I am trying to use ModelMapper to map a collection of Role Entity into a list of the names of the roles that the user have.

I tried a lot of things but nothing is working properly.

public class User {
    private int id;
    private String name;
    private Set<Role> roles;
}

public class Role {
    private int id;
    private String name;
    private boolean admin;
}

public class UserDto {
    private int id;
    private String name;
    private Set<String> rolenames;
}

An extra question : Is the modelmapper a good choice for this use case ?

Thanks !