Spring 3.0 ORM with JPA 2.0 ClassCastException

jpa, spring

Solution

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.

Problem

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?

Original source