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

Question

I am having some problems with Hibernate and the oneToMany mapping.

Here is my function:

        Location location = new Location();
                


        

Answer 1

Assign primary key in hibernate

Make sure that the attribute is primary key and Auto Incrementable in the database. Then map it into the data class with the annotation with @GeneratedValue annotation using IDENTITY.

@Entity
@Table(name = "client")
data class Client(
        @Id @GeneratedValue(strategy = GenerationType.IDENTITY) @Column(name = "id") private val id: Int? = null
)

GL

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