的InvocationTargetException调用控制器方法时 - JavaFX的

我得到的InvocationTargetException当我尝试从控制器（JavaFX的）调用一个方法，将代码放在如下：的InvocationTargetException调用控制器方法时 - JavaFX的

public void start(Stage stage) throws Exception { 

    URL location = getClass().getResource("startScreen.fxml"); 
    FXMLLoader loader = new FXMLLoader(); 

    loader.setLocation(location); 
    loader.setBuilderFactory(new JavaFXBuilderFactory()); 

    //Getting hte controller 
    StartScreenController s = (StartScreenController)loader.getController(); 

    //Where error occurs 
    s.setParent(this); 

    Parent root = (Parent) loader.load(location.openStream()); 

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

它正常工作时，我删除了“ setParent“行。

这似乎已经为其他人（尽我所知，当试图自己解决这个问题）。

任何帮助，将不胜感激，谢谢。

我得到的错误（s.setParent是38行）

Exception in Application start method 
java.lang.reflect.InvocationTargetException 
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) 
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) 
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) 
    at java.lang.reflect.Method.invoke(Method.java:601) 
    at com.javafx.main.Main.launchApp(Main.java:642) 
    at com.javafx.main.Main.main(Main.java:805) 
Caused by: java.lang.RuntimeException: Exception in Application start method 
    at com.sun.javafx.application.LauncherImpl.launchApplication1(LauncherImpl.java:403) 
    at com.sun.javafx.application.LauncherImpl.access$000(LauncherImpl.java:47) 
    at com.sun.javafx.application.LauncherImpl$1.run(LauncherImpl.java:115) 
    at java.lang.Thread.run(Thread.java:722) 
Caused by: java.lang.NullPointerException 
    at johnsoft.dndcommunication.DndCommunication.start(DndCommunication.java:38) 
    at com.sun.javafx.application.LauncherImpl$5.run(LauncherImpl.java:319) 
    at com.sun.javafx.application.PlatformImpl$5.run(PlatformImpl.java:206) 
    at com.sun.javafx.application.PlatformImpl$4.run(PlatformImpl.java:173) 
    at com.sun.glass.ui.win.WinApplication._runLoop(Native Method) 
    at com.sun.glass.ui.win.WinApplication.access$100(WinApplication.java:29) 
    at com.sun.glass.ui.win.WinApplication$3$1.run(WinApplication.java:73) 
    ... 1 more 
Java Result: 1

来源

2013-02-09 John Mikael Gundersen

您似乎试图调用内部控制主类的东西，看到这个链接http://stackoverflow.com/questions/14059954/calling-view-method-in-controller/14063918#14063918 – invariant 2013-02-09 22:22:34

有InvocationTargetException的根本原因？如果是，哪一个？ – 2013-02-10 00:22:53

我会发布整个错误消息，尽管它在发生错误的注释中说。 – 2013-02-10 11:18:35

我想，
您试图加载FXML文件之前访问控制器类。

StartScreenController s = (StartScreenController)loader.getController(); 

// so StartScreenController s is null here thus NPE 
s.setParent(this); 

// here loading is happening after getting the controller class, which is wrong. 
// Get the controller after loading is completed. 

Parent root = (Parent) loader.load(location.openStream());

来源

2013-02-10 14:46:31

@Uluk Biy：你能帮助我吗？ http://stackoverflow.com/q/22243243/2722799 – 2014-03-10 10:18:16

的InvocationTargetException调用控制器方法时 - JavaFX的

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