Trying to call a JavaFX application from Java... NoSuchMethodException


I have a main class which should call a JavaFX application (SimpleSun) to get Information from the user. Currently I create an Object of the JavaFX class and start it, but that doesn't seem to work. Does someone see the mistake in my work?

Here's my code and exception:

package ch.i4ds.stix.sim;

import ch.i4ds.stix.sim.grid.config.Configuration;
import ch.i4ds.stix.sim.grid.config.ConfigurationFromFile;

    public class Main{
    Configuration config;
    public static void main(String[] args) {
        ConfigurationFromFile config = new ConfigurationFromFile();
        SimpleSun ss = new SimpleSun(config);;

import javafx.application.Application;
import javafx.fxml.FXMLLoader;
import javafx.scene.Scene;
import javafx.scene.layout.BorderPane;
import javafx.stage.Stage;
import ch.i4ds.stix.sim.grid.config.Configuration;
import ch.i4ds.stix.sim.grid.config.ConfigurationFromFile;

public class SimpleSun extends Application{

    private Stage primaryStage;
    Configuration configuration;

    public SimpleSun(ConfigurationFromFile config) {
        this.configuration = config;

    public void start(Stage primaryStage) throws Exception {
        this.primaryStage = primaryStage;
        this.primaryStage.setTitle("Simple Sun - Alpha");
        try {
            // Load the root layout from the fxml file
            FXMLLoader loader = new FXMLLoader(
            BorderPane rootLayout = (BorderPane) loader.load();
            Scene scene = new Scene(rootLayout);
        } catch (IOException e) {
            // Exception gets thrown if the fxml file could not be loaded

    public void show(){



Exception in Application constructor
Exception in thread "main" java.lang.RuntimeException: Unable to construct Application instance: class ch.i4ds.stix.sim.SimpleSun
    at com.sun.javafx.application.LauncherImpl.launchApplication1(Unknown Source)
    at com.sun.javafx.application.LauncherImpl.access$000(Unknown Source)
    at com.sun.javafx.application.LauncherImpl$ Source)
    at Source)
Caused by: java.lang.NoSuchMethodException: ch.i4ds.stix.sim.SimpleSun.<init>()
    at java.lang.Class.getConstructor0(Unknown Source)
    at java.lang.Class.getConstructor(Unknown Source)
    ... 4 more
2/12/2014 1:31:24 PM

Accepted Answer

You must provide a constructor with no arguments when you extend application. So you could do something like:

public class SimpleSun extends Application {

    private Stage primaryStage;
    Configuration configuration;

    public SimpleSun() {
        this.configuration = Main.getConfig();

and in your Main class:

public static Configuration getConfig() { return new ConfigurationFromFile(); }

Alternatively you can pass String parameters to the class with launch(args) and get them back in the SimpleSun class with getParameters().

9/24/2017 9:44:44 AM

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