What is the _root_ package in Scala?

Question

I\'m using IntelliJ IDEA with the Scala plugin. If I reference HashMap in code, and then use Alt-Enter to add the import, the package gets imported as:

_root         


        

Answer 1

You would only need it if inside your current package you had a nested package scala.collection.immutable containing HashMap. This would be preferred by a relative import without the _root_ part.

Edit: That was not quite right, the problems start already if you have a scala package either as an ancestor or nested in the current package.