why referencedColumnName element missing in Joined table startegy

[Karnati Sudhakar]

Hi All,

In EJB in Action book on page number 288 the Joined Table strategy is explained and it is implemented by the OnetoOne relationships between the Child and parent class.

Here the code given on this page

 
@Entity
@Table(name = "USERS")
@Inheritance(strategy = InheritanceType.JOINED)
@DiscriminatorColumn(name = "USER_TYPE", discriminatorType = DiscriminatorType.STRING, length = 1)
public abstract class User ...
 

@Entity
@Table(name="SELLERS")
@DiscriminatorValue(value = "S")
@PrimarykeyJoinColumn(name="USERS_ID")
public class Seller extends User {
 

I just want to know why the referencedColumnName element is missing in the @PrimarykeyJoinColumn annnotation.

Regards
Sudhakar

[Amandeep Singh]

Don't worry, even if referenceColumnName attribute is missing. It will join with the primary key's of other table's. It's a default behaviour.

[Mellon Sun]

https://coderanch.com/t/418895/java-EJB-SCBCD/certification/type-JoinColumn

It seems like referencedColumnName element can be missing in @OneToOne @JoinColumn too. What confusing me is when I point out the referencedColumnName I encounter an error because the referenced column is generated with a wrong type.