PAGE scope and Ajax dataTable scroll

demetrio812 Nov 15, 2007 12:38 PM

Hi,
I have a PAGE scoped bean, inside I have a list that I read from a db, in the xhtml I have a rich:dataTable and a rich:datascroller but when I scroll data I got a LazyInitializationException (could not initialize proxy - no Session).

I know that it's because the objects are detached coz of the serialization of the Bean, in fact if I use a long running conversation it works.

So my question is: there is a way to implement ajax data scrolling in a PAGE scoped bean or I have to use CONVERSATION scoped bean?

tnx

Demetrio Filocamo

1. Re: PAGE scope and Ajax dataTable scroll

pmuir Nov 15, 2007 5:11 PM (in response to demetrio812)

What type of persistence context do you use?
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2. Re: PAGE scope and Ajax dataTable scroll

demetrio812 Nov 15, 2007 5:23 PM (in response to demetrio812)
This is my bean:

@Name("myBean") @Scope(ScopeType.PAGE) public class MyBean implements Serializable { @In (create=true) EntityManager entityManager; ...

I understood that the cause is because the short session of the entityManager session but as it is a seam component (and not an EJB), how can I extend the persistence context?

Is there some way as for long-running conversations?

or have I to use EJB?

Thanks

Demetrio Filocamo
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3. Re: PAGE scope and Ajax dataTable scroll

pmuir Nov 16, 2007 5:01 AM (in response to demetrio812)

I think you are probably right, use a LRC is the simplest way to make this work.

I'll think about this one.
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4. Re: PAGE scope and Ajax dataTable scroll

demetrio812 Nov 16, 2007 6:15 AM (in response to demetrio812)

I used LRC and CONVERSATION scope, btw it would be good if page layout would mantain the same persistence context across ajax calls, if not it's impossible to use PAGE scope, ajax e JPA (of course EAGER fetch would work for datascrolling problem but I would like to use Lazy fetch)...

thank you!

Demetrio Filocamo
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