I have a Person class which extends Persistent. Version field is defined inside Persistent class. When I save/update a person object in this setup the version field is not being used at all. If I move the version field to Person class, then it seems to work.

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public abstract class Persistent implements Serializable {
@Column(name="version")
@Version
private int version;

public void setVersion(int version) { this.version = version;}
public int getVersion() { return this.version; }
}

@Entity
@Table(name="person")
@SequenceGenerator(name="person_id_seq", sequenceName="na_generic_id_seq")
public class Person extends Persistent {
@Id
@GeneratedValue(strategy=GenerationType.AUTO, generator="person_id_seq")
@Column (name = "person_id")
private Long id;

@Column(name="name")
private String name;

// Getters and setters
}

TestCase:

Person person = new Person();
person.setName("Joe");
savedPerson = personDAO.save(person); // Version column in the db defaulted to 0

savedPerson.setName("Bill");
personDAO.save(savedPerson); // I would have expected version column to be updated to 1

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Am I doing something wrong? Should the Id field and the Version field be defined in the same class? If so, why?

Thanks
Ravinder

You need to annotate Persistent with @MappedSuperclass.