我在Scene Builder中生成了FXML：
<?xml version="1.0" encoding="UTF-8"?>
<?scenebuilder-preview-i18n-resource ../lang/ru_RU.properties?>
<?import javafx.scene.control.*?>
<?import javafx.scene.layout.*?>
<AnchorPane id="AnchorPane" fx:id="mainStagePane" xmlns="http://javafx.com/javafx/8" xmlns:fx="http://javafx.com/fxml/1" fx:controller="UI.MainStageController">
<children>
<SplitPane dividerPositions="0.6596244131455399" focusTraversable="true" prefHeight="-1.0" prefWidth="1280.0" AnchorPane.bottomAnchor="30.0" AnchorPane.leftAnchor="0.0" AnchorPane.rightAnchor="0.0" AnchorPane.topAnchor="160.0">
<items>
<AnchorPane id="rootPane" fx:id="pane3d" prefHeight="930.0" prefWidth="1280.0" />
<AnchorPane minHeight="0.0" minWidth="0.0" prefHeight="160.0" prefWidth="100.0">
<children>
<Accordion id="accordeon" fx:id="accordion" AnchorPane.bottomAnchor="0.0" AnchorPane.leftAnchor="0.0" AnchorPane.rightAnchor="0.0" AnchorPane.topAnchor="0.0">
<panes>
<TitledPane animated="true" text="%3dSceneSettings" fx:id="x2">
<content>
<AnchorPane id="Content" minHeight="0.0" minWidth="0.0" prefHeight="180.0" prefWidth="200.0">
<children>
<Slider fx:id="farClipSlider" layoutY="50.0" majorTickUnit="10.0" max="100.0" min="-100.0" minorTickCount="1" prefWidth="337.0" showTickLabels="true" showTickMarks="true" AnchorPane.leftAnchor="14.0" AnchorPane.rightAnchor="75.0" />
<TextField layoutY="14.0" prefWidth="55.0" AnchorPane.rightAnchor="217.0" />
<Slider fx:id="distanceSlider" blockIncrement="25.0" layoutX="14.0" layoutY="133.0" majorTickUnit="50.0" max="500.0" min="-500.0" minorTickCount="25" prefWidth="399.0" showTickLabels="true" showTickMarks="true" snapToTicks="true" />
<VBox layoutY="364.0" prefHeight="200.0" prefWidth="100.0" AnchorPane.leftAnchor="14.0" AnchorPane.rightAnchor="14.0">
<children>
<HBox prefHeight="-1.0" prefWidth="-1.0">
<children>
<Label text="Label" />
<TextField prefWidth="55.0" />
</children>
</HBox>
<Slider fx:id="nearClipSlider" blockIncrement="1.0" majorTickUnit="10.0" max="100.0" min="-100.0" minorTickCount="1" prefWidth="338.0" showTickLabels="true" showTickMarks="true" snapToTicks="true" value="0.0" />
</children>
</VBox>
<Label layoutX="104.0" layoutY="17.0" text="Label" />
</children>
</AnchorPane>
</content>
</TitledPane>
<TitledPane animated="true" expanded="false" text="%3dModelSettings" fx:id="x1">
<content>
<AnchorPane id="Content" minHeight="0.0" minWidth="0.0" prefHeight="180.0" prefWidth="200.0" />
</content>
</TitledPane>
</panes>
</Accordion>
</children>
</AnchorPane>
</items>
</SplitPane>
<ToolBar maxHeight="30.0" minHeight="30.0" prefHeight="30.0" AnchorPane.bottomAnchor="0.0" AnchorPane.leftAnchor="0.0" AnchorPane.rightAnchor="0.0">
<items>
<ProgressBar fx:id="loadProgressBar" disable="false" prefWidth="200.0" progress="0.0" visible="true" />
</items>
</ToolBar>
<TabPane prefHeight="160.0" prefWidth="200.0" tabClosingPolicy="UNAVAILABLE" AnchorPane.leftAnchor="0.0" AnchorPane.rightAnchor="0.0" AnchorPane.topAnchor="0.0">
<tabs>
<Tab text="%file">
<content>
<AnchorPane id="Content" minHeight="0.0" minWidth="0.0" prefHeight="180.0" prefWidth="200.0">
<children>
<Button alignment="CENTER" graphicTextGap="4.0" mnemonicParsing="false" prefHeight="90.0" prefWidth="90.0" text="%openFile" textAlignment="CENTER" textOverrun="ELLIPSIS" underline="false" wrapText="true" AnchorPane.leftAnchor="14.0" AnchorPane.topAnchor="14.0" />
<Separator layoutX="170.0" orientation="VERTICAL" prefHeight="200.0" AnchorPane.bottomAnchor="10.0" AnchorPane.topAnchor="10.0" />
</children>
</AnchorPane>
</content>
</Tab>
<Tab text="%analysis">
<content>
<AnchorPane id="Content" minHeight="0.0" minWidth="0.0" prefHeight="180.0" prefWidth="200.0">
<children>
<Button mnemonicParsing="false" prefHeight="90.0" prefWidth="90.0" text="Button" AnchorPane.leftAnchor="14.0" AnchorPane.topAnchor="14.0" />
</children>
</AnchorPane>
</content>
</Tab>
</tabs>
</TabPane>
</children>
</AnchorPane>
但突然间我收到了以下异常：
javafx.fxml.LoadException:
/D:/Projects/CastAnalytics/out/production/CastAnalytics/UI/MainStage.fxml
at javafx.fxml.FXMLLoader.constructLoadException(FXMLLoader.java:2592)
at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:2570)
at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:2416)
at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3160)
at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3121)
at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3094)
at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3070)
at javafx.fxml.FXMLLoader.load(FXMLLoader.java:3062)
at core.CastAnalytics.start(CastAnalytics.java:32)
at com.sun.javafx.application.LauncherImpl$8.run(LauncherImpl.java:837)
at com.sun.javafx.application.PlatformImpl$7.run(PlatformImpl.java:331)
at com.sun.javafx.application.PlatformImpl$6$1.run(PlatformImpl.java:297)
at com.sun.javafx.application.PlatformImpl$6$1.run(PlatformImpl.java:294)
at java.security.AccessController.doPrivileged(Native Method)
at com.sun.javafx.application.PlatformImpl$6.run(PlatformImpl.java:294)
at com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:95)
at com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
at com.sun.glass.ui.win.WinApplication.access$300(WinApplication.java:39)
at com.sun.glass.ui.win.WinApplication$4$1.run(WinApplication.java:112)
at java.lang.Thread.run(Thread.java:744)
Caused by: java.lang.NullPointerException
at UI.MainStageController.set(MainStageController.java:98)
at UI.MainStageController.initialize(MainStageController.java:34)
at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:2523)
... 18 more
这是什么意思，我该如何解决？
答案 0 :(得分：0)
嗯，你在MainStageController的第98行有一个空指针....
如果我不得不猜测，我会说你在Controller中定义的@FXML变量之一与FXML文件中的名称不同，所以你得到的是NPE。
您必须粘贴相关的MainStageController.java代码，以便任何人了解更多信息。
答案 1 :(得分：0)
如果可能，请发布违规行或SSCE。我同意jhsheets和你的方法根据你的fx：id名称双重检查变量名称。我在完全相同的地方（在初始化方法中尝试进行一些后加载初始化）遇到了这个确切的错误/情况，其中我的fx中出现了一个小错误：我引起了一个NPE。但是，知道NPE起源的set方法中发生了什么会很好。