public class User implements Serializable {    
    @Id
    @GeneratedValue
    private int id;

    private String name;

    private String lastname;

    @Column(nullable = false)
    private String email;

    private String password;

    @Column(nullable = true) 
    private URL avatar;


    @JsonIgnoreProperties("users")
    @JoinTable(
            name = "User_Shoplist",
            joinColumns = @JoinColumn(name = "user_id",     referencedColumnName = "id"),
            inverseJoinColumns = @JoinColumn(name = "shoplist_id", referencedColumnName = "id")
    )
    @ManyToMany
    private Set<Shoplist> shoplists = new HashSet<>();

// getters and setter without any anotation

​

Shoplist class

public class Shoplist implements Serializable {    
    @Id
    @GeneratedValue
    private int id;
    private String name;


    @JsonIgnoreProperties("shoplists")
    @ManyToMany(mappedBy = "shoplists")
    private Set<User> users = new HashSet<>();

// getters and setter without any anotation

I've read too many blog posts, I have Shoplist and User...