InvocationTargetException when running a javafx program

Question

So this worked in the example from javafx when My pc had jdk 1.7.0 so this may be the new version of FX in java8 however;

I get a nice stack-trace

jfx-project-run: Executing E:\workspace\PathFinderApp\dist\run1095471771\PathFinderApp.jar using platform C:\Program Files\Java\jdk1.8.0\jre/bin/java Exception in Application start method java.lang.reflect.InvocationTargetException     at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)     at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)     at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)     at java.lang.reflect.Method.invoke(Method.java:483)     at com.sun.javafx.application.LauncherImpl.launchApplicationWithArgs(LauncherImpl.java:367)     at com.sun.javafx.application.LauncherImpl.launchApplication(LauncherImpl.java:305)     at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)     at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)     at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)     at java.lang.reflect.Method.invoke(Method.java:483)     at sun.launcher.LauncherHelper$FXHelper.main(LauncherHelper.java:767) Caused by: java.lang.RuntimeException: Exception in Application start method     at com.sun.javafx.application.LauncherImpl.launchApplication1(LauncherImpl.java:894)     at com.sun.javafx.application.LauncherImpl.access$000(LauncherImpl.java:56)     at com.sun.javafx.application.LauncherImpl$1.run(LauncherImpl.java:158)     at java.lang.Thread.run(Thread.java:744) Caused by: javafx.fxml.LoadException:  file:/E:/workspace/PathFinderApp/dist/run1095471771/PathFinderApp.jar!/com/rpg/gui/main.fxml:11      at javafx.fxml.FXMLLoader.constructLoadException(FXMLLoader.java:2617)     at javafx.fxml.FXMLLoader.access$700(FXMLLoader.java:104)     at javafx.fxml.FXMLLoader$ValueElement.processAttribute(FXMLLoader.java:937)     at javafx.fxml.FXMLLoader$InstanceDeclarationElement.processAttribute(FXMLLoader.java:976)     at javafx.fxml.FXMLLoader$Element.processStartElement(FXMLLoader.java:216)     at javafx.fxml.FXMLLoader$ValueElement.processStartElement(FXMLLoader.java:738)     at javafx.fxml.FXMLLoader.processStartElement(FXMLLoader.java:2723)     at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:2527)     at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:2441)     at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3230)     at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3191)     at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3164)     at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3140)     at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3120)     at javafx.fxml.FXMLLoader.load(FXMLLoader.java:3113)     at com.rpg.gui.GUI.loadMainPane(GUI.java:34)     at com.rpg.gui.GUI.initialize(GUI.java:20)     at Main.start(Main.java:20)     at com.sun.javafx.application.LauncherImpl$8.run(LauncherImpl.java:837)     at com.sun.javafx.application.PlatformImpl$7.run(PlatformImpl.java:335)     at com.sun.javafx.application.PlatformImpl$6$1.run(PlatformImpl.java:301)     at com.sun.javafx.application.PlatformImpl$6$1.run(PlatformImpl.java:298)     at java.security.AccessController.doPrivileged(Native Method)     at com.sun.javafx.application.PlatformImpl$6.run(PlatformImpl.java:298)     at com.sun.glass.ui.InvokeLaterDispatcher$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$1.run(WinApplication.java:112)     ... 1 more Caused by: java.lang.InstantiationException: com.rpg.gui.MainController     at java.lang.Class.newInstance(Class.java:418)     at sun.reflect.misc.ReflectUtil.newInstance(ReflectUtil.java:51)     at javafx.fxml.FXMLLoader$ValueElement.processAttribute(FXMLLoader.java:932)     ... 26 more Caused by: java.lang.NoSuchMethodException: com.rpg.gui.MainController.<init>()     at java.lang.Class.getConstructor0(Class.java:2971)     at java.lang.Class.newInstance(Class.java:403)     ... 28 more Exception running application Main Java Result: 1 

basically telling me something is wrong here "com/rpg/gui/main.fxml:11"

and that line is

<AnchorPane id="AnchorPane" prefHeight="400.0" prefWidth="600.0" xmlns:fx="http://javafx.com/fxml" fx:controller="com.rpg.gui.MainController"> 

so I can figure out that it doesn't like something to do with the main controller, so it has to be somthing to do with loading the fxml and the controller right? but thats about where my ideas end

MainController mainController = new MainController(path); Pane mainPane = FXMLLoader.load(getClass().getResource("main.fxml")); Window.setMainController(mainController); Window.swap(path+"content.fxml"); 

that's the method it throws everything in anyone experienced in javaFX or know of any changes in java8 that'd do this??

Answer 1

Your MainController doesn't have a zero-argument constructor. If the FXMLLoader encounters a fx:controller attribute on the root element, it attempts to create an instance of that controller by (effectively) calling the zero-argument constructor of the class specified in the attribute.

To fix this (the simplest way), remove the fx:controller attribute from the FXML file, and set the controller "by hand" on the FXMLLoader. You need to create an FXMLLoader instance instead of relying on the static load(...) method:

FXMLLoader loader = new FXMLLoader(getClass().getResource("main.fxml")); loader.setController(new MainController(path)); Pane mainPane = loader.load();