That's not correct. For instance, when I was programming Java Server stuff, we've used the Acegi Framework for security and the JSF Framework for MVC. You could

That's not correct. For instance, when I was programming Java Server stuff, we've used the Acegi Framework for security and the JSF Framework for MVC. You could've even used JSF together with another MVC Framework if you really wanted. But you couldn't wrap either of the two and thus making them swappable behind the wrapper.