Build XML with DOM

Question

Why does this loop works well if I COMMENT OUT the second node -
but I get a NULL document if I try to add the second node ?
//Loop through the result set
for (int i=0; i < iRows; i++) {
System.out.println(result.getString("SiteID"));
Node newSiteIDNode = document.createElement("SiteID");
Text tnSiteIDNode = document.createTextNode(result.getString("SiteID"));
newSiteIDNode.appendChild(tnSiteIDNode);
root.appendChild(newSiteIDNode);
Node newItemNode = document.createElement("ItemCode");
Text tnItemNode = document.createTextNode(result.getString("ItemCode"));
newItemNode.appendChild(tnItemNode);
root.appendChild(newItemNode);

Answer 1

The XML file that I'm creating via the following is empty
TransformerFactory transFactory =TransformerFactory.newInstance();
Transformer transformer = transFactory.newTransformer();
// Using the DOM tree root node, the following line of code constructs a DOMSource object as the source of the transformation.
DOMSource source = new DOMSource(document);
// The following code fragment creates a StreamResult object to take the results of the transformation
// and transforms the tree into an XML file.
newXML = new File("FTHSites.xml");
FileOutputStream os = new FileOutputStream(newXML);
resultXML = new StreamResult(os);
transformer.transform(source, resultXML);