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By leveraging the JVM, they were able to re-use existing compiled Java classes alongside the Scala classes.

Slide 25 hints at this, but I seem to recall Alex saying they used the Java-based Apache HttpClient in their test cases.

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I'm learning Scala as a first JVM language, and it is definitely great to be able to access so many Java libraries so seamlessly (Mina, Apache commons, Hadoop, ...), all the Scala syntax/type inference goodness just works and in some cases make the libraries significantly nicer to use in Scala than in Java (IMO).

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