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Java 8 Lambdas and JRuby 9000?
JRuby 1.7 works on Java 6 and higher, but we removed the Java 6 support for JRuby 9000 because we really wanted to use invoke dynamic more. We're essentially doing most of what Java 8 Lambdas already did at a language level. If you have a Java call that you want to make from Ruby and it takes an interface, we will automatically make the Ruby code implement that interface for you.