Using Grails services in Vaadin

We will make a bit of an interactive application in this recipe. A client will be able to add new users into the database and the user interface will reflect the actual state of the User database table.

The following screenshot shows what we are going to develop in this recipe:

How to do it...

Carry out the following steps, in order to use Grails services inside Vaadin application:

1. Create a new domain class called User inside the grails-app/domain folder.

   class User {
   
     String name
   
     static constraints = {
     }
   }

2. Create a new service for the User class. We will implement the getAll method that returns all the users from the database and the add method that stores a new user in the database. The following screenshot shows how to make the service in Eclipse:

   

   Now type the name of the domain class we want to make the service for.

   

   The following code shows what has been generated by the Grails framework. Add the getAll and add methods into the UserService class.

   class...