应用程序启动方法错误中的异常.其他解决方案不起作用 [英] Exception in Application start method error. Other solutions not working
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问题描述
一切正常，然后运行代码，并得到此错误.
Everything was going well, then I run my code and I get this error.
我已经尝试了以下解决方案(无济于事):
I have already tried the following solutions (nothing worked):
http://stackoverflow.com/questions/22000423/javafx-and-maven-nullpointerexception-location-required
main.java
main.java
package stockBot;
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("resources/main.fxml"));
primaryStage.setScene(new Scene(root));
primaryStage.show();
}
public static void main(String[] args) {
launch(args);
}
}
main.fxml
main.fxml
<?xml version="1.0" encoding="UTF-8"?>
<?import de.jensd.fx.glyphs.fontawesome.FontAwesomeIconView?>
<?import javafx.scene.control.Button?>
<?import javafx.scene.control.Label?>
<?import javafx.scene.control.TableColumn?>
<?import javafx.scene.control.TableView?>
<?import javafx.scene.layout.AnchorPane?>
<?import javafx.scene.layout.HBox?>
<?import javafx.scene.text.Font?>
<AnchorPane maxHeight="-Infinity" maxWidth="-Infinity" minHeight="-Infinity" minWidth="-Infinity" prefHeight="545.0" prefWidth="1024.0" styleClass="background" stylesheets="@application.css" xmlns="http://javafx.com/javafx/8.0.171" xmlns:fx="http://javafx.com/fxml/1" fx:controller="stockBot.Main">
<children>
<HBox maxHeight="-Infinity" maxWidth="-Infinity" minHeight="-Infinity" minWidth="-Infinity" prefHeight="50.0" prefWidth="1024.0" styleClass="background-bar" stylesheets="@application.css" />
<Button maxHeight="-Infinity" maxWidth="-Infinity" minHeight="-Infinity" minWidth="-Infinity" mnemonicParsing="false" prefHeight="20.0" prefWidth="20.0" styleClass="background-button-exit" stylesheets="@application.css" translateX="1000.0" translateY="12.0">
<graphic>
<FontAwesomeIconView glyphName="CLOSE" size="16" />
</graphic>
</Button>
<Button maxHeight="-Infinity" maxWidth="-Infinity" minHeight="-Infinity" minWidth="-Infinity" mnemonicParsing="false" prefHeight="20.0" prefWidth="20.0" styleClass="background-button-minus" stylesheets="@application.css" translateX="975.0" translateY="12.0">
<graphic>
<FontAwesomeIconView glyphName="MINUS" size="16" translateY="2.0" />
</graphic>
</Button>
<Label text="Stock" textFill="WHITE">
<font>
<Font name="Avenir Heavy Oblique" size="43.0" />
</font>
</Label>
<Label text="Bot" textFill="#3fae2a" translateX="110.0">
<font>
<Font name="Avenir Heavy Oblique" size="43.0" />
</font>
</Label>
<Button alignment="CENTER" mnemonicParsing="false" styleClass="create-task-btn" stylesheets="@application.css" text="Create Task" textAlignment="CENTER" textFill="#ababab" translateX="450.0" translateY="10.0">
<font>
<Font name="Avenir Heavy" size="18.0" />
</font>
</Button>
<TableView prefHeight="440.0" prefWidth="950.0" styleClass="table-main" stylesheets="@application.css" translateX="37.0" translateY="70.0">
<columns>
<TableColumn prefWidth="395.4969062805176" styleClass="table-item" text="Product Name" />
<TableColumn prefWidth="97.50311279296875" styleClass="table-item" text="Current Price" />
<TableColumn prefWidth="92.45794677734375" styleClass="table-item" text="Lowest Price" />
<TableColumn prefWidth="99.64276123046875" styleClass="table-item" text="Refresh Delay" />
<TableColumn prefWidth="137.58929443359375" styleClass="table-item" text="Account Email" />
<TableColumn prefWidth="123.0" styleClass="table-item" text="Tools" />
</columns>
</TableView>
</children>
</AnchorPane>
project.iml
project.iml
<?xml version="1.0" encoding="UTF-8"?>
<module type="JAVA_MODULE" version="4">
<component name="NewModuleRootManager" inherit-compiler-output="true">
<exclude-output />
<content url="file://$MODULE_DIR$">
<sourceFolder url="file://$MODULE_DIR$/src" isTestSource="false" />
<sourceFolder url="file://$MODULE_DIR$/resources" type="java-resource" />
</content>
<orderEntry type="inheritedJdk" />
<orderEntry type="sourceFolder" forTests="false" />
<orderEntry type="library" name="lib" level="project" />
</component>
</module>
以下是我的文件: https://i.imgur.com/vLU7prs.png
错误消息
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:567)
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:567)
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$2(LauncherImpl.java:195)
at java.base/java.lang.Thread.run(Thread.java:835)
Caused by: java.lang.NullPointerException: Location is required.
at javafx.fxml/javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3230)
at javafx.fxml/javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3194)
at javafx.fxml/javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3163)
at javafx.fxml/javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3136)
at javafx.fxml/javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3113)
at javafx.fxml/javafx.fxml.FXMLLoader.load(FXMLLoader.java:3106)
at stockBot.Main.start(Main.java:14)
at javafx.graphics/com.sun.javafx.application.LauncherImpl.lambda$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$10(PlatformImpl.java:428)
at java.base/java.security.AccessController.doPrivileged(AccessController.java:389)
at javafx.graphics/com.sun.javafx.application.PlatformImpl.lambda$runLater$11(PlatformImpl.java:427)
at javafx.graphics/com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:96)
Exception running application stockBot.Main
推荐答案
在对 getResources()的调用中，不应包含资源".尝试用 getClass().getResource("/main.fxml")替换它，它应该可以工作(假设没有其他错误).请注意，斜杠很重要.
You should not include "resources" in the call to getResources(). Try replacing it with getClass().getResource("/main.fxml") and it should work (assuming no other errors). Note, the leading slash is important.
当前代码的状态， FXMLLoader 在 src/main/resources/resources/main.fxml 中查找文件，该文件可能不在您的文件所在的位置是.如果确实有2个名为 resources 的文件夹，则应使用 getClass().getResource("/resources/main.fxml")(同样以斜杠开头)
How your code is currently, the FXMLLoader is looking for a file at src/main/resources/resources/main.fxml, which is probably not where your file is. If you do indeed have 2 folders called resources, then you should use getClass().getResource("/resources/main.fxml") (again with the leading slash).
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