Suppose you've a trait that you will implement in child classes -

trait AppMessage {} 

Given this injections

 val mapBinder = ScalaMapBinder.newMapBinder[String, AppMessage](binder) mapBinder.addBinding("A").toInstance(new AppMessageSampleA) mapBinder.addBinding("B").toInstance(new AppMessageSampleB) 

and calling them with val map = injector.instance[im.Map[String, AppMessage]] throws not found exception.

Need to support traits