Re: [eclipselink-users] @PostLoad not called on a ReadAllQuery?

[James Sutherland <jamesssss@xxxxxxxxx>]

Instead of,
>> Session session = JpaHelper.getServerSession(emf);

Use,
Session session = ((JpaEntityManager)em.getDelegate()).getActiveSession();

This will be the UnitOfWork in the same persistence context as the
EntityManager.



DeSilentio wrote:
> 
> Thanks for the explanation. I think you might be right about the Cache. I
> couldn't really test this before because I was having other difficulties
> on redeployment (per another post). Is there a way to force it to reload
> from outside the cache? I guess you seem to be suggesting that using a
> UnitOfWork will do this, but is it possible to return a ScrollableCursor
> using a UnitOfWork? If so could you provide a simple example of how to do
> so?
> 
> Here is my query code (class names obscured):
> 
> Session session = JpaHelper.getServerSession(emf);
> ReadAllQuery query = new ReadAllQuery(ClassA.class);
> ExpressionBuilder builder = query.getExpressionBuilder();
> 
> // I was using a scrollable cursor but have recently stopped
> // query.useScrollableCursor(pageSize)
> 
> query.setSelectionCriteria(expression);
> query.addOrdering(orderingExpression);
> 
> result = (Vector) session.executeQuery(query);
> // or
> // cursor = (ScrollableCursor) session.executeQuery(query);
> 
> 
> 
> James Sutherland wrote:
>> 
>> In EclipseLink the JPA postLoad event is translated into the native
>> EclipseLink events.  Currently it sets the EclipseLink events, postBuild
>> (called when a new object is built from the database), postRefresh
>> (called when an existing object is refreshed from the database),
>> postClone (called whenever EclipseLink clones an object, such as
>> registering an object from the shared cache into the EntityManager
>> persistence context, but also when merging back into the shared cache,
>> and when copying a new object or merged object).  So the postLoad on
>> persist/merge is caused by the postClone, which is odd, you may wish to
>> log a bug for this as calling postLoad here does not seem correct.
>> 
>> As for why postLoad is not called on your ReadAllQuery, I'm not sure. 
>> Can you include the code on how you execute the query.  Is the postLoad
>> called when executing JPA queries?
>> 
>> My guess is that the object is already in the shared cache, so when you
>> execute the query, you get the existing object from the shared cache, so
>> it is not loaded from the database, so no event.  Your query is probably
>> somehow read-only or using the ServerSession, so the object is not
>> cloned.  If you used a UnitOfWork, it would be cloned causing the event.
>> 
>> 
>> 
>> DeSilentio wrote:
>>> 
>>> Also...
>>> 
>>> I am using an non container managed persistent unit although using it
>>> with glassfish.
>>> I believe I am using eclipselink 1.0.2.
>>> 
>>> Strangely it looks like the method marked as @PostLoad is being called
>>> when I persist/merge an object of this type.
>>> 
>>> 
>>> DeSilentio wrote:
>>>> 
>>>> Hi,
>>>> 
>>>> I'm performing a ReadAllQuery to retrieve a ScrollableCursor. I have a
>>>> method of the class I'm trying to retrieve that is annotated as
>>>> @PostLoad. However, this method does not appear to be called when I use
>>>> the ReadAllQuery. What is the appropriate way to make sure this method
>>>> is called after the query is performed?
>>>> 
>>>> Any help appreciated.
>>>> 
>>> 
>>> 
>> 
>> 
> 
> 


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http://wiki.eclipse.org/User:James.sutherland.oracle.com James Sutherland 
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