From Get Programming with Scala
By Daniela Sfregola
By Joshua D. Suereth
Scala is working on language features to integrate directly with dynamic languages, but even with the 2.9.0 release, these features are considered experimental. This article from chapter 10 of Scala in Depth, focuses on an area of concern when integrating with Java—the overuse of implicit conversions to adapt Java libraries into Scala idioms.
Scala/Java Interaction: Be Wary of Implicit Conversions (PDF)