How to use Scala in IntelliJ IDEA (or: why is it so difficult to get a working IDE for Scala)?

Question

I recently gave up trying to use Scala in Eclipse (basic stuff like completion doesn\'t work). So now I\'m trying IntelliJ. I\'m not getting very far.

I\'ve been able to

Answer 1

You are mixing code compiled with two different Scala versions.

Answer 2

I had the same problem yesterday while trying to set it up. Solution is pretty simple, you just have to set scala somewhere in project settings.

Answer 3

I had similar problem, following this blog post instructions solved the problem for me