Q:

Set namespace using jdom

I would like have this format in xml: 
<ns2: test xmlns="url" xmlns:ns2="url2" xmlns:ns3="url3">
....
</ns2: test>

I am using the following code:
    Namespace ns= Namespace.getNamespace("url");
    Namespace ns2 = Namespace.getNamespace("ns2", "url2");
    Namespace ns3= Namespace.getNamespace("ns3", "url3");

    SAXBuilder vDocBuilder = new SAXBuilder();
    Document vDocument = vDocBuilder.build(File);

    System.out.println("Root element " + vDocument.getRootElement().getName());

    org.jdom. Element test = new org.jdom. Element("test", ns);
    vDocument.setRootElement(test);
    vNewRootElement.addNamespaceDeclaration(ns2);
    vNewRootElement.addNamespaceDeclaration(ns3);

If I set namespace with:
    vNewRootElement.setNamespace(ns3);

Then I get thi:s
    <ns2: test xmlns:ns2="url2" xmlns:ns3="url3"> ... </ns2: test> 
without the default namespace xmlns="url". 

Can anybody tell me why it dosen't work and is there a way to solve this problem? 
Thanks, haner

A:

The following outputs (to System.out)
<? xml version="1.0" encoding="UTF-8"? >
<ns2:test xmlns:ns2="url2" xmlns="url" xmlns:ns3="url3">Some text</ns2:test>

import java.io. IOException;
import org.jdom. Document;
import org.jdom. JDOMException;
import org.jdom. Namespace;
import org.jdom.output. XMLOutputter;

public class Test {

    public static void main(String args[]) throws JDOMException, IOException {
        Namespace ns = Namespace.getNamespace("url");
        Namespace ns2 = Namespace.getNamespace("ns2", "url2");
        Namespace ns3 = Namespace.getNamespace("ns3", "url3");

        Document vDocument = new Document();
        org.jdom. Element test = new org.jdom. Element("test", ns2);
        vDocument.setRootElement(test);
        //add "url" default namespace
        test.addNamespaceDeclaration(ns);
        test.addNamespaceDeclaration(ns2);
        test.addNamespaceDeclaration(ns3);
        test.addContent("Some text");
        //dump output to System.out
        XMLOutputter xo = new XMLOutputter();
        xo.output(vDocument, System.out);

    }
}

you need the line
   test.addNamespaceDeclaration(ns);

