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Re: [eclipselink-users] Internal ClassCastException in 2.1: @OrderBy not respecting user collection type
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Re-reading your message, I see you understand that :) I do think this
error is good, rather than a developer thinking their hashset will be
ordered, throwing an exception seems sane.
./tch
On Tue, Aug 31, 2010 at 6:57 AM, Tim Hollosy <hollosyt@xxxxxxxxx> wrote:
> It doesn't make sense to have an ordered HashSet. If you want
> something to be ordered, it has to be a List. Eclipselink can't order
> your HashSet.
>
> ./tch
>
>
>
> On Mon, Aug 30, 2010 at 3:27 PM, Laird Nelson <ljnelson@xxxxxxxxx> wrote:
>> I have an entity with a @OneToMany field. It's mapped like this:
>>
>> @OneToMany(cascade = { CascadeType.PERSIST, CascadeType.REMOVE },
>> mappedBy = "foo", targetEntity = BarEntity.class)
>> @OrderBy
>> private Collection<Bar> stuff;
>>
>> I discovered that if I initialize this myself like this in, say, the
>> constructor:
>>
>> this.stuff = new LinkedHashSet<Bar>();
>>
>> ...I get a class cast exception during persist that says:
>>
>> java.lang.ClassCastException: java.util.LinkedHashSet cannot be cast
>> to java.util.List
>> at org.eclipse.persistence.internal.queries.OrderedListContainerPolicy.iteratorFor(OrderedListContainerPolicy.java:429)
>> at org.eclipse.persistence.mappings.CollectionMapping.cascadeRegisterNewIfRequired(CollectionMapping.java:369)
>> at org.eclipse.persistence.internal.descriptors.ObjectBuilder.cascadeRegisterNewForCreate(ObjectBuilder.java:1684)
>> at org.eclipse.persistence.internal.sessions.UnitOfWorkImpl.registerNewObjectForPersist(UnitOfWorkImpl.java:4212)
>> at org.eclipse.persistence.internal.jpa.EntityManagerImpl.persist(EntityManagerImpl.java:384)
>>
>> Is there some section of the JPA 2.0 specification that says what
>> collection types are permitted? Or that the kind of Collection
>> annotated by @OrderBy must be a List? Is this pilot error or a bug?
>>
>> Thanks,
>> Laird
>> _______________________________________________
>> eclipselink-users mailing list
>> eclipselink-users@xxxxxxxxxxx
>> https://dev.eclipse.org/mailman/listinfo/eclipselink-users
>>
>
