How to convert scala.some to scala.mutable.Map?

i am trying to write code to mask nested json fields..

 def maskRecursively(map :mutable.Map[String,Object]):mutable.Map[String,Object] ={
val maskColumns = PII_Data.getPIIData()
for((k,v) <- map){
  if(v.isInstanceOf[Map[String,Object]]){
    maskRecursively(map.get(k).asInstanceOf[mutable.Map[String,Object]])
  }else if(v.isInstanceOf[List[Object]]) {

  } else {
    if(maskColumns.contains(k)){map+=(k->"*****")}
  }

}


map }

calling this method from ..

val mapper = new ObjectMapper()
    mapper.registerModule(DefaultScalaModule)
    val result = mapper.readValue(jsonStr, classOf[ java.util.Map[String,Object] ])
    import scala.collection.JavaConverters._
    val myScalaMap = result.asScala
    maskRecursively(result.asScala)

i am getting error while trying to iterate a nested json object ..

Cannot cast value of type 'scala.Some' to type 'scala.collection.mutable.Map'

how do i recurse a complex nested json object this way ?

After some digging , i was able to solve this..

    def maskJson(jsonStr: String): String = {
    implicit val formats = org.json4s.DefaultFormats
    val mapper = new ObjectMapper()
    mapper.registerModule(DefaultScalaModule)
    val result = mapper.readValue(jsonStr, classOf[Map[String, Object]])
    val maskedJson = maskRecursively(result)
    mapper.writeValueAsString(maskedJson)

  }


  def maskRecursively(map: Map[String, Object]): collection.mutable.Map[String, Object] = {
    val mutable = collection.mutable.Map[String, Object]()
    val maskColumns = PII_Data.getJsonPIIFields()
    for ((k, v) <- map) {
      if (v.isInstanceOf[Map[String, Object]]) {
        mutable += k -> maskRecursively(v.asInstanceOf[Map[String, Object]])
      } else if (v.isInstanceOf[List[Object]]) {
        val list = v.asInstanceOf[List[Map[String, Object]]].map(i => maskRecursively(i)).toList
        mutable += k -> list
      } else {
        if (maskColumns.contains(k)) {
          mutable += (k -> "*****")
        }
        else {
          mutable += k -> v
        }
      }
    }
    mutable
  }