just as additional information, this is also true about any lazy
PersistentCollection too. I found that if I accessed the collection while
it is in an attached state the values are available, but as soon as it
becomes detached the collection becomes null even if I had just accessed
it prior to detachment.
I'm not entirely sure if this is a bug or if it's suppose to work this way
when detached.
On Wed, Apr 08, 2009 at 05:18:48PM +0200, Marc Logemann wrote:
> Hi,
>
> with OpenJPA 1.2.0 i am having some problems detaching attributes which
> are in a fetch-group. My persistence.xml is:
>
> <property name="openjpa.DetachState" value="fetch-
> groups(DetachedStateField=true)"/>
>
> My Domain class header:
>
> @FetchGroups({
> @FetchGroup(name="posDetail", attributes={
> @FetchAttribute(name="deliveryAddresses")
> })
> })
> public class Order {
>
> @OneToMany(mappedBy = "order", cascade = CascadeType.ALL, fetch =
> FetchType.LAZY)
> List<DeliveryAddress> deliveryAddresses;
> ...
> }
>
> (in fact i also have the @LoadFetchGroup("posDetail") to be sure.....)
>
> Now when i am leaving my DAO layer which means that the persistence
> contexts ends, the delivery address is "null" even though its in the
> fetch group. I even queried for the fetch group in the DAO before
> leaving it via:
>
> OpenJPAQuery oQuery = OpenJPAPersistence.cast(em.createQuery("select o
> from Order o where o.oid = ?1"));
> oQuery.setParameter(1, oid);
> //
> oQuery.getFetchPlan().setMaxFetchDepth(3).addFetchGroup("posDetail");
> List list = oQuery.getResultList();
> if(list != null && list.size() > 0) {
> return (Order)list.iterator().next();
> }
>
> I know it must be a detach issue because with the following
> persistence.xml it works (but i definitely wont use this config in
> production)
>
> <property name="openjpa.DetachState" value="all"/>
>
> Am i missing something here? When i debug my DAO, the deliveryAddress
> attribute is populated but as soon as i leave my DAO, its lost.
>
> ---
> regards
> Marc Logemann
> http://www.logemann.org
> http://www.logentis.de
>
>
>
>
--
Ted Leung
[email protected]
I can speak Canadian, American, Australian, and little English.
