KeyFilter

@Named
@RequestScoped
public class AutoCompleteView {
    
    private String txt1;
    private String txt2;
    private String txt3;
    private String txt4;
    private String txt5;
    private String txt6;
    private String txt7;
    private String txt8;
    private String txt9;
    private Country country1;
    private Country country2;
    private Country country3;
    private Country country4;
    private Country country5;
    private List<Country> selectedCountries;

    @Inject
    private CountryService countryService;

    public List<String> completeText(String query) {
        String queryLowerCase = query.toLowerCase();
        List<String> countryList = new ArrayList<>();
        List<Country> countries = countryService.getCountries();
        for (Country country : countries) {
            countryList.add(country.getName());
        }

        return countryList.stream().filter(t -> t.toLowerCase().startsWith(queryLowerCase)).collect(Collectors.toList());
    }
    public List<String> noResults(String query) {
        return Collections.EMPTY_LIST;
    }

    public List<Country> completeCountry(String query) {
        String queryLowerCase = query.toLowerCase();
        List<Country> countries = countryService.getCountries();
        return countries.stream().filter(t -> t.getName().toLowerCase().contains(queryLowerCase)).collect(Collectors.toList());
    }

    public void onItemSelect(SelectEvent<String> event) {
        FacesContext.getCurrentInstance().addMessage(null, new FacesMessage("Country Selected", event.getObject()));
    }

    public void onEmptyMessageSelect() {
        FacesContext.getCurrentInstance().addMessage(null, new FacesMessage("Empty message selected"));
    }

    public String getTxt1() {
        return txt1;
    }

    public void setTxt1(String txt1) {
        this.txt1 = txt1;
    }

    public String getTxt2() {
        return txt2;
    }

    public void setTxt2(String txt2) {
        this.txt2 = txt2;
    }

    public String getTxt3() {
        return txt3;
    }

    public void setTxt3(String txt3) {
        this.txt3 = txt3;
    }

    public String getTxt4() {
        return txt4;
    }

    public void setTxt4(String txt4) {
        this.txt4 = txt4;
    }

    public String getTxt5() {
        return txt5;
    }

    public void setTxt5(String txt5) {
        this.txt5 = txt5;
    }

    public String getTxt6() {
        return txt6;
    }

    public void setTxt6(String txt6) {
        this.txt6 = txt6;
    }

    public String getTxt7() {
        return txt7;
    }

    public void setTxt7(String txt7) {
        this.txt7 = txt7;
    }

    public String getTxt8() {
        return txt8;
    }

    public void setTxt8(String txt8) {
        this.txt8 = txt8;
    }

    public String getTxt9() {
        return txt9;
    }

    public void setTxt9(String txt9) {
        this.txt9 = txt9;
    }

    public Country getCountry1() {
        return country1;
    }

    public void setCountry1(Country country1) {
        this.country1 = country1;
    }

    public Country getCountry2() {
        return country2;
    }

    public void setCountry2(Country country2) {
        this.country2 = country2;
    }

    public Country getCountry3() {
        return country3;
    }

    public void setCountry3(Country country3) {
        this.country3 = country3;
    }

    public Country getCountry4() {
        return country4;
    }

    public void setCountry4(Country country4) {
        this.country4 = country4;
    }

    public Country getCountry5() {
        return country5;
    }

    public void setCountry5(Country country5) {
        this.country5 = country5;
    }

    public List<Country> getSelectedCountries() {
        return selectedCountries;
    }

    public void setSelectedCountries(List<Country> selectedCountries) {
        this.selectedCountries = selectedCountries;
    }

    public void setCountryService(CountryService countryService) {
        this.countryService = countryService;
    }

    public char getCountryGroup(Country country) {
        return country.getName().charAt(0);
    }
}

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);
    }
}