What's wrong with my XPath statement using dom4j?

Question

I'm pretty new to XML. However, I did pick up a book and I'm pretty much through it. I got a copy of dom4j and I created a sample XML file. I'm able to parse the data and find out the child elements of root but I'm having problems with using XPath no matter what I do. Here's my code:
import org.dom4j.*;
import org.dom4j.io.*;
import java.util.*;
import java.io.*;
public class XMLACL {
  org.dom4j.Document doc;
  org.dom4j.Element root;
  XMLACL(String x) {
    String tempFile = System.getProperty("user.dir") + "/winsudo.xml";
    tempFile = tempFile.replace('\\', '/');
    SAXReader xmlReader = new SAXReader();
    try {
      doc = xmlReader.read(tempFile);
    catch (Exception e) {}
    root = doc.getRootElement();
    //treeWalk();
    //iterateRootChildren("grant");
    XPath xpathSelector = DocumentHelper.createXPath("/grant[@prompt='no']");  
    List results = xpathSelector.selectNodes(doc);
    for (Iterator iter = results.iterator(); iter.hasNext(); ) {
     Element element = (Element) iter.next();
      System.out.println(element.getName());
}And here's my XML:
<?xml version="1.0" encoding="UTF-8"?>
<config>
     <alias name="admin">
          <user>geneanthony</user>
          <user>mike</user>
          <user>rob</user>
     </alias>
     <grant prompt="no" runas="root" service="no">
          <user>geneanthony</user>
          <command>!ALL</command>
     </grant>
     <grant>
          <user>geneanthony</user>
          <group>users</group>
          <command>C:/Program Files/Mozilla Firefox/firefox.exe</command>
     </grant>
     <grant>
          <alias>admin</alias>
          <command>!Panels</command>
     </grant>
</config>I'm currently getting this error:
C:\Borland\JBuilder2005\jdk1.4\bin\javaw -classpath "C:\code\java\WinSudo\classes;C:\Borland\JBuilder2005\jdk1.4\jre\javaws\javaws.jar;C:\Borland\JBuilder2005\jdk1.4\jre\lib\charsets.jar;C:\Borland\JBuilder2005\jdk1.4\jre\lib\ext\dnsns.jar;C:\Borland\JBuilder2005\jdk1.4\jre\lib\ext\ldapsec.jar;C:\Borland\JBuilder2005\jdk1.4\jre\lib\ext\localedata.jar;C:\Borland\JBuilder2005\jdk1.4\jre\lib\ext\sunjce_provider.jar;C:\Borland\JBuilder2005\jdk1.4\jre\lib\im\indicim.jar;C:\Borland\JBuilder2005\jdk1.4\jre\lib\im\thaiim.jar;C:\Borland\JBuilder2005\jdk1.4\jre\lib\jce.jar;C:\Borland\JBuilder2005\jdk1.4\jre\lib\jsse.jar;C:\Borland\JBuilder2005\jdk1.4\jre\lib\plugin.jar;C:\Borland\JBuilder2005\jdk1.4\jre\lib\rt.jar;C:\Borland\JBuilder2005\jdk1.4\jre\lib\sunrsasign.jar;C:\Borland\JBuilder2005\jdk1.4\lib\dt.jar;C:\Borland\JBuilder2005\jdk1.4\lib\htmlconverter.jar;C:\Borland\JBuilder2005\jdk1.4\lib\tools.jar;C:\Borland\JBuilder2005\jdk1.4\jre\lib\jRegistryKey.jar;C:\Borland\JBuilder2005\jdk1.4\lib\hsqldb.jar;C:\Borland\JBuilder2005\jdk1.4\jre\lib\dom4j-1.6.1.jar;C:\Borland\JBuilder2005\jdk1.4\jre\lib\syntax.jar;C:\Borland\JBuilder2005\jdk1.4\jre\lib\IzPack-install-3.7.2.jar" winsudo.Main
java.lang.NoClassDefFoundError: org/jaxen/JaxenException
     at org.dom4j.DocumentFactory.createXPath(DocumentFactory.java:230)
     at org.dom4j.DocumentHelper.createXPath(DocumentHelper.java:121)
     at winsudo.XMLACL.<init>(XMLACL.java:26)
     at winsudo.Main.main(Main.java:15)
Exception in thread "main"
Can someone tell me what's wrong with my code. None of the samples I've seen came with the XML files so I don't know if I when I start the XPATH I need to use / for the root element, or // or a forward slash and the root name. Can I please get some help!

Answer 1

Thank you! I didn't haven Jaxen I thought everything was in the package and I must have missed it in the tutorials. That resolved the dropouts and I think I'm good know. I couldn't think for the life of me what I was doing wrong!