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
我尝试使用和不使用包fxmltut
。没有我得到相同的例外并在线检查。显然,javafx通过查找.
令牌并在之后获取标识符来解析import语句。所以我把它作为一个包的一部分,我仍然得到同样的错误。
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);
}
}
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");
}
}
<?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" />
答案 0 :(得分:2)
首先,您应该检查是否可以加载FXML文件。 getClass().getResource("FXMLDoc.fxml")
必须不为null且不得提供异常。
第二,正如@fabian已经说过的那样,你的FXML是不正确的。它必须只包含一个 root 标记,与其他任何XML一样。
答案 1 :(得分:1)
您的FXML格式无效。您应该拥有GridPane容器中的所有节点。
像fabian在评论中所说,确保只有一个根元素。
尝试将代码简单化,如下所示,查看应用程序是否正在运行。如果是,那么它被错误地定义为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>