Java EE (Java Enterprise Edition) General Discussion

I've decided to use JAXB in my web app as I've used it before (2 years ago). Before I started working on this web app, I upgraded to jdk1.6.0_07 with JAXB included and I'm using Netbeans 6.1 as my IDE.

I've got a very simple scenario in one Main.java that I can't get to the bottom of. I want to be able to unmarshal an XML file into a set of java objects and traverse through the object tree. I can get access to the root node of my XML structure. However, I keep failing to get the 2nd level of the hierarchy. I get an error about being unable to cast to com.sun.org.apache.xerces.internal.dom.ElementNSImpl (java.lang.ClassCastException: com.sun.org.apache.xerces.internal.dom.ElementNSImpl cannot be cast to generated.HierType
at javaapplication1.Main.main(Main.java:41)

Any help on how to traverse a tree would be greatly appreciated.


Here's my source code:

=======================================================
public class Main
{
    public static void main(String[] args)
    {
        System.out.println("hello world!");
        try
        {
            JAXBContext jc = JAXBContext.newInstance("generated");
            Unmarshaller u = jc.createUnmarshaller();
            File f = new File("document_list.xml");
            JAXBElement<?> hierElement = (JAXBElement<?>)u.unmarshal(new FileInputStream(f));
            HierType hierType = (HierType)hierElement.getValue();
            System.out.println("Root name : " + hierType.getName());
            ListIterator iter = hierType.getHier().listIterator();
            while(iter.hasNext())
            {
                HierType o = (HierType)iter.next();
                System.out.println(o.getName());
            }
        }
        catch (Exception e)
        {
            e.printStackTrace();
        }
    }
}

=======================================================
Here's the XML
=======================================================
<?xml version="1.0" encoding="UTF-8"?>
<hier name="Document Root">
    <hier name="level1">
        <hier name="level1.1">
        </hier>
    </hier>
    <hier name="level2">
    
    </hier>
    <hier name="level3">
    
    </hier>
</hier>

=======================================================
Here's the XSD
=======================================================
<?xml version="1.0" encoding="UTF-8"?>
<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema">

<xsd:element name="hier" type="HierType"/>

<xsd:complexType name="HierType">
    <xsd:sequence>
        <xsd:element name="hier" minOccurs="0" maxOccurs="unbounded"/>
    </xsd:sequence>
    <xsd:attribute name="name" type="xsd:string"/>
</xsd:complexType>

</xsd:schema>