runtime error - Scala forward referencing -

i'm new scala. i'm making game , have list of locations character can visit, of type location. have case class , companion object achieve this.

linkedlocations inside location array of type location , can have number of locations location can lead to. in case, room 1 leads room 2, , vice versa.

case class location(name: string, desc: string, linkedlocations: array[location]){}  object location {    val none: location = location("none","none",array(none))   val room1: location = location("room 1","you in room 1",array(room2))   val room2: location = location("room 2","you in room 2",array(room1))    room1.linkedlocations.foreach(location=>println(location.name)) } 

i've tried making them lazy vals end stack overflow. how fix forward referencing problems this? there better way design this?

this looks graph representation--typically forward references avoided decoupling graph nodes (locations in case) graph edges (linked locations). can neighboring information typically through hash map. like:

case class location(name: string, desc: string)  object location {    val none: location = location("none","none")   val room1: location = location("room 1","you in room 1")   val room2: location = location("room 2","you in room 2")    val neighbormap: map[location, array[location]] = map(     room1 -> array(room2),     room2 -> array(room1)   ) } 

and can do:

neighbormap(room1).foreach(location => println(location.name))