I'm using maven multimodule project. I divided my logic into different layers, Presentation, Business logic, data layer, each one in a separate module(layer). When I try to insert an object, this exception occurs:
org.hibernate.MappingException: Unknown entity: com.xxxxx.service.model.Object$Proxy$_$$_WeldClientProxy
How is this caused and how can I solve it?
I'm using CDI bean and the application is based on JSF2 and Hibernate.
This problem will happen when you have a JPA entity which is also declared as a CDI managed bean like below:
@Named // Or @XxxScoped
@Entity
public class YourEntity {}
And you attempt to persist the CDI managed bean instance itself like below:
@Inject
private YourEntity yourCDIManagedEntity;
@PersistenceContext
private EntityManager entityManager;
public void save() {
entityManager.persist(yourCDIManagedEntity);
}
This is not the correct way. You should not make your entity a CDI managed bean. A CDI managed bean is actually a proxy class. You can clearly see this back in your exception message. It says it doesn't know the entity com.xxxxx.service.model.Object$Proxy$_$$_WeldClientProxy instead of that it doesn't know the entity com.xxxxx.service.model.Object.
@Entity // NO @Named nor @XxxScoped!
public class YourEntity {}
And you should prepare it as a normal entity instance and then you can safely persist it as a normal entity.
private YourEntity yourNormalEntity;
@PersistenceContext
private EntityManager entityManager;
@PostConstruct
public void init() {
yourNormalEntity = new YourEntity();
}
public void save() {
entityManager.persist(yourNormalEntity);
}
