Want to retrieve null value from xml?

Question

i m writing this code to get the tag name and values from xml file.
Now the problem is that
if my xml file contain any tag whose value is not defined like
<root>
<firsttag>first</firsttag>
<Second></Second><Third>third</Third>
</root>
Now look if second tag doesnt contain anything ,then i want to add "null" to vector,but it throws null pointer exception because second tag is empty.
Vector<String> CSWFinfo = new Vector<String>();
          try {
               DocumentBuilderFactory factory = DocumentBuilderFactory
                         .newInstance();
               DocumentBuilder builder = factory.newDocumentBuilder();
               Document doc = builder.parse(new File(xml));
               Element root = doc.getDocumentElement();
               NodeList node = root.getChildNodes();
               for (int i = 0; i < node.getLength(); i++) {
                    Node currentNode = node.item(i);
                    if (isTextNode(currentNode))
                         continue;
                    CSWFinfo.addElement(currentNode.getNodeName());
                    if (null != currentNode.getFirstChild().getNodeValue()) {
                         CSWFinfo.addElement(currentNode.getFirstChild()
                                   .getNodeValue());
                    } else {
                         CSWFinfo.addElement("null");
               }//end of for loop block
               System.out.println(CSWFinfo);
          } catch (Exception e) {
               e.printStackTrace();
               // TODO: handle exception
          }I am using dom parser .
Can any one know how to do it????
Edited by: chauhan2003 on 16 Jun, 2008 12:06 PM

Answer 1

Are you sure that all currentNode have a firstChild ????
If your node has no value, it has no child
So i 'd change code to like look something like:
if (currentNode.getFirstChild() != null) {
     CSWFinfo.addElement(currentNode.getFirstChild().getNodeValue());
} else {
     CSWFinfo.addElement("null");
}