JavaFX not launching

Question

I'm trying to launch up a project in JavaFX and am pretty lost at what I'm doing wrong.

The Main

package Software1C482;

/*
 * This program is explicitly for the use of Western Governers University's 
 * Software 1 submission by Andrew Whited.
 */


import java.io.IOException;
import javafx.application.Application;
import javafx.fxml.FXMLLoader;
import javafx.scene.Scene;
import javafx.scene.layout.AnchorPane;
import javafx.stage.Stage;
import ViewController.HomeWindowController;

/**
 *
 * @author Andrew Whited
 */
public class InventorySystem extends Application {
    private AnchorPane MainScreenView;
    private FXMLLoader viewLoader;

    public void initMainScreen(Stage window) throws IOException{

        viewLoader = new FXMLLoader();
        viewLoader.setLocation(InventorySystem.class.getResource("/ViewController/HomeWindow.fxml"));
        MainScreenView = viewLoader.load();

        Scene scene = new Scene(MainScreenView);

        window.setScene(scene);
        window.show();
    }

    public void showMainScreen() throws IOException{
        HomeWindowController controller = viewLoader.getController();
        controller.setMainApp(this);
    }

    @Override
    public void start(Stage primaryStage) throws Exception {
        primaryStage.setTitle("Inventory Mangement System"); 
        initMainScreen(primaryStage);
        showMainScreen();

    }

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

The correlated files are as following.

HomeWindowController:

package ViewController;

import Model.Inventory;
import static Model.Inventory.getPartInventory;
import static Model.Inventory.getProductInventory;
import static Model.Inventory.removePart;
import static Model.Inventory.removeProduct;
import static Model.Inventory.validatePartDelete;
import Model.Part;
import Model.Product;
import Software1C482.InventorySystem;
import java.io.IOException;
import java.net.URL;
import java.util.Optional;
import java.util.ResourceBundle;
import javafx.collections.FXCollections;
import javafx.collections.ObservableList;
import javafx.event.ActionEvent;
import javafx.fxml.FXML;
import javafx.fxml.FXMLLoader;
import javafx.fxml.Initializable;
import javafx.scene.Node;
import javafx.scene.Parent;
import javafx.scene.Scene;
import javafx.scene.control.Alert;
import javafx.scene.control.Alert.AlertType;

import javafx.scene.control.Button;
import javafx.scene.control.ButtonType;
import javafx.scene.control.TableColumn;
import javafx.scene.control.TableView;
import javafx.scene.control.TextField;
import javafx.stage.Modality;
import javafx.stage.Stage;
/**
 * FXML Controller class
 *
 * @author Andrew
 */

//It's the home window.
public class HomeWindowController implements Initializable {

//Declaring the FXML parts.
    @FXML
    private TableView<Product> TableProduct;
    @FXML
    private TableColumn<Product, Integer> ProductID, ProductInventoryLevel;
    @FXML
    private TableColumn<Product, String> ProductName;
    @FXML
    private TableColumn<Product, Double> ProductPPU;
    @FXML
    private Button ButtonProductAdd;
    @FXML
    private Button ButtonProductModify;
    @FXML
    private Button ButtonProductDelete;
    @FXML
    private Button ButtonPartSearch;
    @FXML
    private TableView<Part> TablePart;
    @FXML
    private TableColumn<Part, Integer> PartID, PartInventoryLevel;
    @FXML
    private TableColumn<Part, String> PartName;
    @FXML
    private TableColumn<Part, Double> PartPPU;
    @FXML
    private TextField SearchFieldPart;
    @FXML
    private TextField SearchFieldProduct;

    private static Part modifyPart;
    private static int modifyPartIndex;
    private static Product modifyProduct;
    private static int modifyProductIndex;

    public static int partToModifyIndex() {
        return modifyPartIndex;
    }

    public static int productToModifyIndex() {
        return modifyProductIndex;
    }

    public HomeWindowController() {
    }

    @FXML
    void HomeExitClick(ActionEvent event) {

        Alert alert = new Alert(Alert.AlertType.CONFIRMATION);
        alert.initModality(Modality.NONE);
        alert.setTitle("Confirmation");
        alert.setHeaderText("Confirm Exit");
        alert.setContentText("Are you sure you want to exit?");
        Optional<ButtonType> result = alert.showAndWait();

        if (result.get() == ButtonType.OK) {
            System.exit(0);
        } else {
            System.out.println("Please resume completing form.");
        }
    }

    @FXML
    void HomeAddPartsClick(ActionEvent event) throws IOException {

        Parent addParts = FXMLLoader.load(getClass().getResource("AddParts.fxml"));
        Scene scene = new Scene(addParts);
        Stage window = (Stage) ((Node) event.getSource()).getScene().getWindow();
        window.setScene(scene);
        window.show();
    }

    @FXML
    void HomeAddProductsClick(ActionEvent event) throws IOException {

        Parent addProducts = FXMLLoader.load(getClass().getResource("AddProducts.fxml"));
        Scene scene = new Scene(addProducts);
        Stage window = (Stage) ((Node) event.getSource()).getScene().getWindow();
        window.setScene(scene);
        window.show();
    }

