I have Eclipse Indigo with the Scala IDE plugin. I downloaded a lift project from Maven. It builds correctly. Eclipse says it is viewing it with the Scala editor.
How
This problem can show up when you copy an existing java project to start a new project or use a project file generator.
One thing you can look at is your Java Build Path
inside project properties.
Make sure your scala source folder doesn't have an include filter like **/*.java
.
Make sure it is **/*.scala
or remove it and your source should be detected by the scala plugin.