ids for this class must be manually assigned before calling save()

Question

I\'ve got some problem with hibernate @OneToMany mapping. It goes like here

@Entity
@Table(name = \"albums\")
@SequenceGenerator(name = \"ALBUMS         


        

Answer 1

First - it can't generate them because you didn't tell it how to do it. Use @GeneratedValue and choose the strategy you want.

Then - you can't have two @Id fields. If you want a composite id use @EmbeddedId or @IdClass