Play 2 - Can't return Json object in Response

Play 2 - Can't return Json object in Response

I'm trying to do some RESTFull Web service POC using Play 2.1.3
I have the following class:
case class Student(id: Long,firstName: String,lastName: String)
Now I would like to create RESTfull URI which will get Json serialised
Student POJO and return the same POJO in response.
implicit val studentReads = Json.reads[Student]
implicit val studentWrites = Json.writes[Student]
def updateStudent = Action(parse.json){
request=>request.body.validate[Student].map{
case xs=>Ok(xs)}.recoverTotal{
e => BadRequest("Detected error:"+ JsError.toFlatJson(e))
}
}
But I'm getting compilation Error -
Cannot write an instance of entities.Student to HTTP response. Try to
define a
Writeable[entities.Student]
I just provided Writes[A] as an implicit variable.
What else do I missing?