I could have the wrong impression, but from all the dead libraries I've come across it feels like it used to be all over the place with people doing math, visualizations/art, music, people trying to run on Android (seemingly the only JVM language that has no Android ecosystem/workflow.. crazy) etc.. Now a lot of that has atrophied and looks like it's mostly all about web. Though there are still interesting nonweb things going on - it just feels like a shrinking fraction
Either way, a big congrats to the people involved. Happy for you guys. That you for all your hard work, the beautiful language that has made me enjoy programming more than ever, and all for free :)