java.lang.ClassCastException

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  • see: http://stackoverflow.com/questions/2101500/spring-3-0-orm-with-jpa-2-0-classcastexception/2102328#2102328 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(); } } 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)); ... } Good catch. Spring is checking to see if the query is an instance of Query, and generates the proxy of that type. Unfortunately, TypedQuery is a subtype of Query, and the generated proxy will still only implement Query. TypedQuery was introduced in JavaEE 6, so it's understandable why Spring doesn't handle it, although Spring 3 is supposed to handle JavaEE 6 properly. Definitely a bug.
    via by Ke CAI,
  • see: http://stackoverflow.com/questions/2101500/spring-3-0-orm-with-jpa-2-0-classcastexception/2102328#2102328 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(); } } 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)); ... } Good catch. Spring is checking to see if the query is an instance of Query, and generates the proxy of that type. Unfortunately, TypedQuery is a subtype of Query, and the generated proxy will still only implement Query. TypedQuery was introduced in JavaEE 6, so it's understandable why Spring doesn't handle it, although Spring 3 is supposed to handle JavaEE 6 properly. Definitely a bug.
    via by Ke CAI,
    • java.lang.ClassCastException: $Proxy111 cannot be cast to javax.persistence.TypedQuery at $Proxy107.createQuery(Unknown Source)
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