FieldReferenceLinker.scala

if(isComposite) {
  _compositeKeyMembers.set(Some(new ArrayBuffer[SelectElement]))
  println("set members to empty ArrayBuffer")
}
var res = proxy.invokeSuper(o, args);

if(isComposite) {
  val ck = res.asInstanceOf[CompositeKey]
  println("members before: " + ck._members)
  ck._members = Some(_compositeKeyMembers.get.get.map(new SelectElementReference[Any](_)(NoOpOutMapper)))
  ck._propertyName = Some(m.getName)
  //_compositeKey.set(Some(_compositeKeyMembers.get.get.map(new SelectElementReference[Any](_)(NoOpOutMapper))))
  _compositeKeyMembers.set(None)
  println("members afterwards: " + ck._members)
}