Application start方法中的异常

我是javafx的新手，我正试图制作一个gui，当点击一个按钮时，它会转到另一个窗口 . 我尝试阅读Stack Overflow上的许多答案 . 我甚至尝试从一开始就重新制作项目......但我继续得到同样的错误 .

那就是异常是Application start方法java.lang.reflect.InvocationTargetException javafx

我的主要

import javafx.application.Application;
import javafx.fxml.FXMLLoader;
import javafx.scene.Parent;
import javafx.scene.Scene;
import javafx.stage.Stage;
import javafx.stage.StageStyle;

public class SkyTravelsFx extends Application {

    @Override
    public void start(Stage stage) throws Exception {
        Parent root = FXMLLoader.load(getClass().getResource("Login.fxml"));
        stage.initStyle(StageStyle.UNDECORATED);

        Scene scene = new Scene(root);

        stage.setScene(scene);
        stage.show();
    }

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

}

LoginController.java

package skytravelsfx;

import java.net.URL;
import java.util.ResourceBundle;
import javafx.event.ActionEvent;
import javafx.fxml.FXML;
import javafx.fxml.FXMLLoader;
import javafx.fxml.Initializable;
import javafx.scene.Parent;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.control.Label;
import javafx.scene.control.TextField;
import javafx.stage.Stage;
import javafx.stage.StageStyle;

public class LoginController implements Initializable {

    @FXML
    TextField username;

    @FXML
    TextField password;

    @FXML
    Button user;

    @FXML
    Button admin;

    @FXML
    Button login;

    @FXML
    public void btnClicked (ActionEvent actionEvent){
        try{
            FXMLLoader fxmlLoader = new FXMLLoader(getClass().getResource("User.fxml"));
            Parent root=(Parent) fxmlLoader.load();
            Stage stage = new Stage();
            Scene scene = new Scene(root);
            stage.setScene(scene);
            stage.initStyle(StageStyle.UNDECORATED);
            stage.show();
           ((Stage)(((Button)actionEvent.getSource()).getScene().getWindow())).hide();
        }catch(Exception e){
            e.printStackTrace();
        }
    }

    @Override
    public void initialize(URL location, ResourceBundle resources) {
        throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates.
    }
}

请注意，我还没有在UserController.java中编写任何代码我刚刚为User.fxml创建了ui

Login.fxml

<?xml version="1.0" encoding="UTF-8"?>

<?import javafx.scene.image.*?>
<?import javafx.scene.shape.*?>
<?import javafx.scene.text.*?>
<?import java.lang.*?>
<?import java.util.*?>
<?import javafx.scene.*?>
<?import javafx.scene.control.*?>
<?import javafx.scene.layout.*?>

<AnchorPane id="AnchorPane" prefHeight="766.0" prefWidth="1366.0" xmlns:fx="http://javafx.com/fxml/1" xmlns="http://javafx.com/javafx/8" fx:controller="skytravelsfx.LoginController">
    <children>
      <ImageView fitHeight="866.0" fitWidth="1397.0" layoutX="10.0" layoutY="11.0" pickOnBounds="true" preserveRatio="true">
         <image>
            <Image url="@../../../SkyTravelFx/src/goodwp.com_25168.jpg" />
         </image>
      </ImageView>
        <Label fx:id="label" layoutX="126" layoutY="120" minHeight="16" minWidth="69" />
      <Label fx:id="label1" layoutX="565.0" layoutY="517.0" minHeight="16" minWidth="69" text="Select User">
         <font>
            <Font size="18.0" />
         </font>
      </Label>
      <Rectangle arcHeight="5.0" arcWidth="5.0" fill="#095a77" height="140.0" stroke="BLACK" strokeType="INSIDE" strokeWidth="0.0" width="1386.0" />
      <Label fx:id="label11" layoutX="56.0" layoutY="33.0" minHeight="16" minWidth="69" text="Sky Travels" textFill="WHITE">
         <font>
            <Font name="System Italic" size="72.0" />
         </font>
      </Label>
      <Label fx:id="label12" layoutX="432.0" layoutY="91.0" minHeight="16" minWidth="69" text="Making your destination closer..." textFill="WHITE">
         <font>
            <Font name="System Italic" size="18.0" />
         </font>
      </Label>
      <AnchorPane layoutX="83.0" layoutY="252.0" prefHeight="507.0" prefWidth="383.0">
         <children>
            <ImageView fitHeight="191.0" fitWidth="234.0" layoutX="96.0" layoutY="6.0" pickOnBounds="true" preserveRatio="true">
               <image>
                  <Image url="@../../../SkyTravelFx/src/icon-default-profile.png" />
               </image>
            </ImageView>
              <Button fx:id="login" layoutX="153.0" layoutY="440.0" onAction="#handleButtonAction" style="-fx-background-color: #095a77;" text="Log In" textFill="WHITE">
               <font>
                  <Font size="18.0" />
               </font>
            </Button>
            <Label fx:id="label2" layoutX="152.0" layoutY="308.0" minHeight="16" minWidth="69" text="Password">
               <font>
                  <Font size="18.0" />
               </font>
            </Label>
            <Label fx:id="label2" layoutX="150.0" layoutY="214.0" minHeight="16" minWidth="69" text="Username">
               <font>
                  <Font size="18.0" />
               </font>
            </Label>
            <TextField fx:id="username" layoutX="115.0" layoutY="241.0" />
            <TextField fx:id="password" layoutX="115.0" layoutY="335.0" />
         </children>
      </AnchorPane>
      <Button fx:id="admin" layoutX="621.0" layoutY="592.0" mnemonicParsing="false" style="-fx-background-color: #095a77;" text="Log In as Admin" textFill="WHITE">
         <font>
            <Font size="18.0" />
         </font>
      </Button>
      <Button fx:id="user" layoutX="621.0" layoutY="675.0" mnemonicParsing="false" onAction="#btnClicked" prefHeight="39.0" prefWidth="153.0" style="-fx-background-color: #095a77;" text="Log In as User" textFill="WHITE">
         <font>
            <Font size="18.0" />
         </font>
      </Button>
    </children>
</AnchorPane>

