Env: JBoss AS 4.0.5.GA w/EJB3
I have looked over several different docs that describe how to use entity
inheritance w/ SINGLE_TABLE. I used those examples as the basis for my code.
I have a base class Units and have subclasses RFUnit and EMUnit.
(em is an entitymanager object)
When I do em.find() or em.getResultList() it always returns the base class. I
get no errors of any kind. I am examining the returned class by both
returnedObject.getClass().getName() and via Eclipse debugger.
Anyone: Please advise as to how to get subclasses returned from em find or
query????
Here are the relevant class declarations:
// base class
@Entity
@Table(name = "units", catalog = "test2", uniqueConstraints =
@UniqueConstraint(columnNames = "unitName"))
@Inheritance(strategy=InheritanceType.SINGLE_TABLE)
@DiscriminatorColumn(name="hwModel",
discriminatorType=DiscriminatorType.INTEGER)
.....
// 1st subclass
@Entity
@DiscriminatorColumn(discriminatorType = DiscriminatorType.INTEGER)
@DiscriminatorValue(value="3")
public class RFUnit extends Units {
.....
// 2nd subclass
@Entity
@DiscriminatorColumn(name="hwModel", discriminatorType =
DiscriminatorType.INTEGER)
@DiscriminatorValue(value="7")
public class EMUnit extends RFUnit {
......
// code doing find/fetch
UnitsList ul = new UnitsList(); // Seam convenience class
List l = ul.getResultList();
for (Units u:l)
{
String tmp = u.getClass().getName();
System.out.println(u.getClass().getName());
}
I also tried:
ul.getEntityManager().createQuery("Select units from Units
units").getResultList(); to do the fetch. Same result.
This should be simple. What am I missing?
I did confirm the discriminator column values where as specified in the
@DiscriminatorValue annotation.
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