搜索
搜索

使用JavaFX在Eclipse中执行“ Hello Word”程序时出错

guiguie34 发表于 Java
36
guiguie34 :

我尝试执行以下代码时遇到问题： 

package application;

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

public class Main extends Application {

    @Override
    public void start(Stage primaryStage) throws Exception{
        Parent root = FXMLLoader.load(getClass().getResource("hellofx.fxml"));
        primaryStage.setTitle("Hello World");
        primaryStage.setScene(new Scene(root, 400, 300));
        primaryStage.show();
    }


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

我收到以下错误： 

Exception in Application start method
java.lang.reflect.InvocationTargetException
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.base/java.lang.reflect.Method.invoke(Method.java:567)
    at javafx.graphics/com.sun.javafx.application.LauncherImpl.launchApplicationWithArgs(LauncherImpl.java:464)
    at javafx.graphics/com.sun.javafx.application.LauncherImpl.launchApplication(LauncherImpl.java:363)
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.base/java.lang.reflect.Method.invoke(Method.java:567)
    at java.base/sun.launcher.LauncherHelper$FXHelper.main(LauncherHelper.java:1051)
Caused by: java.lang.RuntimeException: Exception in Application start method
    at javafx.graphics/com.sun.javafx.application.LauncherImpl.launchApplication1(LauncherImpl.java:900)
    at javafx.graphics/com.sun.javafx.application.LauncherImpl.lambda$launchApplication$2(LauncherImpl.java:195)
    at java.base/java.lang.Thread.run(Thread.java:830)
Caused by: java.lang.NullPointerException: Location is required.
    at javafx.fxml/javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3230)
    at javafx.fxml/javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3194)
    at javafx.fxml/javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3163)
    at javafx.fxml/javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3136)
    at javafx.fxml/javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3113)
    at javafx.fxml/javafx.fxml.FXMLLoader.load(FXMLLoader.java:3106)
    at application.Main.start(Main.java:13)
    at javafx.graphics/com.sun.javafx.application.LauncherImpl.lambda$launchApplication1$9(LauncherImpl.java:846)
    at javafx.graphics/com.sun.javafx.application.PlatformImpl.lambda$runAndWait$12(PlatformImpl.java:455)
    at javafx.graphics/com.sun.javafx.application.PlatformImpl.lambda$runLater$10(PlatformImpl.java:428)
    at java.base/java.security.AccessController.doPrivileged(AccessController.java:391)
    at javafx.graphics/com.sun.javafx.application.PlatformImpl.lambda$runLater$11(PlatformImpl.java:427)
    at javafx.graphics/com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:96)
    at javafx.graphics/com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
    at javafx.graphics/com.sun.glass.ui.win.WinApplication.lambda$runLoop$3(WinApplication.java:174)
    ... 1 more
Exception running application application.Main

我目前在Eclipse 2019-12上，使用JDK 13.0.1和JavaFX13，我已按照本教程https://openjfx.io/openjfx-docs/#install-javafx（JavaFX和Eclipse Part）进行操作，但是它不起作用。因此，如果您能帮助我，我将非常高兴:)谢谢

创建“ hellofx.fxml”和Controller.java之后的新错误： 

Exception in Application start method
java.lang.reflect.InvocationTargetException
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.base/java.lang.reflect.Method.invoke(Method.java:567)
    at javafx.graphics/com.sun.javafx.application.LauncherImpl.launchApplicationWithArgs(LauncherImpl.java:464)
    at javafx.graphics/com.sun.javafx.application.LauncherImpl.launchApplication(LauncherImpl.java:363)
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.base/java.lang.reflect.Method.invoke(Method.java:567)
    at java.base/sun.launcher.LauncherHelper$FXHelper.main(LauncherHelper.java:1051)
Caused by: java.lang.RuntimeException: Exception in Application start method
    at javafx.graphics/com.sun.javafx.application.LauncherImpl.launchApplication1(LauncherImpl.java:900)
    at javafx.graphics/com.sun.javafx.application.LauncherImpl.lambda$launchApplication$2(LauncherImpl.java:195)
    at java.base/java.lang.Thread.run(Thread.java:830)
Caused by: javafx.fxml.LoadException: 
/C:/Users/guill/eclipse-workspace/hello/bin/application/hellofx.fxml