这是我得到的运行时错误 .

sun.reflect.DelegatingMethodAccessorImpl.invoke（NativeMethodAccessorImpl.invoke：62）at sun.reflect.DelegatingMethodAccessorImpl.invoke（DelegatingMethodAccessorImpl）的sun.reflect.NativeMethodAccessorImpl.invoke0（本地方法）中的应用程序启动方法java.lang.reflect.InvocationTargetException异常.java：43）at java.lang.reflect.Method.invoke（Method.java:498）at com.sun.javafx.application.LauncherImpl.launchApplicationWithArgs（LauncherImpl.java:389）at com.sun.javafx.application . LauncherImpl.launchApplication（LauncherImpl.java:328）at sun.reflect.NativeMethodAccessorImpl.invoke0（Native Method）at sun.reflect.NativeMethodAccessorImpl.invoke（NativeMethodAccessorImpl.java:62）at sun.reflect.DelegatingMethodAccessorImpl.invoke（DelegatingMethodAccessorImpl.java： 43）在sun.launcher.LauncherHelper的java.lang.reflect.Method.invoke（Method.java:498）中 . $ FXHelper.main（LauncherHelper.java:767）引起：java.lang.RuntimeException：Application start方法中的异常在com.sun.javafx.appli cation.LauncherImpl.launchApplication1（LauncherImpl.java:917）在com.sun.javafx.application.LauncherImpl.lambda $ launchApplication $ 155（LauncherImpl.java:182）在java.lang.Thread.run（Thread.java:745）引起的by：javafx.fxml.LoadException：解析onAction ='＃handleButtonAction'时出错，要么事件处理程序不在命名空间中，要么脚本中有错误 . 文件：/ C：/Users/Dell/Documents/NetBeansProjects/SkyTravelsFx/dist/run1245920268/SkyTravelsFx.jar /skytravelsfx/Login.fxml：47在javafx.fxml.FXMLLoader.constructLoadException（FXMLLoader.java:2597）在JavaFX的 . fxml.FXMLLoader.access $ 100（FXMLLoader.java:103）位于javafx的javafx.fxml.FXMLLoader $ Element.processEventHandlerAttributes（FXMLLoader.java:610）javafx.fxml.FXMLLoader $ ValueElement.processEndElement（FXMLLoader.java:770） . fxml.FXMLLoader.processEndElement（FXMLLoader.java:2823）位于javafx.fxml.FXMLLoader.loadImpl（FXMLLoader.java:2532）的javafx.fxml.FXMLLoader.loadImpl（FXMLLoader.java:2441）javafx.fxml.FXMLLoader.loadImpl （FXMLLoader.java:3214）在javafx.fxml.FXMLLoader.loadImpl（FXMLLoader.java:3175）在javafx.fxml.FXMLLoader.loadImpl（FXMLLoader.java:3148）在javafx.fxml.FXMLLoader.loadImpl（FXMLLoader.java： 3124）在javafx.fxml.FXMLLoader.loadImpl（FXMLLoader.java:3104）在javafx.fxml.FXMLLoader.load（FXMLLoader.java:3097）在skytravelsfx.SkyTravelsFx.start（SkyTravelsFx.java:23）在com.su n.javafx.application.LauncherImpl.lambda $ launchApplication1 $ 162（LauncherImpl.java:863）在com.sun.javafx.application.PlatformImpl.lambda $ runAndWait $ 175（PlatformImpl.java:326）在com.sun.javafx.application . PlatformImpl.lambda $ null $ 173（PlatformImpl.java:295）位于com.sun.javafx.application.PlatformImpl.lambda的java.security.AccessController.doPrivileged（Native Method）$ runLater $ 174（PlatformImpl.java:294） . sun.glass.ui.InvokeLaterDispatcher $ Future.run（InvokeLaterDispatcher.java:95）at com.sun.glass.ui.win.WinApplication._runLoop（Native Method）at com.sun.glass.ui.win.WinApplication.lambda为$ null $ 148（WinApplication.java:191）... 1层更多的异常运行的应用程序的Java skytravelsfx.SkyTravelsFx结果：1个删除目录C：\用户\ DELL \文档\的NetBeansProjects \ SkyTravelsFx \ DIST \ run1245920268 jfxsa运行：BUILD SUCCESSFUL（总时间：4秒）