应用程序启动方法中的 Javafx 错误异常未指定控制器
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时间：2020-08-11 09:23:59 来源:igfitidea点击:
Javafx error exception in Application start method no controller specified
提问by
When I run the following code in intellij with java 8 I get an error. Please Help. The fxml is generated using the scene builder, I think the button Dagrooster isn't linked with the method.
当我使用 java 8 在 intellij 中运行以下代码时，出现错误。请帮忙。fxml 是使用场景构建器生成的，我认为按钮 Dagrooster 未与该方法链接。
package Weert;
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("Weert.fxml"));
primaryStage.setTitle("test");
primaryStage.setScene(new Scene(root, 300, 275));
primaryStage.show();
}
public static void main(String[] args) {
launch(args);
}
}
Weert.fxml:
Weert.fxml：
<?xml version="1.0" encoding="UTF-8"?>
<?import javafx.scene.web.*?>
<?import javafx.scene.control.*?>
<?import java.lang.*?>
<?import javafx.scene.layout.*?>
<?import javafx.geometry.Insets?>
<?import javafx.scene.layout.GridPane?>
<?import javafx.scene.control.Button?>
<?import javafx.scene.control.Label?>
<BorderPane maxHeight="1.7976931348623157E308" maxWidth="1.7976931348623157E308" prefHeight="400.0" prefWidth="600.0" xmlns="http://javafx.com/javafx/8" xmlns:fx="http://javafx.com/fxml/1">
<top>
<GridPane alignment="TOP_CENTER" BorderPane.alignment="CENTER">
<columnConstraints>
<ColumnConstraints halignment="CENTER" hgrow="SOMETIMES" minWidth="10.0" prefWidth="100.0" />
<ColumnConstraints halignment="CENTER" hgrow="SOMETIMES" minWidth="10.0" prefWidth="100.0" />
<ColumnConstraints halignment="CENTER" hgrow="SOMETIMES" minWidth="10.0" prefWidth="100.0" />
</columnConstraints>
<rowConstraints>
<RowConstraints minHeight="10.0" prefHeight="30.0" vgrow="SOMETIMES" />
</rowConstraints>
<children>
<Button fx:id="btnDagrooster" alignment="TOP_CENTER" contentDisplay="CENTER" maxWidth="1.7976931348623157E308" mnemonicParsing="false" onAction="#Dagrooster" text="Dagrooster" textAlignment="CENTER" GridPane.columnIndex="0" />
<Button fx:id="btnHuidigRooster" alignment="TOP_CENTER" contentDisplay="CENTER" maxWidth="1.7976931348623157E308" mnemonicParsing="false" text="Huidig Rooster" textAlignment="CENTER" GridPane.columnIndex="1" />
<Button fx:id="btnNieuwRooster" alignment="TOP_CENTER" contentDisplay="CENTER" maxWidth="1.7976931348623157E308" mnemonicParsing="false" text="Nieuw Rooster" textAlignment="CENTER" GridPane.columnIndex="2" />
</children>
</GridPane>
</top>
<bottom>
<GridPane BorderPane.alignment="CENTER">
<columnConstraints>
<ColumnConstraints hgrow="SOMETIMES" minWidth="10.0" prefWidth="100.0" />
<ColumnConstraints hgrow="SOMETIMES" minWidth="10.0" prefWidth="100.0" />
</columnConstraints>
<rowConstraints>
<RowConstraints minHeight="10.0" prefHeight="30.0" vgrow="SOMETIMES" />
</rowConstraints>
<children>
<Button alignment="TOP_CENTER" contentDisplay="CENTER" maxWidth="1.7976931348623157E308" mnemonicParsing="false" text="Instellingen" textAlignment="CENTER" />
<Button alignment="TOP_CENTER" contentDisplay="CENTER" layoutX="10.0" layoutY="13.0" maxWidth="1.7976931348623157E308" mnemonicParsing="false" text="Laden..." textAlignment="CENTER" GridPane.columnIndex="1" />
</children>
</GridPane>
</bottom>
<center>
<WebView prefHeight="200.0" prefWidth="200.0" BorderPane.alignment="CENTER" />
</center>
</BorderPane>
Controller.java:
控制器.java：
package Weert;
import javafx.fxml.FXML;
import javafx.fxml.Initializable;
import javafx.event.ActionEvent;
import java.net.URL;
import java.util.ResourceBundle;
public class Controller implements Initializable
{
@Override
public void initialize(URL url, ResourceBundle resourceBundle)
{
}
@FXML
public void Dagrooster(ActionEvent event)
{
System.out.println("lollolol");
}
}
Error:
错误：
Exception in Application start method
Exception in thread "main" 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$launchApplication2(LauncherImpl.java:182)
at com.sun.javafx.application.LauncherImpl$$Lambda/381259350.run(Unknown Source)
at java.lang.Thread.run(Thread.java:745)
Caused by: javafx.fxml.LoadException: No controller specified.
