public class filter {
    public static void main (String [] args) {
      System.out.println("2, 4"); 
     }
   }

FTFY, While it may be fun that show off with your favorite language, the Java version is intentionally complex.

Edit: In case you missed the point. This version is as absurd trying to be short as the other version is absurd trying to be long. Also, I can guarantee that an "Enterprise" version would be 200 lines long :-P