++;
        }
      }
    } else {
      System.out.println("Ignoring " + f + ": unknown suffix");

View on GitHub (pinned to 2e990059ce)

Solutions

1. Enable the language's dictionary-based spelling rule
2. Run the tool only for languages that have a speller rule
3. Check lt.getAllActiveRules() for an isDictionaryBasedSpellingRule() rule before invoking

if (lt.getAllActiveRules().stream().noneMatch(Rule::isDictionaryBasedSpellingRule)) {
  throw new IllegalStateException("No spelling rule active for " + lt.getLanguage());
}

try { new UnknownWordFinderForCsv(...).run(); } catch (RuntimeException e) { if (e.getMessage().startsWith("No speller rule found")) { System.err.println("Enable a spelling rule for this language or skip it"); } }

When it happens

Trigger: Running UnknownWordFinderForCsv for a language with no active dictionary-based spelling rule (rule missing or disabled).

Common situations: Languages without a spelling rule module; custom configs disabling spelling; passing the wrong Language object.

Understand the failure class

Background: EmptyResultError / "no results found": when an API or scraper succeeds but returns zero rows — this error's family across 9 libraries.

Related errors

• Found more than one spell rule:
• Found more than one spell rule:
• No speller rule found for
• No rules are active. Please make sure your rule ids (<option
• Could not activate rules

AI-assisted analysis of languagetool-org/languagetool@2e990059ce (2026-09-06). Data as JSON: /api/errors/2e80be78666fed5e. Report an issue: GitHub.