Hi all

I just tested a small example getting the code from Hibernate. here is all relevant code.

[code]session.getTransaction().begin();
Car u = new SportCar();
u.setId(1);
session.saveOrUpdate(u);
session.getTransaction().commit();[/code]

[code]@Entity
@Table (name="Car")
@Inheritance(strategy = InheritanceType.SINGLE_TABLE)
@DiscriminatorColumn(name = "discrim", discriminatorType = DiscriminatorType.STRING)
public class Car {
@Id
private Integer id;

@Column (name = "discrim", insertable = false, updatable = false)
private String discrim;
...
[/code]

[code]@Entity
@DiscriminatorValue("sport")
public class SportCar extends Car{
...[/code]

When I run it, I have exception:
[code]Exception in thread "main" org.hibernate.MappingException: Unknown entity: au.chao.bo.SportCar
at org.hibernate.impl.SessionFactoryImpl.getEntityPersister(SessionFactoryImpl.java:580)
at org.hibernate.impl.SessionImpl.getEntityPersister(SessionImpl.java:1365)
at org.hibernate.engine.ForeignKeys.isTransient(ForeignKeys.java:203)
at org.hibernate.event.def.AbstractSaveEventListener.getEntityState(AbstractSaveEventListener.java:535)
at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.performSaveOrUpdate(DefaultSaveOrUpdateEventListener.java:103)
at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.onSaveOrUpdate(DefaultSaveOrUpdateEventListener.java:93)
at org.hibernate.impl.SessionImpl.fireSaveOrUpdate(SessionImpl.java:534)
at org.hibernate.impl.SessionImpl.saveOrUpdate(SessionImpl.java:526)
at org.hibernate.impl.SessionImpl.saveOrUpdate(SessionImpl.java:522)
at au.chao.TestMain.main(TestMain.java:18)
[/code]

No idea why this happens, google for a while. can not find answer.

Anybody here can help?

Thanks
Steve

Sorry guys, figure out myself.

Forgot update the mapping file :).