Javafx alert repeating every x seconds

HelloController.java

import javafx.animation.KeyFrame;
import javafx.animation.Timeline;
import javafx.application.Platform;
import javafx.fxml.Initializable;
import javafx.scene.control.Alert;
import javafx.scene.control.ButtonType;
import javafx.util.Duration;
import java.net.URL;
import java.util.Optional;
import java.util.ResourceBundle;

public class HelloController implements Initializable {

    //Change dutation time to change how often the alert is showing
    Timeline alertTimer = new Timeline(new KeyFrame(Duration.seconds(5), event ->{
        showAlert();
    }));

    @Override
    public void initialize(URL url, ResourceBundle resourceBundle) {
        alertTimer.play();
    }

    public void showAlert(){
        Platform.runLater( () -> {
            Alert alert = new Alert(Alert.AlertType.CONFIRMATION);
            alert.setTitle("Alert!");
            alert.setContentText("This is an alert");
            Optional<ButtonType> result = alert.showAndWait();


            if(result.isEmpty()){
                System.out.println("Alert closed");
                alertTimer.play();
            } else if(result.get() == ButtonType.OK){
                System.out.println("OK!");
                alertTimer.play();
            } else if(result.get() == ButtonType.CANCEL){
                System.out.println("Never!");
                alertTimer.play();
            }
        });

    }
}