gistfile1.txt

import play.api.libs.json.Json
val j= """
         |[
         |  {
         |    "_key": "A1",
         |    "name": "Foo and Bar",
         |    "contents": [
         |      {
         |        "Android Wear": [
         |          "Notifications",
         |          "Voice Actions",
         |          "Datenaustausch",
         |          "Listen"
         |        ],
         |        "Android Lollipop & Marshmallow": [
         |          "App Bar",
         |          "Material Design",
         |          "Styling & Theming",
         |          "Data Binding",
         |          "Transitions",
         |          "Rechte Management",
         |          "Android TV",
         |          "Floating Toolbar",
         |          "Recycler Views"
         |        ],
         |        "API's": [
         |          "Google Maps & Position",
         |          "Google Locations",
         |          "Google Sign in"
         |        ]
         |      }
         |    ],
         |    "level": 2
         |  },
         |  {
         |    "_key": "A2",
         |    "name": "More Foo and Bar",
         |    "contents": [
         |      {
         |        "Android Wear": [
         |          "Notifications",
         |          "Voice Actions",
         |          "Datenaustausch",
         |          "Listen"
         |        ],
         |        "Android Lollipop & Marshmallow": [
         |          "App Bar",
         |          "Material Design",
         |          "Styling & Theming",
         |          "Data Binding",
         |          "Transitions",
         |          "Rechte Management",
         |          "Android TV",
         |          "Floating Toolbar",
         |          "Recycler Views"
         |        ],
         |        "API's": [
         |          "Google Maps & Position",
         |          "Google Locations",
         |          "Google Sign in"
         |        ]
         |      }
         |    ],
         |    "level": 2
         |  }
         |
         |]""".stripMargin

case class Course( _key: String, name: String, contents: Seq[Map[String, Seq[String]]])

implicit val readsCourse = Json.reads[Course]

val t: Seq[Course] = Json.parse(j).as[Seq[Course]]

println(t)

#
List(Course(A1,Foo and Bar,List(Map(Android Wear -> List(Notifications, Voice Actions, Datenaustausch, Listen), Android Lollipop & Marshmallow -> List(App Bar, Material Design, Styling & Theming, Data Binding, Transitions, Rechte Management, Android TV, Floating Toolbar, Recycler Views), API's -> List(Google Maps & Position, Google Locations, Google Sign in)))), Course(A2,More Foo and Bar,List(Map(Android Wear -> List(Notifications, Voice Actions, Datenaustausch, Listen), Android Lollipop & Marshmallow -> List(App Bar, Material Design, Styling & Theming, Data Binding, Transitions, Rechte Management, Android TV, Floating Toolbar, Recycler Views), API's -> List(Google Maps & Position, Google Locations, Google Sign in)))))