SelectOneListbox

@Named
@RequestScoped
public class SelectOneView {
    
    private String option;   
    private Country country;
    private List<Country> countries;
    
    @Inject
    private CountryService service;
    
    @PostConstruct
    public void init() {
        countries = service.getCountries();
    }

    public String getOption() {
        return option;
    }

    public void setOption(String option) {
        this.option = option;
    }

    public Country getCountry() {
        return country;
    }

    public void setCountry(Country country) {
        this.country = country;
    }

    public List<Country> getCountries() {
        return countries;
    }

    public void setCountries(List<Country> countries) {
        this.countries = countries;
    }

    public void setService(CountryService service) {
        this.service = service;
    }
}

public class Country {

    private int id;
    private String name;
    private String code;

    public Country() {}

    public Country(int id, String name, String code) {
        this.id = id;
        this.name = name;
        this.code = code;
    }

    public int getId() {
        return id;
    }

    public void setId(int id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getCode() {
        return code;
    }

    public void setCode(String code) {
        this.code = code;
    }

    @Override
    public boolean equals(Object o) {
        if (this == o) return true;
        if (o == null || getClass() != o.getClass()) return false;
        Country country = (Country) o;
        return id == country.id &&
                Objects.equals(name, country.name) &&
                Objects.equals(code, country.code);
    }

    @Override
    public int hashCode() {
        return Objects.hash(id, name, code);
    }

    @Override
    public String toString() {
        return name;
    }

}

@Named
@ApplicationScoped
public class CountryService {

    private List<Country> countries;

    @PostConstruct
    public void init() {
        countries = new ArrayList<>();

        String[] locales = Locale.getISOCountries();

        for (int i = 0; i < locales.length; i++) {
            Locale country = new Locale("", locales[i]);
            countries.add(new Country(i, country.getDisplayCountry(), country.getCountry().toLowerCase()));
        }
        
        Collections.sort(countries, (Country c1, Country c2) -> c1.getName().compareTo(c2.getName()));
    }

    public List<Country> getCountries() {
        return new ArrayList<>(countries);
    }
}