[jbooth]

Scala has much worse tooling (SBT is an oxymoron), and it's much harder to read than Java.

Conceding that it's more fun to write, I think 'harder to read' is more important. Scaling refers to team size and amount of functionality in addition to requests per second.

[felipehummel]

The "much harder to read" varies greatly between codebases. Most "sane" codebases are 90% (random percentage) as easy to read as Java. Just collection initialization, transformations, simple pattern-matching, method invocations... Some times there is an ugly nested flatMaps/maps/filters. But in my experience, in general, they're more the exception than the rule.

[jspthrowaway2]

It's also the slowest compilation I've ever seen, even with really clever custom tooling.

[felipehummel]

Scala compilation is indeed slow (although I think C++ is worse). But I always have a "sbt ~compile" running, compiling every file as they change. So the compilation time is pretty much irrelevant to me. While using eclipse, I guess, you'd get the same speed too.