I don't know about Clojure, for example, but Kotlin targeted Java 7 for a long time. By which I mean that the standard library didn't use anything from Java 8 o

I don't know about Clojure, for example, but Kotlin targeted Java 7 for a long time. By which I mean that the standard library didn't use anything from Java 8 or later, and the compiler would emit Java 7 compatible code by default. You can still compile it to target later versions, though. It's only fairly recently bumped up to Java 8 being its minimum (and default) Java version.