Urgent need for Adding Comments

Question

Hai,
I have to add a comment before the root node dynamically.
I am adding a comment dynamically by using the following code.
//Getting the docuement.
DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
DocumentBuilder db = dbf.newDocumentBuilder();
Document doc = db.parse("cd.xml");
//Getting the root element
Element rootElement = doc.getDocumentElement();
//creating the comment.
Comment comment = doc.createComment("A Document Comment");
//Adding comment before the root element.
rootElement.getParentNode().insertBefore(comment,rootElement);
//Transforming in to the xml file.
DOMSource ds = new DOMSource(rootElement);
StreamResult sr = new StreamResult(new java.io.File("cd.xml"));
TransformerFactory tFactory = TransformerFactory.newInstance();
Transformer trans = tFactory.newTransformer();
trans.transform(ds,sr);
Program is compiling and running sucessfully. But it is not getting added into the result XML File.

Answer 1

Document doc = db.parse("cd.xml");
//Getting the root element
Element rootElement = doc.getDocumentElement();
//Transforming in to the xml file.
DOMSource ds = new DOMSource(rootElement);...
trans.transform(ds,sr);The node you are using as parameter of the DOMSource constructor is the rootElement. The comment you insert before that element is, of course, before the rootElement object, so the DOMSource object should be created with the comment node as the constructor's input parameter.