The answer is “it depends,” but personally I like ktor/micronaut better or golang’s stdlib. I do a lot of REST work right now, and I try to keep my services small.
I've also used Go without ORM-like libraries. For Java/Kotlin I've been trying out Javalin + JDBI which isn't too bad. You just have to roll your own things (or do the integration with what's available) sometimes. My apps start in 1/10s of seconds.
I wouldn't recommend it for a team that's used to copy/pasting from StackOverflow to get things done.
Which ones would you recommend instead of Spring?