JavaFX application won't compile in NetBeans IDE 8.1 - javafx

Question

I am trying to run this application in which I used event-handling and it won't compile and won't show anything. I am currently using NetBeans 8.1. What is that I did wrong. Also it is not showing any errors.
import javafx.application.Application;
import javafx.event.ActionEvent;
import javafx.event.EventHandler;
import javafx.geometry.Pos;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.layout.HBox;
import javafx.scene.layout.StackPane;
import javafx.stage.Stage;
public class event extends Application {
public void start(Stage primaryStage)
{
HBox pane = new HBox();
pane.setAlignment(Pos.CENTER);
Button btOk = new Button("OK");
Button btCancel = new Button("Cancel");
OkHandlerClass handler1 = new OkHandlerClass();
btOk.setOnAction(handler1);
CancelHandlerClass handler2 = new CancelHandlerClass();
pane.getChildren().addAll(btOk, btCancel);
Scene scene = new Scene(pane);
primaryStage.setTitle("Handle the fucking event");
primaryStage.setScene(scene);
primaryStage.show();
}
class OkHandlerClass implements EventHandler<ActionEvent>{
public void handle(ActionEvent e) {
System.out.println("OK button clicked");
}
}
class CancelHandlerClass implements EventHandler<ActionEvent>{
public void handle(ActionEvent event) {
System.out.println("Cancel button clicked");
}
}
public static void main(String[] args) {
launch(args);
}
}