JavaFx: use webengine to get javascript rendered dom in a server program

In a server program (means no X installed) I really just want to load a html site containing some javascript and get the rendered dom. I want to do this in the way of using a static function. My problem is that I am not able to get the threads joined/finished.

package svg;

import javafx.application.Application;
import javafx.application.Platform;
import javafx.beans.value.ChangeListener;
import javafx.beans.value.ObservableValue;
import javafx.concurrent.Worker;
import javafx.scene.web.WebEngine;
import javafx.scene.web.WebView;
import javafx.stage.Stage;
import kic.engine.util.DomUtils;
import javafx.embed.swing.JFXPanel;

public class Render extends Application {
    private static final JFXPanel USELESS = new JFXPanel(); // do I really need this? just to avoid "Toolkit not initialized"

    public static void main(String[] args) throws InterruptedException { 

        //launch(args); 
        compile();
        System.out.println("stop");
    }

    public static void compile() throws InterruptedException {
        Thread t = new Thread() {
            @Override
            public void run() {
                new Render().start(new Stage()); //EDIT: copy/paste mistake
            }
        };

        Platform.runLater(t);
        t.join(); // never get here!
    }

    public void start(final Stage primaryStage) {
        final WebView webView = new WebView();
        final WebEngine engine = webView.getEngine();
        //final WebEngine engine = new WebEngine();

        //engine.documentProperty().addListener( new ChangeListener<Document>() { @Override public void changed(ObservableValue<? extends Document> prop, Document oldDoc, Document newDoc) {
        engine.getLoadWorker().stateProperty().addListener(new ChangeListener<Worker.State>() { 
            public void changed(ObservableValue ov, Worker.State oldState, Worker.State newState) {
                if (newState == Worker.State.SUCCEEDED) {
                    System.out.println(DomUtils.getDocumentString(engine.getDocument()));

                    primaryStage.close();
                    //Platform.setImplicitExit(true);

                    Platform.exit();  // platform will not exit ... it will exit if I use Application.launch(), but throws an error: java.lang.IllegalStateException: Attempt to call defer when toolkit not running
                    System.out.println("after exit");
                } 
            }
        });

        engine.load("file:///myD3.html");
        System.out.println("after load");
    }
}

Can someone help me getting a static function just call the webengine and return the dom.

EDIT: Even a Thread.currentThread().getThreadGroup().interrupt(); will not stop the Application from running only a System.exit(1) does, but I do not want to shutdown JVM.