Pre jdk9 prints only "i" with the following code:

import javax.script.*;

public class Main {
   public static void main(String[] args) throws Exception {
      ScriptEngineManager m = new ScriptEngineManager();
      ScriptEngine e = m.getEngineByName("nashorn");
      e.put(ScriptEngine.FILENAME, "foo");
      e.eval("for (var i in this) print(i)");
   }
}


jdk9 nashorn tip prints "i" and "javax.script.filename". So "javax.script.filename" has become enumerable. We need to restore the old behavior.