    at javafx.fxml/javafx.fxml.FXMLLoader.constructLoadException(FXMLLoader.java:2625)
    at javafx.fxml/javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:2568)
    at javafx.fxml/javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:2466)
    at javafx.fxml/javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3237)
    at javafx.fxml/javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3194)
    at javafx.fxml/javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3163)
    at javafx.fxml/javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3136)
    at javafx.fxml/javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3113)
    at javafx.fxml/javafx.fxml.FXMLLoader.load(FXMLLoader.java:3106)
    at application.Main.start(Main.java:13)
    at javafx.graphics/com.sun.javafx.application.LauncherImpl.lambda$launchApplication1$9(LauncherImpl.java:846)
    at javafx.graphics/com.sun.javafx.application.PlatformImpl.lambda$runAndWait$12(PlatformImpl.java:455)
    at javafx.graphics/com.sun.javafx.application.PlatformImpl.lambda$runLater$10(PlatformImpl.java:428)
    at java.base/java.security.AccessController.doPrivileged(AccessController.java:391)
    at javafx.graphics/com.sun.javafx.application.PlatformImpl.lambda$runLater$11(PlatformImpl.java:427)
    at javafx.graphics/com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:96)
    at javafx.graphics/com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
    at javafx.graphics/com.sun.glass.ui.win.WinApplication.lambda$runLoop$3(WinApplication.java:174)
    ... 1 more
Caused by: javax.xml.stream.XMLStreamException: ParseError at [row,col]:[2,6]
Message: The processing instruction target matching "[xX][mM][lL]" is not allowed.
    at java.xml/com.sun.org.apache.xerces.internal.impl.XMLStreamReaderImpl.next(XMLStreamReaderImpl.java:652)
    at java.xml/javax.xml.stream.util.StreamReaderDelegate.next(StreamReaderDelegate.java:84)
    at javafx.fxml/javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:2538)
    ... 17 more
Exception running application application.Main

.fxml文件： 

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

<?import javafx.scene.control.Label?>
<?import javafx.scene.layout.StackPane?>


<StackPane maxHeight="-Infinity" maxWidth="-Infinity" minHeight="-Infinity" minWidth="-Infinity" prefHeight="400.0" prefWidth="600.0" xmlns="http://javafx.com/javafx/8" xmlns:fx="http://javafx.com/fxml/1" fx:controller="hellofx.Controller">
    <children>
        <Label fx:id="label" text="Label" />
    </children>
</StackPane>

controller.java文件： 

package application;

import javafx.fxml.FXML;
import javafx.scene.control.Label;

public class controller {

    @FXML
    private Label label;

    public void initialize() {
        String javaVersion = System.getProperty("java.version");
        String javafxVersion = System.getProperty("javafx.version");
        label.setText("Hello, JavaFX " + javafxVersion + "\nRunning on Java " + javaVersion + ".");
    }
}

删除.fxml文件中的空行后，更改程序包名称：

Exception in Application start method
java.lang.reflect.InvocationTargetException
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.base/java.lang.reflect.Method.invoke(Method.java:567)
    at javafx.graphics/com.sun.javafx.application.LauncherImpl.launchApplicationWithArgs(LauncherImpl.java:464)
    at javafx.graphics/com.sun.javafx.application.LauncherImpl.launchApplication(LauncherImpl.java:363)
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.base/java.lang.reflect.Method.invoke(Method.java:567)
    at java.base/sun.launcher.LauncherHelper$FXHelper.main(LauncherHelper.java:1051)
Caused by: java.lang.RuntimeException: Exception in Application start method
    at javafx.graphics/com.sun.javafx.application.LauncherImpl.launchApplication1(LauncherImpl.java:900)
    at javafx.graphics/com.sun.javafx.application.LauncherImpl.lambda$launchApplication$2(LauncherImpl.java:195)
    at java.base/java.lang.Thread.run(Thread.java:830)
Caused by: javafx.fxml.LoadException: 
/C:/Users/guill/eclipse-workspace/hello/bin/application/hellofx.fxml

    at javafx.fxml/javafx.fxml.FXMLLoader.constructLoadException(FXMLLoader.java:2625)
    at javafx.fxml/javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:2568)
    at javafx.fxml/javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:2466)
    at javafx.fxml/javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3237)
    at javafx.fxml/javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3194)
    at javafx.fxml/javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3163)
    at javafx.fxml/javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3136)
    at javafx.fxml/javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3113)
    at javafx.fxml/javafx.fxml.FXMLLoader.load(FXMLLoader.java:3106)
    at application.Main.start(Main.java:13)
    at javafx.graphics/com.sun.javafx.application.LauncherImpl.lambda$launchApplication1$9(LauncherImpl.java:846)
    at javafx.graphics/com.sun.javafx.application.PlatformImpl.lambda$runAndWait$12(PlatformImpl.java:455)
    at javafx.graphics/com.sun.javafx.application.PlatformImpl.lambda$runLater$10(PlatformImpl.java:428)
    at java.base/java.security.AccessController.doPrivileged(AccessController.java:391)
    at javafx.graphics/com.sun.javafx.application.PlatformImpl.lambda$runLater$11(PlatformImpl.java:427)
    at javafx.graphics/com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:96)
    at javafx.graphics/com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
    at javafx.graphics/com.sun.glass.ui.win.WinApplication.lambda$runLoop$3(WinApplication.java:174)
    ... 1 more
Caused by: javax.xml.stream.XMLStreamException: ParseError at [row,col]:[2,6]
Message: The processing instruction target matching "[xX][mM][lL]" is not allowed.
    at java.xml/com.sun.org.apache.xerces.internal.impl.XMLStreamReaderImpl.next(XMLStreamReaderImpl.java:652)
    at java.xml/javax.xml.stream.util.StreamReaderDelegate.next(StreamReaderDelegate.java:84)
    at javafx.fxml/javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:2538)
    ... 17 more
Exception running application application.Main

