客户端/服务器罐-线程"main"java.lang.reflect.InvocationTargetExctive中的异常

Question

我在eclipse中有一个javafx项目准备运行。我有一个客户端和一个服务器。我试图在eclipse中运行服务器和客户端，一切都很好，但是当我导出到可运行的jars时，一个到服务器，一个到客户端，服务器jar工作正常，但是客户端抛出异常：线程“main”中的异常java.lang.reflect.InvocationTargetExctive

虽然它在eclipse中导出之前工作正常。服务器和客户端都是以图形用户界面开始的javafx应用程序。

ClientLauncher。爪哇：

package client;

import javafx.application.Application;
import javafx.event.EventHandler;
import javafx.fxml.FXMLLoader;
import javafx.scene.Parent;
import javafx.scene.Scene;
import javafx.scene.input.MouseEvent;
import javafx.stage.Stage;

public class ClientLauncher extends Application {

    public GCMClient gcmClient;

    private String host = "localhost";
    private int port = 5555;

    private double xOffset = 0;
    private double yOffset = 0;

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

    }

    @Override
    public void start(Stage PrimaryStage) throws Exception {

        System.out.println("Client Connection Established");
        Parent root = FXMLLoader.load(getClass().getResource("/sources/ServerLogin.fxml"));
        root.setOnMousePressed(new EventHandler<MouseEvent>() {

            public void handle(MouseEvent event) {
                xOffset = event.getSceneX();
                yOffset = event.getSceneY();
            }
        });
        root.setOnMouseDragged(new EventHandler<MouseEvent>() {
            @Override
            public void handle(MouseEvent event) {
                PrimaryStage.setX(event.getScreenX() - xOffset);
                PrimaryStage.setY(event.getScreenY() - yOffset);
            }
        });

        Scene scene = new Scene(root);
        PrimaryStage.setScene(scene);
        PrimaryStage.show();
    }

}

我得到的例外是：

Exception in thread "main" java.lang.reflect.InvocationTargetException
        at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
        at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
        at java.base/java.lang.reflect.Method.invoke(Unknown Source)
        at org.eclipse.jdt.internal.jarinjarloader.JarRsrcLoader.main(JarRsrcLoader.java:58)
Caused by: java.lang.RuntimeException: Exception in Application start method
        at javafx.graphics/com.sun.javafx.application.LauncherImpl.launchApplication1(Unknown Source)
        at javafx.graphics/com.sun.javafx.application.LauncherImpl.lambda$launchApplication$2(Unknown Source)
        at java.base/java.lang.Thread.run(Unknown Source)
Caused by: java.lang.NullPointerException: Location is required.
        at javafx.fxml/javafx.fxml.FXMLLoader.loadImpl(Unknown Source)
        at javafx.fxml/javafx.fxml.FXMLLoader.loadImpl(Unknown Source)
        at javafx.fxml/javafx.fxml.FXMLLoader.loadImpl(Unknown Source)
        at javafx.fxml/javafx.fxml.FXMLLoader.loadImpl(Unknown Source)
        at javafx.fxml/javafx.fxml.FXMLLoader.loadImpl(Unknown Source)
        at javafx.fxml/javafx.fxml.FXMLLoader.load(Unknown Source)
        at client.ClientLauncher.start(ClientLauncher.java:33)
        at javafx.graphics/com.sun.javafx.application.LauncherImpl.lambda$launchApplication1$9(Unknown Source)
        at javafx.graphics/com.sun.javafx.application.PlatformImpl.lambda$runAndWait$11(Unknown Source)
        at javafx.graphics/com.sun.javafx.application.PlatformImpl.lambda$runLater$9(Unknown Source)
        at java.base/java.security.AccessController.doPrivileged(Native Method)
        at javafx.graphics/com.sun.javafx.application.PlatformImpl.lambda$runLater$10(Unknown Source)
        at javafx.graphics/com.sun.glass.ui.InvokeLaterDispatcher$Future.run(Unknown Source)
        at javafx.graphics/com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
        at javafx.graphics/com.sun.glass.ui.win.WinApplication.lambda$runLoop$3(Unknown Source)

Answer 1

解决了的：

我拼错了ServerLogin。fxml输入

 Parent root = FXMLLoader.load(getClass().getResource("/sources/ServerLogin.fxml"));

在我的例子中，它被命名为“ServerLogIn.fxml”。

在runnable jar中，fxml的名称似乎是区分大小写的，但在eclipse中不是。这就是为什么它在eclipse中运行良好，而在jar中不起作用。