many-to-many-relationship between two entities in spring boot

Question

I have two Entities in my Spring-Boot Application:

User.java

@Entity
public class User {
      @Id
      @GeneratedValue(strategy =          


        

Answer 1

You can find any tutorial connected with many-to-many relationship using Hibernate/Spring Data, example: Spring Data many-to-many

With your model it's simple to add the relationship mappings, like this:

@Entity
public class Role {
    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    private Long id;
    private String name;
    private String description;

    @ManyToMany(cascade = CascadeType.ALL)
    @JoinTable
    private Set<User> users;
}

and this:

@Entity
public class User {
    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    private Long id;
    private String firstname;
    private String lastname;
    private String username;
    private String password;

    @ManyToMany(mappedBy = "users")
    private Set<Role> roles;
}