Expected error is raised only after second (identical) attempt

まず、HtmlDocumentBuilder、ThrowingErrorHandler、および issue にリンクされている Encoding ISO.html リソースを使って testHtmlIso を再現します。最初の parse(uri) とそのエラーハンドラーの設定を追跡します。壊れたドキュメント、または警告を生成するドキュメントが登録済みのハンドラーを発火させ、最初の同一の parse で例外をスローすれば完了です。

The following code throws only after second call to parse, instead of throwing upon first call as expected.

private static final class ThrowingErrorHandler implements ErrorHandler {
  @Override
  public void warning(SAXParseException exception) throws SAXParseException {
    LOGGER.info("Warning while processing.", exception);
    throw exception;
  }

  @Override
  public void fatalError(SAXParseException exception) throws SAXParseException {
    LOGGER.info("Fatal while processing.", exception);
    throw exception;
  }

  @Override
  public void error(SAXParseException exception) throws SAXParseException {
    LOGGER.info("Error while processing.", exception);
    throw exception;
  }
}

@Test
public void testHtmlIso() throws Exception {
  String uri = "https://github.com/oliviercailloux/JARiS/raw/refs/heads/main/src/test/resources/io/github/oliviercailloux/jaris/xml/Html/Encoding%20ISO.html";
  HtmlDocumentBuilder builder = new HtmlDocumentBuilder();
  builder.setErrorHandler(new ThrowingErrorHandler());
  // logs no warning, does not throw
  builder.parse(uri);
  builder.setErrorHandler(new ThrowingErrorHandler());
  // logs a warning then throws
  builder.parse(uri);
}

Explanation

The document is supposed to raise a warning when parsed, and given the registered ThrowingErrorHandler, it is supposed to log then throw an exception when parsing. But the first parse completes without logging or throwing anything. Only the second one does.