Cannot parse node in XML file

Question

I have the following xml file:
<?xml version="1.0" encoding="UTF-8"?>
<model:test xmlns:model="bla">
  <Bounds>
    <Left>0.0</Left>
    <Top>0.0</Top>
    <Width>0.0</Width>
    <Height>0.0</Height>
  </Bounds>
</model:test>Now I try to parse this using the below code:
    DocumentBuilderFactory domFactory = DocumentBuilderFactory.newInstance();
    domFactory.setNamespaceAware(true);
    DocumentBuilder builder = null;
    try {
      builder = domFactory.newDocumentBuilder();
    } catch (ParserConfigurationException e) {
      e.printStackTrace();
    try {
      doc = builder.parse(new File(pathToData));
    } catch (SAXException e) {
      e.printStackTrace();
    } catch (IOException e) {
      e.printStackTrace();
    NodeList nodes = doc.getElementsByTagNameNS("model","test");
    Node node = nodes.item(0);
    if(node == null) {
      System.out.println("is null");
    System.out.println(nodes.getLength());  But the null test evaluates to true and it prints:
is null
I don't get any exceptions and also specify:
domFactory.setNamespaceAware(true);
so why is the node null?

Answer 1

The problem is here:
NodeList nodes = doc.getElementsByTagNameNS("model","test");"model" has absolutely no meaning in the DOM, it's simply a short name for the full URI of the namespace you use ("bla" in your example). You need to use this instead:
    NodeList nodes = doc.getElementsByTagNameNS("bla","test");To demonstrate the fact, the following XML would be effectively equivalent to the one you posted
<?xml version="1.0" encoding="UTF-8"?>
<foobar:test xmlns:foobar="bla">
  <Bounds>
    <Left>0.0</Left>
    <Top>0.0</Top>
    <Width>0.0</Width>
    <Height>0.0</Height>
  </Bounds>
</foobar:test>