Stax.scala

object StaX extends App {

  
  import scala.io.Source
  import java.io.File
  
  import javax.xml.stream._
  
  val  inputFactory = XMLInputFactory.newInstance();
  
  //val src = Source.fromFile(new File("e:/downloads/medsamp2014.xml"),"UTF-8")
  val src = Source.fromFile(new File("e:/downloads/enwiki-20140402-abstract.xml"),"UTF-8")
  
  val er = inputFactory.createXMLEventReader(src.reader)
  
  var count=0;
   while (er.hasNext&&count<10){
     val ev=er.nextEvent()
     count+=1
     println(s"$count:\t$ev")
   }
}

You can make it even more Scala friendly thus:

implicit class XMLEventIterator(ev:XMLEventReader) extends scala.collection.Iterator[XMLEvent]{
def hasNext=ev.hasNext
def next=ev.nextEvent()
}

er.dropWhile(!_.isStartElement()).take(10).zipWithIndex.foreach{case (ev,idx)=>println(s"${idx+1}:\t$ev")}