View difference between Paste ID: XL7932aC and GA6kUB1a

 import java.io.ByteArrayInputStream;
 
 import javax.xml.parsers.DocumentBuilderFactory;
 
 import org.w3c.dom.Node;
 import org.w3c.dom.bootstrap.DOMImplementationRegistry;
 import org.w3c.dom.ls.DOMImplementationLS;
 import org.w3c.dom.ls.LSSerializer;
 
 public class XMLBeautifier {
    Node document;
    boolean keepDeclaration;
 
    public XMLBeautifier(String xml) {
       try {
          this.document = DocumentBuilderFactory.newInstance().newDocumentBuilder().parse(new ByteArrayInputStream(xml.getBytes())).getDocumentElement();
          this.keepDeclaration = xml.startsWith("<?xml");
       } catch (Exception e) {
          e.printStackTrace();
       }
    }
 
    public String getXML() {
       try {
          DOMImplementationRegistry registry = DOMImplementationRegistry.newInstance();
          DOMImplementationLS impl = (DOMImplementationLS)registry.getDOMImplementation("LS");
          LSSerializer writer = impl.createLSSerializer();
-         writer.getDomConfig().setParameter("xml-declaration", false); // Set this to true if the declaration is needed to be outputted.
+
          writer.getDomConfig().setParameter("format-pretty-print", true); // Set this to true if the output needs to be beautified.
          writer.getDomConfig().setParameter("xml-declaration", keepDeclaration); // Set this to true if the declaration is needed to be outputted.
 
          return writer.writeToString(document);
       } catch (Exception e) {
          e.printStackTrace();
          return null;
       }
    }
 
    public static void main(String[] args) {
       String xml = "<shiporder orderid=\"889923\" xmlns:xsi=\"http://www.w3.org/2001/XMLSchema-instance\" xsi:noNamespaceSchemaLocation=\"shiporder.xsd\"><orderperson>John Smith</orderperson><shipto><name>Ola Nordmann</name><address>Langgt 23</address><city>4000 Stavanger</city><country>Norway</country></shipto><item><title>Empire Burlesque</title><note>Special Edition</note><quantity>1</quantity><price>10.90</price></item><item><title>Hide your heart</title><quantity>1</quantity><price>9.90</price></item></shiporder>";
 
       System.out.println(new XMLBeautifier(xml).getXML());
    }
 }
 
 ------------------------ CONSOLE -------------------------
 <shiporder orderid="889923" xmlns:xsi="w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="shiporder.xsd">
     <orderperson>John Smith</orderperson>
     <shipto>
         <name>Ola Nordmann</name>
         <address>Langgt 23</address>
         <city>4000 Stavanger</city>
         <country>Norway</country>
     </shipto>
     <item>
         <title>Empire Burlesque</title>
         <note>Special Edition</note>
         <quantity>1</quantity>
         <price>10.90</price>
     </item>
     <item>
         <title>Hide your heart</title>
         <quantity>1</quantity>
         <price>9.90</price>
     </item>
 </shiporder>