Problem transforming SAX events

Question

The following code parses a CSV file creating SAX events. If no XSL file is passed, it correctly does an identity transform and creates output so my assumption is that the parsing is working OK. However if I pass an xsl file containing the identity transfromation, I get no output and no exceptions. This is frustrating. Any ideas would be appreciated.
String csvFileName = args[0];
String xsltFileName = (args.length < 2)?null:args[1];
TransformerFactory tranFactory = TransformerFactory.newInstance();
tranFactory.setErrorListener(new SimpleErrorListener());
if (!tranFactory.getFeature(SAXTransformerFactory.FEATURE)){
System.out.println("SAXTransformerFactory is not supported");
System.exit(1);
SAXTransformerFactory saxTranFactory = (SAXTransformerFactory)tranFactory;
TransformerHandler tranHandler = null;
try{
if (xsltFileName == null){
tranHandler = saxTranFactory.newTransformerHandler();
else{
StreamSource s = new StreamSource(new File(xsltFileName));
tranHandler = saxTranFactory.newTransformerHandler(s);
catch(javax.xml.transform.TransformerConfigurationException e){
e.printStackTrace();
System.exit(1);
try{          
FileWriter f = new FileWriter(new File(xsltFileName+".out"));
StreamResult r = new StreamResult(f);
tranHandler.setResult(r);
CSVXMLReader reader = new CSVXMLReader();
reader.setContentHandler(tranHandler);
reader.parse(new InputSource(new FileReader(csvFileName)));
f.flush();
}

Answer 1

first problem solved. The parse method was missing endDocument().
Now i get the following Exception:
java.lang.NullPointerException at org.apache.xalan.transformer.TransformerImpl.run(TransformerImpl.java:3174) at org.apache.xalan.transformer.TransformerHandlerImpl.endDocument(TransformerHandlerImpl.java:433)
at dpak.xml.CSVXMLReader.parse(CSVXMLReader.java:71)
at dpak.xml.CSVXMLReader.main(CSVXMLReader.java:120)
I am using XML Winter Pack release with xalan.jar and xerces.jar in the jre/ext directory.
Stuck again. Any help would be appreciated.