JavaFX：应用程序启动方法异常 java.lang.reflect.InvocationTargetException
JavaFX: Exception in Application Start Method java.lang.reflect.InvocationTargetException
我真的很绝望。
我不知道为什么，但每次我尝试 运行 我的程序时都会出现此错误。
我正在使用带有 Java 10.0.2 的 Netbeans，以便已经安装 JavaFX。
我认为这是由于 FXML 文件的一些问题。
你能帮帮我吗？
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:564)
at javafx.graphics/com.sun.javafx.application.LauncherImpl.launchApplicationWithArgs(LauncherImpl.java:473)
at javafx.graphics/com.sun.javafx.application.LauncherImpl.launchApplication(LauncherImpl.java:372)
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:564)
at java.base/sun.launcher.LauncherHelper$FXHelper.main(LauncherHelper.java:941)
Caused by: java.lang.RuntimeException: Exception in Application start method
at javafx.graphics/com.sun.javafx.application.LauncherImpl.launchApplication1(LauncherImpl.java:973)
at javafx.graphics/com.sun.javafx.application.LauncherImpl.lambda$launchApplication(LauncherImpl.java:198)
at java.base/java.lang.Thread.run(Thread.java:844)
Caused by: javafx.fxml.LoadException: Root hasn't been set. Use method setRoot() before load.
file:/C:/Users/User/Documents/NetBeansProjects/gruppo71/dist/run2124011701/gruppo71.jar!/gruppo71/FXMLDocument.fxml:13
at javafx.fxml/javafx.fxml.FXMLLoader.constructLoadException(FXMLLoader.java:2621)
at javafx.fxml/javafx.fxml.FXMLLoader.access0(FXMLLoader.java:105)
at javafx.fxml/javafx.fxml.FXMLLoader$RootElement.constructValue(FXMLLoader.java:1338)
at javafx.fxml/javafx.fxml.FXMLLoader$ValueElement.processStartElement(FXMLLoader.java:754)
at javafx.fxml/javafx.fxml.FXMLLoader.processStartElement(FXMLLoader.java:2722)
at javafx.fxml/javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:2552)
at javafx.fxml/javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:2466)
at javafx.fxml/javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3253)
at javafx.fxml/javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3210)
at javafx.fxml/javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3179)
at javafx.fxml/javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3152)
at javafx.fxml/javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3129)
at javafx.fxml/javafx.fxml.FXMLLoader.load(FXMLLoader.java:3122)
at gruppo71.Gruppo71.start(Gruppo71.java:21)
at javafx.graphics/com.sun.javafx.application.LauncherImpl.lambda$launchApplication1(LauncherImpl.java:919)
at javafx.graphics/com.sun.javafx.application.PlatformImpl.lambda$runAndWait(PlatformImpl.java:449)
at javafx.graphics/com.sun.javafx.application.PlatformImpl.lambda$runLater(PlatformImpl.java:418)
at java.base/java.security.AccessController.doPrivileged(Native Method)
at javafx.graphics/com.sun.javafx.application.PlatformImpl.lambda$runLater(PlatformImpl.java:417)
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(WinApplication.java:175)
... 1 more
Exception running application gruppo71.Gruppo71
Java Result: 1
我的主要是这个：
import javafx.application.Application;
import javafx.fxml.FXMLLoader;
import javafx.scene.Parent;
import javafx.scene.Scene;
import javafx.stage.Stage;
/**
*
* @author User
*/
public class Gruppo71 extends Application {
@Override
public void start(Stage stage) throws Exception {
Parent root = FXMLLoader.load(getClass().getResource("FXMLDocument.fxml"));
Scene scene = new Scene(root);
stage.setScene(scene);
stage.show();
}
/**
* @param args the command line arguments
*/
public static void main(String[] args) {
launch(args);
}
}
我的 FXML 代码是：
<?import javafx.scene.control.Button?>
<?import javafx.scene.control.ContextMenu?>
<?import javafx.scene.control.DatePicker?>
<?import javafx.scene.control.MenuItem?>
