Sample JavaFX application for use Nashorn JavaScript Engine in jdk8

Launcher.java

import javafx.application.Application;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.control.TextArea;
import javafx.scene.layout.BorderPane;
import javafx.scene.layout.HBox;
import javafx.scene.layout.VBox;
import javafx.stage.Stage;
import jdk.nashorn.api.scripting.NashornScriptEngine;
import jdk.nashorn.api.scripting.NashornScriptEngineFactory;

import javax.script.ScriptException;
import java.io.PrintWriter;
import java.io.StringWriter;


public class Launcher extends Application {

    TextArea textArea;
    TextArea consoleTextArea;

    @Override
    public void start(Stage primaryStage) throws Exception {
        BorderPane root = new BorderPane();
        Scene scene = new Scene(root);

        textArea = new TextArea();
        consoleTextArea = new TextArea();
        consoleTextArea.setEditable(false);
        Button runButton = new Button("Run");
        Button cleanButton = new Button("Clean console");

        cleanButton.setOnAction((e) -> {
            consoleTextArea.clear();
        });

        runButton.setOnAction((e) -> {
            NashornScriptEngine engine = (NashornScriptEngine) new NashornScriptEngineFactory().getScriptEngine();
            StringWriter writer  = new StringWriter();
            engine.getContext().setWriter(writer);
            try {
                engine.eval(textArea.getText());
            } catch (ScriptException e1) {
                e1.printStackTrace(new PrintWriter(writer));
            }
            consoleTextArea.setText(writer.toString());
        });

        root.setCenter(textArea);
        root.setBottom(new VBox(){{
            getChildren().addAll(new HBox(){{
                setSpacing(15);
                getChildren().addAll(runButton, cleanButton);
            }}, consoleTextArea);
        }});

        primaryStage.setScene(scene);
        primaryStage.setTitle("Nashorn JavaScript Engine");
        primaryStage.show();
    }

    public static void main(String[] args) {
        launch(args);
    }
}