[Solved]-In Play 2.4 with DI, how to use a service class in "Secured" trait?-scala

I think the simplest approach would be to declare the authService in your trait but keep it abstract, then have the controller which extends it handle the injection (I believe this is how MessagesApi/I18nSupport injection works). So you could do:

trait Secured {
  val authService: AuthService
  ...
}

controller Application @Inject()(override val authService: AuthService) extends Controller with Secured {
  ...
}