java - @ManyToMany 编译问题

Question

我已经处理我的用户 - 角色 - 映射问题很长一段时间了，但我目前陷入这个问题:
调用 init 方法失败；嵌套异常是 org.hibernate.AnnotationException:使用 @OneToMany 或 @ManyToMany 定位未映射的类:

用户

    @ManyToMany(fetch = FetchType.EAGER)
    @JoinTable(name = "users_roles", joinColumns = @JoinColumn(name = "user_id", referencedColumnName = "id"), inverseJoinColumns = @JoinColumn(name = "role_id", referencedColumnName = "id"))
    private Collection<Role> roles;

角色

    @ManyToMany(mappedBy = "roles")
    private Collection<User> users;

    @ManyToMany
    @JoinTable(name = "roles_privileges", joinColumns = @JoinColumn(name = "role_id", referencedColumnName = "id"), inverseJoinColumns = @JoinColumn(name = "privilege_id", referencedColumnName = "id"))
    private Collection<Privilege> privileges;

特权

    @ManyToMany(mappedBy = "privileges")
    private Collection<Role> roles;

我认为问题出在映射结构中的关系之间。非常感谢任何建议。

Answer 1

您应该在所有“@ManyToMany”注释中使用“mappedBy”属性。

用户

@ManyToMany(fetch = FetchType.EAGER, mappedBy = "users")
@JoinTable(name = "users_roles", joinColumns = @JoinColumn(name = "user_id", referencedColumnName = "id"), inverseJoinColumns = @JoinColumn(name = "role_id", referencedColumnName = "id"))
private Collection<Role> roles;

角色

@ManyToMany(mappedBy = "roles")
private Collection<User> users;

@ManyToMany(mappedBy = "roles")
@JoinTable(name = "roles_privileges", joinColumns = @JoinColumn(name = "role_id", referencedColumnName = "id"), inverseJoinColumns = @JoinColumn(name = "privilege_id", referencedColumnName = "id"))
private Collection<Privilege> privileges;