经过签名的Javafx jar工作并执行，但是jnlp对Javafx jar的引用找不到对gui.fxml文件的引用

Question

我试图将一个javafx应用程序嵌入到一个项目的网页中。我已经成功导出并执行了这个javafx jar文件。该文件作为可执行jar文件从eclipse导出，然后部署应用程序来创建html、jnlp和我的jar文件的副本。

我签署了我的jar，验证它是签名的，然后打开Chrome中的html文件。javafx应用程序试图加载，但出现了以下错误：

    java.lang.NullPointerException: Location is required.
    at javafx.fxml.FXMLLoader.loadImpl(Unknown Source)
    at javafx.fxml.FXMLLoader.loadImpl(Unknown Source)
    at javafx.fxml.FXMLLoader.loadImpl(Unknown Source)
    at javafx.fxml.FXMLLoader.loadImpl(Unknown Source)
    at javafx.fxml.FXMLLoader.loadImpl(Unknown Source)
    at javafx.fxml.FXMLLoader.load(Unknown Source)
    at application.Main.start(Main.java:19)
    at com.sun.javafx.applet.FXApplet2$2.run(Unknown Source)
    at com.sun.javafx.application.PlatformImpl.lambda$null$170(Unknown Source)
    at com.sun.javafx.application.PlatformImpl$$Lambda$45/5729401.run(Unknown Source)
    at java.security.AccessController.doPrivileged(Native Method)
    at com.sun.javafx.application.PlatformImpl.lambda$runLater$171(Unknown Source)
    at com.sun.javafx.application.PlatformImpl$$Lambda$44/8383735.run(Unknown Source)
    at com.sun.glass.ui.InvokeLaterDispatcher$Future.run(Unknown Source)
    at com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
    at com.sun.glass.ui.win.WinApplication.lambda$null$145(Unknown Source)
    at com.sun.glass.ui.win.WinApplication$$Lambda$34/14272056.run(Unknown Source)
    at java.lang.Thread.run(Unknown Source)
Exception in thread "JavaFX Application Thread" java.lang.RuntimeException: java.lang.NullPointerException: Location is required.
    at com.sun.javafx.applet.FXApplet2$2.run(Unknown Source)
    at com.sun.javafx.application.PlatformImpl.lambda$null$170(Unknown Source)
    at com.sun.javafx.application.PlatformImpl$$Lambda$45/5729401.run(Unknown Source)
    at java.security.AccessController.doPrivileged(Native Method)
    at com.sun.javafx.application.PlatformImpl.lambda$runLater$171(Unknown Source)
    at com.sun.javafx.application.PlatformImpl$$Lambda$44/8383735.run(Unknown Source)
    at com.sun.glass.ui.InvokeLaterDispatcher$Future.run(Unknown Source)
    at com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
    at com.sun.glass.ui.win.WinApplication.lambda$null$145(Unknown Source)
    at com.sun.glass.ui.win.WinApplication$$Lambda$34/14272056.run(Unknown Source)
    at java.lang.Thread.run(Unknown Source)
Caused by: java.lang.NullPointerException: Location is required.
    at javafx.fxml.FXMLLoader.loadImpl(Unknown Source)
    at javafx.fxml.FXMLLoader.loadImpl(Unknown Source)
    at javafx.fxml.FXMLLoader.loadImpl(Unknown Source)
    at javafx.fxml.FXMLLoader.loadImpl(Unknown Source)
    at javafx.fxml.FXMLLoader.loadImpl(Unknown Source)
    at javafx.fxml.FXMLLoader.load(Unknown Source)
    at application.Main.start(Main.java:19)
    ... 11 more
CacheEntry[file:/C:/Users/tso5912/Desktop/WebDriverEmbed/webDriverDeploy/webdriverjar2.jar]: updateAvailable=true,lastModified=Fri May 22 10:21:49 CDT 2015,length=107020288

Main.java:19在代码的主应用程序中指定了这一行：

package application;

import java.io.IOException;

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)
    {
        Parent root;
        try
        {
            root = FXMLLoader.load(this.getClass().getResource("Gui.fxml"));
        }
        catch (IOException e)
        {
            e.printStackTrace();
            return;
        }

        Scene scene = new Scene(root);
        scene.getStylesheets().add(this.getClass().getResource("application.css").toExternalForm());
        primaryStage.setScene(scene);
        primaryStage.sizeToScene();
        primaryStage.show();
        primaryStage.setResizable(true);
        primaryStage.setTitle("WebDriver");

    }

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

这是我的jnlp文件：

<?xml version="1.0" encoding="utf-8"?>
<jnlp spec="1.0" xmlns:jfx="http://javafx.com" href="WebDriver.jnlp">
  <information>
    <title>Sample JavaFX Application</title>
    <vendor>Unknown vendor</vendor>
    <description>Sample JavaFX 2.0 application.</description>
    <offline-allowed/>
  </information>
  <resources>
    <j2se version="1.6+" href="http://java.sun.com/products/autodl/j2se"/>
    <jar href="webdriverjar.jar" size="31252632" download="eager" />
  </resources>
  <jfx:javafx-desc  width="200" height="200" main-class="application.Main"  name="WebDriver" />
  <update check="background"/>
</jnlp>

任何帮助都很感激。

Answer 1

我相信，您需要密切关注实际的Apache服务器（或类似服务器），以便正确编译JNLP。尝试在服务器上托管该文件，而不是从桌面上运行该文件，看看是否有帮助。