HI, i know that vaadin is a component based framework. I’m asking if vaadin follows the MVC pattern???
Please, help 
It depends on what you exactly mean by “MVC-Framework”. It is of course possible to adhere to the MVC- or MVP-Patterns with Vaadin and Vaadin itselfs deploys those patterns internally too. But it does not force you to build your own applications according those patterns, as a “Framework” would normally do. But Vaadin isn’t a Framework, it is a library.