5 years ago those 3 languages were the talk of the town for alternate JVM languages, but things change. Scala's pulled way ahead of the pack, Clojure's consistent, and Groovy's on a downward trajectory, following in Beanshell's and JPython's footsteps. Eclipse users are drifting into Xtend, and IntelliJ users may look at Kotlin more. JDK 8's Nashorn is likely to scoop up those who just want to write quick-n-dirty's manipping Java classes.
Scala is the interesting one I'm interested to see if a simplified type system can be introduced ala http://www.infoq.com/presentations/data-types-issues
Within the Spring Framework 4.0 Reference , the Spring Expression Language takes up all of chapter 7, whereas Groovy takes up little section 28.3.3 only, with only one use case presented. Your statement didn't have any specifics, only sales adjectives like "great test frameworks."