java - JavaFX 无法在自定义加载器中加载 FXML
问题描述
我正在尝试使用 Spring 后端运行 JavaFx 前端。除了加载特定的 FXML 文件外，一切正常。加载其他的就像一个魅力。要设置 spring 和 javafx，我有以下功能：
public class FXMLSpringLoader{
public Parent load(String pathToFXML) throws IOException{
FXMLLoader loader = new FXMLLoader();
//spring is now fxml controller factory
loader.setControllerFactory(applicationContext::getBean);
loader.setResources(resourceBundle);
loader.setLocation(getClass().getResource(pathToFXML));
return loader.load();
}
}
以及StageManager处理设置场景等的类。每次调用该switchScene方法时，我都会得到一个NullPointerException.
public class StageManager {
private final Stage stage;
private final FXMLSpringLoader springLoader;
public StageManager( FXMLSpringLoader fxmlSpringLoader, Stage stage){
this.springLoader = fxmlSpringLoader;
this.stage = stage;
}
public void switchScene(final View view){
Parent rootNode = loadViewNode(view.getFxmlFile());
show(rootNode, view.getTitle());
}
private Parent loadViewNode(String pathToFxml){
Parent rootNode = null;
try{
rootNode = springLoader.load(pathToFxml);
} catch (Exception e){
exit("unable to load fxml " , e);
}
return rootNode;
}
private void show(final Parent rootNode, String title){
Scene scene = prepareScene(rootNode);
this.stage.setTitle(title);
this.stage.setScene(scene);
this.stage.sizeToScene();
this.stage.centerOnScreen();
try {
stage.show();
} catch (Exception exception) {
exit ("error occured while showing scene: " + title, exception);
}
}
private void exit(String message, Exception ex){
System.out.println(message + " " + ex.getCause());
Platform.exit();
}
private Scene prepareScene(Parent rootnode){
Scene scene = stage.getScene();
if (scene == null) {
scene = new Scene(rootnode);
}
scene.setRoot(rootnode);
return scene;
}
}
该方法在 Controller 中调用，如下所示：
stageManager.switchScene(View.PRODUCT);
我的视图类是一个枚举：
public enum View {
PRODUCT {
public String getTitle(){
return ResourceBundle.getBundle("Bundle").getString("product.title");
}
public String getFxmlFile(){
return "/fxml/Product.fxml";
}
};
public abstract String getTitle();
public abstract String getFxmlFile();
}
很抱歉发布了这么多代码，但我真的尝试了一切，但无法加载这个单一的 fxml。我已经尝试getClass().getClassLoader().getRes...并尝试将路径更改"/fxml/Product.fxml"为"resources/fxml/Product.fxml"or "../Product.fxml"。每一个帮助表示赞赏！
堆栈跟踪：
javafx.fxml.LoadException:
/C:/Users/Alienware/Desktop/java/inventory%20management%20system/jFXSpring/target/classes/fxml/Product.fxml
at javafx.fxml/javafx.fxml.FXMLLoader.constructLoadException(FXMLLoader.java:2625)
at javafx.fxml/javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:2603)
at javafx.fxml/javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:2466)
at javafx.fxml/javafx.fxml.FXMLLoader.load(FXMLLoader.java:2435)
at com.kutuco.jFXSpring.config.FXMLSpringLoader.load(FXMLSpringLoader.java:36)
at com.kutuco.jFXSpring.config.StageManager.loadViewNode(StageManager.java:33)
at com.kutuco.jFXSpring.config.StageManager.switchScene(StageManager.java:25)
at com.kutuco.jFXSpring.config.StageManager$$FastClassBySpringCGLIB$$56b2684c.invoke(<generated>)
at org.springframework.cglib.proxy.MethodProxy.invoke(MethodProxy.java:204)
at org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept(CglibAopProxy.java:684)
at com.kutuco.jFXSpring.config.StageManager$$EnhancerBySpringCGLIB$$c9747e15.switchScene(<generated>)
at com.kutuco.jFXSpring.controller.LoginController.login(LoginController.java:50)
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 com.sun.javafx.reflect.Trampoline.invoke(MethodUtil.java:76)
at jdk.internal.reflect.GeneratedMethodAccessor15.invoke(Unknown Source)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:564)
at javafx.base/com.sun.javafx.reflect.MethodUtil.invoke(MethodUtil.java:275)
at javafx.fxml/com.sun.javafx.fxml.MethodHelper.invoke(MethodHelper.java:83)
at javafx.fxml/javafx.fxml.FXMLLoader$MethodHandler.invoke(FXMLLoader.java:1782)
at javafx.fxml/javafx.fxml.FXMLLoader$ControllerMethodEventHandler.handle(FXMLLoader.java:1670)
at javafx.base/com.sun.javafx.event.CompositeEventHandler.dispatchBubblingEvent(CompositeEventHandler.java:86)
at javafx.base/com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:238)
at javafx.base/com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:191)
at javafx.base/com.sun.javafx.event.CompositeEventDispatcher.dispatchBubblingEvent(CompositeEventDispatcher.java:59)
at javafx.base/com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:58)
at javafx.base/com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
at javafx.base/com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
at javafx.base/com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
at javafx.base/com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
at javafx.base/com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
at javafx.base/com.sun.javafx.event.EventUtil.fireEventImpl(EventUtil.java:74)
at javafx.base/com.sun.javafx.event.EventUtil.fireEvent(EventUtil.java:49)
at javafx.base/javafx.event.Event.fireEvent(Event.java:198)
