import com.mycompany.backend.testblock.DocuIF
import com.mycompany..models.entity.Document
import javax.ejb.EJB;
import com.vaadin.cdi.CDIUI;
 
@Theme("demo-theme")
@CDIUI("")
public class MyUI extends UI {
 
@EJB  
DocuIF docu;
 
public static class Servlet extends VaadinCDIServlet {
@Override
        protected void servletInitialized() throws ServletException {
       super.servletInitialized();
   //.....................
   }
 
protected void init(final VaadinRequest request) {

List<Document> getallDocu = docu.getAll();  //---- Here the Entity can be perfectly initialised!!!
//..........
  }
}

import com.mycompany.backend.testblock.DocuIF
import com.mycompany..models.entity.Document
import javax.ejb.EJB;
import com.vaadin.cdi.CDIView;

public final class ConditionModel  extends VerticalLayout implements View {

public static final String VIEW_ID = "dashboard";

@EJB  
DocuIF docu;

@CDIView(value = ConditionModel.VIEW_ID)
// I tried to play with some other annotations : @UIScoped; @ManagedBean; @SessionScoped but it does not help

public ConditionModel()  {  //constructor

List<Document> getallDocu = docu.getAll();   //Here docu = null 
//.....................

  }
}

 protected void init(final VaadinRequest request) {
//....
  navigator.addView("condmodel", ConditionModel.class);
}

 @Inject
    private CDIViewProvider viewProvider;

@CDIView("dashboard")

@PostConstruct 
//   protected
         void initialize() {
    List<Document> getallDocu = docu.getAll();
    BeanItemContainer<> kontDoku = new BeanItemContainer<>(Document.class, getallDoku);    
    kontDoku.removeAllItems();
//................
}

navigator.addProvider(viewProvider);
navigator.addView("dashboard", ConditionModel.class);