Java Utililty Methods XML Document to String

StreamResult streamResult;
try {
    TransformerFactory factory = TransformerFactory.newInstance();
    Transformer transformer = factory.newTransformer();
    transformer.setOutputProperty(OutputKeys.INDENT, "yes");
    transformer.setOutputProperty("{http://xml.apache.org/xslt}indent-amount", "4");
    streamResult = new StreamResult(new StringWriter());
    DOMSource source = new DOMSource(document);
...

DOMImplementationLS domImplementation = (DOMImplementationLS) doc.getImplementation();
LSSerializer lsSerializer = domImplementation.createLSSerializer();
return lsSerializer.writeToString(doc);

try {
    doc.normalize();
    DOMSource domSource = new DOMSource(doc);
    StringWriter writer = new StringWriter();
    StreamResult result = new StreamResult(writer);
    TransformerFactory tf = TransformerFactory.newInstance();
    Transformer transformer = tf.newTransformer();
    transformer.setOutputProperty(OutputKeys.ENCODING, "UTF-8");
...

DOMSource domSource = new DOMSource(doc);
StringWriter writer = new StringWriter();
StreamResult result = new StreamResult(writer);
TransformerFactory transformerFactory = TransformerFactory.newInstance();
Transformer transformer = transformerFactory.newTransformer();
transformer.transform(domSource, result);
return writer.toString().substring(writer.toString().indexOf('>') + 1);

TransformerFactory transFac = TransformerFactory.newInstance();
Transformer transformer = transFac.newTransformer();
DOMSource source = new DOMSource(doc);
ByteArrayOutputStream bout = new ByteArrayOutputStream();
StreamResult result = new StreamResult(bout);
transformer.transform(source, result);
String xml = new String(bout.toByteArray());
bout.close();
...

DOMSource domSource = new DOMSource(doc);
StringWriter writer = new StringWriter();
StreamResult result = new StreamResult(writer);
TransformerFactory tf = TransformerFactory.newInstance();
Transformer transformer;
if (null != xslt) {
    DOMSource dxsltsource = new DOMSource(xslt);
    transformer = tf.newTransformer(dxsltsource);
...

DOMImplementationLS domImplementation = (DOMImplementationLS) doc.getImplementation();
LSSerializer lsSerializer = domImplementation.createLSSerializer();
return lsSerializer.writeToString(doc);

synchronized (xpath) {
    try {
        return xpath.evaluate(expression, doc);
    } catch (Exception e) {
        System.err.println("Error evaluating xpath expression: " + expression);
        e.printStackTrace();
    return "";
...

synchronized (xpath) {
    try {
        return getStringListFromXPath((Node) xpath.evaluate(rootNodeExpression, doc, XPathConstants.NODE),
                xpath, listExpression);
    } catch (Exception e) {
        System.err.println("Error evaluating xpath expression: " + rootNodeExpression);
        e.printStackTrace();
    return new Vector<String>();

StringBuilder sb = new StringBuilder();
NodeList nl = df.getChildNodes();
for (int i = 0; i < nl.getLength(); i++) {
    Node n = nl.item(i);
    sb.append(nodeToString(n));
return sb.toString();