Inheritance with EJB3 Entity

[omichalet]

Hello,
I just wanted to introduce a superclass for all entities in my app. The goal was to define several common behaviour like creation and modification dates. The problem is that if I define a field timestampModification annotated with @Version in the superclass annotated with @MappedSuperclass, it doesn't seem to be inherited by the subclassing entities (it is ignored and its value is still null even after inserting or updating the entity).
If I define the attribute annotated with @Version in the subclass, it works. I think there's something wrong but what ?
Thank you for your answer.



Here is the code :

________________________________________________________


package fr.cpage.fmk.core.business.entity.impl;

import java.sql.Timestamp;

import javax.persistence.Column;
import javax.persistence.MappedSuperclass;
import javax.persistence.Version;

import fr.cpage.fmk.core.business.entity.CPageObject;

@MappedSuperclass
public class CPageEntity {

private String utilisateurCreation;
private String utilisateurModification;

@Column(columnDefinition = "TIMESTAMP")
private Timestamp timestampCreation;

@Column(columnDefinition = "TIMESTAMP")
@Version
protected Timestamp timestampModification;

public String getUtilisateurCreation() {
return this.utilisateurCreation;
}

public String getUtilisateurModification() {
return this.utilisateurModification;
}

public void setUtilisateurCreation(String utilisateurCreation) {
this.utilisateurCreation = utilisateurCreation;
}

public void setUtilisateurModification(String utilisateurModification) {
this.utilisateurModification = utilisateurModification;
}

public Timestamp getTimestampCreation() {
return this.timestampCreation;
}

public Timestamp getTimestampModification() {
return this.timestampModification;
}

public void setTimestampCreation(Timestamp timestampCreation) {
this.timestampCreation = timestampCreation;
}

public void setTimestampModification(Timestamp timestampModification) {
this.timestampModification = timestampModification;
}
}

________________________________________________________




package fr.cpage.fmk.demo1.business.entity.impl;

import java.io.Serializable;
import java.sql.Timestamp;

import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;

import fr.cpage.fmk.core.business.entity.impl.CPageEntity;
import fr.cpage.fmk.demo1.business.entity.Visitor;

@Entity
public class VisitorEntity extends CPageEntity {

/**
* Le constructeur par défaut.
*
*/
protected VisitorEntity() {
// protected contructor
}

/**
* @param name le nom du visiteur
*/
public VisitorEntity(String name) {
this.name = name;
}

@Id
@GeneratedValue
private Long id;

private String name;

public Long getId() {
return this.id;
}

public void setId(Long poId) {
this.id = poId;
}

public String getName() {
return this.name;
}

public void setName(String poName) {
this.name = poName;
}

@Override
public String toString() {
return super.toString() + "[" + this.getName() + " ; " + this.getTimestampModification() + "]";
}
}

[omichalet]

This was tested with JBoss AS 4.0.4 GA patched with EJB3 RC8.

[omichalet]

Futhermore, the @Version annotation seems to work only for an attribute, not for a getter / setter...