java - JavaFX、Scene Builder (IntelliJ) 程序从 StackOverFlow 抛出 java.lang.reflect.InvocationTargetException
问题描述
在我的代码中,我试图为我的 Battleship 项目设置主菜单,在我将 Scene Builder 中的播放按钮分配给 MainMenu 类中的 usePlayButton 方法后,程序停止工作。这是我第一次尝试将程序链接在一起,之前我只是显示了主菜单屏幕。
有时,我收到错误“java.lang.instrument ASSERTION FAILED ***: "!errorOutstanding" with message transform method call failed at JPLISAgent.c line: 844" 但是这个错误似乎是随机发生的,没有任何已知原因. 运行调试器,在我的 MainController 类中创建 mainMenu 时,程序似乎崩溃了。我缩短了错误报告以减少帖子中使用的字符数。
错误:
Exception in Application start method
java.lang.reflect.InvocationTargetException
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at com.sun.javafx.application.LauncherImpl.launchApplicationWithArgs(LauncherImpl.java:389)
at com.sun.javafx.application.LauncherImpl.launchApplication(LauncherImpl.java:328)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at sun.launcher.LauncherHelper$FXHelper.main(LauncherHelper.java:767)
Caused by: java.lang.RuntimeException: Exception in Application start method
at com.sun.javafx.application.LauncherImpl.launchApplication1(LauncherImpl.java:917)
at com.sun.javafx.application.LauncherImpl.lambda$launchApplication$1(LauncherImpl.java:182)
at java.lang.Thread.run(Thread.java:748)
Caused by: java.lang.StackOverflowError
at java.util.HashMap.hash(HashMap.java:339)
at java.util.HashMap.get(HashMap.java:557)
at sun.misc.JarIndex.get(JarIndex.java:175)
我已经尝试了一些我从这个网站上的相关问题中看到的修复。我已将我的 src/res 文件夹设置为 IntelliJ 的资源文件夹。我尝试创建在 MainMenu 类中使用的按钮。我给了我的 AnchorPane 一个 fx:id 的 root。除其他外。
我的文件结构是:
主控制器
package controllers;
import javafx.application.Application;
import javafx.scene.Scene;
import javafx.stage.Stage;
import static javafx.fxml.FXMLLoader.load;
/**
* The Main class handles the setup of the game and loads the JavaFX features of the program.
* Main has the user choose the size of the board.
* Main handles the main menu
*
* @author Devon X. Dalrymple
* @version 2019.11.13-03
*/
public class MainController extends Application {
private static Stage game;
public MainMenu mainMenu;
public ChooseSize chooseSize;
/**
* @param primaryStage stage used to run JavaFX program
* @throws Exception thrown when the stage is not loaded correctly
*/
@Override
public void start(Stage primaryStage) throws Exception {
game = primaryStage;
mainMenu = new MainMenu();
chooseSize = new ChooseSize();
game.setTitle("Devon's Battleship");
game.setScene(mainMenu.getScene());
game.show();
}
/**
* main method that launches javaFX and loads the program
* @param args
*/
public static void main(String[] args) {
launch(args);
}
/**
* Sets the primaryStage scene to the scene provided by the parameter
* @param scene, Scene to change to
*/
public void setScene(Scene scene)
{
game.setScene(scene);
}
}
主菜单类:
package controllers;
import javafx.event.ActionEvent;
import javafx.fxml.FXML;
import javafx.fxml.FXMLLoader;
import javafx.scene.Parent;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.control.Label;
import javafx.scene.layout.AnchorPane;
import java.io.IOException;
/**
* Handles the Main Menu and its buttons
*
* @author Devon X. Dalrymple
* @version 2019.11.14-02
*/
public class MainMenu {
private Parent menu;
Scene scene;
ActionEvent eventPlay;
MainController mainController;
@FXML Button playGame;
@FXML AnchorPane root;
@FXML Label menuLabel;
@FXML Button rulesButton;
@FXML Button quitButton;
/**
* Sets up the main menu and loads the related fxml file
* @throws IOException
*/
public MainMenu() throws IOException {
playGame = new Button();
root = new AnchorPane();
menuLabel = new Label();
rulesButton = new Button();
quitButton = new Button();
mainController = new MainController();
menu = FXMLLoader.load(getClass().getResource("../res/MainMenu.fxml"));
scene = new Scene(menu);
eventPlay = new ActionEvent();
}
/**
* Returns the main menu to load as the current scene
* @return menu Main Menu of the game
*/
public Scene getScene()
{
return scene;
}
/**
* Connected using Scene Builder to change the scene whenever the play game button is clicked
