Hi,

I have a problem using hibernate as a JPA provider.

I have a class hierarchy consisting of one abstract class and two subclasses that extend this abstract class. I have another class that containts a Set of the abstract class so it can contain instances of the two subclasses. Whenever I try to get the Set of classes I get a Persistence exception saying Hibernate can't instantiate an abstract class when it really should create instances of the subclasses.

I know there is a way using the native hibernate mapping xml file using the property abstract = "true", but I'm using the JPA orm.xml mapping file which you can't use such property.

Any suggestions about how to solve this problem ?

Thank you.

CR

Hibernate version: hibernate-3.2

Mapping documents:

Code between sessionFactory.openSession() and session.close():

Full stack trace of any exception that occurs:

javax.persistence.PersistenceException: org.hibernate.InstantiationException: Cannot instantiate abstract class or interface: com.festina.tventas.app.dmo.Articulo
at org.hibernate.ejb.AbstractEntityManagerImpl.throwPersistenceException(AbstractEntityManagerImpl.java:630)
at org.hibernate.ejb.QueryImpl.getResultList(QueryImpl.java:75)

Name and version of the database you are using:

mysql 5.0.41

The generated SQL (show_sql=true):


Debug level Hibernate log excerpt:


Problems with Session and transaction handling?

Read this: http://hibernate.org/42.html