JPA - 다대다 관계 한계 극복

package com.toy.board.domain;

import lombok.Data;

import javax.persistence.*;
import java.util.List;

@Data
@Entity
public class Role {

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

    private String name;

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

package com.toy.board.domain;

import lombok.Data;

import javax.persistence.*;
import java.util.ArrayList;
import java.util.List;

@Data
@Entity
public class User {

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

    private String username;
    private String password;
    private Boolean enabled;

    @ManyToMany
    @JoinTable(
            name = "user_role",
            joinColumns = @JoinColumn(name = "user_id"),
            inverseJoinColumns = @JoinColumn(name = "role_id")
    )
    private List<Role> roles = new ArrayList<>();
    
}

 

 

User_Role 엔티티 생성

package com.toy.board.domain;

import lombok.Data;

import javax.persistence.*;

@Entity
@Data
public class UserRole {

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

    @ManyToOne
    @JoinColumn(name = "user_id")
    private User user;

    @ManyToOne
    @JoinColumn(name = "role_id")
    private Role role;




}