Internationalization in vaadin 8

Vaadin 6 / 7 / 8
1

I am using Vaadin 8, java EE7 and Wildfly.

Can you please give me some advice for internationalization.

What is here “best practice”.

I try to make it like the example in https://github.com/peholmst/VerySimpleI18N

How must i change the methode updateMessageStrings(), that it works with vaadin 8

package org.vaadin.webinar.i18n;

import java.util.Locale;

import com.vaadin.ui.ComboBox;

public class LanguageSelector extends ComboBox implements Translatable {

    private static final Locale SWEDISH = new Locale("sv");
    private static final Locale FINNISH = new Locale("fi");

    public LanguageSelector() {
        addItem(Locale.ENGLISH);
        addItem(FINNISH);
        addItem(SWEDISH);
        setValue(Locale.ENGLISH);
        setNullSelectionAllowed(false);
        addValueChangeListener(e -> getUI().setLocale((Locale) getValue()));
    }

    @Override
    public void updateMessageStrings() {
        Messages messages = Messages.getInstance();
        setValue(getLocale());
        setItemCaption(Locale.ENGLISH, messages.getMessage("languageSelector.en"));
        setItemCaption(SWEDISH, messages.getMessage("languageSelector.sv"));
        setItemCaption(FINNISH, messages.getMessage("languageSelector.fi"));
    }
}
2

I use in every custom component this, from accept-header in browser but I use spring messagges, after switch everything is translated:

private ResourceBundle bundle;
private Locale browserLocale;

@Override
protected void init(VaadinRequest request) {

	browserLocale = VaadinService.getCurrentRequest().getLocale(); // from accept-header
	bundle = ResourceBundle.getBundle("messages", browserLocale);
	setLocale(browserLocale);
		
	}
	.
	.
	.
	
grid.addColumn(Person::getName).setCaption(bundle.getString("label.name"));
3

Hmmm
is it possible to make it without spring.
I want to make it like in the vaadin-example https://github.com/peholmst/VerySimpleI18N
but it doesn’t work with vaadin 8

@SuppressWarnings("serial")
@Theme("appui")
@CDIUI("")
public class MainUI extends UI {
	@Inject
	CDIViewProvider viewProvider;

	@Inject
	LoginView loginView;

	private Navigator navigator;


	@Override
	protected void init(VaadinRequest request) {
	...
	}


	@Override
	public void setLocale(Locale locale) {
		super.setLocale(locale);
		updateMessageStrings(getContent());
	}

	private void updateMessageStrings(Component component) {
		if (component instanceof Translatable) {
			((Translatable) component).updateMessageStrings();
		}
		if (component instanceof HasComponents) {
			((HasComponents) component).iterator().forEachRemaining(this::updateMessageStrings);
		}
	}

}

@SuppressWarnings("serial")
@UIScoped
public class LoginView extends VerticalLayout implements View, Translatable {


    private String welcomeMessageCaption = "Welcome, please Login - Test";

	public LoginView() {
		welcomeMessage = new Label(welcomeMessageCaption);
		...
		
		addComponent(welcomeMessage);
		addComponent(languageSelector);
	}

	@Override
	public void updateMessageStrings() {
		final Messages messages = Messages.getInstance();
		welcomeMessage.setCaption(messages.getMessage("auth.welcomemessage"));
		languageSelector.setCaption(messages.getMessage("languageSelector.caption"));
	}
}

public class LanguageSelector extends ComboBox<Locale> implements Translatable {

	private static final long serialVersionUID = 1L;

	private static final Locale SWEDISH = new Locale("sv");
	private static final Locale FINNISH = new Locale("fi");

	public LanguageSelector() {
		setItems(getLanguageList());
		setValue(Locale.ENGLISH);
		setEmptySelectionAllowed(false);

		addValueChangeListener(e -> {
			getUI().setLocale((Locale) getValue());
		});
	}

	@Override
	public void updateMessageStrings() {
		setValue(getLocale());
		setItemCaptionGenerator(Locale::getLanguage);
		setItems(getLanguageList());
	}

	private List<Locale> getLanguageList() {
		List<Locale> languageList = new ArrayList<>();
		languageList.add(Locale.ENGLISH);
		languageList.add(Locale.GERMAN);
		languageList.add(SWEDISH);
		languageList.add(FINNISH);
		return languageList;
	}
}
4

I have solved the problem

5

Hi hans, could you please explain how you solved?