最终程序运行（我只需要在运行配置中更改VM参数）

阿列克谢·乌沙洛夫斯基（Alexey Usharovski）：

错误的原因是hellofx.fxml您的源文件中没有文件。这就是为什么您要使用NPE。呼叫getClass().getResource("hellofx.fxml")尝试读取不存在的文件并返回null。

该文件包含您要在JavaFX应用程序中拥有的UI的结构。

尝试看一下本教程，以了解如何制作此文件https://docs.oracle.com/javafx/2/get_started/fxml_tutorial.htm

本文收集自互联网，转载请注明来源。

如有侵权，请联系 [email protected] 删除。

编辑于
0

我来说两句

0 条评论
登录 后参与评论

相关文章

使用 spacemacs 和 clojure 运行 Hello World 应用程序时出错

编译“Hello World”程序时出错

启动javaFX程序时出错

执行以下程序时出错

在Java中为AWS Lambda执行“ Hello World”时出错

在g ++ ubuntu中编译简单的hello world c ++程序时出现多个错误

使用RXTX运行程序时出错

在webpack中使用加载程序时出错

googlemock 在使用模拟构建程序时出错

Windows/C++/HelloWorld 中的 Eclipse - 启动过程出错。无法运行程序“ C：.. \ Hello World \ src \ Hello World.cpp”：启动失败

无法在 Ubuntu 12.04 中打开 Eclipse（启动程序时出错）

使用 javac 在终端中编译 Java 程序时出错

Nasm x86-64中的Hello World程序连续打印Hello World

Javafx Spring Boot-运行应用程序时出错

执行spring应用程序时“启动ApplicationContext时出错”

为什么我在执行 pl/sql 程序时出错？

从命令行执行包的java程序时出错

执行程序时出错 PLS-00103

验证Hello.js中的访问令牌时出错

在Eclipse上启动Java应用程序时出错

无法编译 Swift 的 hello word 程序

无法在Eclipse中执行初始的Android Wear Hello World应用

在AWS的Claudiajs Hello Word示例中未加载凭据

什么是hello程序？

Strace Hello World程序

扩展的Hello World程序

运行Hello World程序时出现SimpleCV IOError

在Yii2中打开应用程序时出错

在petalinux中编译gstreamer应用程序时出错

TOP 榜单

  1. 1

    蓝屏死机没有修复解决方案

  2. 2

    计算数据帧中每行的NA

  3. 3

    UITableView的项目向下滚动后更改颜色，然后快速备份

  4. 4

    Node.js中未捕获的异常错误，发生调用

  5. 5

    在 Python 2.7 中。如何从文件中读取特定文本并分配给变量

  6. 6

    Linux的官方Adobe Flash存储库是否已过时？

  7. 7

    验证REST API参数

  8. 8

    ggplot：对齐多个分面图-所有大小不同的分面

  9. 9

    Mac OS X更新后的GRUB 2问题

  10. 10

    通过 Git 在运行 Jenkins 作业时获取 ClassNotFoundException

  11. 11

    带有错误“ where”条件的查询如何返回结果？

  12. 12

    用日期数据透视表和日期顺序查询

  13. 13

    VB.net将2条特定行导出到DataGridView

  14. 14

    如何从视图一次更新多行（ASP.NET - Core）

  15. 15

    Java Eclipse中的错误13，如何解决？

  16. 16

    尝试反复更改屏幕上按钮的位置 - kotlin android studio

  17. 17

    离子动态工具栏背景色

  18. 18

    应用发明者仅从列表中选择一个随机项一次

  19. 19

    当我尝试下载 StanfordNLP en 模型时，出现错误

  20. 20

    python中的boto3文件上传

  21. 21

    在同一Pushwoosh应用程序上Pushwoosh多个捆绑ID

热门标签

归档