Serialize Xml to file in Java

import org.w3c.dom.Document;
import org.w3c.dom.Node;
import org.w3c.dom.ls.DOMImplementationLS;
import org.w3c.dom.ls.LSOutput;
import org.w3c.dom.ls.LSSerializer;

import java.io.IOException;
import java.io.Writer;

import java.util.Scanner;
import java.nio.file.Files;
import java.nio.file.Path;

import javax.xml.parsers.DocumentBuilderFactory;

public class XmlSerializer {
    public static void main(String[] args) throws Exception {
        String xml = "ROOT(PARAMS,PARAM1,PARAM2,PARAM3)";
        Scanner s = new Scanner(xml);
        s.useDelimiter("[(),\\s]");

        Document doc = DocumentBuilderFactory.newInstance().newDocumentBuilder().newDocument();

        Node root = doc.createElement(s.next());
        doc.appendChild(root);

        Node sheet = doc.createElement(s.next());
        root.appendChild(sheet);

        while (s.hasNext()) {
            Node param = doc.createElement(s.next());
            sheet.appendChild(param);
        }

        // Serialize to file in current directory
        XmlSerializer.saveToFile(doc, "x.xml");
    }

    public static void saveToFile(Document doc, String fileName) {
        try {
            DOMImplementationLS domImplementation = (DOMImplementationLS) doc.getImplementation();
            LSSerializer lsSerializer = domImplementation.createLSSerializer();
            // Absence of the following line causes a buggy xml declaration (no terminating line separator)
            lsSerializer.getDomConfig().setParameter("http://www.oracle.com/xml/jaxp/properties/isStandalone", Boolean.TRUE);
            lsSerializer.getDomConfig().setParameter("format-pretty-print", Boolean.TRUE);
            LSOutput output = domImplementation.createLSOutput();
            try (Writer out = Files.newBufferedWriter(Path.of(fileName))) {
                output.setEncoding("UTF-8");
                output.setCharacterStream(out);
                lsSerializer.write(doc, output);
            }
        } catch (IOException e) {
            throw new RuntimeException("Error serializing document", e);
        }
    }
}