为什么我无法启动 JavaFX 程序?

Question

我的程序有一点问题。 我可以正常运行该程序，直到我给我的元素标签和操作，如"onClick"...... 有某种我无法修复的异常，所以我正在寻求您的帮助。问题只是出在我的电脑上还是代码错误？

这是您所需要的一切：

例外：

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$FXHelper.main(LauncherHelper.java:941)
Caused by: java.lang.RuntimeException: Exception in Application start method
at javafx.graphics/com.sun.javafx.application.LauncherImpl.launchApplication1(LauncherImpl.java:973)
at javafx.graphics/com.sun.javafx.application.LauncherImpl.lambda$launchApplication$2(LauncherImpl.java:198)
at java.base/java.lang.Thread.run(Thread.java:844)
Caused by: javafx.fxml.LoadException: 
/E:/programovanie/netgame/out/production/netgame/sample/sample.fxml:26
at javafx.fxml/javafx.fxml.FXMLLoader.constructLoadException(FXMLLoader.java:2625)
at javafx.fxml/javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:2603)
at javafx.fxml/javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:2466)
at javafx.fxml/javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3253)
at javafx.fxml/javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3210)
at javafx.fxml/javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3179)
at javafx.fxml/javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3152)
at javafx.fxml/javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3129)
at javafx.fxml/javafx.fxml.FXMLLoader.load(FXMLLoader.java:3122)
at sample.Main.start(Main.java:13)
at javafx.graphics/com.sun.javafx.application.LauncherImpl.lambda$launchApplication1$9(LauncherImpl.java:919)
at javafx.graphics/com.sun.javafx.application.PlatformImpl.lambda$runAndWait$11(PlatformImpl.java:449)
at javafx.graphics/com.sun.javafx.application.PlatformImpl.lambda$runLater$9(PlatformImpl.java:418)
at java.base/java.security.AccessController.doPrivileged(Native Method)
at javafx.graphics/com.sun.javafx.application.PlatformImpl.lambda$runLater$10(PlatformImpl.java:417)
at javafx.graphics/com.sun.glass.ui.InvokeLaterDispatcher$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$3(WinApplication.java:175)
... 1 more
Caused by: java.lang.IllegalArgumentException: Can not set org.w3c.dom.Text field sample.Controller.minuty to javafx.scene.text.Text
at java.base/jdk.internal.reflect.UnsafeFieldAccessorImpl.throwSetIllegalArgumentException(UnsafeFieldAccessorImpl.java:167)
at java.base/jdk.internal.reflect.UnsafeFieldAccessorImpl.throwSetIllegalArgumentException(UnsafeFieldAccessorImpl.java:171)
at java.base/jdk.internal.reflect.UnsafeObjectFieldAccessorImpl.set(UnsafeObjectFieldAccessorImpl.java:81)
at java.base/java.lang.reflect.Field.set(Field.java:780)
at javafx.fxml/javafx.fxml.FXMLLoader.injectFields(FXMLLoader.java:1174)
at javafx.fxml/javafx.fxml.FXMLLoader.access$1600(FXMLLoader.java:105)
at javafx.fxml/javafx.fxml.FXMLLoader$ValueElement.processValue(FXMLLoader.java:865)
at javafx.fxml/javafx.fxml.FXMLLoader$ValueElement.processStartElement(FXMLLoader.java:759)
at javafx.fxml/javafx.fxml.FXMLLoader.processStartElement(FXMLLoader.java:2722)
at javafx.fxml/javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:2552)
... 17 more
Exception running application sample.Main

