languagetool-org/languagetool · error

Found more than one spell rule:

Error message

Found more than one spell rule: 

What it means

UnknownWordFinderForCsv.getSpellingCheckRule mirrors UnknownWordFinder: it expects exactly one dictionary-based spelling rule among active rules and throws a RuntimeException when a second one is encountered, because the CSV variant also needs a single well-defined speller rule.

Source

Thrown at languagetool-dev/src/main/java/org/languagetool/dev/UnknownWordFinderForCsv.java:52

 * Print words from CSV that are unknown to the spell checker, sorted by number of occurrences.
 */
public class UnknownWordFinderForCsv {

  private void run(File dir, JLanguageTool lt) throws IOException {
    SpellingCheckRule spellerRule = getSpellingCheckRule(lt);
    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)) {

View on GitHub (pinned to 2e990059ce)

Solutions

1. Disable all but one dictionary-based spelling rule before calling getSpellingCheckRule
2. Run the tool for a language with a single active speller rule
3. Modify the script to tolerate multiple speller rules by picking one explicitly

Example fix

// before
SpellingCheckRule rule = getSpellingCheckRule(lt);
// after
lt.getAllActiveRules().stream().filter(Rule::isDictionaryBasedSpellingRule).skip(1).forEach(r -> lt.disableRule(r.getId()));
SpellingCheckRule rule = getSpellingCheckRule(lt);

long n = lt.getAllActiveRules().stream().filter(Rule::isDictionaryBasedSpellingRule).count();
if (n != 1) throw new IllegalStateException("Expected exactly 1 spelling rule, got " + n);

try { new UnknownWordFinderForCsv(...).run(); } catch (RuntimeException e) { if (e.getMessage().startsWith("Found more than one spell rule")) { System.err.println("Disable extra spelling rules for this language"); } }

When it happens

Trigger: Running UnknownWordFinderForCsv with a JLanguageTool whose active rule set contains two or more dictionary-based spelling rules.

Common situations: Languages with multiple active spell checkers; extra spelling rules enabled via custom config; behavior changes after adding new spelling rules to a language module.

Understand the failure class

Background: "This is a bug, please report it": internal invariant violations, unreachable panics, and SNH errors explained — this error's family across 47 libraries.

Related errors

• No speller rule found for
• 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/afe9f228af1470c6. Report an issue: GitHub.