Vaadin on grails - multiple UIs

Versions used in this tutorial: Grails 2.3.x, Vaadin 7.1.x. News and updates about Vaadin on Grails are available on VaadinOnGrails. This is continuation of Vaadin on Grails - Database access

In grails-app/conf/VaadinConfig.groovy, we can change URL mapping to UI. Also, we can define multiple UIs to be accessible from one Grails application.

Create two new UIs that we will show under different URLs. ClientUI will be available on http://localhost:8080/client and ServerUI on http://localhost:8080/server

class ClientUI extends UI {
  protected void init(VaadinRequest request) {
    VerticalLayout layout = new VerticalLayout()
    layout.setMargin(true)
    Label label = new Label("Client")
    layout.addComponent(label)
    setContent(layout)
  }
}

class ServerUI extends UI {
  protected void init(VaadinRequest request) {
    VerticalLayout layout = new VerticalLayout()
    layout.setMargin(true)
    Label label = new Label("Server")
    layout.addComponent(label) setContent(layout)
  }
}

Open VaadinConfig.groovy and change the mapping, so the mapping points to the new UIs.

mapping =
[ "/client/*": "app.ClientUI",
  "/server/*": "app.ServerUI"]

Now we can start up the application and access both URLs to see each is mapped to different UI class.