@MappedSuperclass
public abstract class AbstractBaseModel{ }
@MappedSuperclass
public class Person extends AbstractBaseModel {}
@Entity
public class APerson extends Person {}
@Entity
public class BPerson extends Person {}
@Entity< br />public class Course extends AbstractBaseModel {
@ManyToOne
@JoinColumn(name ="person")
private Person person;
}
The above structure An exception will be given:
Caused by: org.hibernate.AnnotationException: @OneToOne or @ManyToOne on
Course references an unknown entity: Person
It means that you cannot use Person in the mapping because it is not a specific entity. How can I implement such an inheritance scheme?
Use @MappedSuperclass only if you clearly don’t want the class to be queryable or part of the relationship. @Entity is everywhere.
A good heuristic decision is up to you Is the superclass abstract-if it is-use @MappedSuperclass, just like you did on AbstractBaseModel
@MappedSuperclass
public abstract class AbstractBaseModel{ }
@MappedSuperclass
public class Person extends AbstractBaseModel {}
@Entity
public class APerson extends Person {}
< br />@Entity
public class BPerson extends Person {}
@Entity
public class Course extends AbstractBaseModel {
@ManyToOne
@JoinColumn(name ="person")
private Person person;
}
The above structure will give an exception:
Caused by: org.hibernate.AnnotationException: @OneToOne or @ManyToOne on
Course references an unknown entity: Person
It means that you cannot use Person in the mapping because it is not a specific entity. How do I To implement such an inheritance scheme?
It’s very simple, you change the @MappedSuperclass annotation on Person to @Entity
Only if you clearly do not want the Use @MappedSuperclass when the class is queryable or part of a relationship. @Entity is everywhere.
A good heuristic decision is to see if your superclass is abstract-if it is-use @ MappedSuperclass, just like you do on AbstractBaseModel