JAXB: class exception, but class has one name

I have an interesting problem.

When I started the GlassFish server, everything worked fine. But I changed the code and published the server, and I started my client ( SistemGirisClientKullaniciDogrula). The application throws this exception:

java.lang.ClassCastException: tr.com.app.Kullanici cannot be cast to tr.com.app.Kullanici.

The interesting part, after restarting the Glassfish server, the application works fine.

I am using restlet-spring-hibernate. And I also use JAXB (org.restlet.ext.jaxb.jar) to convert XML objects to Java. My application server - Glassfish v3.0

part for Congonation

• restlet 2.0.5
• spring 3.0.5
• hibernate 3.3.2
• glassfish v3.0

client class (test only)

import java.io.IOException;

import org.restlet.Client;
import org.restlet.Request;
import org.restlet.Response;
import org.restlet.data.MediaType;
import org.restlet.data.Method;
import org.restlet.data.Protocol;
import org.restlet.ext.jaxb.JaxbRepresentation;

public class SistemGirisClientKullaniciDogrula {

    public static void main(String[] Args) throws IOException {

        String url = "http://localhost:8080/Project/sistemgirisws";

        Client client = new Client(Protocol.HTTP);

        Kullanici kullanici = new Kullanici();
        kullanici.setKodu("1");

        JaxbRepresentation<Kullanici> jaxbRepresentationSendingKullanici= new JaxbRepresentation<Kullanici>(MediaType.APPLICATION_XML, kullanici);

        Request request = new Request(Method.GET, url, jaxbRepresentationSendingKullanici);
        Response response = client.handle(request);

        JaxbRepresentation<Kullanici> kullaniciResponse = new JaxbRepresentation<Kullanici>(response.getEntity(), Kullanici.class);
        kullanici = kullaniciResponse.getObject();

        System.out.println("kullanici id : " + kullanici.getId());
    }
}

Web service

public class ProjectWebService {

/**
 * 
 * @param representation
 * @return
 */
@Get
public Representation getKullanici(Representation representation) {

    JaxbRepresentation<Kullanici> jaxbRepresentation = new JaxbRepresentation<Kullanici>(representation, Kullanici.class);

    Kullanici kullanici = new Kullanici();

    try {

        kullanici = jaxbRepresentation.getObject(); //THIS LINE THROW java.lang.classCastException tr.com.app.Kullanici cannot be cast to tr.com.app.Kullanici.

    } catch (IOException e) {
        e.printStackTrace();
    }

    try {

        kullanici = sistemGirisBusinessManager.kullaniciDogrula(kullanici);

        getResponse().setStatus(Status.SUCCESS_OK);
        return new JaxbRepresentation<Kullanici>(MediaType.APPLICATION_XML, kullanici);

    } catch (Exception exception) {

        exception.printStackTrace();
        getResponse().setStatus(Status.CLIENT_ERROR_EXPECTATION_FAILED);
        return new JaxbRepresentation<MesajList>(MediaType.APPLICATION_XML, sistemGirisBusinessManager.getMesajList());

    }
}
}

Does anyone know what the problem is?