If you are looking for a #JavaFX community away from Reddit, please upvote this:
Community for JavaFX
Community for JavaFX - programming.dev
JavaFX is the modern successor to Swing for GUI development in Java/JVM, and it needs a home on Lemmy. Will it ever be a big community? No. But on r/JavaFX there are several new posts each week. Many of the posts on r/JavaFX are questions that aren’t suitable for StackOverflow.com [http://StackOverflow.com] as they are too general or theoretical for that site. But they are perfect for a discussion forum, and the JavaFX community needs something like that. I’m sure that any JavaFX Lemmy community will be linked from JFX-Central and the other more static resources on the web.