I defined a class
public class UsergroupList extends ArrayList<Usergroup>
| {}
|
The class user is
public class User implements Serializable
| { ...
| private UsergroupList mUsergroupList;
|
| @ManyToMany ( targetEntity = Usergroup.class )
| public Collection getUsergroupList()
| { return mUsergroupList; }
when deploying I get the error
org.hibernate.AnnotationException: Illegal attempt to map a non collection as a
@OneToMany, @ManyToMany or @CollectionOfElements: com.xyz.UsergroupList
|
but I think UsergroupList implements collection as it is an ArrayList
If I write
@ManyToMany ( targetEntity = Usergroup.class )
| public Collection getBenutzerGruppeListe()
| { return mUsergroupList; }
| the deployment works.
But invoking
private EntityManager em;
| ...
| erg = (List<User>) em.createQuery("from User").getResultList();
|
throws
javax.ejb.EJBException: javax.persistence.PersistenceException:
org.hibernate.PropertyAccessException: Exception occurred inside setter of
com.xyz.User.usergroupList
|
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