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DocumentBuilderFactory parser returns doc: [#document: null]

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Hi all-

I want to update an xml doc before I send it but can't get DocumentBuidlerFactory to work, even with a simple doc: e.g.
<?xml version="1.0" ?>

I've tried many combinations of setting various properties to DBF all to no avail.

my code:

DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
try {
String p = System.getProperty("javax.xml.parsers.DocumentBuilderFactory");
//this displays: JAXP: find factoryId =javax.xml.parsers.DocumentBuilderFactory
//JAXP: loaded from fallback value: com.sun.org.apache.xerces.internal.jaxp.DocumentBuilderFactoryImpl
//JAXP: created new instance of class com.sun.org.apache.xerces.internal.jaxp.DocumentBuilderFactoryImpl using ClassLoader: null
DocumentBuilder db = dbf.newDocumentBuilder();
//File f = new File(fn);
Document doc = db.parse(fn);
//this returns a doc with [#document: null]
NodeList nl = doc.getElementsByTagName("Address");
Node n = nl.item(0).getFirstChild();
// text.setLength(0);
// String docStr = getStringFromDocument(doc);
// if (null==docStr) {
// status = "Error on doc transform " + status;
// log.error(status);
// return status;
// }
// log.info(docStr);
// text.append(docStr);
} catch (Exception e) {
String status = "Exception on attempting to update Subscribe request " + e.getMessage();


Max Tomlinson
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My error -
there was nor problem with document: null which was my assumption.
I was imply not using the ns prefix when I tired to get elements by tagname.

Consider Paul's rocket mass heater.
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