[jillesvangurp]

Spring Boot pretty much dominates. I think Play market share is a bit more in the long tail of alternatives. Also, it's very Scala centric and not widely used without Scala.

Spring is increasingly Kotlin centric and the combination is pretty nice. There's a wide variety of other frameworks such as vert.x, ktor, quarcus, etc. They are popular but compared to Spring quite niche.

With Graal and Kotlin native, the whole space is becoming less JVM centric as well. E.g. Spring Native just went into beta and Ktor has been inching closer to working on the Kotlin Native compiler for a while now (still some missing pieces). Particularly for serverless, this is relevant due to reduced startup time. Overall performance is not significantly better though.