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Java 8 will bring lambda function and closures to the Java-verse. These tools will revolutionize programming using Java, leading to shorter more declarative code. But how can we prepare ourselves for this? A number of JVM-based languages already have support for lambda functions and closures: dynamically-typed languages like Groovy, and statically-typed languages like Scala and Kotlin. Can looking at examples of how to solve problems in these languages teach us how to do things in Java 8? Yes. Of course the observation of how programming changes may get people to start using Groovy, Scala, Kotlin, etc. instead of Java. The critical thing here is that we can realize the revolution in an evolutionary way. The JVM allows for all of these languages to work together, we can program bits in Java, bits in Groovy, bits in Scala, etc. So we can evolve extant systems by rewriting bits a little at a time. In this session we will look at these issues and a collection of examples to try and ascertain what the idioms might be in a post-Java 8 world.