LazyLoading with spring and hibernate

[membersound]

Hi,
I'm trying to solve my LazyLoading problem, which I worked around by fetchType EAGER in the past. But that cannot be the final solution.

I tried to construct an example, which does not make much sence the way it is, but demonstrates my problem: I have a company, and persons are @ManyToOne by composition. The first time I launch the page everything works fine. The personCount is =0 displayed.
Now I select a company, which should result in some rerendering for Person inputs etc.
But when the code tries to access the personList by a calculator, I get this exception:

Schwerwiegend [javax.enterprise.resource.webcontainer.jsf.context] (http--127.0.0.1-8080-4) javax.el.ELException: /tableCompanies.xhtml @31,76 value=" #{calculator.getPersonCount(_var)}":
org.hibernate.LazyInitializationException: failed to lazily initialize a collection of role: business.domain.Company.personList, no session or session was closed

Maybe someone can help me solving this?

tableCompanies.xhtml:

<p:dataTable var="_var" value="#{facade.companies}">
<p:column>
<h:outputText value="#{calculator.getPersonCount(_var)}" />

backing facades:

@Named
@RequestScoped
class Facade() {
    @Inject
    Dao dao;

    List<Company> companies;

    @PostConstruct
    init() {
        companies = Dao.findByNamedQuery("Companies.ALL");
    }
}


@Named
@RequestScoped
class Calculator {
    int getPersonCount(Company c) {
        return c.getPersonList().size(); //EX
    }
}

Crud service:

@Stateless
@Transactional
class Dao() {
    @PersistenceContext
    private EntityManager em;

    //CRUD
}

Entity:

@Entity
@NamedQueries( {
    @NamedQuery(name = Company.ALL",
                query = "SELECT c FROM Company c")
})
class Company {
    @OneToMany(cascade = CascadeType.ALL)  // fetch=FetchType.EAGER <-ugly, but would work
    List<Person> personList = new LinkedList<Person>();
}

also already configured the Spring OpenEntityManager in web.xml:

<filter>
    <filter-name>OpenEntityManagerInViewFilter</filter-name>
    <filter-class>
        org.springframework.orm.jpa.support.OpenEntityManagerInViewFilter
    </filter-class>
    <init-param>
        <param-name>entityManagerFactoryBeanName</param-name>
        <param-value>entityManagerFactory</param-value>
    </init-param>
</filter>
<filter-mapping>
    <filter-name>OpenEntityManagerInViewFilter</filter-name>
    <url-pattern>/*</url-pattern>
</filter-mapping>

Nevertheless it does not work. But I have not more idea why! Maybe someone knows more?

tyvm