* @param eventPlay
*/
public void usePlayGame(ActionEvent eventPlay)
{
mainController.setScene(mainController.chooseSize.getScene());
}
}
主菜单 fxml
<?xml version="1.0" encoding="UTF-8"?>
<?import javafx.scene.control.Button?>
<?import javafx.scene.control.Label?>
<?import javafx.scene.layout.AnchorPane?>
<?import javafx.scene.text.Font?>
<AnchorPane id="AnchorPane" fx:id="root" maxHeight="-Infinity" maxWidth="-Infinity" minHeight="-Infinity" minWidth="-Infinity" prefHeight="720.0" prefWidth="1280.0" xmlns="http://javafx.com/javafx/8.0.171" xmlns:fx="http://javafx.com/fxml/1" fx:controller="controllers.MainMenu">
<children>
<Label id="chooseSize" fx:id="menuLabel" layoutX="503.0" layoutY="101.0" text="Devon's Battleship" textAlignment="CENTER">
<font>
<Font name="System Bold" size="26.0" />
</font>
</Label>
<Button id="makeTiny" fx:id="playGame" layoutX="558.0" layoutY="256.0" mnemonicParsing="false" onAction="#usePlayGame" prefWidth="166.0" text="Play Game">
<font>
<Font size="18.0" />
</font>
</Button>
<Button id="makeTiny" fx:id="rulesButton" layoutX="558.0" layoutY="312.0" mnemonicParsing="false" prefWidth="166.0" text="How to Play">
<font>
<Font size="18.0" />
</font></Button>
<Button id="makeTiny" fx:id="quitButton" layoutX="558.0" layoutY="366.0" mnemonicParsing="false" prefWidth="166.0" text="Quit Game">
<font>
<Font size="18.0" />
</font></Button>
</children>
</AnchorPane>
选择尺寸类
package controllers;
import javafx.fxml.FXMLLoader;
import javafx.scene.Parent;
import javafx.scene.Scene;
import java.io.IOException;
/**
* Handles the Main Menu and its buttons
*
* @author Devon X. Dalrymple
* @version 2019.11.14-02
*/
public class ChooseSize {
private Parent menu;
Scene scene;
/**
* Creates the choose size scene to select board size by loading the appropriate fxml file
* @throws IOException
*/
public ChooseSize() throws IOException {
menu = FXMLLoader.load(getClass().getResource("../res/ChooseSize.fxml"));
scene = new Scene(menu);
}
/**
* Returns the main menu to load as the current scene
* @return menu Main Menu of the game
*/
public Scene getScene() {
return scene;
}
}
我正在使用这个项目来教我 JavaFX,但我不确定我是否犯了一些容易修复的错误,任何帮助将不胜感激。
解决方案
公共 MainMenu() 抛出 IOException { ... menu = FXMLLoader.load(getClass().getResource("../res/MainMenu.fxml")); ...} <... fx:controller="controllers.MainMenu">... 仅此一项就应该在加载主菜单之前导致堆栈溢出... – fabian
在看到 fabian 的评论并查看其他人如何对他们的 JavaFX 程序进行编码后,我删除了 fxml 文件中对 MainMenu 的引用,并将我的程序设置方式更改为:
主控制器
/**
* @param primaryStage stage used to run JavaFX program
* @throws Exception thrown when the stage is not loaded correctly
*/
@Override
public void start(Stage primaryStage) throws Exception {
game = primaryStage;
MainMenu mainMenu = new MainMenu();
ChooseSize chooseSize = new ChooseSize();
theMainMenu = new Scene(mainMenu.getContent());
chooseSizeMenu = new Scene(chooseSize.getContent());
game.setTitle("Devon's Battleship");
game.setScene(theMainMenu);
game.show();
}
/**
* main method that launches javaFX and loads the program
* @param args
*/
public static void main(String[] args) throws IOException {
launch(args);
}
/**
* Sets the primaryStage scene to the scene provided by the parameter
* @param sceneID, Scene to change to using its corresponding ID number
*/
public static void setScene(int sceneID)
{
if (sceneID == 0)
{
game.setScene(theMainMenu);
}
if (sceneID == 1)
{
game.setScene(chooseSizeMenu);
}
}
主菜单
/**
* Sets up the main menu and loads the related fxml file
* @throws IOException
*/
public MainMenu() throws IOException {
base = FXMLLoader.load(getClass().getResource("../res/MainMenuGUI.fxml"));
}
/**
* Returns the main menu to load as the current scene
* @return menu Main Menu of the game
*/
public Parent getContent()
{
return base;
}
/**
* Connected using Scene Builder to change the scene whenever the play game button is clicked
* @param eventPlay
*/
public void usePlayGame(ActionEvent eventPlay)
{
MainController.setScene(1); //sceneID of chooseSizeMenu
}
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