java JavaFX 调用目标异常
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JavaFX InvocationTargetException
提问by user2037559
I have the code:
我有代码：
package core;
import javafx.application.Application;
import javafx.fxml.FXMLLoader;
import javafx.scene.Parent;
import javafx.scene.Scene;
import javafx.stage.Stage;
public class Main extends Application {
@Override
public void start(Stage primaryStage) throws Exception{
Parent root = FXMLLoader.load(getClass().getResource("main.fxml"));
primaryStage.setTitle("Hello World");
primaryStage.setScene(new Scene(root, 300, 275));
primaryStage.show();
}
public static void main(String[] args) {
launch(args);
}
}
This is my project structure: https://imgur.com/a/5ipF1
这是我的项目结构：https: //imgur.com/a/5ipF1
And here is my error message:
这是我的错误信息：
"C:\Program Files\Java\jdk-9\bin\java" "-javaagent:C:\Program Files\JetBrains\IntelliJ IDEA Community Edition 2017.2.5\lib\idea_rt.jar=54416:C:\Program Files\JetBrains\IntelliJ IDEA Community Edition 2017.2.5\bin" -Dfile.encoding=UTF-8 -classpath C:\Users\nikoe\OneDrive\Arbeit\MysteryShopper\Java\out\production\classes;C:\Users\nikoe\.gradle\caches\modules-2\files-2.1\org.xerial\sqlite-jdbc.21.0.1a0bcda2f100dc91dc402554f60ed2f696cded5\sqlite-jdbc-3.21.0.1.jar core.Main
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:564)
at javafx.graphics/com.sun.javafx.application.LauncherImpl.launchApplicationWithArgs(LauncherImpl.java:473)
at javafx.graphics/com.sun.javafx.application.LauncherImpl.launchApplication(LauncherImpl.java:372)
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 java.base/sun.launcher.LauncherHelper$FXHelper.main(LauncherHelper.java:945)
Caused by: java.lang.RuntimeException: Exception in Application start method
at javafx.graphics/com.sun.javafx.application.LauncherImpl.launchApplication1(LauncherImpl.java:973)
at javafx.graphics/com.sun.javafx.application.LauncherImpl.lambda$launchApplication(LauncherImpl.java:198)
at java.base/java.lang.Thread.run(Thread.java:844)
Caused by: java.lang.NullPointerException: Location is required.
at javafx.fxml/javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3246)
at javafx.fxml/javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3210)
at javafx.fxml/javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3179)
at javafx.fxml/javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3152)
at javafx.fxml/javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3129)
at javafx.fxml/javafx.fxml.FXMLLoader.load(FXMLLoader.java:3122)
at core.Main.start(Main.java:14)
at javafx.graphics/com.sun.javafx.application.LauncherImpl.lambda$launchApplication1(LauncherImpl.java:919)
at javafx.graphics/com.sun.javafx.application.PlatformImpl.lambda$runAndWait(PlatformImpl.java:449)
at javafx.graphics/com.sun.javafx.application.PlatformImpl.lambda$runLater(PlatformImpl.java:418)
at java.base/java.security.AccessController.doPrivileged(Native Method)
at javafx.graphics/com.sun.javafx.application.PlatformImpl.lambda$runLater(PlatformImpl.java:417)
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(WinApplication.java:189)
... 1 more
Exception running application core.Main
Process finished with exit code 1
It is weird, because it worked before I added Gradle to the project. After adding Gradle I had to remark "src" as "Sources Root".
这很奇怪，因为它在我将 Gradle 添加到项目之前就起作用了。添加 Gradle 后，我不得不将“src”标记为“Sources Root”。
This structure is the basic structure that IntelliJ generates for JavaFX projects.
这个结构是 IntelliJ 为 JavaFX 项目生成的基本结构。
Any ideas?
有任何想法吗？
回答by Nikiforos
You have not set a resources folder in your project structure in order the getResoursemethod to work.
您尚未在项目结构中设置资源文件夹以使该getResourse方法起作用。
Since you don't have the common Java structure, try providing the full path instead:
由于您没有通用的 Java 结构，请尝试提供完整路径：
FXMLLoader loader = new FXMLLoader(new File("fullpath").toURI().toURL());
Parent root = loader.load();
And if you want your code to work, you should be having a structure like the following, where main.fxmlis inside resources directory:
如果你想让你的代码工作，你应该有一个像下面这样的结构，在main.fxml资源目录中：
You can set a folder as "Resources folder" here: Project Structure->Modules->Sources
您可以在此处将文件夹设置为“资源文件夹”：Project Structure->Modules->Sources
