QueryDSL is still actively being developed, as can be observed from the "contributors insights" tab:
https://github.com/querydsl/querydsl/graphs/contributors
So yes it's actively developed. I can't speak about adoption, but going by the issue tracker, Stackoverflow and this Google group, there are a ton of active users out there.
Op dinsdag 18 februari 2020 om 03:13:34 UTC+1 schreef Shawn: