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Posted to users@tomee.apache.org by mauro2java2011 <ma...@gmail.com> on 2017/02/12 13:38:52 UTC
EntityManager into controller viewscoped
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.
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 ?
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 ();
}
Tank you very much .
Mauro
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Re: EntityManager into controller viewscoped
Posted by Romain Manni-Bucau <rm...@gmail.com>.
This generally traduces a design error but extended persistence contexts fit
Le 12 févr. 2017 21:33, "mauro2java2011" <ma...@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.
> > > n4.nabble.com/EntityManager-into-controller-viewscoped-tp4681054.html
> > > Sent from the TomEE Users mailing list archive at Nabble.com.
> > >
> >
> >
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> n4.nabble.com/EntityManager-into-controller-viewscoped-
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Re: EntityManager into controller viewscoped
Posted by mauro2java2011 <ma...@gmail.com>.
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.
> > n4.nabble.com/EntityManager-into-controller-viewscoped-tp4681054.html
> > Sent from the TomEE Users mailing list archive at Nabble.com.
> >
>
>
> ------------------------------
> If you reply to this email, your message will be added to the discussion
> below:
> http://tomee-openejb.979440.n4.nabble.com/EntityManager-
> into-controller-viewscoped-tp4681054p4681055.html
> To unsubscribe from EntityManager into controller viewscoped, click here
> <http://tomee-openejb.979440.n4.nabble.com/template/NamlServlet.jtp?macro=unsubscribe_by_code&node=4681054&code=bWF1cm8yamF2YTIwMTFAZ21haWwuY29tfDQ2ODEwNTR8LTExMTcxODc2MjU=>
> .
> NAML
> <http://tomee-openejb.979440.n4.nabble.com/template/NamlServlet.jtp?macro=macro_viewer&id=instant_html%21nabble%3Aemail.naml&base=nabble.naml.namespaces.BasicNamespace-nabble.view.web.template.NabbleNamespace-nabble.view.web.template.NodeNamespace&breadcrumbs=notify_subscribers%21nabble%3Aemail.naml-instant_emails%21nabble%3Aemail.naml-send_instant_email%21nabble%3Aemail.naml>
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Re: EntityManager into controller viewscoped
Posted by Romain Manni-Bucau <rm...@gmail.com>.
Hi
2017-02-12 14:38 GMT+01:00 mauro2java2011 <ma...@gmail.com>:
> 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.
> n4.nabble.com/EntityManager-into-controller-viewscoped-tp4681054.html
> Sent from the TomEE Users mailing list archive at Nabble.com.
>