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JRuby 9000: Invoke Dynamic Invocations
The invoke dynamic byte code was introduced in Java 7 to help languages other than Java such as JRuby. In Java 8, the support for Lambdas is bootstrapped using invoke dynamic because you can run this code once and then optimize it just like any other piece of Java code. There's more features in Java 9 that are going to be using invoke dynamic under the covers due to its flexible nature.