Answering my own question.
I download the ‘full’ version of Vaadin and use Netbeans.
I add only the Jars necessary to compile and run - I don’t add everything.
My WAR file is about 20gb, not 100 and when I compile, it takes seconds, not minutes.
Turns out that the GRID in version 7.5.2 requires the guava-16.0.1.vaadin1.jar . Added this jar to the library and everything worked.