If you are running within servlet, container does not start any
transaction for you automatically. You need to inject/lookup a
UserTransaction object and call begin on it to start transaction
Kris Nuttycombe wrote:
> Hi, all,
>
> As you may be able to tell from the title, I'm attempting to integrate
> a bunch of pieces that are almost - but not quite - meshing smoothly.
> Here is my situation in a nutshell:
>
> I have an EJB3 entity jar that I'm attempting to use in a Lift web
> application running on Glassfish, using Hibernate as the persistence
> provider. My JNDI data source is set up from the admin console, the
> Hibernate jars have been copied into $GLASSFISH_HOME/lib, and the
> web.xml of my Lift webapp includes the appropriate
> <persistence-context-ref> elements to enable me to look up an
> EntityManager instance from the InitialContext.
>
> Lift runs within a servlet filter, and I am obtaining my EntityManager
> by calling (new
> InitialContext()).lookup("my_persistence_context_ref_name") from code
> that is ultimately called by that filter. I can successfully get the
> EntityManager and run a query that returns results. So far, so good.
>
> The problem I'm running into arises when I attempt to access a
> lazily-associated collection on an object returned from such a query.
> I'm getting the exception:
>
> Message: org.hibernate.LazyInitializationException: failed to lazily
> initialize a collection of role:
> com.gaiam.gcsi.entities.subscription.Order.subscriptions, no session
> or session was closed
> org.hibernate.collection.AbstractPersistentCollection.throwLazyInitializationException(AbstractPersistentCollection.java:358)
> org.hibernate.collection.AbstractPersistentCollection.throwLazyInitializationExceptionIfNotConnected(AbstractPersistentCollection.java:350)
> org.hibernate.collection.AbstractPersistentCollection.readSize(AbstractPersistentCollection.java:97)
> org.hibernate.collection.PersistentBag.size(PersistentBag.java:225)
>
> Looking at the logs, this seems unsurprising given that:
>
> DEBUG impl.SessionImpl - opened session at timestamp: 12209986475
> DEBUG ejb.AbstractEntityManagerImpl - Looking for a JTA transaction to join
> DEBUG ejb.AbstractEntityManagerImpl - No JTA transaction found
> DEBUG ast.QueryTranslatorImpl - parse() - HQL: FROM
> com.gaiam.gcsi.entities.subscription.Order
> ...
>
> My question is, at what point is a JTA transaction initiated such that
> my EntityManager could join it? Is this something that I need to do
> manually before I run my query? Since the persistence type of my
> persistence unit is JTA, I'm unable to use
> EntityManager.getTransaction() without it throwing an error. Is this
> something that would ordinarily be done by the container around the
> Servlet request, and the fact that Lift runs as a filter is skipping
> that setup?
>
> Many thanks,
>
> Kris
>
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