DOM doc is not adding a ProcessingInstruction

[Dieter Stryker]

What am I doing wrong here that the ProcessingInstruction is not being added to the xmlDoc. All of my Elements are added with no issues...

public class XMLBuilder
{
	public static final File outputFile = new File("C:\\Test.xml");
	private Document xmlDoc;
	
	/**
	 * @return - XML object to main() to be written to flat file
	 */
	void buildScoresXML(TreeMap teamMap)
	throws Exception
	{	

		DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
		try
		{
			DocumentBuilder builder = factory.newDocumentBuilder();
			xmlDoc = builder.newDocument();
		}
		catch(ParserConfigurationException pCE)
		{
			pCE.printStackTrace();
		}

		FileWriter fstream = new FileWriter(outputFile);
		BufferedWriter out = new BufferedWriter(fstream);
		String cssURL = "\"CSS URL WILL BE HERE\"";
				
		// create root element
		Element rootElement = xmlDoc.createElement("lacrosse"); //has children
		xmlDoc.appendChild(rootElement);
		
		// add processing instruction for CSS file
		ProcessingInstruction pi = xmlDoc.createProcessingInstruction("xml-stylesheet", "test");
		xmlDoc.appendChild(pi);