IllegalProductException: return type must be Serializable for Hibernate SessionImpl???

[DonatasCiuksys]

Hi,

I'm using TomEE 7.0.3 WebProfile (thus latest OpenWebBeans) with Hibernate
5.2.9. I'm trying to write CDI producer for ViewScoped EntityManager: 

    @PersistenceUnit
    private EntityManagerFactory emf;

    @Produces
    @ViewScoped
    private EntityManager createJTAViewScopedEntityManager() {
        return emf.createEntityManager(SynchronizationType.SYNCHRONIZED));
    }

Yet at the injection point I'm getting exception:
javax.el.ELException: javax.enterprise.inject.IllegalProductException:
WebBeans producer : createJTAViewScopedEntityManager return type in the
component implementation class : lt.vu.usecases.cdi.JPAResources with
passivating scope @javax.faces.view.ViewScoped must be Serializable

I don't understand the reason for this exception, because Hibernate returns
instance of class "SessionImpl" (as can be seen with debugger), and this
class *implements Serializable*. What is the problem?



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