javafx无法生成textfield区域，报错，报错和代码见下

Question

java.lang.reflect.InvocationTargetException

package example;

import javafx.application.Application;
import javafx.scene.Scene;
import javafx.scene.control.Label;
import javafx.scene.control.TextField;
import javafx.scene.layout.HBox;
import javafx.stage.Stage;

public class b extends Application {

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

@Override
public void start(Stage primaryStage) {
    primaryStage.setTitle("example");

    Label l = new Label("请选择第1题的答案：");

    TextField textField = new TextField ();
    HBox hb = new HBox();
    hb.getChildren().addAll(l, textField);
    hb.setSpacing(100);
    Scene s = new Scene(l,200,100);
    primaryStage.show();
    primaryStage.setScene(s);
}



}

Answer 1

报的错误是反射调用方法的错误，估计是缺少jar包或者配置的问题，没找到控件之类。