sample.fxml ：

<?xml version="1.0" encoding="UTF-8"?>
<?import javafx.geometry.Insets?>
<?import javafx.scene.control.Button?>
<?import javafx.scene.control.Slider?>
<?import javafx.scene.layout.AnchorPane?>
<?import javafx.scene.layout.ColumnConstraints?>
<?import javafx.scene.layout.GridPane?>
<?import javafx.scene.layout.RowConstraints?>
<?import javafx.scene.text.Font?>
<?import javafx.scene.text.Text?>
<AnchorPane maxHeight="-Infinity" maxWidth="-Infinity" minHeight="-Infinity" minWidth="-Infinity" prefHeight="600.0" prefWidth="900.0" xmlns="http://javafx.com/javafx/8.0.172-ea" xmlns:fx="http://javafx.com/fxml/1" fx:controller="sample.Controller">
<children>
<GridPane minHeight="100.0" minWidth="900.0" style="-fx-background-color: #CDE8C8; -fx-border-color: black;">
<columnConstraints>
<ColumnConstraints hgrow="SOMETIMES" minWidth="10.0" prefWidth="100.0" />
<ColumnConstraints hgrow="SOMETIMES" minWidth="10.0" prefWidth="100.0" />
<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>
<Text fx:id="minuty" strokeType="OUTSIDE" strokeWidth="0.0" text="00" wrappingWidth="225.125">
<font>
<Font size="40.0" />
</font>
<GridPane.margin>
<Insets left="50.0" />
</GridPane.margin>
</Text>
<Text strokeType="OUTSIDE" strokeWidth="0.0" text=":" textAlignment="CENTER" wrappingWidth="224.671875">
<font>
<Font size="40.0" />
</font>
</Text>
<Text fx:id="sekundy" strokeType="OUTSIDE" strokeWidth="0.0" text="00" textAlignment="RIGHT" wrappingWidth="176.9375">
<font>
<Font size="40.0" />
</font>
<GridPane.margin>
<Insets />
</GridPane.margin>
</Text>
<Text fx:id="stavcerveny" fill="RED" strokeType="OUTSIDE" strokeWidth="0.0" text="0" wrappingWidth="225.5625" GridPane.columnIndex="1">
<font>
<Font size="40.0" />
</font>
<GridPane.margin>
<Insets left="50.0" />
</GridPane.margin>
</Text>
<Text strokeType="OUTSIDE" strokeWidth="0.0" text=":" textAlignment="CENTER" wrappingWidth="225.671875" GridPane.columnIndex="1">
<font>
<Font size="40.0" />
</font>
</Text>
<Text fx:id="stavmodry" fill="#0073ff" strokeType="OUTSIDE" strokeWidth="0.0" text="0" textAlignment="RIGHT" wrappingWidth="157.5625" GridPane.columnIndex="1">
<font>
<Font size="40.0" />
</font>
</Text>
<Button alignment="CENTER" mnemonicParsing="false" onMouseClicked="#zapnutie" prefHeight="25.0" prefWidth="226.0" text="PLAY" GridPane.columnIndex="2">
<GridPane.margin>
<Insets bottom="40.0" left="40.0" right="40.0" />
</GridPane.margin>
</Button>
<Button mnemonicParsing="false" onMouseClicked="#restart" prefHeight="25.0" prefWidth="227.0" text="RESTART" textAlignment="CENTER" GridPane.columnIndex="2">
<opaqueInsets>
<Insets />
</opaqueInsets>
<GridPane.margin>
<Insets left="40.0" right="40.0" top="50.0" />
</GridPane.margin>
</Button>
<Slider fx:id="obtiazne" prefHeight="14.0" prefWidth="126.0" GridPane.columnIndex="3">
<GridPane.margin>
<Insets left="20.0" right="20.0" />
</GridPane.margin>
</Slider>
</children>
</GridPane>
<AnchorPane fx:id="hra" layoutY="100.0" prefHeight="500.0" prefWidth="900.0" />
</children>
</AnchorPane>

控制器.java ：

package sample;
import javafx.fxml.FXML;
import javafx.scene.control.Slider;
import javafx.scene.input.MouseEvent;
import javafx.scene.layout.AnchorPane;
import org.w3c.dom.Text;
public class Controller {
@FXML
Slider obtiazne;
@FXML
Text minuty;
@FXML
Text sekundy;
@FXML
Text stavcerveny;
@FXML
Text stavmodry;
@FXML
AnchorPane hra;
public void zapnutie(MouseEvent mouseEvent) {
System.out.println(obtiazne.getValue());
}
public void restart(MouseEvent mouseEvent) {
}
}

主要.java ：

package sample;
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("sample.fxml"));
primaryStage.setTitle("Hello World");
primaryStage.setScene(new Scene(root));
primaryStage.show();
}

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

我认为正确的行是：

"在样品。Main.start(Main.java：13(">

那就是："父根目录 = FXMLLoader.load(getClass((.getResource("sample.fxml"((;

我不明白其余部分，所以我希望你能轻松解决问题:)

Answer 1

堆栈跟踪的相关部分是

无法设置 org.w3c.dom.Text 字段示例。Controller.minuty to javafx.scene.text.text

这意味着您的导入在控制器类中是错误的

将import org.w3c.dom.Text;更改为import javafx.scene.text.Text;