5. What is the principal JVM language you use for your main applications?
Exactly 9 in 10 JVM users are using Java for their main applications. ... Despite this strong preference for Java, JVM-based developers have consistently shown great interest in other JVM languages ...
The 3.0% figure for Clojure is remarkably high
and signals–to us at least–the continued interest in functional programming. The functional orientation of many Java 8 features shows the imprint of functional programming on Java itself.