import reflect.runtime.currentMirror

trait Baz { self: Baz1 =>
  class Bar
}

class Baz1 extends Baz

object Foo {
  def main (args: Array[String]){
    val x = new Baz1

    val sym = currentMirror.classSymbol(classOf[Baz#Bar])
    val clMirror = currentMirror.reflect(x).reflectClass(sym)

    val constr = clMirror.reflectConstructor(sym.primaryConstructor.asMethod)
    constr.apply()
  }
}

Exception in thread "main" java.lang.NoSuchMethodException: Baz$Bar.<init>(Baz)
	at java.lang.Class.getConstructor0(Class.java:2902)
	at java.lang.Class.getDeclaredConstructor(Class.java:2066)
	at scala.reflect.runtime.JavaMirrors$JavaMirror$$anonfun$constructorToJava$1.apply(JavaMirrors.scala:1287)
	at scala.reflect.runtime.JavaMirrors$JavaMirror$$anonfun$constructorToJava$1.apply(JavaMirrors.scala:1281)
	at scala.reflect.runtime.TwoWayCaches$TwoWayCache$$anonfun$toJava$1.apply(TwoWayCaches.scala:50)
	at scala.reflect.runtime.Gil$class.gilSynchronized(Gil.scala:19)
	at scala.reflect.runtime.JavaUniverse.gilSynchronized(JavaUniverse.scala:16)
	at scala.reflect.runtime.TwoWayCaches$TwoWayCache.toJava(TwoWayCaches.scala:45)
	at scala.reflect.runtime.JavaMirrors$JavaMirror.constructorToJava(JavaMirrors.scala:1281)
	at scala.reflect.runtime.JavaMirrors$JavaMirror$JavaMethodMirror.jconstr$lzycompute(JavaMirrors.scala:332)
	at scala.reflect.runtime.JavaMirrors$JavaMirror$JavaMethodMirror.jconstr(JavaMirrors.scala:332)
	at scala.reflect.runtime.JavaMirrors$JavaMirror$JavaVanillaMethodMirror0.jinvokeraw(JavaMirrors.scala:365)
	at scala.reflect.runtime.JavaMirrors$JavaMirror$JavaMethodMirror.jinvoke(JavaMirrors.scala:339)
	at scala.reflect.runtime.JavaMirrors$JavaMirror$JavaVanillaMethodMirror.apply(JavaMirrors.scala:355)
	at Foo$.main(Foo.scala:17)
	at Foo.main(Foo.scala)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:606)
	at com.intellij.rt.execution.application.AppMain.main(AppMain.java:140)