Link Details

Might be the 'Best of both worlds' aspect. A fine scripting language deployed on a rock solid, wide spread platform ?!

This "absolute" graph is more interesting and reveals more than a "percentage" one:
http://www.indeed.com/jobtrends?q=scala%2C+groovy%2C+jruby%2C+clojure&l=

My question is "Why JRuby have started growing fast by Feb 2009?" and absolute diagram is meaningless for answering that.

What I wanted to say is that comparing growths is meaningless. If there was just the JRuby curve, it's interesting, but comparing to other things doesn't bring much. For instance, you can have a 100% growth if you go from 1 to 2, but you've got the same growth from going to 100 to 200. I prefer something in the hundreds than something of the order of... one!

You are forgetting Ruby itself: an unknown language burst out from a nothing background! I, myself, am a C# developer. I have not written any serious program in a dynamic programming language. But the interesting aspect of this diagram for me was the VM; Can JVM be a bust engine for Ruby? With JRuby, Clojure, Jython,... is JVM being the platform for dynamic languages? (What do you think about parrot?) At last: Are people preferring JRuby to C implementation of Ruby?

Without this question(s) you are right; it is meaningless to compare growth of JRuby to Java. But here we can see a "Change in needs" and I ask why? (Will I have to program in a dynamic language at last?)