As of know,i see the Java API examples are demonstrated with either swing or javafx.
we're planning to build an map app using vaadin with esri's java api for the web
we're not using JS api.
vaddin support esri-leaflet via a plugin
please give more details on this..
do you have any plan to release support for vaadin ? if not please consider this
i dont think it will be a difficult task as you have already support for swing.