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From Romain Manni-Bucau <rmannibu...@gmail.com>
Subject Re: EntityManager into controller viewscoped
Date Sun, 12 Feb 2017 20:45:45 GMT
This generally traduces a design error but extended persistence contexts fit

Le 12 févr. 2017 21:33, "mauro2java2011" <mauro2java2011@gmail.com> a
écrit :

> I would use the injected em for resolve the problem of  lazy loading of
> entity child.
> for example to get the Orders collection from a Customer entity where the
> relatioship into Customer entity is
> BIDIRECTIONAL
>
> @OneToMany
> (mappedby customer)
> Set <Order> orderslist
>
> I would use the
>
> Open Session In View pattern
> Like explained into
>
> http://stackoverflow.com/questions/1847040/open-session-in-view-pattern
>
> so into CustomerController when i select a Customer from table i merge it
> with em injected and i  can get the Orderslist with the getOrdersList from
> selectedCustomer  and iterate for get each order.
> With requestscoped em i can use the open session in view pattern like
> hibernate.
>
>
>
> Il 12/feb/2017 15:22, "Romain Manni-Bucau [via TomEE & OpenEJB]" <
> ml-node+s979440n4681055h80@n4.nabble.com> ha scritto:
>
> > Hi
> >
> > 2017-02-12 14:38 GMT+01:00 mauro2java2011 <[hidden email]
> > <http:///user/SendEmail.jtp?type=node&node=4681055&i=0>>:
> >
> > > Hi all.
> > >
> > > I would use a requestscoped entitymanager into a viewaccesscoped
> > > controller.
> > >
> > > So i ask:
> > >
> > > The injected em requestscoped into controller viewscoped is a new em
> for
> > > each request or  is all times the same into viewscoped  controller?
> > >
> > > I know that the entity manager is not serializable.
> > >
> > > It is but it is not reliable in most cases
> >
> >
> > > So if the em is  requestscoped i resolve the problem with tge
> > serialization
> > > of the em into viewaccesscoped cobtroller?
> > >
> > > I have to configure some thing for use jta into cdi injected em ?
> > >
> > > Jta scope = transaction so not sure it matches
> >
> >
> > > Into the class where i declare the method productor i have to use the
> > >
> > > @PersistenceContext (unitNane="namePU")
> > > private EntityManager em;
> > >
> > > @Produces
> > > @RequestScoped
> > >
> > > public EntityManager getEntityManager (){
> > > return this.em;
> > >
> > > }
> > >
> > > Or i have to use the EntityManagerFactory with
> > >
> > > @PersistenceUnit (name="namePu")
> > >
> > > private EntityManagerFactory emf;
> > >
> > > public getEntityManager (){
> > > return emf.createEntityManager;
> > >
> > > }
> > >
> > > public void closeEm (@Disposes EntityManager em){
> > >
> > > em.close ();
> > >
> > > }
> > >
> > >
> > this works for resource_local EM
> >
> >
> > reading your mail it looks you just want a command pattern with a final
> > jta
> > transaction instead of immediate EM actions
> >
> >
> > > Tank you very much .
> > >
> > > Mauro
> > >
> > >
> > >
> > >
> > > --
> > > View this message in context: http://tomee-openejb.979440.
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> > > Sent from the TomEE Users mailing list archive at Nabble.com.
> > >
> >
> >
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