Override an attribute and declaring it as @Id

jazzyswami · **Joined:** Mon Jan 19, 2009 11:56 pm **Posts:** 1

Hi, I'm new to JPA/Hibernate and recently purchased "Java Persistence With Hibernate", so please bear with me.

Consider the following. My question is inline.
Thank you so much for any help!

Marcos

Code:

@MappedSuperclass
class User { 
    private String username;
    // setters/getters...
}

@Entity
class SubUser extends User {

   // How can I specify that I want the
   // inherited username to be the PK of this entity (@Id)
   // without changing the definition of User???

}

Hibernate version: 3

AKumar1 · **Joined:** Wed Nov 26, 2008 1:02 am **Posts:** 22

hi,

In subclasses, you don’t need to specify the join column if the primary key column of the subclass table has (or is supposed to have) the same name as the primary key column of the superclass table.

Hibernate will automatically do this for us.

hope this solves,