HIERARCHY_REQUEST_ERR while trying to add elements to xml file in a for loop

As the title suggests, I am trying to add elements to an xml doc using a for loop. I have an ArrayList of strings called names that I wish to iterate through, and for each name create a <user> element with attribute name and with a child <record> that has the attributes id, time, date, and project.

Unfortunately, if you scroll down in the code below to the createDoc() method, when I try to call doc.appendChild(user), I get the following error:

Exception in thread "main" org.w3c.dom.DOMException: HIERARCHY_REQUEST_ERR: An attempt was made to insert a node where it is not permitted. 
at org.apache.xerces.dom.CoreDocumentImpl.insertBefore(Unknown Source)
at org.apache.xerces.dom.NodeImpl.appendChild(Unknown Source)
at test.XMLwriter.createDoc(XMLwriter.java:131)
at test.XMLwriter.<init>(XMLwriter.java:116)
at test.TestRunner.main(TestRunner.java:33)

I have looked at a few questions on stackoverflow that have the same error, but they all seem to have occurred under completely different circumstances with respect to mine. My best guess is that this error has to do with the fact that I am trying to create too many parent elements at the same hierarchical level, but I am not sure and I have almost no experience with xml at all.

Here is the code:

public class XMLwriter {
private ArrayList<String> names;
private Document doc;
private Random rand;
private ArrayList<Element> users;

public XMLwriter() throws ParserConfigurationException, TransformerException{

    DocumentBuilderFactory docFactory = DocumentBuilderFactory.newInstance();
    DocumentBuilder docBuilder = docFactory.newDocumentBuilder();
    doc = docBuilder.newDocument();

    rand = new Random();
    users = new ArrayList<Element>();
    names = new ArrayList<String>();

    names.add("Ralph Wiggum");names.add("Mr. Hanky");names.add("Bulbasaur");
    names.add("Tyroil Smoochie Wallace");names.add("Scooby Doo");names.add("Neville Longbottom");
    names.add("Jabba the Hutt");names.add("Silky Johnson");names.add("Master Chief");
    names.add("Frodo Baggins");names.add("Clayton Bigsby");names.add("John Snow");
    names.add("Eric Cartman");names.add("Leoz Maxwell Jilliumz");names.add("Aslan");

    createDoc();
    generateFile();

}

public void createDoc(){
    for(int k = 0; k < names.size(); k++)
    {
        users.add(doc.createElement("user"));
    }
    for (int x = 0; x < names.size(); x++){

        //create the elements
        Element record = doc.createElement("record");
        users.get(x).appendChild(record);
        doc.appendChild(users.get(x));//The line that is throwing the error

        //create the attributes
        Attr name = doc.createAttribute("name");
        Attr date = doc.createAttribute("date");
        Attr project = doc.createAttribute("project");
        Attr time = doc.createAttribute("time");
        Attr id = doc.createAttribute("id");

        //give all of the attributes values
        name.setValue(names.get(x));
        date.setValue(new Date().toString());
        project.setValue("Project" + (rand.nextDouble() * 1000));
        time.setValue("" + rand.nextInt(10));
        id.setValue("" + (rand.nextDouble() * 10000));

        //assign the attributes to the elements
        users.get(x).setAttributeNode(name);
        record.setAttributeNode(date);
        record.setAttributeNode(project);
        record.setAttributeNode(time);
        record.setAttributeNode(id);


    }
}

public void generateFile() throws TransformerException{
    TransformerFactory transformerFactory = TransformerFactory.newInstance();
    Transformer transformer = transformerFactory.newTransformer();
    DOMSource source = new DOMSource(doc);
    StreamResult result = new StreamResult(new File("C:\\Users\\sweidenkopf\\workspace\\test\\testxml.xml"));

    // Output to console for testing
    // StreamResult result = new StreamResult(System.out);
    transformer.setOutputProperty(OutputKeys.INDENT, "yes");
    transformer.setOutputProperty("{http://xml.apache.org/xslt}indent-amount", "2");
    transformer.transform(source, result);
}

}

I wrote this code as sort of a proof of concept because I will eventually have to actually perform a similar operation, where I will have a list of objects, each of which I must add to an xml file by separating the object out into its constituent parts with get methods.

Can anyone help me resolve this error?