We have seen multiple cases of users migrating from Hibernate 5 to 6 getting errors caused by having an invalid mapping: entity collections annotated with a {{mappedBy}} which references a property of a different type of the original entity. For example:
{code:java} @Entity
public static class EntityA {
@Id
private Long id;
@OneToMany( mappedBy = "three" )
private List<EntityB> twos;
}
@Entity
public static class EntityB {
@Id
private Long id;
@ManyToOne
private EntityC three;
}
@Entity
public static class EntityC {
@Id
private Long id;
}{code}
This type of mappings used to work in Hibernate 5 (with unexpected results), but in 6 it causes errors.
We should check the {{mappedBy}} property type ahead of time and give a give a more informative error message. |
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