PickList

@Named
@RequestScoped
public class PickListView {
    
    @Inject
    private CountryService service;
    
    private DualListModel<String> cities;
    private DualListModel<Country> countries;
    
    @PostConstruct
    public void init() {
        //Cities
        List<String> citiesSource = new ArrayList<>();
        List<String> citiesTarget = new ArrayList<>();
        
        citiesSource.add("San Francisco");
        citiesSource.add("London");
        citiesSource.add("Paris");
        citiesSource.add("Istanbul");
        citiesSource.add("Berlin");
        citiesSource.add("Barcelona");
        citiesSource.add("Rome");
        
        cities = new DualListModel<>(citiesSource, citiesTarget);
        
        //Countries
        List<Country> countriesSource = service.getCountries().subList(0, 10);
        List<Country> countriesTarget = new ArrayList<>();
        
        countries = new DualListModel<>(countriesSource, countriesTarget);
        
    }

    public DualListModel<String> getCities() {
        return cities;
    }

    public void setCities(DualListModel<String> cities) {
        this.cities = cities;
    }

    public CountryService getService() {
        return service;
    }

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

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

    public void setCountries(DualListModel<Country> countries) {
        this.countries = countries;
    }
    
    public void onTransfer(TransferEvent event) {
        StringBuilder builder = new StringBuilder();
        for(Object item : event.getItems()) {
            builder.append(((Country) item).getName()).append("<br />");
        }
        
        FacesMessage msg = new FacesMessage();
        msg.setSeverity(FacesMessage.SEVERITY_INFO);
        msg.setSummary("Items Transferred");
        msg.setDetail(builder.toString());
        
        FacesContext.getCurrentInstance().addMessage(null, msg);
    }  
    
    public void onSelect(SelectEvent<Country> event) {
        FacesContext context = FacesContext.getCurrentInstance();
        context.addMessage(null, new FacesMessage(FacesMessage.SEVERITY_INFO, "Item Selected", event.getObject().getName()));
    }
    
    public void onUnselect(UnselectEvent<Country> event) {
        FacesContext context = FacesContext.getCurrentInstance();
        context.addMessage(null, new FacesMessage(FacesMessage.SEVERITY_INFO, "Item Unselected", event.getObject().getName()));
    }
    
    public void onReorder() {
        FacesContext context = FacesContext.getCurrentInstance();
        context.addMessage(null, new FacesMessage(FacesMessage.SEVERITY_INFO, "List Reordered", null));
    }
}

@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);
    }
}