In my code, I am trying to set up the main menu for my Battleship project and after I assigned the play button in Scene Builder to the usePlayButton method in my MainMenu class, the program stopped working. This is the first time I tried linking the program together and previously I just showed the main menu screen.
Occasionally, I receive the error, "java.lang.instrument ASSERTION FAILED ***: "!errorOutstanding" with message transform method call failed at JPLISAgent.c line: 844" However this error seems to happen at random, without any known reason. Running the debugger, the program seems to crash when creating mainMenu in my MainController class. I have shortened the bug report to lower the number of characters used in the post.
Error:
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)
I've tried some of the fixes I've seen from related questions on this site. I have set my src/res folder to be seen as a resources folder by IntelliJ. I have tried creating the button used inside my MainMenu class. I have given my AnchorPane an fx:id of root. Among other things along the way.
My file structure is:
MainController
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);
}
}
MainMenu class:
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());
}
}
MainMenu 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>
ChooseSize class
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;
}
}
I am using this project to teach me JavaFX and I'm not sure if I made some easy to fix mistake, any help would greatly be appreciated.
public MainMenu() throws IOException { ... menu = FXMLLoader.load(getClass().getResource("../res/MainMenu.fxml")); ...}<... fx:controller="controllers.MainMenu">... This alone should result in an stackoverflow even before you get the main menu loaded... - fabian