Detach an entity from a JPA persistence context (JPA 2.0 / Hibernate / EJB 3 / J2EE 6)
- by Julien
Hi,
I wrote a stateless EJB method allowing to get an entity in "read-only" mode.
The way to do this is to get the entity with the EntityManager then detach it (using the JPA 2.0 EntityManager).
My code is the following:
@PersistenceContext
private EntityManager entityManager;
public T getEntity(int entityId, Class<T> specificClass, boolean readOnly) throws Exception{
try{
T entity = (T)entityManager.find(specificClass, entityId);
if (readOnly){
entityManager.detach(entity);
}
return entity;
}catch (Exception e){
logger.error("", e);
throw e;
}
}
Getting the entity works fine, but the call to the detach method returns the following error:
GRAVE: javax.ejb.EJBException
at ...
Caused by: java.lang.AbstractMethodError: org.hibernate.ejb.EntityManagerImpl.detach(Ljava/lang/Object;)V
at com.sun.enterprise.container.common.impl.EntityManagerWrapper.detach(EntityManagerWrapper.java:973)
at com.mycomp.dal.MyEJB.getEntity(MyEJB.java:37)
I can't get more information and don't understand what the problem is...
Could somebody help ?
