Vaadin 7 - client=>server

Hello everybody

Im one week newbie. And I had much more experience with GWT/SmartGWT, and I read a few articles about rpc in Vaadin but it is still for me very unclear. especially in vaadin 7.
I have just added Vaadin to Gwt autogenerated project and rpc dont work as it used to in gwt. Console says nothing even system.out.println …

hmmm strange, in big shortcut, could You suggest some method\ vaadin technology for just getting pure data from DB and sending it directly to browser but not displaying it anywhere ?? or show me some example ? how to start deal with this situations ?