adam bien's blog

1. Create a Java EE 6 Maven 3 War Project
2. Create beans.xml with the content <beans/> and put it into [WAR]/WEB-INF folder
3. Add a single dependency to vaadin:

   <dependency>
   <groupId>com.vaadin</groupId>
   	<artifactId>vaadin</artifactId>
   	<version>6.8.1</version>
   </dependency>
   

4. Create a qualifier:

   
   @Qualifier
   @Retention(RUNTIME)
   @Target({FIELD, TYPE})
   public @interface VaadinApplication {}
   
   

5. Create a servlet and inject the Vaadin application. The JavaEEIntegrationServlet servlet is reusable:

   import com.vaadin.Application;
   import com.vaadin.terminal.gwt.server.AbstractApplicationServlet;
   import javax.inject.Inject;
   import javax.servlet.ServletException;
   import javax.servlet.annotation.WebServlet;
   import javax.servlet.http.HttpServletRequest;
   
   @WebServlet(urlPatterns = "/*")
   public class JavaEEIntegrationServlet extends AbstractApplicationServlet {
   
       @Inject @VaadinApplication
       Application application;
   
       @Override
       protected Class getApplicationClass() throws ClassNotFoundException {
           return application.getClass();
       }
       @Override
       protected Application getNewApplication(HttpServletRequest request) throws ServletException {
           return application;
       }
   }
   
   

6. Create an application as @SessionScoped managed bean annotated with the VaadinApplication qualifier:

   
   import com.abien.vaadin.helloapp.greetings.boundary.Greetings;
   import com.vaadin.Application;
   import com.vaadin.ui.*;
   import javax.enterprise.context.SessionScoped;
   import javax.enterprise.event.Event;
   import javax.inject.Inject;
   
   
   @SessionScoped 
   @VaadinApplication
   public class HelloApp extends Application {
   
       @Inject
       Greetings greetingService;
   
       @Inject
       Event buttonEvents;
       
       @Override
       public void init() {
           VerticalLayout layout = new VerticalLayout();
           layout.setMargin(true);
   		//...
           Window mainWindow = new Window("Vaadin 6.8 - Java EE Integration", layout);
           setMainWindow(mainWindow);
       }
   }
   
   

7. Now EJB 3 and CDI injection should work as expected:
   
   @Stateless
   public class Greetings {
       
       @Inject
       TimeProvider provider;
   
       public String sayHello(String name) {
           return "Hello " + name + " at: " + provider.getCurrentTime();
       }
   }
   
   public class TimeProvider {
   
       public long getCurrentTime(){
           return System.currentTimeMillis();
       }
   }
   
   

The Maven 3 project was pushed to https://github.com/AdamBien/vaadin-javaee