Avoid NullPointerException when stubbing AnyVal using Mockito

Mockito stubbing with AnyVal

you need to stub some opeation like:
when(formDAO.addFile(any[InputStream], eq(special.id))) thenReturn Right(FileId(1))

and:
case class SpecialId(id: Long) extends AnyVal {
  override def toString: String = id.toString
}

since "AnyVal is the root class of all value types, which describe values not implemented as objects in the underlying host system."
and that confuses Mockito matchers...

the workaroud is:
val anySpecialId: SpecialId = SpecialId(org.mockito.Matchers.any[Long])
when(formDAO.addFormFile(any[FileInputStream], anySpecialId )) thenReturn Right(FileId(1))

now stubbed methond works corectly

(found at http://stackoverflow.com/questions/27289757/mockito-matchers-scala-value-class-and-nullpointerexception)