Gradle v3

src/main/java/de/uni_hannover/hci/tictactoe/HelloApplication.java

-package de.uni_hannover.hci.tictactoe;
-
-import javafx.application.Application;
-import javafx.fxml.FXMLLoader;
-import javafx.scene.Scene;
-import javafx.stage.Stage;
-
-import java.io.IOException;
-
-public class HelloApplication extends Application {
-    @Override
-    public void start(Stage stage) throws IOException {
-        FXMLLoader fxmlLoader = new FXMLLoader(HelloApplication.class.getResource("hello-view.fxml"));
-        Scene scene = new Scene(fxmlLoader.load(), 320, 240);
-        stage.setTitle("Hello!");
-        stage.setScene(scene);
-        stage.show();
-    }
-
-    public static void main(String[] args) {
-        launch();
-    }
-}
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src/main/java/de/uni_hannover/hci/tictactoe/HelloController.java

-package de.uni_hannover.hci.tictactoe;
-
-import javafx.fxml.FXML;
-import javafx.scene.control.Label;
-
-public class HelloController {
-    @FXML
-    private Label welcomeText;
-
-    @FXML
-    protected void onHelloButtonClick() {
-        welcomeText.setText("Welcome to JavaFX Application!");
-    }
-}
\ No newline at end of file