How can I share Array from one Controller to another

Question

I'm new to scala. What am I doing is trying to make twitter bot that collects posts from Reddit and post them to Twitter. I have to Controllers and I need to pass an array with marked reddit posts, that user want to tweet, From one controller to another. I've tried to use Singleton and Cache but, i don't know why, it's not working for me

RedditController:

var pickedToTwitter : List[RedditJsonData] = _
  def pickedRedditsPost = Action { implicit  request =>

    redditsForm.bindFromRequest.fold(
      formWithError => {
        formWithError.errors.foreach(er => Logger.debug(er.message))
        Ok(views.html.main("asd")(Html("error")))
      },
      goodOne => {
        sessionCache.set("1",pickedToTwitter = redditsJson.filter(el => goodOne.redditsList(redditsJson.indexOf(el)).checked))

        //Ok(views.html.main("asd")(Html(pickedToTwitter.mkString)))
        Redirect("/redditsSend")
      }
    )
  }

TwitterController

  val tweet : Option[List[RedditJsonData]] = sessionCache.get[List[RedditJsonData]]("1")


    def send = Action.async { request =>
      //for(i <- 0 to tweet.toList.length)  {
      val data = Map(
        "status" -> "asf"
      )

      var rt: RequestToken = new RequestToken(request.session.get("token").get, request.session.get("secret").get)

      ws.url("https://api.twitter.com/1.1/statuses/update.json?status=" + tweet.get(0).url).sign(OAuthCalculator(KEY, rt)).post("ignored").map(response => {
        Ok(views.html.main("asd")(Html(response.body)))
        //Redirect(response.body)
      })
    //}
  }

Answer 1

In my example you see a Singleton and a Cache. You need to be careful with the imports if they are slightly wrong everything crashes. I didn't get the CacheAPI to work the error needs more attention as it seems.

The singleton:

package controllers.singletons
import javax.inject.Singleton

@Singleton
class Test() {
  val message:String = "Test"
}

Controller Application:

package controllers
import javax.inject.Inject
import controllers.singletons.Test
import play.api.Play.current
import play.api.cache._
import play.api.mvc._

class Application @Inject()(test:Test)extends Controller {
  def index = Action {
    Cache.set("a", "this is a test")
    Ok(views.html.index(test.message))
  }
}

Controller CacheTest:

package controllers
import play.api.cache.Cache
import play.api.Play.current
import play.api.mvc.{Action, Controller}

class CacheTest  extends Controller{
  def cache = Action {

    Ok(views.html.cacheWorks(Cache.get("a").getOrElse("Not Working").asInstanceOf[String]))
  }
}

I have two routes

GET     /                           controllers.Application.index
GET     /cache                      controllers.CacheTest.cache

And there are two HTML pages which are getting the cache and singleton content and display it. I think that is what you can see from the code, which is pretty straight forward.