/F:/foo/Weert.fxml:24
at javafx.fxml.FXMLLoader.constructLoadException(FXMLLoader.java:2601)
at javafx.fxml.FXMLLoader.access0(FXMLLoader.java:104)
at javafx.fxml.FXMLLoader$Element.getControllerMethodHandle(FXMLLoader.java:553)
at javafx.fxml.FXMLLoader$Element.processEventHandlerAttributes(FXMLLoader.java:595)
at javafx.fxml.FXMLLoader$ValueElement.processEndElement(FXMLLoader.java:766)
at javafx.fxml.FXMLLoader.processEndElement(FXMLLoader.java:2827)
at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:2536)
at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:2445)
at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3218)
at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3179)
at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3152)
at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3128)
at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3108)
at javafx.fxml.FXMLLoader.load(FXMLLoader.java:3101)
at Weert.Main.start(Main.java:13)
at com.sun.javafx.application.LauncherImpl.lambda$launchApplication19(LauncherImpl.java:863)
at com.sun.javafx.application.LauncherImpl$$Lambda/826215799.run(Unknown Source)
at com.sun.javafx.application.PlatformImpl.lambda$runAndWait2(PlatformImpl.java:326)
at com.sun.javafx.application.PlatformImpl$$Lambda/1784984253.run(Unknown Source)
at com.sun.javafx.application.PlatformImpl.lambda$null0(PlatformImpl.java:295)
at com.sun.javafx.application.PlatformImpl$$Lambda/965429099.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at com.sun.javafx.application.PlatformImpl.lambda$runLater1(PlatformImpl.java:294)
at com.sun.javafx.application.PlatformImpl$$Lambda/1334999168.run(Unknown Source)
at com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:95)
at com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
at com.sun.glass.ui.win.WinApplication.lambda$null5(WinApplication.java:101)
at com.sun.glass.ui.win.WinApplication$$Lambda/184875764.run(Unknown Source)
... 1 more
采纳答案by ItachiUchiha
The error says it, the FXML is missing the fx:controllerdeclaration. Add the controller declaration to BorderPanedeclaration as shown :
错误表明，FXML 缺少fx:controller声明。将控制器声明添加到BorderPane声明中，如下所示：
...
<BorderPane maxHeight="1.7976931348623157E308"
maxWidth="1.7976931348623157E308" prefHeight="400.0"
prefWidth="600.0" xmlns="http://javafx.com/javafx/8"
xmlns:fx="http://javafx.com/fxml/1"
fx:controller="Weert.Controller">
...
To know how to set controller class via SceneBuilder, you can have a look at this question.
要了解如何通过 SceneBuilder 设置控制器类，您可以查看这个问题。
回答by Dila Gurung
As the error implies, problem is in "fxml", in which it is referring to class which do not exist. To solve this search an attribute called "fx:controller" and assign it qualified class name . For an instance "fx:controller="packagename.className".
正如错误所暗示的那样，问题出在“fxml”中，它指的是不存在的类。为了解决这个问题，搜索一个名为“fx:controller”的属性并为其分配限定的类名。例如“fx:controller="packagename.className”。
回答by Adam Omar
It is true you havent told the fxml file where the controller class is...
你确实没有告诉 fxml 文件控制器类在哪里......
this ...
这个 ...
<BorderPane maxHeight="1.7976931348623157E308" maxWidth="1.7976931348623157E308" prefHeight="400.0" prefWidth="600.0" xmlns="http://javafx.com/javafx/8" xmlns:fx="http://javafx.com/fxml/1">
As this...
由于这...
<BorderPane maxHeight="1.7976931348623157E308" maxWidth="1.7976931348623157E308" prefHeight="400.0" prefWidth="600.0" xmlns="http://javafx.com/javafx/8" xmlns:fx="http://javafx.com/fxml/1" fx:controller="Weert.Controller">
Or even this...
甚至这...
<BorderPane maxHeight="1.7976931348623157E308" maxWidth="1.7976931348623157E308" prefHeight="400.0" prefWidth="600.0" xmlns="http://javafx.com/javafx/8" xmlns:fx="http://javafx.com/fxml/1" fx:controller="Controller">
.. then put both files in the same folder
..然后将两个文件放在同一个文件夹中
