Property versus Field based Persistence

[Akhil Maharaj]

All ,


Reference : EJB3.0 in action (Manning)

I am trying to understand the follwoing line

Annotations used with a setter method are ignored by the persistence provider for property-based access.

Any ideas ?

I under stand that the foolowing code also from the same book is Property based persistence

  
@Entity
public class Category {
    @Id
    public Long id;
 
    public String name;
    public Date modificationDate;
 
    public Category() {}
}

[Sergio Tridente]

Originally posted by Akhil Maharaj:

I am trying to understand the follwoing line

� Annotations used with a setter method are ignored by the persistence provider for property-based access. �

Annotations should be applied to the getter methods when using property-based access. If you apply an annotation to a setter method, the annotation is ignored by the persistence provider.

Originally posted by Akhil Maharaj:

I understand that the foolowing code also from the same book is Property based persistence

  
@Entity
public class Category {
    @Id
    public Long id;
 
    public String name;
    public Date modificationDate;
 
    public Category() {}
}

Your code is using field-based access. Note that the @Id annotation (the only required annotation) is used on a field and not on a getter method of a property.
[ October 08, 2008: Message edited by: Sergio Tridente ]

[Karnati Sudhakar]

Akhil,

I think Sergio cleared your doubt. I was in same confusion when i started that chapter but if you just turn few pages you will understand that concept.
if you still have doubt do post here i will try to clear.

Regards,
Sudhakar