I'm trying to use JPA 2.0 in Spring 3.0 ORM. The JPA vendor is Hibernate 3.5.0-Beta-3.
It works well with JPQL, but when I tried to use CriteriaQuery, an exception happens:
java.lang.ClassCastException: $Proxy50 cannot be cast to javax.persistence.TypedQuery at $Proxy38.createQuery(Unknown Source) at com.absorbx.retailx.dao.impl.ShopDaoImpl.findByCrieria(ShopDaoImpl.java:30) at com.absorbx.retailx.dao.SimpleDaoTest.testFindByCriteria(SimpleDaoTest.java:39) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
The DAO code:
@Repository
public class ShopDaoImpl implements
ShopDao {
@PersistenceContext
transient EntityManager entityManager;
@Override
public Shop findByCrieria() {
CriteriaBuilder cb = entityManager.getCriteriaBuilder();
CriteriaQuery<Shop> c = cb.createQuery(Shop.class);
Root<Shop> shop = c.from(Shop.class);
c.select(shop).where(cb.equal(shop.get("name"), "petstore"));
TypedQuery<Shop> q = entityManager.createQuery(c);
return q.getSingleResult();
}
}
How do I solve this problem?
It seems to be a bug in Spring:
org/springframework/orm/jpa/SharedEntityManagerCreator.java
:
if (result instanceof Query) {
Query query = (Query) result;
...
result = Proxy.newProxyInstance(Query.class.getClassLoader(),
new Class[] {Query.class}, new DeferredQueryInvocationHandler(query, target));
...
}
It would be better to create an issue.
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