Authentication in vaadin

I am new to Vaadin. Could you tell me how authentication should be implemented in vaadin? I am trying to implement in J2EE way; hoever, I am having some issues. Is there an example or documentation that would give me an idea of the stuff?

Thanks in advance


There are several tutorials how to implement a web login or an authentication with Vaadin framework. See for example the link below

There is also a full application example of the wiki article

Thank you very much.