我使用SceneBuilder表示JavaFX页面，使用NetBeans表示java代码，包括控制器代码。我有几个控制器，所有控制器都加载了一个加载JavaFX页面的代码。它们都有效，除了1页。
以下是加载页面的方法的代码段：
public boolean showAddProductDialog()
{
try
{
// Load the fxml file and create a new stage for the popup dialog.
FXMLLoader loader = new FXMLLoader();
loader.setLocation(FXMLInventoryWizard.class.getResource("AddProductScreen.fxml"));
AnchorPane page = (AnchorPane) loader.load();
System.out.println("page identifier points to loader.load line 227");
// Give the controller access to the main app.
AddProductController controller = loader.getController();
controller.setFXMLInventoryWizard(this);
// Create the dialog Stage.
Stage dialogStage = new Stage();
dialogStage.setTitle("Add Product");
dialogStage.initModality(Modality.WINDOW_MODAL);
dialogStage.initOwner(primaryStage);
Scene scene = new Scene(page);
dialogStage.setScene(scene);
// Set the person into the controller.
AddProductController controller1= loader.getController();
controller1.setDialogStage(dialogStage);
controller1.setFXMLInventoryWizard(this);
// Show the dialog and wait until the user closes it
dialogStage.showAndWait();
// return controller.isOkClicked();
return true;
} catch (IOException e) {
System.out.println("there was an IO Exception");
e.printStackTrace();
return false;
}
}
Here's a code snipet of the one that doesn't load:
public boolean showModifyProductDialog()
{
try
{
// Load the fxml file and create a new stage for the popup dialog.
FXMLLoader loader1 = new FXMLLoader();
System.out.println("we instantiated a FXMLLoader");
// loader1.setRoot(ModifyProductController.ModProdPageAnchorPane);
loader1.setLocation(FXMLInventoryWizard.class.getResource("ModifyProductScreen.fxml"));
System.out.println("loader.load is " + loader1.load().toString());
AnchorPane page1 = (AnchorPane) loader1.load();
System.out.println("did page get assigned to loader.load?");
// Give the controller access to the main app.
ModifyProductController controller = loader1.getController();
controller.setFXMLInventoryWizard(this);
// Create the dialog Stage.
Stage dialogStage = new Stage();
dialogStage.setTitle("Modify Product");
dialogStage.initModality(Modality.WINDOW_MODAL);
dialogStage.initOwner(primaryStage);
Scene scene = new Scene(page1);
dialogStage.setScene(scene);
// Set the person into the controller.
ModifyProductController controller1= loader1.getController();
controller1.setDialogStage(dialogStage);
controller1.setFXMLInventoryWizard(this);
// Show the dialog and wait until the user closes it
dialogStage.showAndWait();
// return controller.isOkClicked();
return true;
} catch (IOException e) {
e.printStackTrace();
return false;
}
}
这里是堆栈跟踪，包括我自己的调试代码的几行（在堆栈跟踪之前）：
in handleModifyProduct method of main page controller
we instantiated a FXMLLoader
in the constructor of ModifyProducttController
in the initialize method of ModifyProductContoller
loader.load is AnchorPane[id=AnchorPane]
javafx.fxml.LoadException: Root value already specified.
