Scala 2.8.1 has got a bug whereby the class files it generates are broken.
They are rejected by Eclipse, disabling auto-completion for the current project and turning your workspace red.
Thus you cannot use your Scala library in Java or at least via Eclipse (which 99% of Java developers use).
Here's the original Eclipse bug report
This is the kind of stuff that makes me wonder if I'm heading in right direction.
scala bug tracking system
Edited by Bryan on Feb 16, 2011 12:24 PM