“Illegal attempt to map a non collection as a @OneToMany, @ManyToMany or @CollectionOfElements”

Question

Good morning Stackoverflow,

I have the problem that it gives me the error:

Failed to create sessionFactory object.org.hibernate.AnnotationExcept

Answer 1

Another possible reasons for this exception to occur is using a non-collection object for @ManyToMany and@OneToMany mappings Or using collection object for @ManyToOne and @OneToOne mappings. All examples below are incorrect.

INCORRECT

 @ManyToMany
 private User user;

 @ManyToOne
 private User user;

 @OneToOne
 private List users;

 @ManyToOne
 private List users;