JPA not generating “on delete set null” FK restrictions

Question

I have two related clases JPA-annotated. Alarm and Status. One Alarm can have one Status.

What I need is to be able to delete one Status and \"propagate\" a null v

Answer 1

Are you sure with your @OneToOne? It seems to me that you'd rather use @ManyToOne (as a status can be affected to several alarms):

@Entity
public class Alarm {
    ...

    @ManyToOne(cascade=CascadeType.ALL)
    @JoinColumn(name="idStatus", nullable=true)
    private Status status;

    ...
}