javax.ejb.CreateException: Could not create stateless EJB

From: <glassfish_at_javadesktop.org>
Date: Sat, 23 Jan 2010 14:12:52 PST

Hi,

I am tryng 'How to Create a Java EE 6 Application with JSF 2, EJB 3.1, JPA, and NetBeans IDE 6.8' from http://netbeans.dzone.com/articles/develop-java-ee-6-app-jsf2
and when I call the EJB 3.1 I get the following exception,

A system exception occurred during an invocation on EJB CustomerSessionBean method public java.util.List com.customerapp.ejb.CustomerSessionBean.retrieve()
javax.ejb.EJBException: javax.ejb.EJBException: javax.ejb.CreateException: Could not create stateless EJB

This is the EJB declared in an EJB module,

@Stateless
@LocalBean
public class CustomerSessionBean {
    @PersistenceContext
    private EntityManager em;

    public void persist(Object object) {
        em.persist(object);
    }

    public List<Customer> retrieve() {
        Query query = em.createNamedQuery("Customer.findAll");
        return query.getResultList();
    }

    .............................................
    .............................................

}

I call the ejb from a ManagedBean in a web client. This is the code,

@ManagedBean(name = "customer")
@SessionScoped
public class CustomerMBean {

    private CustomerSessionBean customerSessionBean;
    private Customer customer;

    /** Creates a new instance of CustomerMBean */
    public CustomerMBean() {
        try {
            customerSessionBean = (CustomerSessionBean) new InitialContext().lookup("java:global/CustomerApp-web/CustomerSessionBean");
        } catch (NamingException ex) {
            Logger.getLogger(CustomerMBean.class.getName()).log(Level.SEVERE, null, ex);
        }
    }

    /**
     * Returns list of customer objects to be displayed in the data table
     * @return
     */
    public List<Customer> getCustomers()
    {
        return customerSessionBean.retrieve();
    }

    ............................................................
    ............................................................

}

What am I doing wrong?

Thanks in advance,
Jose
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