Is the GWT mandatory in a deployment with Vaadin framework.
I mean is the Vaadin framework builded over the GWT and then not using GWT is not possible. I ask because some manager asked me but I was not able to answer if it can be used separately or not.
I know the GWT does not need Vaadin but what about the inverse?
You can use Vaadin without GWT. Vaadin 7 and 8 client side code is precompiled with GWT. Thus you need GWT only for adding new widgets to Vaadin 7 or 8.