Re: Hibernate session in RequestFactory

I think filters were designed for this kind of  job 

Have you seen this?

http://stackoverflow.com/questions/4988397/gwt-requestfactory-how-to-use-single-entitymanager-per-request

On Sun, Mar 27, 2011 at 7:27 PM, rwiatr <rwiatr@gmail.com> wrote:

Thanks for the response Nooonika.
Unfortunately it doesn't work for me. I'm looking for a mechanism to
open a session before request is processed and close after (or
something like that).
Here's something that works, at least for now.

public class SessionRequestFactoryServlet extends
RequestFactoryServlet {
       private static final ThreadLocal<Session> perThreadSession = new
ThreadLocal<Session>();

       @Override
       protected void doPost(HttpServletRequest request,
                       HttpServletResponse response) throws IOException, ServletException
{

perThreadSession.set(HibernateUtil.getSessionFactory().openSession());
               try {
                       super.doPost(request, response);
               } finally {
                       perThreadSession.get().close();
                       perThreadSession.set(null);
               }
       }

       public static Session getPerThreadSession() {
               return perThreadSession.get();
       }
}
in the DAO object:
       @Transient

       public static List<HierarchyImpl> rootHierarchyRequest() {

               try {
                       Session session = SessionRequestFactoryServlet
                                       .getPerThreadSession();

                       List<HierarchyImpl> hList = new ArrayList<HierarchyImpl>(session
                                       .createQuery("from Hierarchy where parent is null").list());

                       return hList;
               } catch (Exception e) {
                       e.printStackTrace();
               }
               return null;
       }

And a servlet entry in web.xml
<servlet-class>app.server.requestfactory.SessionRequestFactoryServlet</
servlet-class>

RequestFactoryServet uses ThreadLocal variables so I guess it's ok.
Anyone knows a more suitable way to achieve this? I don't have any
experience with such thing and I'm afraid it can cause much more
problems in the future. Anyone has any suggestions?

On 27 Mar, 16:20, Nooonika <nooon...@gmail.com> wrote:
> Try: Hibernate.initialize(hList);
>
> On Mar 27, 11:47 am, rwiatr <rwi...@gmail.com> wrote:
>
>
>
>
>
>
>
> > Hello,
> > I have a problem with RequestFactory and Hibernate session.
> > [hibernate.LazyInitializationException] - failed to lazily initialize
> > a collection of role: app.server.dao.HierarchyImpl.children, no
> > session or session was closed
>
> >         @OneToMany(cascade = CascadeType.ALL)
> >         @JoinTable(name = "HIERARCHY_RELATE", joinColumns =
> > { @JoinColumn(name = "parent_id") }, inverseJoinColumns =
> > { @JoinColumn(name = "child_id") })
> >         public Set<HierarchyImpl> getChildren() {
> >                 return children;
> >         }
>
> >         public static List<HierarchyImpl> rootHierarchyRequest() {
> >                 int i = 0;
> >                 try {
> >                         SessionFactory sessionFactory = HibernateUtil.getSessionFactory();
> >                         Session session = sessionFactory.openSession();
> >                         List<HierarchyImpl> hList = new ArrayList<HierarchyImpl>(session
> >                                         .createQuery("from Hierarchy where parent is null").list());
> >                         session.close();
> >                         return hList;
> >                 } catch (Exception e) {
> >                         e.printStackTrace();
> >                 }
> >                 return null;
> >         }
> > Adding FetchType.EAGER helps but in long terms will not solve my
> > problem.
> > Is there a good way to manage Hibernate session by RequestFactory?

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