I have a solid background in Java, having used it for over ten years. Like many Java developers, I’m excited about the new JVM languages available, particularly Scala. The Scala language really hits the sweet spot of general-purpose languages, in my opinion, encouraging functional programming while recognizing that the object-oriented paradigm is useful in many situations. It is simultaneously concise, fast, and expressive, yet offers powerful compile-time checks. I think automated testing great, but it should complement good engineering and compiler checks, rather than replacing them.
Of the major Java IDEs, I prefer IntelliJ IDEA, though I have had a lot of experience with both NetBeans and Eclipse. Eclipse seems to be the least stable and intuitive, while IntelliJ has simultaneously a great feature set and is easy to use.