at javafx.graphics/javafx.scene.Node.fireEvent(Node.java:8865)
at javafx.controls/javafx.scene.control.Button.fire(Button.java:200)
at javafx.controls/com.sun.javafx.scene.control.behavior.ButtonBehavior.mouseReleased(ButtonBehavior.java:206)
at javafx.controls/com.sun.javafx.scene.control.inputmap.InputMap.handle(InputMap.java:274)
at javafx.base/com.sun.javafx.event.CompositeEventHandler$NormalEventHandlerRecord.handleBubblingEvent(CompositeEventHandler.java:218)
at javafx.base/com.sun.javafx.event.CompositeEventHandler.dispatchBubblingEvent(CompositeEventHandler.java:80)
at javafx.base/com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:238)
at javafx.base/com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:191)
at javafx.base/com.sun.javafx.event.CompositeEventDispatcher.dispatchBubblingEvent(CompositeEventDispatcher.java:59)
at javafx.base/com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:58)
at javafx.base/com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
at javafx.base/com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
at javafx.base/com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
at javafx.base/com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
at javafx.base/com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
at javafx.base/com.sun.javafx.event.EventUtil.fireEventImpl(EventUtil.java:74)
at javafx.base/com.sun.javafx.event.EventUtil.fireEvent(EventUtil.java:54)
at javafx.base/javafx.event.Event.fireEvent(Event.java:198)
at javafx.graphics/javafx.scene.Scene$MouseHandler.process(Scene.java:3876)
at javafx.graphics/javafx.scene.Scene$MouseHandler.access$1300(Scene.java:3604)
at javafx.graphics/javafx.scene.Scene.processMouseEvent(Scene.java:1874)
at javafx.graphics/javafx.scene.Scene$ScenePeerListener.mouseEvent(Scene.java:2613)
at javafx.graphics/com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(GlassViewEventHandler.java:397)
at javafx.graphics/com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(GlassViewEventHandler.java:295)
at java.base/java.security.AccessController.doPrivileged(Native Method)
at javafx.graphics/com.sun.javafx.tk.quantum.GlassViewEventHandler.lambda$handleMouseEvent$2(GlassViewEventHandler.java:434)
at javafx.graphics/com.sun.javafx.tk.quantum.QuantumToolkit.runWithoutRenderLock(QuantumToolkit.java:389)
at javafx.graphics/com.sun.javafx.tk.quantum.GlassViewEventHandler.handleMouseEvent(GlassViewEventHandler.java:433)
at javafx.graphics/com.sun.glass.ui.View.handleMouseEvent(View.java:556)
at javafx.graphics/com.sun.glass.ui.View.notifyMouse(View.java:942)
at javafx.graphics/com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
at javafx.graphics/com.sun.glass.ui.win.WinApplication.lambda$runLoop$3(WinApplication.java:175)
at java.base/java.lang.Thread.run(Thread.java:844)
Caused by: java.lang.NullPointerException
at com.kutuco.jFXSpring.controller.ProductController.setColumns(ProductController.java:115)
at com.kutuco.jFXSpring.controller.ProductController.initialize(ProductController.java:106)
at javafx.fxml/javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:2573)
... 68 more
Caused by: java.lang.reflect.InvocationTargetException
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:564)
at com.sun.javafx.reflect.Trampoline.invoke(MethodUtil.java:76)
at jdk.internal.reflect.GeneratedMethodAccessor15.invoke(Unknown Source)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:564)
at javafx.base/com.sun.javafx.reflect.MethodUtil.invoke(MethodUtil.java:275)
at javafx.fxml/com.sun.javafx.fxml.MethodHelper.invoke(MethodHelper.java:83)
at javafx.fxml/javafx.fxml.FXMLLoader$MethodHandler.invoke(FXMLLoader.java:1782)
... 47 more
Caused by: java.lang.NullPointerException: Scene's root cannot be null
at javafx.graphics/javafx.scene.Scene$8.invalidated(Scene.java:1222)
at javafx.base/javafx.beans.property.ObjectPropertyBase.markInvalid(ObjectPropertyBase.java:112)
at javafx.base/javafx.beans.property.ObjectPropertyBase.set(ObjectPropertyBase.java:147)
at javafx.graphics/javafx.scene.Scene.setRoot(Scene.java:1199)
at com.kutuco.jFXSpring.config.StageManager.prepareScene(StageManager.java:74)
at com.kutuco.jFXSpring.config.StageManager.show(StageManager.java:43)
at com.kutuco.jFXSpring.config.StageManager.switchScene(StageManager.java:26)
at com.kutuco.jFXSpring.config.StageManager$$FastClassBySpringCGLIB$$56b2684c.invoke(<generated>)
at org.springframework.cglib.proxy.MethodProxy.invoke(MethodProxy.java:204)
at org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept(CglibAopProxy.java:684)
at com.kutuco.jFXSpring.config.StageManager$$EnhancerBySpringCGLIB$$c9747e15.switchScene(<generated>)
at com.kutuco.jFXSpring.controller.LoginController.login(LoginController.java:50)
... 58 more
我的 ProductController 中的第 115 行：
public void setColumns(){
...
colProductId.setCellValueFactory(new PropertyValueFactory<>("id"));
...
}
解决方案
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