hibernate - How to autogenerate created or modified timestamp field?

Question

My entity class:

@Entity
@Table(name = "user")
public class User implements Serializable {
    private static final long serialVersionUID = 1L;

    @Id
    @SequenceGenerator(name = "USER_ID_GENERATOR", sequenceName = "USER_SEQ")
    @GeneratedValue(strategy = GenerationType.SEQUENCE, generator = "USER_ID_GENERATOR")
    @Column(name = "user_id")
    private long userId;


    @Temporal(TemporalType.DATE)
    private Date created;

    @Temporal(TemporalType.DATE)
    private Date modified;

    //setters and getters...
}

I would like to CREATED and MODIFIED fields complement each other automatically when you create or modify the object. CREATED and MODIFIED fields should be of type TIMESTAMP.

How do I achieve that?

Answer 1

In 4.3 Hibernate with JPA, one can use "@CreationTimestamp" and "@UpdateTimestamp" directly in the date fields

CreationTimestamp java doc

UpdateTimestamp java doc