Problem in Java extension module

  @Requires(Permission.NONE)
  @Deterministic
  @ContextDependent
  public Value element() throws QueryException, ParserConfigurationException
  {
    // Make a DOM document.
    DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
    factory.setNamespaceAware(true);
    DocumentBuilder builder = factory.newDocumentBuilder();
    Document domDocument = builder.newDocument();
    // Construct an element <test xmlns:test="http://test" test:attr="test"/>.
    Element outputElement = domDocument.createElement("test");
    outputElement.setAttributeNS("http://test", "test:attr", "test");
    // The namespace declaration must be set as a (pseudo-)attribute.
    outputElement.setAttributeNS("http://www.w3.org/2000/xmlns/", "xmlns:test", "http://test");
    // Returning `outputElement`, or converting it to BaseX first, loses the attribute namespace URI.
    //return JavaCall.toValue(inputElement, queryContext, null);
    // Make the new element the root element of the document. This is needed to get attribute namespaces.
    domDocument.appendChild(outputElement);
    // Converting the root element to BaseX does not work:
    //Value bxResult = JavaCall.toValue(domDocument.getDocumentElement(), queryContext, null);
    // Converting the document to BaseX and taking the root element works:
    ANode bxResult = (ANode)JavaCall.toValue(domDocument, queryContext, null);
    // Return the root element.
    return bxResult.childIter().next();
  }