加载FXML时解析“onAction”时出错

我在运行一个简单的Hello World应用程序时遇到了一些问题。它抛出以下错误：加载FXML时解析“onAction”时出错

Exception in Application start method 
Exception in thread "main" java.lang.RuntimeException: Exception in Application start method 
    at com.sun.javafx.application.LauncherImpl.launchApplication1(LauncherImpl.java:917) 
    at com.sun.javafx.application.LauncherImpl.lambda$launchApplication$152(LauncherImpl.java:182) 
    at com.sun.javafx.application.LauncherImpl$$Lambda$2/1329552164.run(Unknown Source) 
    at java.lang.Thread.run(Thread.java:745) 
Caused by: javafx.fxml.LoadException: Error resolving onAction='#printHello', either the event handler is not in the Namespace or there is an error in the script. 
/home/willi/java/IdeaProjects/JavaFXApp/out/production/JavaFXApp/sample/sample.fxml:23 

    at javafx.fxml.FXMLLoader.constructLoadException(FXMLLoader.java:2601) 
    at javafx.fxml.FXMLLoader.access$100(FXMLLoader.java:104) 
    at javafx.fxml.FXMLLoader$Element.processEventHandlerAttributes(FXMLLoader.java:606) 
    at javafx.fxml.FXMLLoader$ValueElement.processEndElement(FXMLLoader.java:766) 
    at javafx.fxml.FXMLLoader.processEndElement(FXMLLoader.java:2827) 
    at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:2536) 
    at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:2445) 
    at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3218) 
    at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3179) 
    at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3152) 
    at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3128) 
    at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3108) 
    at javafx.fxml.FXMLLoader.load(FXMLLoader.java:3101) 
    at sample.Main.start(Main.java:13) 
    at com.sun.javafx.application.LauncherImpl.lambda$launchApplication1$159(LauncherImpl.java:863) 
    at com.sun.javafx.application.LauncherImpl$$Lambda$57/2085742749.run(Unknown Source) 
    at com.sun.javafx.application.PlatformImpl.lambda$runAndWait$172(PlatformImpl.java:326) 
    at com.sun.javafx.application.PlatformImpl$$Lambda$52/738441956.run(Unknown Source) 
    at com.sun.javafx.application.PlatformImpl.lambda$null$170(PlatformImpl.java:295) 
    at com.sun.javafx.application.PlatformImpl$$Lambda$55/689939224.run(Unknown Source) 
    at java.security.AccessController.doPrivileged(Native Method) 
    at com.sun.javafx.application.PlatformImpl.lambda$runLater$171(PlatformImpl.java:294) 
    at com.sun.javafx.application.PlatformImpl$$Lambda$53/1382865734.run(Unknown Source) 
    at com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:95) 
    at com.sun.glass.ui.gtk.GtkApplication._runLoop(Native Method) 
    at com.sun.glass.ui.gtk.GtkApplication.lambda$null$48(GtkApplication.java:139) 
    at com.sun.glass.ui.gtk.GtkApplication$$Lambda$43/704249306.run(Unknown Source) 
    ... 1 more

我Controller.java文件在此定义printHello和printWorld的方法，我想打电话给他们时，我按他们的相应按钮。代码如下：包样本;

import javafx.fxml.FXML; 
import javafx.scene.control.Button; 
import java.awt.event.ActionEvent; 

public class Controller { 

    @FXML 
    private Button helloButton; 

    @FXML 
    private Button worldButton; 

    @FXML 
    private void printHello(ActionEvent e){ 
     System.out.println("Hello"); 
    } 

    @FXML 
    private void printWorld(ActionEvent f){ 
     System.out.println("World"); 
    } 
}

`在我的fxml文件中，我定义了两个按钮。他们的代码如下：

<Button fx:id="helloButton" layoutX="46.0" layoutY="87.0" mnemonicParsing="false" onAction="#printHello" text="Hello" /> 

<Button fx:id="worldButton" layoutX="97.0" layoutY="87.0" mnemonicParsing="false" onAction="#printWorld" text="World" />

为什么我的代码抛出这个错误？

对不起，可怕的格式，这是我第一次发布。

来源

2015-04-08 DesolateTen

请发表你想运行的实际代码。 – mjuarez

这应该工作。你能确定你在fxml中提供了正确的控制器类名吗？或者，在这里发布完整的fxml以及Controller的软件包名称。 – ItachiUchiha

您在控制器类中导入了错误的ActionEvent。

import java.awt.event.ActionEvent;

纠正它

import javafx.event.ActionEvent;

来源

2015-04-08 05:42:34

加载FXML时解析“onAction”时出错

回答

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