public class Kuku extends Application {
    @Override
    public void start(Stage primaryStage) throws Exception {
        Thread.setDefaultUncaughtExceptionHandler(new Thread.UncaughtExceptionHandler() {

            @Override
            public void uncaughtException(Thread thread, Throwable t) {
                StringWriter sw = new StringWriter();
                PrintWriter pw = new PrintWriter(sw);
                t.printStackTrace(pw);
               // sw.toString();

                System.out.println("There was an exception. " + t.getMessage());
                System.out.println("There was an exception. " + sw.toString());

            }

        });