Create Simple Application

Example code is available on github.com/vaadin-on-grails/spring-autowiring-basics.

In this tutorial, we will create Vaadin application where we can use @Autowired annotation.

Step 1

We need to say the plugin that we want to do annotation based URL mapping. Comment out mapping from VaadinConfig.groovy to do that.

vaadin {
//    mapping = [
//            "/*": "app.MyUI"
//    ]
}

Step 2

Now we will create a dummy service ItemService that we will autowire in Vaadin code.

package app

import grails.transaction.Transactional

@Transactional
class ItemService {

    String serviceMethod() {
        return 'Value from service'
    }
}

Step 3

Use @VaadinUI annotation to map your UI class to URL.

package app

import com.vaadin.grails.ui.VaadinUI
import com.vaadin.server.VaadinRequest
import com.vaadin.ui.Label
import com.vaadin.ui.UI
import com.vaadin.ui.VerticalLayout
import org.springframework.beans.factory.annotation.Autowired

@VaadinUI(path = '/')
class MyUI extends UI {

    @Autowired
    ItemService itemService

    @Override
    protected void init(VaadinRequest r) {

        VerticalLayout layout = new VerticalLayout()
        layout.setMargin(true)

        String homeLabel = itemService.serviceMethod()

        Label label = new Label(homeLabel)
        layout.addComponent(label)

        setContent(layout)
    }
}

That is all, now you can run the application and ItemService will be autowired.

Step 5

Run the application grails run-app and open http://localhost:8080/spring-autowiring-basics in a browser.

Running application with Navigator