Great add-on! Please tell me how can I use any other GIS-servers such as Yandex of Double GIS (which has it’s own API)? Thank You for your work and attention!
This https://vaadin.com/directory#addon/v-leaflet-shramov-extensions:vaadin could be easily extended to support Yandex. I started that once, but couldn’t find dev docs in other but russian, and my skills only consist of ordering a beer :-)