I have simple application
[code]
import org.dom4j.Document;
import org.dom4j.DocumentHelper;
import org.dom4j.Element;
import org.dom4j.Document;
import org.dom4j.io.OutputFormat;
import org.dom4j.io.XMLWriter;
import java.io.FileWriter;
import java.io.IOException;

public class Foo {
   public Document createDocument() {
       Document document = DocumentHelper.createDocument();
       Element root = document.addElement( "root" );

       Element author1 = root.addElement( "author" )
           .addAttribute( "name", "James" )
           .addAttribute( "location", "UK" )
           .addText( "James Strachan" );

       Element author2 = root.addElement( "author" )
           .addAttribute( "name", "Bob" )
           .addAttribute( "location", "US" )
           .addText( "Bob McWhirter" );

       return document;
   }
  public static void main(String[] args){
    Foo ex = new Foo();
    try{
       FileWriter out = new FileWriter( "foo.xml" );
       Document document;
       document = ex.createDocument();
       document.write( out );
    }
    catch(IOException e){
       System.out.println("Unable to create file:" + e.getMessage());
    }
 }
}[/code]
and I also have [code]dom4j-1.6.1.jar[/code] in the same directory
I compiled the app with [code]javac Foo.java -classpath
dom4j-1.6.1.jar[/code] and got no errors, but when I run the code I
get this error[code]Exception in thread "main"
java.lang.NoClassDefFoundError: org/dom4j/DocumentHelper
       at Foo.createDocument(Foo.java:12)
       at Foo.main(Foo.java:32)
Caused by: java.lang.ClassNotFoundException: org.dom4j.DocumentHelper
    at java.net.URLClassLoader$1.run(URLClassLoader.java:200)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:276)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:251)
    at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:319)
    ... 2 more
[/code]  What am I doing wrong.  If I unjar the dom4j-1.6.1.jar the
class labeled DocumentHelper is there.
Thanks,