how to add an object in java lang to the fxml file

Question

im trying to make a game I have made a grid of cells in a java class and another part of the UI in the fxml file but when I run it ide gives: JavaFX Application Thread" java.lang.RuntimeException: ...

Accepted Answer

Yes, James_D get the point. I tested your code and with a few tweaks it worked. Look:Main.javapackage application;import controller.InitializePageController;import javafx.application.Application;import javafx.stage.Stage;public class Main extends Application { @Override public void start(Stage primaryStage) { try { InitializePageController startApp = new InitializePageController(); startApp.pageDimensions(); } catch(Exception e) { e.printStackTrace(); } } public static void main(String[] args) { launch(args); }}DataModel.javapackage model;public class DataModel { public static int gridHeight; public static int gridWidth; public static String name1; public static String name2; public static int row; public static int column;}UserGrid.java (fixing StackOverflow Exception)package action;import javafx.beans.value.ChangeListener;import javafx.beans.value.ObservableValue;import javafx.fxml.FXML;import javafx.scene.Node;import javafx.scene.layout.Pane;import javafx.scene.layout.StackPane;import model.DataModel;public class UserGrid extends Pane { static int row; static int column; static int height; static int width; static boolean star; static boolean wall; @FXML StackPane gridRoot; gridCell [][] boardCells; public void init() { try { UserGrid actualGrid = new UserGrid(); UserGrid.row = DataModel.row; UserGrid.column = DataModel.column; UserGrid.star = false; UserGrid.wall = false; UserGrid.width = DataModel.gridWidth; UserGrid.height = DataModel.gridHeight; actualGrid.boardCells = new gridCell[row][column]; MouseGesture M = new MouseGesture(); for (int y = 0; y < UserGrid.row; y++) { for (int x = 0; x < UserGrid.column; x++) { gridCell cell = new gridCell(y, x, false, false); M.paint(cell); actualGrid.add(cell, row, column); } } gridRoot.getChildren().add(actualGrid); } catch (Exception e){ e.getCause(); System.out.println("check"); e.printStackTrace(); } } public void add(gridCell cell,int row,int column){ int cellWidth = UserGrid.width/UserGrid.column; int cellHeight = UserGrid.height/UserGrid.row; int x = cellWidth*column; int y= cellHeight*row; boardCells[x][y] = cell; cell.setPrefSize(cellWidth,cellHeight); cell.setTranslateX(x); cell.setTranslateY(y); getChildren().add(cell); } public gridCell getCell(int x,int y){ return boardCells[x][y]; } public class gridCell extends StackPane{ int row; int column; boolean star; boolean wall; public gridCell(int row,int column,boolean star,boolean wall){ this.star=star; this.wall=wall; this.row=row; this.column=column; getStyleClass().add("cell"); } public void makeStar(){ getStyleClass().remove("cell-highlight"); getStyleClass().add("cell-star-highlight"); } public void makeSmileyFace(int n){ if(n==1){ getStyleClass().remove("cell-highlight"); getStyleClass().add("cell-smiley1-highlight"); }else if(n==2){ getStyleClass().remove("cell-smile2-highlight"); getStyleClass().add("cell-smiley2-highlight"); } } public void makeWall(){ getStyleClass().remove("cell-wall-highlight"); getStyleClass().add("cell-wall-highlight"); } public void cellHover(){ getStyleClass().remove("cell-hover-highlight"); getStyleClass().add("cell-hover-highlight"); } public void RemoveStar(){ getStyleClass().remove("cell-highlight"); getStyleClass().add("cell-star-highlight"); } public void RemoveSmileyFace(int n){ if(n==1){ getStyleClass().remove("cell-highlight"); }else if(n==2){ getStyleClass().remove("cell-smile2-highlight"); } } public void RemoveWall(){ getStyleClass().remove("cell-wall-highlight"); } public void UnhighlightHover(){ getStyleClass().remove("cell-hover-highlight"); } public String toString() { return this.column + "C||R" + this.row; } } public class MouseGesture{ public void paint(Node node){ if(true){ node.hoverProperty().addListener(new ChangeListener(){ @Override public void changed(ObservableValue observable, Boolean oldValue, Boolean newValue){ System.out.println( observable + ": " + newValue); if(newValue) { ((gridCell) node).cellHover(); } else { ((gridCell) node).UnhighlightHover(); } for(String s: node.getStyleClass()){ System.out.println( node + ": " + s); } } }); } } }}InitializerPageController.javapackage controller;import java.io.IOException;import javafx.fxml.FXML;import javafx.fxml.FXMLLoader;import javafx.scene.Parent;import javafx.scene.Scene;import javafx.scene.control.TextField;import javafx.stage.Stage;import model.DataModel;public class InitializePageController { @FXML TextField GridWidth; @FXML TextField GridHeight; @FXML TextField row; @FXML TextField column; @FXML TextField name1; @FXML TextField name2; Parent root; Stage stage = new Stage(); public void pageDimensions() throws IOException { /*int gHeight =Integer.parseInt(GridHeight.getText()); int gWidth = Integer.parseInt(GridWidth.getText()); int rrow = Integer.parseInt(row.getText()); int ccolumn = Integer.parseInt(column.getText());*/ int gHeight =Integer.parseInt("50"); int gWidth = Integer.parseInt("50"); int rrow = Integer.parseInt("25"); int ccolumn = Integer.parseInt("25"); DataModel.gridHeight=gHeight; DataModel.gridWidth=gWidth; DataModel.row=rrow; DataModel.column=ccolumn; try { System.out.println("Dimension Happened"); //System.out.println( gHeight); System.out.println("AIMING FOR GRID"); try { root = FXMLLoader.load(getClass().getResource("../GridInitializer.fxml")); //stage = (Stage) row.getScene().getWindow(); //Scene scene = new Scene(root, DataModel.gridWidth, DataModel.gridHeight); Scene scene = new Scene(root,800,800); stage.setScene(scene); stage.setTitle("please god "); stage.show(); } catch (Exception e) { System.out.println("grid initiakizer went wring /init.page controller"); e.printStackTrace(); } } catch (Exception ex){ System.out.println("101"); ex.getCause(); System.out.println("101"); } }}GridInitializer.fxml userGrid.css.cell{ -fx-background-color: rgb(38,38,38); -fx-border-color: red; -fx-border-width: 1px;}.cell-highlight { -fx-background-color:derive(blue,0.9);}.cell-hover-highlight { -fx-background-color:derive(green,0.9);}.cell-star-highlight{ -fx-background-color: derive(yellow,1%); -fx-shape: "M 100 0 L175 200 L0 75 L200 75 L25 200 Z";}.cell-smily1-highlight{ -fx-shape: "M2 1 h1 v1 h1 v1 h-1 v1 h-1 v-1 h-1 v-1 h1 z"; -fx-background-color: derive(red,10%);}.cell-smily2-highlight{ -fx-background-color: derive(blue,10%); -fx-shape: "M2 1 h1 v1 h1 v1 h-1 v1 h-1 v-1 h-1 v-1 h1 z";}.cell-wall-highlight{}And finally the project structureHope it helps!

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