[JBoss-user] [EJB 3.0] - 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() + "]";
  }
}


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