FXML ClassNotFoundException

Question

错误

C:\Users\rbenedict\Documents\Java Modules>java -cp .;fxmltut fxmltut.FXMLEx
Exception in Application start method
java.lang.reflect.InvocationTargetException
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
        at java.lang.reflect.Method.invoke(Unknown Source)
        at com.sun.javafx.application.LauncherImpl.launchApplicationWithArgs(Unk
nown Source)
        at com.sun.javafx.application.LauncherImpl.launchApplication(Unknown Sou
rce)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
        at java.lang.reflect.Method.invoke(Unknown Source)
        at sun.launcher.LauncherHelper$FXHelper.main(Unknown Source)
Caused by: java.lang.RuntimeException: Exception in Application start method
        at com.sun.javafx.application.LauncherImpl.launchApplication1(Unknown So
urce)
        at com.sun.javafx.application.LauncherImpl.lambda$launchApplication$155(
Unknown Source)
        at java.lang.Thread.run(Unknown Source)
Caused by: javafx.fxml.LoadException:
/C:/Users/rbenedict/Documents/Java%20Modules/fxmltut/FXMLDoc.fxml

        at javafx.fxml.FXMLLoader.constructLoadException(Unknown Source)
        at javafx.fxml.FXMLLoader.importClass(Unknown Source)
        at javafx.fxml.FXMLLoader.processImport(Unknown Source)
        at javafx.fxml.FXMLLoader.processProcessingInstruction(Unknown Source)
        at javafx.fxml.FXMLLoader.loadImpl(Unknown Source)
        at javafx.fxml.FXMLLoader.loadImpl(Unknown Source)
        at javafx.fxml.FXMLLoader.loadImpl(Unknown Source)
        at javafx.fxml.FXMLLoader.loadImpl(Unknown Source)
        at javafx.fxml.FXMLLoader.loadImpl(Unknown Source)
        at javafx.fxml.FXMLLoader.loadImpl(Unknown Source)
        at javafx.fxml.FXMLLoader.loadImpl(Unknown Source)
        at javafx.fxml.FXMLLoader.load(Unknown Source)
        at fxmltut.FXMLEx.start(FXMLEx.java:17)
        at com.sun.javafx.application.LauncherImpl.lambda$launchApplication1$162
(Unknown Source)
        at com.sun.javafx.application.PlatformImpl.lambda$runAndWait$175(Unknown
 Source)
        at com.sun.javafx.application.PlatformImpl.lambda$null$173(Unknown Sourc
e)
        at java.security.AccessController.doPrivileged(Native Method)
        at com.sun.javafx.application.PlatformImpl.lambda$runLater$174(Unknown S
ource)
        at com.sun.glass.ui.InvokeLaterDispatcher$Future.run(Unknown Source)
        at com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
        at com.sun.glass.ui.win.WinApplication.lambda$null$148(Unknown Source)
        ... 1 more
Caused by: java.lang.ClassNotFoundException
        at javafx.fxml.FXMLLoader.loadType(Unknown Source)
        ... 21 more
Exception running application fxmltut.FXMLEx

我试着用和不带包fxmltut。没有得到同样的例外，我做了一些在线检查。显然，javafx通过查找.令牌和后面的标识符来解析导入语句。所以我把它作为包的一部分，我仍然收到同样的错误。

FXMLEx.java

package fxmltut;

import javafx.application.Application;
import javafx.scene.Scene;
import javafx.stage.Stage;

import javafx.scene.Parent;
import java.lang.Class;

import javafx.fxml.FXMLLoader;

public class FXMLEx extends Application {

    @Override
    public void start(Stage stage) throws Exception {

        Parent root = FXMLLoader.load(getClass().getResource("FXMLDoc.fxml"));
        Scene scene = new Scene(root, 300,275);

        stage.setTitle("FXML Welcome");
        stage.setScene(scene);
        stage.show();

    }

    public static void main(String[] args) {
        launch(args);
    }

}

FXMLCont.java

package fxmltut;

import javafx.event.ActionEvent;
import javafx.fxml.FXML;
import javafx.scene.text.Text;

public class FXMLCont {
    @FXML private Text actTarg;
    @FXML protected void handleSubmitButtonAction(ActionEvent event) {
        actTarg.setText("Sign in button pressed");
    }
}

FXMLDoc.fxml

<?xml version="1.0" encoding="UTF-8"?>

<?import fxmltut.*?>
<?import java.net.*?>
<?import java.geometry.*?>
<?import java.scene.control*?>
<?import java.scene.layout.*?>
<?import java.scene.text.*?>

<GridPane fx:controller="fxmltut.FXMLCont"

    xmlns:fx="http://javafx.com/fxml" alignment="center" hgap="10" vgap="10">
    <padding><Insets top="25" right="25" bottom="25" left="25"/></padding>

</GridPane>

<Text text="Welcome"
    GridePane.columnIndex="0" GridPane.rowIndex="0"
    GridPane.columnSpan="2"/>

<Label text="User Name:"
    GridPane.columnIndex="0" GridPane.rowIndex="1"/>
<TextField
    GridPane.columnIndex="1" GridPane.rowIndex="1"/>

<Label text="Password:"
    GridPane.columnIndex="0" GridPane.rowIndex="2"/>

<PasswordField fx:id="pw" GridPane.columnIndex="1" GridPane.rowIndex="2"/>

<HBox spacing="10" alignment = "bottom_right"
    GridPane.columnIndex="1" GridPane.rowIndex="4">

    <Button text="Sign in"
    onAction="#handleSubmitButtonAction"/>

</HBox>

<Text fx:id="actTarg"
    GridPane.columnIndex="0" GridPane.columnSpan="2"
    GridPane.halignment="RIGHT" GridPane.rowIndex="6" />

Answer 1

首先，您应该检查是否可以加载FXML文件。getClass().getResource("FXMLDoc.fxml")必须不是null，并且不能提供任何例外。

第二，正如@fabian已经说过的，您的FXML格式不正确。它必须与任何其他一样只包含一个根标记。

Answer 2

您的FXML格式无效。您应该在GridPane容器中拥有所有节点。

正如法比安在评论中所说，确保有一个单一的根元素。

试着将代码简单地放在下面，看看应用程序是否正在运行。如果是，那么它被错误地定义了fxml文件布局。

<?xml version="1.0" encoding="UTF-8"?>

<?import java.lang.*?>
<?import javafx.scene.layout.*?>
<?import javafx.scene.layout.BorderPane?>

<GridPane maxHeight="-Infinity" maxWidth="-Infinity" minHeight="-Infinity" minWidth="-Infinity" prefHeight="377.0" prefWidth="533.0" xmlns:fx="http://javafx.com/fxml/1" xmlns="http://javafx.com/javafx/8" fx:controller="fxmltut.FXMLCont">

</GridPane>