问题描述
我尝试用一个TextField和Button创建一个屏幕,并接收"Application start method中的异常".第一次,我尝试从这些问题中解决问题,但不起作用:
I try to create a screen with one TextField and Button and receve "Exception in Application start method". Firt time I try solution from this questions and dont work:
我使用Java 11,javaFx 11.对于javaFx,我使用maven.
I use Java 11, javaFx 11.For javaFx I use maven.
主要类别是:
import javafx.application.Application;
import javafx.fxml.FXMLLoader;
import javafx.scene.Parent;
import javafx.scene.Scene;
import javafx.stage.Stage;
public class StartClass extends Application{
public static void main(String[] args) {
launch(args);
}
@Override
public void start(Stage stage) throws Exception {
Parent parent = FXMLLoader.load(getClass().getResource("../userInterface/CreateProjectScreen.fxml"));
stage.setTitle("IEPCP");
stage.setScene(new Scene(parent ));
stage.show();
}
}
FXML文件是:
<?xml version="1.0" encoding="UTF-8"?>
<?import javafx.scene.control.Button?>
<?import javafx.scene.control.TextField?>
<?import javafx.scene.layout.AnchorPane?>
<AnchorPane prefHeight="400.0" prefWidth="600.0" xmlns="http://javafx.com/javafx/11.0.1" xmlns:fx="http://javafx.com/fxml/1" fx:controller="controllers.ui.CreateProjectController">
<children>
<AnchorPane prefHeight="402.0" prefWidth="601.0">
<children>
<Button fx:id="sendButton" layoutX="249.0" layoutY="310.0" mnemonicParsing="false" onAction="#sendButtonClicked" text="Button" />
<TextField fx:id="directory" layoutX="66.0" layoutY="85.0" prefHeight="25.0" prefWidth="470.0" />
</children>
</AnchorPane>
</children>
</AnchorPane>
控制器类:
import javafx.event.ActionEvent;
import javafx.fxml.FXML;
import javafx.scene.control.Button;
import javafx.scene.control.TextField;
public class CreateProjectController {
@FXML
private TextField directory;
@FXML
private Button sendButton;
public TextField getDirectory() {
return directory;
}
public void setDirectory(TextField directory) {
this.directory = directory;
}
public void sendButtonClicked(ActionEvent actionEvent){
System.out.println("You write: " + getDirectory().getText());
}
}
这是错误提示:
Exception in Application start method
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:566)
at javafx.graphics/com.sun.javafx.application.LauncherImpl.launchApplicationWithArgs(LauncherImpl.java:464)
at javafx.graphics/com.sun.javafx.application.LauncherImpl.launchApplication(LauncherImpl.java:363)
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:566)
at java.base/sun.launcher.LauncherHelper$FXHelper.main(LauncherHelper.java:1051)
Caused by: java.lang.RuntimeException: Exception in Application start method
at javafx.graphics/com.sun.javafx.application.LauncherImpl.launchApplication1(LauncherImpl.java:900)
at javafx.graphics/com.sun.javafx.application.LauncherImpl.lambda$launchApplication$2(LauncherImpl.java:195)
at java.base/java.lang.Thread.run(Thread.java:834)
Caused by: java.lang.IllegalAccessError: class com.sun.javafx.fxml.FXMLLoaderHelper (in unnamed module @0x3e122bd1) cannot access class com.sun.javafx.util.Utils (in module javafx.graphics) because module javafx.graphics does not export com.sun.javafx.util to unnamed module @0x3e122bd1
at com.sun.javafx.fxml.FXMLLoaderHelper.<clinit>(FXMLLoaderHelper.java:38)
at javafx.fxml.FXMLLoader.<clinit>(FXMLLoader.java:2056)
at primary.StartClass.start(StartClass.java:17)
at javafx.graphics/com.sun.javafx.application.LauncherImpl.lambda$launchApplication1$9(LauncherImpl.java:846)
at javafx.graphics/com.sun.javafx.application.PlatformImpl.lambda$runAndWait$12(PlatformImpl.java:455)
at javafx.graphics/com.sun.javafx.application.PlatformImpl.lambda$runLater$10(PlatformImpl.java:428)
at java.base/java.security.AccessController.doPrivileged(Native Method)
at javafx.graphics/com.sun.javafx.application.PlatformImpl.lambda$runLater$11(PlatformImpl.java:427)
at javafx.graphics/com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:96)
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:174)
... 1 more
Exception running application primary.StartClass
Maven依赖项:
<dependencies>
<dependency>
<groupId>org.openjfx</groupId>
<artifactId>javafx-controls</artifactId>
<version>11</version>
</dependency>
<dependency>
<groupId>org.openjfx</groupId>
<artifactId>javafx-fxml</artifactId>
<version>11</version>
</dependency>
</dependencies>
推荐答案
问题与您提供给 FXMLLoader
的路径有关.如果您的FXML文件位于 src/main/resources/userInterface/CreateProjectScreen.fxml
中,则您的 FXMLLoader
应该如下调用:
The issue is to do with the path that you are providing to your FXMLLoader
.If your FXML file is in src/main/resources/userInterface/CreateProjectScreen.fxml
, then your FXMLLoader
should be called as follows:
Parent parent = FXMLLoader.load(getClass().getResource("/userInterface/CreateProjectScreen.fxml"));
前斜杠指的是类路径的根(即 src/main/resources
).紧随其后的路径是FXML文件的相对路径.
The leading slash refers to the root of the classpath (i.e. src/main/resources
). The path following that is the relative path to the FXML file.
您还收到模块访问错误.您需要导出错误消息中列出的模块,否则JavaFX将无法访问它.
You are also getting a module access error. You need to export the module listed in the error message, otherwise JavaFX will not be able to access it.
这篇关于应用程序启动方法中的异常.JavaFx 11的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持!