Based on a long twitter conversation, it seems like the issue Bruno is facing is similar to this one: http://stackoverflow.com/questions/22145327/nullpointerexception-javafx-label-settext

Basically, it's more of a JavaFX issue where it was trying to eagerly load the controller without instantiating it via the configured factory. I gave him an alternate solution here: https://github.com/johnament/bruno-javafx-weld