<?import javafx.scene.control.SplitPane?>
<?import javafx.scene.control.TableColumn?>
<?import javafx.scene.control.TableView?>
<?import javafx.scene.control.TextField?>
<?import javafx.scene.layout.AnchorPane?>
<fx:root id="AnchorPane" prefHeight="300.0" prefWidth="450.0" type="AnchorPane" xmlns="http://javafx.com/javafx/10.0.2" xmlns:fx="http://javafx.com/fxml/1" fx:controller="gruppo71.FXMLDocumentController">
<children>
<SplitPane dividerPositions="0.13087248322147652" layoutX="28.0" orientation="VERTICAL" prefHeight="200.0" prefWidth="320.0" AnchorPane.bottomAnchor="0.0" AnchorPane.leftAnchor="0.0" AnchorPane.rightAnchor="0.0" AnchorPane.topAnchor="0.0">
<items>
<AnchorPane minHeight="0.0" minWidth="0.0" prefHeight="100.0" prefWidth="160.0">
<children>
<Button fx:id="aggiungiButton" layoutX="10.0" layoutY="5.0" mnemonicParsing="false" onAction="#addEvento" text="Aggiungi Evento" AnchorPane.bottomAnchor="5.0" AnchorPane.leftAnchor="10.0" AnchorPane.topAnchor="5.0" />
<DatePicker fx:id="dataPicker" layoutX="114.0" layoutY="6.0" prefHeight="26.0" prefWidth="150.0" AnchorPane.bottomAnchor="5.0" AnchorPane.leftAnchor="124.0" AnchorPane.topAnchor="5.0" />
<TextField fx:id="descriptionField" layoutX="285.0" layoutY="6.0" text="aggiungi descrizione..." AnchorPane.bottomAnchor="5.0" AnchorPane.leftAnchor="284.0" AnchorPane.rightAnchor="10.0" AnchorPane.topAnchor="5.0" />
</children>
</AnchorPane>
<AnchorPane minHeight="0.0" minWidth="0.0" prefHeight="100.0" prefWidth="160.0">
<children>
<TableView fx:id="mainTab" layoutX="14.0" prefHeight="256.0" prefWidth="448.0" AnchorPane.bottomAnchor="0.0" AnchorPane.leftAnchor="0.0" AnchorPane.rightAnchor="0.0" AnchorPane.topAnchor="0.0">
<columns>
<TableColumn fx:id="dataColumn" prefWidth="136.0" text="Data" />
<TableColumn fx:id="eventColumn" prefWidth="311.0" text="Evento" />
</columns>
<contextMenu>
<ContextMenu>
<items>
<MenuItem fx:id="removeButton" mnemonicParsing="false" onAction="#removeEvent" text="Rimuovi Evento" />
<MenuItem fx:id="importaButton" mnemonicParsing="false" onAction="#importCSV" text="Importa CSV" />
<MenuItem fx:id="exportButton" mnemonicParsing="false" onAction="#exportCSV" text="Esporta CSV" />
</items>
</ContextMenu>
</contextMenu>
</TableView>
</children>
</AnchorPane>
</items>
</SplitPane>
</children>
</fx:root>
所有帮助将不胜感激！！！
只是为了将此标记为已回答：请参阅@James_D' 评论以获取解决方案。
将 FXML 文件中的 <fx:root> 替换为 <AnchorPane> 或在调用 load() 之前在 FXMLLoader 上设置根目录，例如：
FXMLLoader fxmlLoader = new FXMLLoader(getClass().getResource("FXMLDocument.fxml"));
fxmlLoader.setRoot(new AnchorPane());
Parent root = fxmlLoader.load();
另请参阅：
JavaFx FXML load file issues with setting root
我真的很绝望。 我不知道为什么，但每次我尝试 运行 我的程序时都会出现此错误。 我正在使用带有 Java 10.0.2 的 Netbeans，以便已经安装 JavaFX。 我认为这是由于 FXML 文件的一些问题。 你能帮帮我吗？
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:564)
at javafx.graphics/com.sun.javafx.application.LauncherImpl.launchApplicationWithArgs(LauncherImpl.java:473)
at javafx.graphics/com.sun.javafx.application.LauncherImpl.launchApplication(LauncherImpl.java:372)
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:564)
at java.base/sun.launcher.LauncherHelper$FXHelper.main(LauncherHelper.java:941)
Caused by: java.lang.RuntimeException: Exception in Application start method
at javafx.graphics/com.sun.javafx.application.LauncherImpl.launchApplication1(LauncherImpl.java:973)
at javafx.graphics/com.sun.javafx.application.LauncherImpl.lambda$launchApplication(LauncherImpl.java:198)
at java.base/java.lang.Thread.run(Thread.java:844)
Caused by: javafx.fxml.LoadException: Root hasn't been set. Use method setRoot() before load.
