MappingException hibernate mapping columns

Question

I'm struggling with following issue:

Caused by: org.hibernate.MappingException: Foreign key (FKj4uw5b6ekvxc2djohvon7lk7:bi_person_country_countries [person_country_id])) must have same number of columns as the referenced primary key (bi_person_country [country_id,person_id])

I created 4 models:

@Table(name = "bi_country")
@Entity
public class Country {

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Integer id;

    @Column(name = "name")
    private String name;

    @ManyToMany(cascade = CascadeType.ALL)
    @JoinTable(name = "bi_person_country", joinColumns = @JoinColumn(name = "country_id"), inverseJoinColumns = @JoinColumn(name = "person_id"))
    private Set<Person> persons;

Gender:

@Table(name = "bi_gender")
@Entity
public class Gender {

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Integer id;

    @Column(name = "name")
    private String name;

    public Integer getId() {
        return id;
    }

Person:

@Table(name = "bi_person")
@Entity
public class Person {

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Integer id;

    @Column(name = "name")
    private String name;
    @Column(name = "last_name")
    private String lastName;
    @Column(name = "additional_info")
    private String additionalInfo;

    @ManyToMany(cascade = CascadeType.ALL, mappedBy = "persons")
    private Set<Country> countries;

    @ManyToOne
    private Gender gender;

PersonCountry:

@Table(name = "bi_person_country")
@Entity
public class PersonCountry {

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Integer id;

    @ManyToOne
    private Person person;

    @ManyToMany
    private List<Country> countries;

Answer 1

You dont need the PersonCountry class here as you are using @ManyToMany in both cases being Person and Country mappings.

If you have to keep it for some reason.. the linking table should not contain @OneToMany / @ManyToMany mappings, so you would have:

@ManyToOne
private Person person;

@ManyToOne
private Country country;

Keep in mind you may need to use @JoinColumn also if the database names are different than person_id and country_id .