How to create a Document object in Java?

I want to create a Document object with jdom. I have written a function but after I debug I can see that it is not created. and since I am new to XML I don't understand why I can not create. Can you please help me for that?

public Document createSNMPMessage (){

    Element root = new Element("message");
    Document document = new Document(root);

    Element header = new Element("header");

    Element messageType = new Element("messageType").setText("snmp");
    Element sendFrom = new Element("sendFrom").setText("192.168.0.16");
    Element hostName = new Element("hostName").setText("oghmasysMehmet");
    Element sendTo = new Element("sendTo").setText("192.168.0.12");
    Element receiverName = new 开发者_开发知识库Element("receiverName").setText("Mehmet");
    Element date = new Element("date").setText("03/10/2011");

    header.addContent(messageType);
    header.addContent(sendFrom);
    header.addContent(hostName);
    header.addContent(sendTo);
    header.addContent(receiverName);
    header.addContent(date);

    Element body = new Element("body");

    Element snmpType = new Element("snmpType").setText("getbulk");
    Element ip = new Element("ip").setText("127.0.0.1");
    Element port = new Element("port").setText("161");
    Element oids = new Element("oids");
    Element oid = new Element("oid").setText("1.3.6.1.2.1.1.3.0");
    oids.addContent(oid);
    Element community = new Element("community").setText("community");
    Element nR = new Element("nR").setText("0");
    Element mR = new Element("mR").setText("5");

    body.addContent(snmpType);
    body.addContent(ip);
    body.addContent(port);
    body.addContent(oids);
    body.addContent(community);
    body.addContent(nR);
    body.addContent(mR);

    return document;

}

When I create it, I convert it to string by using that function ;

    public String xmlToString(Document doc) {
    XMLOutputter outputter = new XMLOutputter(Format.getPrettyFormat());
    return outputter.outputString(doc);
}

and When I try to convert to string to see what is inside of the Document, i get;

<?xml version="1.0" encoding="UTF-8"?>
<message />

From what I can see, you are creating a Document object, and adding nodes to the header and body nodes, but these nodes are not being added to your Document object instance document.

I believe you would want to add these nodes to the root element, which is already added to your document.

So, you could add it to your document's root as shown below:

public Document createSNMPMessage (){

    Element root = new Element("message");
    Document document = new Document(root);

    Element header = new Element("header");

    ...
    ...

    Element body = new Element("body");

    ...
    ...

    root.addContent(header);  // NOTE THESE NEW LINES
    root.addContent(body);  // NOTE THESE NEW LINES

    return document;

}