JAXB and Inheritance

Question

I have this xsd :

    <?xml version="1.0" encoding="UTF-8"?>
<schema xmlns="http://www.w3.org/2001/XMLSchema" 
        targetNamespace="http://www.example.org/XsdMath2" 
        xmlns:tns="http://www.example.org/XsdMath2" 
        elementFormDefault="qualified">


    <complexType name="Utilisateur">
        <complexContent>
            <extension base="tns:TraitementDTO">
                <sequence>
                    <element name="nomUtilisateur" type="string"></element>
                    <element name="passUtilisateur" type="string"></element>
                </sequence>
            </extension>
        </complexContent>
    </complexType>

 <complexType name="TraitementDTO">
        <sequence>
            <element name="CodeTraitement" type="int"></element>
        </sequence>
    </complexType>


    <element name="Create" type="tns:TraitementDTO"></element>
</schema>

I would like to know data on my class "Utilisateur" but with my xml :

 <Create xmlns="http://www.example.org/XsdMath2">
       <TraitementDTO>
          <CodeTraitement>0</CodeTraitement>
            <Utilisateur>
               <nomUtilisateur>nomok</nomUtilisateur>
               <passUtilisateur>passok</passUtilisateur>
             </Utilisateur>
       </TraitementDTO>
    </Create>

I can't make (instanceof) my class "TraitementDTO" or i can't use function with my class "Utilisateur", or Cast. but it's not working. my code java :

 StringReader sr = new StringReader(this.message);
    JAXBContext context = JAXBContext.newInstance("ActionMathML");
    Unmarshaller decodeur = context.createUnmarshaller();
     msgObject = decodeur.unmarshal(sr);  

         System.out.println(" action" + msgObject);

     if (msgObject instanceof TraitementDTO)
    {
         System.out.println(" action");
    }

How I can take my Data because i try some solutions but it's not working. My Xsd is correct to retrieve my data ? Regards

Answer 1

Your XML does not match your XML Schema. If you populate your object model and then marshal it you will see what the XML is supposed to look like.

Marshal Example

MarshalDemo

package ActionMathML;

import javax.xml.bind.*;

public class MarshalDemo {

    public static void main(String[] args) throws Exception {
        JAXBContext context = JAXBContext.newInstance("ActionMathML");

        ObjectFactory objectFactory = new ObjectFactory();

        Utilisateur utilisateur = objectFactory.createUtilisateur();
        utilisateur.setCodeTraitement(0);
        utilisateur.setNomUtilisateur("nomok");
        utilisateur.setPassUtilisateur("passok");

        JAXBElement<TraitementDTO> jaxbElement = objectFactory.createCreate(utilisateur);

        Marshaller marshaller = context.createMarshaller();
        marshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, true);
        marshaller.marshal(jaxbElement, System.out);
    }

}

Output

Below is what the XML should look like based on your XML schema.

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<Create xmlns="http://www.example.org/XsdMath2" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:type="Utilisateur">
    <CodeTraitement>0</CodeTraitement>
    <nomUtilisateur>nomok</nomUtilisateur>
    <passUtilisateur>passok</passUtilisateur>
</Create>

Unmarshal Example

input.xml

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<Create xmlns="http://www.example.org/XsdMath2" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:type="Utilisateur">
    <CodeTraitement>0</CodeTraitement>
    <nomUtilisateur>nomok</nomUtilisateur>
    <passUtilisateur>passok</passUtilisateur>
</Create>

UnmarshalDemo

package ActionMathML;

import java.io.File;
import javax.xml.bind.*;

public class UnmarshalDemo {

    public static void main(String[] args) throws Exception {
        JAXBContext context = JAXBContext.newInstance("ActionMathML");

        Unmarshaller unmarshaller = context.createUnmarshaller();
        File xml = new File("src/ActionMathML/input.xml");
        JAXBElement<TraitementDTO> jaxbElement = (JAXBElement<TraitementDTO>) unmarshaller.unmarshal(xml);

        TraitementDTO traitementDTO = jaxbElement.getValue();
        System.out.println(traitementDTO.getCodeTraitement());

        if(traitementDTO instanceof Utilisateur) {
            Utilisateur utilisateur = (Utilisateur) traitementDTO;
            System.out.println(utilisateur.getNomUtilisateur());
            System.out.println(utilisateur.getPassUtilisateur());
        }
    }

}

Output

0
nomok
passok

For More Information

I have written more about JAXB and inheritance on my blog:

• http://blog.bdoughan.com/2010/11/jaxb-and-inheritance-using-xsitype.html