file:/C:/Users/altered-chords/Desktop/FXMLInventoryWizard/dist/run164609179/FXMLInventoryWizard.jar!/fxmlinventorywizard/ModifyProductScreen.fxml
file:/C:/Users/altered-chords/Desktop/FXMLInventoryWizard/dist/run164609179/FXMLInventoryWizard.jar!/fxmlinventorywizard/ModifyProductScreen.fxml
at javafx.fxml.FXMLLoader.constructLoadException(FXMLLoader.java:2597)
at javafx.fxml.FXMLLoader.createElement(FXMLLoader.java:2755)
at javafx.fxml.FXMLLoader.processStartElement(FXMLLoader.java:2704)
at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:2527)
at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:2441)
at javafx.fxml.FXMLLoader.load(FXMLLoader.java:2409)
at fxmlinventorywizard.FXMLInventoryWizard.showModifyProductDialog(FXMLInventoryWizard.java:268)
at fxmlinventorywizard.FXMLDocumentController.handleModifyProduct(FXMLDocumentController.java:269)
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:498)
at sun.reflect.misc.Trampoline.invoke(MethodUtil.java:71)
at sun.reflect.GeneratedMethodAccessor1.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at sun.reflect.misc.MethodUtil.invoke(MethodUtil.java:275)
at javafx.fxml.FXMLLoader$MethodHandler.invoke(FXMLLoader.java:1771)
at javafx.fxml.FXMLLoader$ControllerMethodEventHandler.handle(FXMLLoader.java:1657)
at com.sun.javafx.event.CompositeEventHandler.dispatchBubblingEvent(CompositeEventHandler.java:86)
at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:238)
at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:191)
at com.sun.javafx.event.CompositeEventDispatcher.dispatchBubblingEvent(CompositeEventDispatcher.java:59)
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:58)
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
at com.sun.javafx.event.EventUtil.fireEventImpl(EventUtil.java:74)
at com.sun.javafx.event.EventUtil.fireEvent(EventUtil.java:49)
at javafx.event.Event.fireEvent(Event.java:198)
at javafx.scene.Node.fireEvent(Node.java:8413)
at javafx.scene.control.Button.fire(Button.java:185)
at com.sun.javafx.scene.control.behavior.ButtonBehavior.mouseReleased(ButtonBehavior.java:182)
at com.sun.javafx.scene.control.skin.BehaviorSkinBase$1.handle(BehaviorSkinBase.java:96)
at com.sun.javafx.scene.control.skin.BehaviorSkinBase$1.handle(BehaviorSkinBase.java:89)
at com.sun.javafx.event.CompositeEventHandler$NormalEventHandlerRecord.handleBubblingEvent(CompositeEventHandler.java:218)
at com.sun.javafx.event.CompositeEventHandler.dispatchBubblingEvent(CompositeEventHandler.java:80)
at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:238)
at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:191)
at com.sun.javafx.event.CompositeEventDispatcher.dispatchBubblingEvent(CompositeEventDispatcher.java:59)
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:58)
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
at com.sun.javafx.event.EventUtil.fireEventImpl(EventUtil.java:74)
at com.sun.javafx.event.EventUtil.fireEvent(EventUtil.java:54)
at javafx.event.Event.fireEvent(Event.java:198)
at javafx.scene.Scene$MouseHandler.process(Scene.java:3757)
at javafx.scene.Scene$MouseHandler.access$1500(Scene.java:3485)
at javafx.scene.Scene.impl_processMouseEvent(Scene.java:1762)
at javafx.scene.Scene$ScenePeerListener.mouseEvent(Scene.java:2494)
at com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(GlassViewEventHandler.java:381)
at com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(GlassViewEventHandler.java:295)
at java.security.AccessController.doPrivileged(Native Method)
at com.sun.javafx.tk.quantum.GlassViewEventHandler.lambda$handleMouseEvent$354(GlassViewEventHandler.java:417)
at com.sun.javafx.tk.quantum.QuantumToolkit.runWithoutRenderLock(QuantumToolkit.java:389)
at com.sun.javafx.tk.quantum.GlassViewEventHandler.handleMouseEvent(GlassViewEventHandler.java:416)
at com.sun.glass.ui.View.handleMouseEvent(View.java:555)
at com.sun.glass.ui.View.notifyMouse(View.java:937)
at com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
at com.sun.glass.ui.win.WinApplication.lambda$null$148(WinApplication.java:191)
at java.lang.Thread.run(Thread.java:745)
答案 0 :(得分：0)
我用跳蚤梳子检查了代码。比较两个snipets逐行。第4次将工作代码复制到非工作部分并进行编辑。这次它奏效了。看起来我的架构缺乏。太多相同的代码。我有很多要学习的。谢谢大家。