[hibernate-issues] [Hibernate-JIRA] Commented: (EJB-199) Polymorphic association to a MappedSuperclass throws exception
[
http://opensource.atlassian.com/projects/hibernate/browse/EJB-199?page=co...
]
Don Tam commented on EJB-199:
-----------------------------
I don't think TABLE_PER_CLASS is really ideal for this considering the restrictions
(bi-directional associations only). What would be ideal, actually, is if
AssociationOverride could also override the the targetEntity attribute of the
association.
So:
@MappedSuperclass
public abstract class A {}
@Entity
public class B extends A{}
@MappedSuperclass
public abstract class C {
private A a;
@ManyToOne
public A getA() { return a; }
}
@Entity
@AssociationOverride(name="a", targetEntity=B.class)
public class D extends C {
}
Polymorphic association to a MappedSuperclass throws exception
--------------------------------------------------------------
Key: EJB-199
URL: http://opensource.atlassian.com/projects/hibernate/browse/EJB-199
Project: Hibernate Entity Manager
Issue Type: Bug
Components: EntityManager
Affects Versions: 3.2.0.cr1
Environment: Annotations CR1, EntityManager CR1, and Hibernate 3.2 CR2
Reporter: Markus Junginger
I think it should be possible to have polymorphic association to a class annotated as a
MappedSuperclass. However, this combination throws an exception.
The class Xyz is a super class for a couple of entity classes:
@MappedSuperclass
public abstract class Xyz{...}
The following association to Xyz does not work (see exception below)
@ManyToOne(fetch = FetchType.LAZY)
@JoinColumns({...})
private Xyz test;
If it matters, each entity (the sub classes of Xyz) is annotated with
@Inheritance(strategy = InheritanceType.TABLE_PER_CLASS).
Here's the execption:
javax.persistence.PersistenceException: org.hibernate.AnnotationException: @OneToOne or
@ManyToOne on play.abc.test references an unknown entity: play.Xyz
at
org.hibernate.ejb.Ejb3Configuration.createEntityManagerFactory(Ejb3Configuration.java:196)
at
org.hibernate.ejb.HibernatePersistence.createEntityManagerFactory(HibernatePersistence.java:114)
at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:37)
at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:27)
...
Caused by: org.hibernate.AnnotationException: @OneToOne or @ManyToOne on play.abc.test
references an unknown entity: play.Xyz
at org.hibernate.cfg.FkSecondPass.doSecondPass(FkSecondPass.java:40)
at
org.hibernate.cfg.AnnotationConfiguration.secondPassCompile(AnnotationConfiguration.java:261)
at org.hibernate.cfg.Configuration.buildMappings(Configuration.java:1034)
at org.hibernate.ejb.Ejb3Configuration.buildMappings(Ejb3Configuration.java:868)
at
org.hibernate.ejb.EventListenerConfigurator.configure(EventListenerConfigurator.java:163)
at
org.hibernate.ejb.Ejb3Configuration.createEntityManagerFactory(Ejb3Configuration.java:641)
at org.hibernate.ejb.Ejb3Configuration.createFactory(Ejb3Configuration.java:134)
at
org.hibernate.ejb.Ejb3Configuration.createEntityManagerFactory(Ejb3Configuration.java:188)
... 20 more
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