JavaFX“需要位置".即使它在同一个包中 [英] JavaFX "Location is required." even though it is in the same package

问题描述

我正在尝试运行我的 JavaFX 程序，但遇到了一些困难.我不断收到java.lang.NullPointerException: Location is required"的错误消息.fxml 文件与 Application 类在同一个包中.这是我的非常简单的代码:

I am trying to get my JavaFX program to run but am having some difficulty. I keep getting an error of 'java.lang.NullPointerException: Location is required.' The fxml file is in the same package as Application class. Here is my very simple code:

package com.kromalights.designer.entry;

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("main.fxml"));
        primaryStage.setTitle("Kromalights Designer");
        primaryStage.setScene(new Scene(root, 300, 275));
        primaryStage.show();
    }


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

这是我的 main.fxml 文件的副本:

And here is a copy of my main.fxml file:

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

<?import java.lang.*?>
<?import javafx.scene.layout.*?>
<?import javafx.scene.layout.BorderPane?>
<?scenebuilder-stylesheet mailStyles.css?>
<?import java.net.*?>

<BorderPane prefHeight="300.0" prefWidth="300.0" xmlns:fx="http://javafx.com/fxml/1"
        xmlns="http://javafx.com/javafx/2.2"
        fx:controller="com.kromalights.designer.entry.Controller">
    <bottom>
        <Pane prefHeight="200.0" prefWidth="200.0"/>
    </bottom>
    <center>
        <Pane prefHeight="200.0" prefWidth="200.0"/>
    </center>
    <left>
        <VBox prefHeight="200.0" prefWidth="100.0"/>
    </left>
    <top>
        <HBox prefHeight="100.0" prefWidth="200.0"/>
    </top>
    <stylesheets>
        <URL value="@mainStyles.css" />
    </stylesheets>
</BorderPane>

控制器类确实存在并且位于 fxml 文件中指定的包中.我所有的名字都是正确的，是我认为应该出现的地方.我错过了什么?我确实尝试重命名我的 fxml 文件，以防它是名称问题.请帮忙.仅供参考，我在 OSX 上使用 Intellij IDEA.

The controller class does exist and is in the package specified in the fxml file. All of my names are correct and are where I think they should be. What am I missing? I did try renaming my fxml file in case it was a name issue. Please help. FYI, I am using Intellij IDEA on OSX.

更新:这是一个 Maven 问题.我为这个项目设置了 Maven，这导致了这个问题.我暂时删除了 Maven，这样我就可以在没有它的情况下继续工作.有没有人知道我在使用 Maven 时如何最好地处理这个问题?

UPDATE: This is a Maven issue. I setup Maven for this project and that caused the issue. I removed Maven temporarily so I can continue working without it. Does anyone have any insight as to how I would best handle this when using Maven?

推荐答案

将文件移动到 main/resources 目录有效.

Moving the file to the main/resources directory worked.

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