<?xml version='1.0' encoding='UTF-8' ?>
<config>
  <Connections>
    <DbMetaData tablePrefix="example"/>
    <Date>inOut</Date>
    <AGSConnection
                  outputDirectory="C:directory2directoriesisoutput"
                  virtualOutputDirectory="https://directory1.example1.net/ex/rest/output"/>
    <SDEConnection
                  server="srv01"
                  instance="sde:sqlserver:srv01"
                  database="DBex"
                  authenticationMode="DBMS"
                  user="user1"
                  password="pass123"
                  version="sde.DEFAULT"
                  sdeConnectionPath="C:\tmp\ex\conexion\ser01.sde"/>
 </Connections>
 </config>

File file = new File(fileXML);
            DocumentBuilder dBuilder=DocumentBuilderFactory.newInstance().newDocumentBuilder();
            doc = dBuilder.parse(file);
            XPath xPath = XPathFactory.newInstance().newXPath();
            String expression = "/config/Connections/SDEConnnection/server";
            NodeList nodes = (NodeList)xPath.evaluate(pathNodo,doc, XPathConstants.NODESET);
            for (int idx = 0; idx < nodes.getLength(); idx++) {
                Node node = nodes.item(idx);
                node.setTextContent(valorNodo);
            }
            Transformer transformer = TransformerFactory.newInstance().newTransformer();
            transformer.transform(new DOMSource(doc), new StreamResult(new File("C:/test.xml")));