Web services help

[dayton]

i am new to java and i need to create web services. i am trying to create WS to a maven project ( blog application creating
articles. etc) i am not sure if i am doing it right. I created a web service and a web client. when i call the service from client (simple method hello) is working but when i am trying to call articles from database i get an error.

here is the WS code:
import edu.city.set.eia.citypress.beans.ArticleFacadeLoca l;
import edu.city.set.eia.citypress.model.RegisUser;
import java.util.List;
import javax.ejb.EJB;
import javax.jws.Oneway;
import javax.jws.WebMethod;
import javax.jws.WebParam;
import javax.jws.WebService;
import javax.ejb.Stateless;


@WebService(serviceName = "Article")
@Stateless()
public class Article {
@EJB
private ArticleFacadeLocal artBean;

@WebMethod(operationName = "findByAuthor")
public @WebResult(name="byAuthor") List<Article> findByAuthor(@WebParam(name = "id") RegisUser id) {

return artBean.findByAuthor(id);
}


and the web client code:

Article_Service client = new Article_Service();
Article port = client.getArticlePort();

System.out.println(port.findByAuthor());

Thanks in advance

[Norm]

i get an error.

Please copy and paste here the full test of the error message.