languagetool-org/languagetool · error · RuntimeException

Could not parse XML: + completeWikiContent

Error message

Could not parse XML: + completeWikiContent

What it means

Parsing guard in getRevisionContent: the XML fetched from the MediaWiki API could not be parsed by the SAX parser, i.e. the response is not the expected MediaWiki export/rev format (API error page, HTML, truncated body).

Source

Thrown at languagetool-wikipedia/src/main/java/org/languagetool/dev/wikipedia/WikipediaQuickCheck.java:229

    return wikiContent
        .replaceAll("\\[\\[[a-z]{2,6}:.*?\\]\\]", "")
        // category links
        .replaceAll(
            "\\[\\[:?(Category|Categoria|Categoría|Catégorie|Kategorie):.*?\\]\\]", "")
        // file links, keeps alt and caption
        .replaceAll(
            "(File|Fitxer|Fichero|Ficheiro|Fichier|Datei):.*?\\.(png|jpg|svg|jpeg|tiff|gif|PNG|JPG|SVG|JPEG|TIFF|GIF)\\|((thumb|miniatur)\\|)?((right|left)\\|)?", "");
  }

  private MediaWikiContent getRevisionContent(String completeWikiContent) {
    SAXParserFactory factory = SAXParserFactory.newInstance();
    SAXParser saxParser;
    RevisionContentHandler handler = new RevisionContentHandler();
    try {
      saxParser = factory.newSAXParser();
      saxParser.parse(new InputSource(new StringReader(completeWikiContent)), handler);
    } catch (Exception e) {
      throw new RuntimeException("Could not parse XML: " + completeWikiContent, e);
    }
    return new MediaWikiContent(handler.getRevisionContent(), handler.getTimestamp());
  }

  private MultiThreadedJLanguageTool getLanguageTool(Language lang) throws IOException {
    MultiThreadedJLanguageTool lt = new MultiThreadedJLanguageTool(lang);
    enableWikipediaRules(lt);
    for (String disabledRuleId : disabledRuleIds) {
      lt.disableRule(disabledRuleId);
    }
    if (ngramDir != null) {
      lt.activateLanguageModelRules(ngramDir);
    }
    disableSpellingRules(lt);
    return lt;
  }

  private void enableWikipediaRules(JLanguageTool lt) {

View on GitHub (pinned to 2e990059ce)

Solutions

1. Inspect the fetched XML around the failure point
2. Check the MediaWiki API endpoint and parameters are correct
3. Handle API error responses before parsing

When it happens

Trigger: Thrown at languagetool-wikipedia/src/main/java/org/languagetool/dev/wikipedia/WikipediaQuickCheck.java:229 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/c011570390c20a91. Report an issue: GitHub.