languagetool-org/languagetool · error · RuntimeException

Not implemented

Error message

Not implemented

What it means

The inner rule object in GrammalecteRule only carries metadata (id, description) fetched from the remote Grammalecte server; actual matching is delegated to remote calls elsewhere. Its local match(AnalyzedSentence) method is intentionally unimplemented and always throws this RuntimeException if called directly.

Solutions

1. Do not call match() on this rule; rely on GrammalecteRule's remote fetching (ruleMatches) instead.
2. If you need local execution, remove the Grammalecte rule from the local rule list or guard it behind remote-rule activation settings.
3. In tests, stub the remote call rather than invoking the inner rule's match().

if (rule instanceof GrammalecteRule.InnerRule) {
    throw new UnsupportedOperationException("This rule only matches remotely; do not call match()");
}

boolean isRemoteOnly = rule.getClass().getName().contains("GrammalecteRule");
if (isRemoteOnly) { /* skip local match(); use remote path */ }

try { return rule.match(sentence); } catch (RuntimeException e) { if (e.getMessage().equals("Not implemented")) return new RuleMatch[0]; throw e; }

When it happens

Trigger: Any code path invokes match(AnalyzedSentence) on the Grammalecte inner rule instance — e.g. registering the rule in a normal (local) rule set where the engine runs every rule's match() instead of the remote-detection code path.

Common situations: Developers adding the Grammalecte rule to a JLanguageTool instance directly; tests invoking match(); custom pipelines that iterate all rules locally, unaware this rule is remote-only.

Related errors

• No 'data' found in grammalecte JSON: " + map
• AbstractAdvancedSynthesizerFilter only works with pattern…
• beolingusFile not found:
• Cannot use premiumOnly=true with non-premium version
• Chinese language expected, got

AI-assisted analysis of languagetool-org/languagetool@2e990059ce (2026-09-06). Data as JSON: /api/errors/5266b954c41101f9. Report an issue: GitHub.

Appendix: source

Thrown at languagetool-language-modules/fr/src/main/java/org/languagetool/rules/fr/GrammalecteRule.java:712

    GrammalecteInternalRule(String id, String desc) {
      this.id = id;
      this.desc = desc;
    }

    @Override
    public String getId() {
      return id;
    }

    @Override
    public String getDescription() {
      return desc;
    }

    @Override
    public RuleMatch[] match(AnalyzedSentence sentence) {
      throw new RuntimeException("Not implemented");
    }
  }

}

View on GitHub (pinned to 2e990059ce)