I moved from Scala back to Java (not because I like Java so much, but because the current project requires it). And lambdas and traits are not the main features

I moved from Scala back to Java (not because I like Java so much, but because the current project requires it). And lambdas and traits are not the main features I miss. Much more I miss lazy evaluation, pattern matching, much better type system (variance, type classes, dependent types, even erasure is not that painful) and awesome collection library. None of those things are in Java 8, nor planned in any future version.