Java Utililty Methods XML Transform

ByteArrayInputStream bais = new ByteArrayInputStream(input.getBytes());
Document doc = DocumentBuilderFactory.newInstance().newDocumentBuilder().parse(bais);
return doc;

XMLGregorianCalendar xmlGregorianCalendar;
SimpleDateFormat format = new SimpleDateFormat(pattern);
try {
    xmlGregorianCalendar = DatatypeFactory.newInstance().newXMLGregorianCalendar();
    Calendar calendar = Calendar.getInstance();
    calendar.setLenient(true);
    calendar.setTime(format.parse(dateTime));
    xmlGregorianCalendar.setYear(calendar.get(Calendar.YEAR));
...

String htmlResult = null;
try {
    StringWriter writer = new StringWriter();
    StringReader xsltReader = new StringReader(XSLT_TO_HTML);
    TransformerFactory tFactory = TransformerFactory.newInstance();
    Transformer transformer = tFactory
            .newTransformer(new javax.xml.transform.stream.StreamSource(xsltReader));
    transformer.transform(xmlStreamSource, new javax.xml.transform.stream.StreamResult(writer));
...

if (node.getNodeType() == Node.TEXT_NODE) {
    byte[] bytes = tranformTextNodeToByteArray(node);
    os.write(bytes);
} else {
    transformNonTextNodeToOutputStream(node, os, omitXmlDeclaration);

StringWriter writer = new StringWriter();
Transformer transformer;
try {
    if (xslSource == null) {
        transformer = TransformerFactory.newInstance().newTransformer();
    } else {
        transformer = TransformerFactory.newInstance().newTransformer(xslSource);
    transformer.setOutputProperty(OutputKeys.OMIT_XML_DECLARATION, "yes");
    transformer.transform(xmlSource, new StreamResult(writer));
    return writer.getBuffer();
} catch (Exception e) {
    e.printStackTrace();
    return writer.getBuffer();
} finally {
    try {
        writer.close();
    } catch (Exception e) {
        e.printStackTrace();

TransformerFactory tFactory = TransformerFactory.newInstance();
StringReader xmlreader = new StringReader(xml);
Transformer transformer = tFactory.newTransformer(new StreamSource(new File(xslFile)));
StringWriter output = new StringWriter();
transformer.transform(new StreamSource(xmlreader), new StreamResult(output));
return output.getBuffer().toString();

StringBuffer sb = null;
StringWriter writer = new StringWriter();
TransformerFactory tf = TransformerFactory.newInstance();
if (null != resolver) {
    tf.setURIResolver(resolver);
Transformer t = tf.newTransformer(xslSrc); 
if (params != null) {
...

if (xsl != null) {
    TransformerFactory tFactory = TransformerFactory.newInstance();
    Source xmlSource = new StreamSource(xml);
    Source xslSource = new StreamSource(xsl);
    Transformer transformer = tFactory.newTransformer(xslSource);
    StringWriter outputWriter;
    transformer.transform(xmlSource, new StreamResult(outputWriter = new StringWriter()));
    return outputWriter.getBuffer().toString();
...

StreamSource xsltSource = new StreamSource(xslFile.getPath());
TransformerFactory factory = TransformerFactory.newInstance();
Transformer transformer = factory.newTransformer(xsltSource);
try (ByteArrayOutputStream outputStream = new ByteArrayOutputStream()) {
    StreamResult result = new StreamResult(outputStream);
    transformer.transform(source, result);
    return outputStream;

if (name != null && content != null) {
    atts.clear();
    hd.startElement("", "", name, atts);
    hd.characters(content.toCharArray(), 0, content.length());
    hd.endElement("", "", name);