We have implemented an integration of the Leaflet map in Vaadin Flow:
It helps a lot when you want to configure and use a Leaflet map in your Java Application without doing everything in JavaScript.
So far people seem to like it and create lots of feature requests for it: Issues · xdev-software/vaadin-maps-leaflet-flow · GitHub
Please feel free to share your feedback here or on GitHub. (although our development-team only works on GitHub-Issues)
Johannes
XDEV Support