Minimal Springboot Vaadin

vaadin.groovy

// run with `spring run --watch vaadin.groovy`
@Grab('com.vaadin:vaadin-spring-boot-starter:1.2.0')
import com.vaadin.ui.*

@com.vaadin.spring.annotation.SpringUI
@com.vaadin.annotations.Theme("valo")
class MyUI extends UI {
        protected void init(com.vaadin.server.VaadinRequest request) {
                setContent(new Label("Hello World"))
        }
}