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From Rick Curtis <curti...@gmail.com>
Subject Re: NullpointerException when accessing a lazy association after merging the object without a fetch of the lazy entities
Date Thu, 04 Aug 2011 14:00:21 GMT
I don't see any issues. Is it possible that you have a TestEntity in your DB
that doesn't have any children (bad data) in your DB from a previous run?

Also, why are you calling em.merge(..)? That call is unnecessary as the
results from your query already are a part of your persistence context.

Thanks,
Rick

On Thu, Aug 4, 2011 at 7:51 AM, Michael Pflueger <Michael.Pflueger@sma.de>wrote:

> Hi,
>
> I'm digging through some of my OpenJPA problems and came across this issue.
> I get a NPE when I access te2.getChildren().xyz(), but only when I merge
> the object before the access AND the lazy association is not yet fetched AND
> I set Cascadetype.MERGE on the association.
>
>                List<TestEntity> entities = query.getResultList();
>                for (TestEntity te : entities) {
>                        TestEntity te2 = em.merge(te);
>                        System.out.println(te2.getChildren().size());
>                }
>
> I'm using OpenJPA 2.1.0 with the MySQL connector.
> Attached is the full source and persistence.xml.
>
> Can anybody reproduce this and is this a bug?
>
> Regards,
> Michael
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-- 
*Rick Curtis*

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