I\'m using sbt to build scala projects, but it always seems too complex(unfamiliar) and heavy to me. I\'m also using gradle to build java projects, and which makes me hap
It's quite easy to use gradle with Scala. We did it for a long time (team mixed of Java ,Groovy and Scala developers) and have been quite happy with it. Most things work quite well out of the box.
More about gradle with scala: http://www.gradle.org/docs/current/userguide/scala_plugin.html
There are some problems/downfalls though:
It's definitely possible. Gradle's Scala support is documented in the "Scala plugin" chapter in the Gradle User Guide. The plugin is used by big companies on big projects, and can be configured to use the same incremental Scala compiler as sbt. So best try for yourself and see if it fits your requirements.