Vaadin App using Java Pure or Html + Java?

Flow
1

I have been a java programmer for 10 years… for the last 5 years I have been developing applications using GWT. I have been interested in Vaadin for a friend, and I would like to know which is the most common pattern to use to create professional applications in this framework.

  • Using Java Pure
  • Using Html + Java
2

The Java first approach is probably the most common, but what works best for you depends of course on what exactly you’re doing, your requirements, your skillset, and your preferences.

3

Probably a good practice is to separate the view from the java code. In fact in GWT we use the MVP pattern trying to separate them. I think it would be applicable in Vaadin, to leave all event handling and business logic in other classes (Presenter). Is there any predefined good practice in Vaadin to achieve that?

4

I’d say MVP is a solid practice with Vaadin as well, as long as you don’t overdo it.

5

//The presenter

public class Presenter {    
    public Presenter(Display display) {
        display.clickComponent().addClickListener(event -> {
            Notification.show("You Clicked a vaadin button");
        });
    }
    interface Display {
        public ClickNotifier<Button> clickComponent();
    }
}

//The view implementation

public class ViewImpl extends Div implements Presenter.Display {

    private TextField name;
    private Button acceptButton;

    public ViewImpl() {
        this.name = new TextField("Message");
        this.acceptButton = new Button();      
        add(name, acceptButton);
    }    

    @Override
    public ClickNotifier<Button> clickComponent() {
        return acceptButton;
    }
}