Memory leak in controllers in PlayFramework?

I have this very simple controller.

package controllers.WebService

import play.api.mvc.{Action, Controller}

object TestLeak extends Controller {
  def index = Action {
    Ok((1 to 100000).mkString)
  }
}

      

        
        
        
      

    

I open it with my browser and the memory consumption on my system is 2516 MB. Every time I refresh the memory of the page it increases by 1-2MB on every refresh. You can tell it is a browser bug, but I hit it from another PC and with the same results. This is also confirmed at the stand. -c 100 -n 1000 starts 600mb memory consumption.

And this memory allocation never decreases

Using System.gc () solves the problem, but then I have really poor performance. What's happening?

Same problem with Akka.future and scala.future and async. There are no other imports or features. just what you see.

I have had this problem for a while now and cannot deploy to Heroku without System.gc (). Any solutions?

UPDATE Actually JAVA_OPTS are not used by heroku (by stupid me), you have to declare it in Procfile

web: target/start -Dhttp.port=${PORT} ${JAVA_OPTS} ... 

JAVA_OPTS: -Xmx384m -Xss512k -XX:+UseCompressedOops -Dfile.encoding=UTF8

      

        
        
        
      

    

Memory consumption never exceeds 500 (hero limit)

Thank you time eveyone