"[EMAIL PROTECTED]" wrote : So, Itemgroup has an items relationship that is
lazy loaded. Your findItemGroup is only loading in the Itemgroup entity
without doing any fetch joining or eagerly loading of that relationship, hence
your error.
well, but I though when I access the items-collection the first time, the data
get's loaded from the database.
anonymous wrote :
| you will need to have another method, "findItemGroupWithItems" or something
like that. In that method you execute a query that does a JOIN FETCH, rather
than use find(). Or you can do a find and then (still in
findItemGroupWithItems method) immediately force the loading to happen by
calling itemgroup.getItems().size() (this causes a second round trip to the
database - not as efficient but easy to code up).
Do I have to make the call to the size attribute within my session-bean? It
seems that it's not working as expected when I access that attribute from
within my servlet.
I read in an book, that a workaround would be to use SFSB instead of SLSB,
where the SFSB uses an extended persistent-context. This way I could make
repeated requests to my entity as long as I don't remove the SFSB.
So I tryed something like this:
| Itemgroup myItemGroup =
getItemDispatcherExtended().findItemGroup(Integer.parseInt(request.getParameter("id")));
|
| Collection<Item> myig = myItemGroup.getItems();
| getItemDispatcherExtended().finished();
|
where the ItemDispatcherExtended is a SFSB
| @Stateful
| @TransactionAttribute(TransactionAttributeType.NOT_SUPPORTED)
| public class ItemDispatcherExtendedBean implements IItemDispatcherExtended
| {
| @PersistenceContext(type = PersistenceContextType.EXTENDED) //,
unitName = "business")
| private static EntityManager em;
| //...
| }
|
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