Forget about ClassC, you could use any other field there, since that value will be stored in a secondary table based on the inheritance type defined in the example. But regarding ClassType here is the mapping.

@Audited
@Entity(name = "ClassType")
@Table(name = "ClassType")
public class ClassType{
    @Id
    @Column(name = "Name")
    private String type;

...
}

Hope this helps.