hql error using in clause with Session instead of EntityMana

[baspet]

Hi,

i have a strange exception executing code below:

@PersistenceContext EntityManager em;
...

Session session = (Session) em.getDelegate();
List<Integer> aList = new ArrayList<Integer>();
aList.add(1);
aList.add(2);
List results = session.createQuery("from MyTable where myField in (:ids)").setParameter("ids", aList).list();

executing above query results in ClassCastException at IntegerType class.
But, if i use em instead of session, query executed successfully!

List results = em.createQuery("from MyTable where myField in (:ids)").setParameter("ids", aList).getResultList();

I'm not sure if this is a seam bug but any help would be welcomed.

Thanks,
V.