Java Utililty Methods XML JAXB Unmarshaller

Unmarshaller unmarshaller = createUnmarshaller(packageName);
return unmarshaller.unmarshal(inputStream);

JAXBContext jaxbContext = JAXBContext.newInstance(clazz);
Unmarshaller unmarshaller = jaxbContext.createUnmarshaller();
return unmarshaller.unmarshal(new StringReader(string));

StringReader sr = null;
try {
    sr = new StringReader(xml.toString());
    return JAXB.unmarshal(sr, c);
} catch (DataBindingException e) {
    e.printStackTrace();
    return null;
} finally {
...

Unmarshaller unmarshaller = JAXBContext.newInstance(clazz).createUnmarshaller();
return clazz.cast(unmarshaller.unmarshal(new ByteArrayInputStream(xml.getBytes())));

return JAXB.unmarshal(new StringReader(xml), clazz);

JAXBContext ctx = JAXBContext.newInstance(entity.getClass());
Marshaller marshaller = ctx.createMarshaller();
StringWriter entityXml = new StringWriter();
marshaller.marshal(entity, entityXml);
String entityString = entityXml.toString();
return entityString;

Reader reader = null;
try {
    reader = new StringReader(xmlContent);
    JAXBContext context = JAXBContext.newInstance(clazz);
    return (T) context.createUnmarshaller().unmarshal(reader);
} catch (Exception e) {
    throw new RuntimeException(
            "Failed to unmarshal object for class:" + clazz + " xmlContent:" + xmlContent, e);
...

DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
DocumentBuilder db = dbf.newDocumentBuilder();
Document doc = db.parse(new ByteArrayInputStream(input));
return doc.getDocumentElement();

Object result = null;
JAXBContext jc = JAXBContext.newInstance(c);
Unmarshaller um = jc.createUnmarshaller();
result = um.unmarshal(reader);
return result;

JAXBContext context = JAXBContext.newInstance(clz);
Unmarshaller unmarshaller = context.createUnmarshaller();
T unobj = (T) unmarshaller.unmarshal(new StreamSource(new StringReader(input.toString())));
return unobj;