如何删除实体及其链接？

Question

我正在处理两个表。我需要从数据库中删除类角色的实体，并且将其链接到“ users_roles”和“ roles_privileges”中。

@Entity
public class User {
    @Id
    @Column(unique = true, nullable = false)
    private String username;

    @ManyToMany(fetch = FetchType.EAGER)
    @JoinTable(name = "users_roles", joinColumns = @JoinColumn(name = "user_username", referencedColumnName = "username"), inverseJoinColumns = @JoinColumn(name = "role_entry", referencedColumnName = "entry"))
    public Collection<Role> roles;
}
@Entity
public class Role {

    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    private Long entry;

    private String name;
    private long project; 

    @ManyToMany(mappedBy = "roles")
    @LazyCollection(LazyCollectionOption.FALSE)
    public Collection<User> users;

    @ManyToMany(fetch = FetchType.EAGER)
    @JoinTable(
        name = "roles_privileges", 
        joinColumns = @JoinColumn(
          name = "role_entry", referencedColumnName = "entry"), 
        inverseJoinColumns = @JoinColumn(
          name = "privilege_entry", referencedColumnName = "entry"))
    private Collection<Privilege> privileges;
}

使用

roleRepository.delete(role)

我收到“无法删除或更新父行：外键约束失败”。