I don't think any of these language efforts went anywhere near the support Kotlin now has in Spring. Doesn't mean it will not fail, but it is already further than any other..

Sure they were, Pivotal was screaming across all winds on Java conferences, just like they are doing nowadays with Kotlin.

They are just betting on a new horse after the old ones failed to win the races they were set off to.

I kept being downvoted when I talked about S4TF going nowhere and the news today prove many of us were right about it.

Similarly I will give about 5 years time for Kotlin fashion to die everywhere outside Android, this assuming that Fuchsia won't eventually become the new darling.

It is quite telling that Google's own business units like Ad Words and Google Pay rather go with Flutter, and write blog posts about it, instead of adopting KMM.

Jetpack Composer is a political answer to Flutter.

I remember many years ago when Pivotal's website was featuring a module for Spring Scala saying something about concise API and other functional buzzwords. The same for Groovy, earlier.