Question

How could I create non-action function at a Play 2 controller? Is any way to create utilities functions for controller?

public class Register extends Controller {
  @BodyParser.Of(BodyParser.FormUrlEncoded.class)
  public static Result registerByForm() {
      .......

  }

  // this is utility function
  private static User getFacebookIdByToken(String fbToken) {
     FacebookClient facebookClient = new DefaultFacebookClient(fbToken);
     User user = facebookClient.fetchObject("me", User.class);
     return user;
  }
}

Answer 1

In Play 1.0 there was no way to distinguish a static void foo() non-action and an action, hence the @Util annotation. My guess would be that Play 2.0 can distinguish, based on the return type, if a method is an action or not, which should only get you into trouble if you, for whatever reason, want to create a Result returning method in a Controller that is not an Action.