file:/C:/Users/User/Documents/NetBeansProjects/gruppo71/dist/run2124011701/gruppo71.jar!/gruppo71/FXMLDocument.fxml:13
at javafx.fxml/javafx.fxml.FXMLLoader.constructLoadException(FXMLLoader.java:2621)
at javafx.fxml/javafx.fxml.FXMLLoader.access0(FXMLLoader.java:105)
at javafx.fxml/javafx.fxml.FXMLLoader$RootElement.constructValue(FXMLLoader.java:1338)
at javafx.fxml/javafx.fxml.FXMLLoader$ValueElement.processStartElement(FXMLLoader.java:754)
at javafx.fxml/javafx.fxml.FXMLLoader.processStartElement(FXMLLoader.java:2722)
at javafx.fxml/javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:2552)
at javafx.fxml/javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:2466)
at javafx.fxml/javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3253)
at javafx.fxml/javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3210)
at javafx.fxml/javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3179)
at javafx.fxml/javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3152)
at javafx.fxml/javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3129)
at javafx.fxml/javafx.fxml.FXMLLoader.load(FXMLLoader.java:3122)
at gruppo71.Gruppo71.start(Gruppo71.java:21)
at javafx.graphics/com.sun.javafx.application.LauncherImpl.lambda$launchApplication1(LauncherImpl.java:919)
at javafx.graphics/com.sun.javafx.application.PlatformImpl.lambda$runAndWait(PlatformImpl.java:449)
at javafx.graphics/com.sun.javafx.application.PlatformImpl.lambda$runLater(PlatformImpl.java:418)
at java.base/java.security.AccessController.doPrivileged(Native Method)
at javafx.graphics/com.sun.javafx.application.PlatformImpl.lambda$runLater(PlatformImpl.java:417)
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(WinApplication.java:175)
... 1 more
Exception running application gruppo71.Gruppo71
Java Result: 1
我的主要是这个：
import javafx.application.Application;
import javafx.fxml.FXMLLoader;
import javafx.scene.Parent;
import javafx.scene.Scene;
import javafx.stage.Stage;
/**
*
* @author User
*/
public class Gruppo71 extends Application {
@Override
public void start(Stage stage) throws Exception {
Parent root = FXMLLoader.load(getClass().getResource("FXMLDocument.fxml"));
Scene scene = new Scene(root);
stage.setScene(scene);
stage.show();
}
/**
* @param args the command line arguments
*/
public static void main(String[] args) {
launch(args);
}
}
我的 FXML 代码是：
<?import javafx.scene.control.Button?>
<?import javafx.scene.control.ContextMenu?>
<?import javafx.scene.control.DatePicker?>
<?import javafx.scene.control.MenuItem?>
<?import javafx.scene.control.SplitPane?>
<?import javafx.scene.control.TableColumn?>
<?import javafx.scene.control.TableView?>
<?import javafx.scene.control.TextField?>
<?import javafx.scene.layout.AnchorPane?>
<fx:root id="AnchorPane" prefHeight="300.0" prefWidth="450.0" type="AnchorPane" xmlns="http://javafx.com/javafx/10.0.2" xmlns:fx="http://javafx.com/fxml/1" fx:controller="gruppo71.FXMLDocumentController">
<children>
<SplitPane dividerPositions="0.13087248322147652" layoutX="28.0" orientation="VERTICAL" prefHeight="200.0" prefWidth="320.0" AnchorPane.bottomAnchor="0.0" AnchorPane.leftAnchor="0.0" AnchorPane.rightAnchor="0.0" AnchorPane.topAnchor="0.0">
<items>
<AnchorPane minHeight="0.0" minWidth="0.0" prefHeight="100.0" prefWidth="160.0">
<children>
<Button fx:id="aggiungiButton" layoutX="10.0" layoutY="5.0" mnemonicParsing="false" onAction="#addEvento" text="Aggiungi Evento" AnchorPane.bottomAnchor="5.0" AnchorPane.leftAnchor="10.0" AnchorPane.topAnchor="5.0" />
<DatePicker fx:id="dataPicker" layoutX="114.0" layoutY="6.0" prefHeight="26.0" prefWidth="150.0" AnchorPane.bottomAnchor="5.0" AnchorPane.leftAnchor="124.0" AnchorPane.topAnchor="5.0" />
<TextField fx:id="descriptionField" layoutX="285.0" layoutY="6.0" text="aggiungi descrizione..." AnchorPane.bottomAnchor="5.0" AnchorPane.leftAnchor="284.0" AnchorPane.rightAnchor="10.0" AnchorPane.topAnchor="5.0" />
</children>
</AnchorPane>
<AnchorPane minHeight="0.0" minWidth="0.0" prefHeight="100.0" prefWidth="160.0">
<children>
<TableView fx:id="mainTab" layoutX="14.0" prefHeight="256.0" prefWidth="448.0" AnchorPane.bottomAnchor="0.0" AnchorPane.leftAnchor="0.0" AnchorPane.rightAnchor="0.0" AnchorPane.topAnchor="0.0">
<columns>
<TableColumn fx:id="dataColumn" prefWidth="136.0" text="Data" />
<TableColumn fx:id="eventColumn" prefWidth="311.0" text="Evento" />
</columns>
<contextMenu>
<ContextMenu>
<items>
<MenuItem fx:id="removeButton" mnemonicParsing="false" onAction="#removeEvent" text="Rimuovi Evento" />
<MenuItem fx:id="importaButton" mnemonicParsing="false" onAction="#importCSV" text="Importa CSV" />
<MenuItem fx:id="exportButton" mnemonicParsing="false" onAction="#exportCSV" text="Esporta CSV" />
</items>
</ContextMenu>
</contextMenu>
</TableView>
</children>
</AnchorPane>
</items>
</SplitPane>
</children>
</fx:root>
所有帮助将不胜感激！！！
只是为了将此标记为已回答：请参阅@James_D' 评论以获取解决方案。
将 FXML 文件中的 <fx:root> 替换为 <AnchorPane> 或在调用 load() 之前在 FXMLLoader 上设置根目录，例如：
FXMLLoader fxmlLoader = new FXMLLoader(getClass().getResource("FXMLDocument.fxml"));
fxmlLoader.setRoot(new AnchorPane());
Parent root = fxmlLoader.load();
另请参阅： JavaFx FXML load file issues with setting root