Hi, I'm new with Hibernate 3 and I have a problem.

I've an abstract class with other two subclasses who depends form this abstract class. I'm using annotations to relation with the database. Here I put the code:

Abstract class:

@Entity
@Inheritance(strategy=InheritanceType. SINGLE_TABLE)
@Table(name="t_use_case")
@DiscriminatorColumn(name="TYPE",discriminatorType=DiscriminatorType. STRING,length=2)
public abstract class UseCase {...}

Subclasses:

@Entity
@DiscriminatorColumn(name="TYPE")
@DiscriminatorValue("AN")
public class AnalysisUseCase extends UseCase{...}

@Entity
@DiscriminatorColumn(name="TYPE")
@DiscriminatorValue("SU")
public class SubfunctionUseCase extends UseCase{...}

When I want instantiate the class UseCase i have this error:

cause: org.springframework.orm. Hibernate3. HibernateSystemException: Cannot instantiate abstract class or interface: com.zentipede.up. Model. UseCase; nested exception is org.hibernate.InstantiationException: Cannot instantiate abstract class or interface: com.zentipede.up. Model. UseCase

I think that it can be that the entities it is wrong (I don't think so) or something with proxy's).

Someone can help me about that?

Thanks a lot.