Question

Assuming a JPA entity with (for example) an long id generated automatically:

@Entity
@AutoProperty
public class SomeItem {

    @Id
    @GeneratedValue(strategy=GenerationType.AUTO)   
    private long Id;

    ...

}

Is there any reason to not generate setter and getters for this Id? One might be tempted to not generate a setter for example, since it is the responsibility of JPA to generate the ID.

Answer 1

You may find that you may be able to get away without putting a getter/setter on the JPA Entity from the persistence side of things. But if you start dealing with entities that are serialized from other sources, even from your view in some cases, you will need a way to set the ID of the entity to let JPA know that it is dealing with an existing entity, if you cant set the id, then the persistence layer will just treat it as a new Object.