Extra empty lines appear when saving the XML file


When saving an XML file in Java, multiple runs show that after each run, a line of white space is added between the elements, and the most recently inserted data is normal. How to solve this problem?

public class OperateXml {
    public static void main(String[] args) {
        DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
        try {
            DocumentBuilder builder = factory.newDocumentBuilder();
            Document document = builder.parse("src/main/resources/chunkInfo/chunk.xml");
            saveDocument(document, new File("src/main/resources/chunkInfo/chunk.xml"));
        } catch (Exception e) {


    public static void saveDocument(Document document, File xmlFile) {
        TransformerFactory tff = TransformerFactory.newInstance();
        tff.setAttribute("indent-number", 2);
        try {
            Transformer tf = tff.newTransformer();
            tf.setOutputProperty(OutputKeys.DOCTYPE_SYSTEM, "chunk.dtd");
            tf.setOutputProperty(OutputKeys.INDENT, "yes");
            tf.transform(new DOMSource(document), new StreamResult(xmlFile));
        } catch (TransformerConfigurationException e) {
        } catch (TransformerException e) {

    public static void add(Document document) {
        Element root = document.getDocumentElement();
        Element chunk = document.createElement("chunk");
        chunk.setAttribute("id", "id_8");
        Element name = document.createElement("name");
        Element type = document.createElement("type");
        Element item = document.createElement("item");

The result of saving XML file is: enter image description here

Thilo Schwarz

May be it's a result of a known bug in Java9 or later.

For further details see: https://bugs.openjdk.org/browse/JDK-8262285?attachmentViewMode=list

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Please contact [email protected] to delete if infringement.

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