大家好,我一直在NetBeans 8.2和Gluon Scene Builder上开发一个JavaFx应用程序。İ初始程序给了我一个输出。在开发之后,我收到错误。
(我在这个平台上尝试了很多建议,我清理并构建了项目,我更改了我的fxml文件位置,我删除并重新上传了Scene Builder,我甚至删除了整个项目并重新写下,看看我是否忘记了什么。该程序不包含任何语法错误。我的服务器和客户端都正常工作。运行JavaFXMLApplication.java时出现错误)
我可能遗漏了什么,不是错的。
HP的用户变量
PATH: C:\Users\HP\Envs\gui; C:\Users\HP\Desktop\jdk-11.0.2
系统变量
PATH:C:\Program Files\Python37\Scripts\;C:\Program
Files\Python37\;C:\Users\HP\Envs\gui;C:\Program
Files\Java\jdk1.8.0_111\bin;C:\Program Files\Java\jdk-11.0.2\bin
我的fxml文件
<AnchorPane id="AnchorPane" prefHeight="200" prefWidth="320"
xmlns:fx="http://javafx.com/fxml/1"
fx:controller="javafxmlapplication.FXMLDocumentController">
代码:
package javafxmlapplication;
import java.util.Random;
import java.util.Timer;
import java.util.TimerTask;
import javafx.application.Application;
import javafx.fxml.FXMLLoader;
import javafx.scene.Parent;
import javafx.scene.Scene;
import javafx.stage.Stage;
public class JavaFXMLApplication extends Application {
@Override
public void start(Stage stage) throws Exception {
Parent root = FXMLLoader.load(getClass().getResource
("/src/javafxmlapplication/fxml/FXMLDocument.fxml"));
Scene scene = new Scene(root,900,600);
stage.setTitle("GUI");
stage.setScene(scene);
stage.show();
Timer timer = new Timer();
timer.scheduleAtFixedRate(new TimerTask(){
@Override
public void run(){
Random rand = new Random();
int myrand = rand.nextInt(15)+1;
System.out.println((myrand+1)+"blue");
root.getChildrenUnmodifiable().get(myrand).setStyle("-fx-background-color: #001f3f");
try{
Thread.sleep(1000);
}
catch(InterruptedException e){
//e.printStackTrace();
System.out.println(e);
}
root.getChildrenUnmodifiable().get(myrand).setStyle("-fx-background-color : #FF4136");
}
},0,1000);
}
/**
* @param args the command line arguments
*/
public static void main(String[] args) {
launch(args);
}
}
在错误消息中,system标记此行,但行号没有给出错误(我尝试添加getClassLoader(),它给出了相同的错误)
Parent root = FXMLLoader.load(getClass().getResource
("/src/javafxmlapplication/fxml/FXMLDocument.fxml"));
我的系统在cmd中有java和javac代码的正输出。
Executing C:\Users\HP\Documents\NetBeansProjects\JavaFXMLApplication\dist\run1672502609\JavaFXMLApplication.jar using platform C:\Program Files\Java\jdk1.8.0_111\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:498)
at com.sun.javafx.application.LauncherImpl.launchApplicationWithArgs(LauncherImpl.java:389)
at com.sun.javafx.application.LauncherImpl.launchApplication(LauncherImpl.java:328)
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.launcher.LauncherHelper$FXHelper.main(LauncherHelper.java:767)
Caused by: java.lang.RuntimeException: Exception in Application start method
at com.sun.javafx.application.LauncherImpl.launchApplication1(LauncherImpl.java:917)
at com.sun.javafx.application.LauncherImpl.lambda$launchApplication$155(LauncherImpl.java:182)
at java.lang.Thread.run(Thread.java:745)
Caused by: java.lang.NullPointerException: Location is required.
at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3207)
at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3175)
at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3148)
at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3124)
at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3104)
at javafx.fxml.FXMLLoader.load(FXMLLoader.java:3097)
at com.sun.javafx.application.LauncherImpl.lambda$launchApplication1$162(LauncherImpl.java:863)
at com.sun.javafx.application.PlatformImpl.lambda$runAndWait$175(PlatformImpl.java:326)
at com.sun.javafx.application.PlatformImpl.lambda$null$173(PlatformImpl.java:295)
at java.security.AccessController.doPrivileged(Native Method)
at com.sun.javafx.application.PlatformImpl.lambda$runLater$174(PlatformImpl.java:294)
at com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:95)
at com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
at com.sun.glass.ui.win.WinApplication.lambda$null$148(WinApplication.java:191)
... 1 more
Exception running application javafxmlapplication.JavaFXMLApplication
Java Result: 1
Deleting directory C:\Users\HP\Documents\NetBeansProjects\JavaFXMLApplication\dist\run1672502609
jfxsa-run:
BUILD SUCCESSFUL (total time: 2 seconds)
此错误在下方
javafxmlapplication.JavaFXMLApplication.start(JavaFXMLApplication.java:25)
指出了这一点
Parent root = FXMLLoader.load(getClass().getClassLoader().getResource("/src/javafxmlapplication/fxml/FXMLDocument.fxml"));
如果有任何帮助,我将不胜感激。
发布于 2019-03-13 06:30:24
您使用了错误的路径来加载fxml文件。使用fxml/FXMLDocument.fxml
或/javafxapplication/fxml/FXMLDocument.fxml
。
查找具有给定名称的资源。用于搜索与给定类相关联的资源的规则由类的定义类加载器实现。这个方法委托给这个对象的类加载器。如果此对象是由引导类加载器加载的,则该方法将委托给ClassLoader.getSystemResource(java.lang.String).在委托之前,使用以下算法从给定的资源名称构造绝对资源名称:
如果名称以'/‘('\u002f')开头,则资源的绝对名称是'/'.
来自javadoc。
因此,下面的代码应该可以工作:
Parent root = FXMLLoader.load(getClass().getResource("fxml/FXMLDocument.fxml"));
或者:
Parent root = FXMLLoader.load(getClass().getResource("/javafxapplication/fxml/FXMLDocument.fxml"));
https://stackoverflow.com/questions/55118628
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