After a lot of problem isolation, I got this snippet: object Snippet { def main(args: Array[String]): Unit = { println("Snip demo:: "+ util.Properties.versionString) println(" jvm "+System.getProperty("java.version")) import javax.sound.sampled._ val mixers : Array[Mixer.Info] = javax.sound.sampled.AudioSystem.getMixerInfo() println(" Numer of mixers: "+ mixers.size) for (mi : Mixer.Info <- mixers