Violation of referential integrity constraint for delete join table entry

Question

I have a many-to-many relationship between users and groups.

@Entity
class User {
    @OneToMany(cascade = CascadeType.ALL, mappedBy = 'id.user')
    Set<GroupMembership> memberships
}

@Entity
class Group {
    @OneToMany(cascade = CascadeType.ALL, mappedBy = 'id.group')
    Set<GroupMembership> members
}

@Entity
class GroupMembership {

    @Embeddable
    static class IdKey implements Serializable {

        @ManyToOne
        @JoinColumn(name = 'userId')
        User user

        @ManyToOne
        @JoinColumn(name = 'groupId')
        Group group
    }

    @EmbeddedId
    IdKey id = new IdKey()
}

I want to delete a user or group, and any associated GroupMemberships will be deleted. However, when I try to delete a user or group, I get:

org.h2.jdbc.JdbcSQLException: Referential integrity constraint violation: "FK_96K9TDEV9PO6Q3ISOYIJPWAQU: PUBLIC.GROUP_MEMBERSHIPS FOREIGN KEY(GROUP_ID) REFERENCES PUBLIC.GROUP(ID) (1)"; SQL statement:
delete from group where id=? [23503-186]

I am using Hibernate 4.3.8 and Spring Data JPA 1.7.2.

Answer 1

Of course, despite finding the answer within a few hours, I figure it out within an hour after the publication of this question.

@OnDelete, Hibernate, , . -, @OneToMany EntityManager DDL.

@Entity
class Group {
    @OneToMany(cascade = CascadeType.ALL, mappedBy = 'id.group')
    @OnDelete(action = OnDeleteAction.CASCADE)
    Set<GroupMembership> members
}