How do I list roles using ENUM?

Example of a POST request that I will make to add a user: Vasya, Petrenko,910382741, vasya@mail.ru, ADMIN the first 4 attributes work, but I don't understand how to make a field for a role.

Is my database built correctly? I use Json to send a request to add a user, the user's relationship to the role is many to many. I don't understand how to send the role, I need another attribute in the user?

UserController
private UserRepository userRepository;
public UserController(UserRepository userRepository) {
this.userRepository = userRepository;
}
@PostMapping
public String userPostAdd(@RequestBody User user) {
List<Authority> rolesList = new ArrayList<>();
for (Role role : user.getRole()){
Authority r = role.getName();
if (r != null){
rolesList.add(r);
}
}
if (!rolesList.isEmpty()){
userRepository.save(user);
}
return "Add user";
}

Entity Role

@ToString
@Entity
@Table(name = "role", schema = "task")
public class Role {
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
private Long id;
@Column(name = "name", nullable = false)
@Enumerated(EnumType.STRING)
private Authority name;
@ManyToMany(fetch = FetchType.LAZY, mappedBy = "role")
private List<User> users;
getter,setter...
}

User:

@ToString
@Entity
@Table(name = "user", schema = "task")
public class User {
@Id
@GeneratedValue(strategy= GenerationType.IDENTITY)
@Column(name = "id")
private Long id;
@ManyToMany
@JoinTable(name = "user_role",
joinColumns = @JoinColumn(name = "role_id", referencedColumnName = "id"),
inverseJoinColumns = @JoinColumn(name = "user_id", referencedColumnName = "id"))
private List<Role> role;
@OneToMany(mappedBy = "user")
private Set<Contract> contract;
@Column(name = "surname", nullable = false)
private String surname;
@Column(name = "name", nullable = false)
private String name;
@Column(name = "email", nullable = false, unique = true)
private String email;
@Column(name = "phone", nullable = false, unique = true)
private Integer phone;
getter,setter...
}

Enum

public enum Authority {
TENANT ("tenant"),
LANDLORD ("landlord"),
ADMIN ("admin");
private final String name;
private Authority(String s) {
name = s;
}
public boolean equalsName(String otherName) {
return name.equals(otherName);
}
public String toString() {
return this.name;
}
}

The problem is that you're setting roles = null and then make a method call on it. You first need to fetch the role object by calling valueOf. If the role does not exist it should be null. The following should work.

@PostMapping
public String userPostAdd(@ModelAttribute User user) {
List<Roles> rolesList = new ArrayList<>();
for (Role role : user.getRole()){
Roles r = Roles.valueOf(role.getName().toUpperCase());
if (r != null){
rolesList.add(r)
} 
}
if (!rolesList.isEmpty()){
userRepository.save(user);
} 
return "Add user";
}