Hibernate

Bi-Directional Many to Many using Hibernate managed join table

June 11, 2022 by aAshish

@Entity
@Table(name = "FOO")
public class Foo {
  private UUID fooId;

  @OneToMany
  @JoinTable(
      name = "FOO_BAR",
      joinColumns = @JoinColumn(name = "fooId"),
      inverseJoinColumns = @JoinColumn(name = "barId"))
  private List<Bar> bars;
}

@Entity
@Table(name = "BAR")
public class Bar {
  private UUID barId;

  @OneToMany
  @JoinTable(
      name = "FOO_BAR",
      joinColumns = @JoinColumn(name = "barId"),
      inverseJoinColumns = @JoinColumn(name = "fooId"))
  private List<Foo> foos;
}

Specifies a relationship between many Foo objects to many Bar objects using an intermediate join table that Hibernate manages.

The Foo objects are stored as rows in a table called FOO. The Bar objects are stored as rows in a table called BAR. The relationships between Foo and Bar objects are stored in a table called FOO_BAR. However this implies that there is no FooBar object as part of the application.