Append XML file using XMLOutputFactory method in Java

I am trying to write code that takes input from user and writes it in an XML file using XMLOutputFactory method. For that i had to open the file in append mode, but the problem here is that what i write the .xml file, the new information comes outside the closing config tag. This is bit mind boggling here as i have tried to spot the error but no luck. Help would be appreciated!

java code:

@Override
    public boolean insertBook(String title,String description,String authors,String isbn)
    {
        // create an XMLOutputFactory
        XMLOutputFactory outputFactory = XMLOutputFactory.newInstance();
        // create XMLEventWriter
        XMLEventWriter eventWriter = null;
        try 
        {
            eventWriter = outputFactory.createXMLEventWriter(new FileOutputStream(fileName , true));
            // create an EventFactory
            XMLEventFactory eventFactory = XMLEventFactory.newInstance();
            XMLEvent end = eventFactory.createDTD("\n");

            // create config open tag
            StartElement configStartElement = eventFactory.createStartElement("","", Book);

            eventWriter.add(configStartElement);
            eventWriter.add(end);

            // Write the different nodes
            createNode(eventWriter, Title, title);
            createNode(eventWriter, Description, description);
            createNode(eventWriter, Authors, authors);
            createNode(eventWriter, Isbn, isbn);

            eventWriter.add(eventFactory.createEndElement("", "", "config"));
            eventWriter.add(end);
            eventWriter.add(eventFactory.createEndDocument());
            eventWriter.close();
        }
        catch (XMLStreamException ex) 
        {
            Logger.getLogger(BookDAO.class.getName()).log(Level.SEVERE, null, ex);
            return false;
        } 
        catch (FileNotFoundException ex) 
        {
            Logger.getLogger(BookDAO.class.getName()).log(Level.SEVERE, null, ex);
            return false;
        }

        return true;
    }

    private void createNode(XMLEventWriter eventWriter, String name, String value) throws XMLStreamException 
    {
        XMLEventFactory eventFactory = XMLEventFactory.newInstance();
        XMLEvent end = eventFactory.createDTD("\n");
        XMLEvent tab = eventFactory.createDTD("\t");

        // create Start node
        StartElement sElement = eventFactory.createStartElement("", "", name);
        eventWriter.add(tab);
        eventWriter.add(sElement);

        // create Content
        Characters characters = eventFactory.createCharacters(value);
        eventWriter.add(characters);

        // create End node
        EndElement eElement = eventFactory.createEndElement("", "", name);
        eventWriter.add(eElement);
        eventWriter.add(end);
  }

And this is how it is entering in the XML File.