[jdom-interest] java.lang.IllegalStateException

[Malachi de AElfweald]

Try something like this:

			JDOMResult result = new JDOMResult();
			transformer.transform(new JDOMSource(in), result);
			Document doc = result.getDocument();


10/13/2002 6:39:08 AM, "Robert Douglass" <r.douglass at onlinehome.de> wrote:

>Hello JDOM list,
>
>I'm getting the following error
>
>java.lang.IllegalStateException: Root element not set
>	at org.jdom.Document.getContent(Document.java:332)
>	at org.jdom.output.XMLOutputter.output(XMLOutputter.java:794)
>	at org.jdom.output.XMLOutputter.output(XMLOutputter.java:585)
>	at sbpgames.util.XmlUtil.applyXPath(XmlUtil.java:39)
>	at sbpgames.util.XmlUtil.main(XmlUtil.java:128)
>
>when I attempt to use XMLOutputter.output on a document that is a result of
>an in memory Transformer transformation. The main method (at the bottom)
>creates a Document and passes that, along with an XPath expression as a
>String to applyXPath (first method in the class). applyXPath creates a xsl
>document that matches / and selects the XPath expression fed to it.  This
>stylesheet and the xml document are then fed to transform(JDOMSource in,
>Source stylesheet, which returns a Document. If I change this line in the
>transform method
>
>	JDOMResult out = new JDOMResult();
>
>to
>
>	Result out = new StreamResult(System.out);
>
>then I see that the transformation is working as expected. Therefore, I
>suspect that I don't understand what happens to out in
>transformer.transform(in, out);
>
>I'm new to this technology, so I realize my error could be anywhere, and
>that this is a long chunk of code. Therefore I am very grateful to anybody
>who has the time to look at it.
>
>-Robert Douglass
>
>
>
>public class XmlUtil {
>	private static XMLOutputter xmlOutputter = new XMLOutputter("  ", true);
>
>	public static synchronized Document applyXPath(Document doc, String path) {
>		Document result = null;
>		try {
>			JDOMSource xmlSource = new JDOMSource(doc);
>			// returns a stylesheet that matches / and selects the path in "path"
>			Document xsltSourceDoc = getStyleSheetWithTemplateElement(path);
>			Source xsltSource = new JDOMSource(xsltSourceDoc);
>
>			// output the two documents to System.out
>			System.out.println("doc:");
>			xmlOutputter.output(doc, System.out);
>			System.out.println("xsltSourceDoc:");
>			xmlOutputter.output(xsltSourceDoc, System.out);
>
>			// transformation
>			result = transform(xmlSource, xsltSource);
>		} catch (Exception e) {
>			e.printStackTrace();
>		}
>		return result;
>	}
>	public static synchronized Document transform(
>		JDOMSource in,
>		Source stylesheet)
>		throws JDOMException {
>		try {
>			Transformer transformer =
>				TransformerFactory.newInstance().newTransformer(stylesheet);
>			JDOMResult out = new JDOMResult();
>			transformer.transform(in, out);
>			return out.getDocument();
>		} catch (TransformerException e) {
>			throw new JDOMException("XSLT Trandformation failed", e);
>		}
>	}
>
>	public static synchronized Document getStyleSheetWithTemplateElement(String
>path) {
>		Document result = getEmptyXmlStyleSheet();
>		Element templateElement =
>			new Element("template", result.getRootElement().getNamespace());
>		templateElement.setAttribute("match", "/");
>		Element valueOfTemplate =
>			new Element("value-of", result.getRootElement().getNamespace());
>		valueOfTemplate.setAttribute("select", path);
>		templateElement.addContent(valueOfTemplate);
>		result.getRootElement().addContent(templateElement);
>		return result;
>	}
>
>	public static synchronized Document getEmptyStyleSheet() {
>		Element root =
>			new Element(
>				"stylesheet",
>				"xsl",
>				"http://www.w3.org/1999/XSL/Transform");
>		root.setAttribute("version", "1.0");
>		Document result = new Document(root);
>		return result;
>	}
>
>	public static synchronized Document getEmptyXmlStyleSheet() {
>		Document result = getEmptyStyleSheet();
>		result = addOutputElement(result, "xml");
>		return result;
>	}
>
>	private static synchronized Document addOutputElement(
>		Document result,
>		String method) {
>		Element outputElement =
>			new Element("output", result.getRootElement().getNamespace());
>		outputElement.setAttribute("method", method);
>		result.getRootElement().addContent(outputElement);
>		return result;
>	}
>
>	public static void main(String[] args) {
>		try {
>			// create a simple XML document
>			Element root = new Element("Dog");
>			Element node = new Element("Name");
>			node.setAttribute("Age", "7");
>			node.setText("Fifi");
>			root.addContent(node);
>			Document doc = new Document(root);
>
>			// goal is to get "7" from above
>			Document pathApplied = applyXPath(doc, "/Dog/Name/@*");
>
>/////////////////// error produced here //////////////////////
>			xmlOutputter.output(pathApplied, System.out);
>//////////////////////////////////////////////////////////////
>		} catch (IOException e) {
>			e.printStackTrace();
>		}
>	}
>
>}
>
>_______________________________________________
>To control your jdom-interest membership:
>http://lists.denveronline.net/mailman/options/jdom-interest/youraddr@yourhost.com
>
>