Hello
I have two entity :
@Entity
public class City implements Serialiuzable
{
@Id
@GeneratedValue(strategy=GenerationType.IDENTITY)
private Key gk_key;
@Basic
private String gs_city;
@Basic
private String gs_postalCode;
...
}
I create all city for belgium (2500 entity)
My seconde entity :
@Entity
@Table(uniqueConstraints = {
@UniqueConstraint(columnNames = { "gs_idGoogle", "gs_pseudo" }) })
public class User implements Serializable
{
@Id
@GeneratedValue(strategy=GenerationType.IDENTITY)
private Key gk_key;
...
@ManyToOne
@JoinTable(name = "USER_CITY")
@JoinColumn(name = "gk_city")
private City go_city;
...
}
When I create (em.persist) or modify (em.merge) an entity User, I have this
Exception
A parent cannot be established or changed once an object has been persisted.
I use JPA
Thank you and sorry for my english
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