I have a Map like below 

val map : scala.collection.mutable.Map[String,Any] = Map(
  dummy1 -> ["cat1", "hash1", 101, 1373269076, {"1" : ["dummy", "dummy", "dummy"]}],
  dummy2 -> ["cat1", "hash1", 102, 1373269076, {"2" : ["dummy", "dummy", "dummy"]}],
  dummy3 -> ["cat1", "hash1", 103, 1373269076, {"3" : ["dummy", "dummy", "dummy"]}]
)

I converted it into a Json string and then wrote it into a file with the code below

Some(new PrintWriter("foo.txt")).foreach{p =>
  p.write(JSONObject(map.toMap).toString()); p.close
}

Am able to read the Json string from the file using 

val json_string = scala.io.Source.fromFile("foo.txt").getLines.mkString

How do I get my map back from the Json string above?

EDIT: Am able to read the map with 

val map1 = JSON.parseFull(json_string).get.asInstanceOf[Map[String,Any]]

But, this process is taking more time as the size of the map increases.

json scala parsing
Edit
Report