    @FXML
    void HomeModifyPartsClick(ActionEvent event) throws IOException {

        modifyPart = TablePart.getSelectionModel().getSelectedItem();
        modifyPartIndex = getPartInventory().indexOf(modifyPart);
        Parent modifyParts = FXMLLoader.load(getClass().getResource("ModifyParts.fxml"));
        Scene scene = new Scene(modifyParts);
        Stage window = (Stage) ((Node) event.getSource()).getScene().getWindow();
        window.setScene(scene);
        window.show();
    }

    @FXML
    void HomeModifyProductsClick(ActionEvent event) throws IOException {

        modifyProduct = TableProduct.getSelectionModel().getSelectedItem();
        modifyProductIndex = getProductInventory().indexOf(modifyProduct);
        Parent modifyProducts = FXMLLoader.load(getClass().getResource("ModifyProducts.fxml"));
        Scene scene = new Scene(modifyProducts);
        Stage window = (Stage) ((Node) event.getSource()).getScene().getWindow();
        window.setScene(scene);
        window.show();
    }

    @FXML
    void HomeSearchProductsBtn(ActionEvent event) throws IOException {
        String searchProd = SearchFieldProduct.getText();
        int prodIndex = -1;
        if (Inventory.lookupProduct(searchProd) == -1) {
            Alert alert = new Alert(AlertType.INFORMATION);
            alert.setTitle("Search Error");
            alert.setHeaderText("Product not found.");
            alert.setContentText("The text entered does not match any Product.");
            alert.showAndWait();
        } else {
            prodIndex = Inventory.lookupProduct(searchProd);
            Product tempProd = Inventory.getProductInventory().get(prodIndex);
            ObservableList<Product> tempProdList = FXCollections.observableArrayList();
            tempProdList.add(tempProd);
            TableProduct.setItems(tempProdList);
        }
    }

    @FXML
    void HomeDeleteProductsClick(ActionEvent event) throws IOException {
        Product product = TableProduct.getSelectionModel().getSelectedItem();
        Alert alert = new Alert(AlertType.CONFIRMATION);
        alert.initModality(Modality.NONE);
        alert.setTitle("Confirm Delete");
        alert.setHeaderText("Confirm?");
        alert.setContentText("Are you sure you want to delete " + product.getProductName() + "?");
        Optional<ButtonType> result = alert.showAndWait();
        if (result.get() == ButtonType.OK) {
            removeProduct(product);
            updateProductTableView();
            System.out.println("Product " + product.getProductName() + " was removed.");
        } else {
            System.out.println("Product " + product.getProductName() + " was not removed.");
        }
    }

    @FXML
    void PartSearchOnAction(ActionEvent event) throws IOException {
        String searchPart = SearchFieldPart.getText();
        int partIndex = -1;
        if (Inventory.lookupPart(searchPart) == -1) {
            Alert alert = new Alert(AlertType.INFORMATION);
            alert.setTitle("Search Error");
            alert.setHeaderText("Part not found.");
            alert.setContentText("The text entered does not match any Part.");
            alert.showAndWait();
        } else {
            partIndex = Inventory.lookupPart(searchPart);
            Part tempPart = Inventory.getPartInventory().get(partIndex);
            ObservableList<Part> tempProdList = FXCollections.observableArrayList();
            tempProdList.add(tempPart);
            TablePart.setItems(tempProdList);
        }
    }

    @FXML
    void HomeDeletePartsClick(ActionEvent event) throws IOException {
        Part part = TablePart.getSelectionModel().getSelectedItem();
        if (validatePartDelete(part)) {
            Alert alert = new Alert(AlertType.INFORMATION);
            alert.setTitle("Part Delete Error.");
            alert.setHeaderText("Part cannot be removed.");
            alert.setContentText("This part is used in a product.");
            alert.showAndWait();
        } else {
            Alert alert = new Alert(AlertType.CONFIRMATION);
            alert.initModality(Modality.NONE);
            alert.setTitle("Product Delete");
            alert.setHeaderText("Confirm?");
            alert.setContentText("Are you sure you want to delete " + part.getPartName() + "?");
            Optional<ButtonType> result = alert.showAndWait();

            if (result.get() == ButtonType.OK) {
                removePart(part);
                updatePartTableView();
                System.out.println("Part " + part.getPartName() + " was removed.");
            } else {
                System.out.println("Part " + part.getPartName() + " was not removed.");
            }
        }
    }

    @Override
    public void initialize(URL url, ResourceBundle rb) {
        PartID.setCellValueFactory(cellData -> cellData.getValue().partIDProperty().asObject());
        PartName.setCellValueFactory(cellData -> cellData.getValue().partNameProperty());
        PartInventoryLevel.setCellValueFactory(cellData -> cellData.getValue().partInvProperty().asObject());
        PartPPU.setCellValueFactory(cellData -> cellData.getValue().partPriceProperty().asObject());
        ProductID.setCellValueFactory(cellData -> cellData.getValue().productIDProperty().asObject());
        ProductName.setCellValueFactory(cellData -> cellData.getValue().productNameProperty());
        ProductInventoryLevel.setCellValueFactory(cellData -> cellData.getValue().productInvProperty().asObject());
        ProductPPU.setCellValueFactory(cellData -> cellData.getValue().productPriceProperty().asObject());
        updatePartTableView();
        updateProductTableView();
    }

    public void updatePartTableView() {
        TablePart.setItems(getPartInventory());
    }

    public void updateProductTableView() {
        TableProduct.setItems(getProductInventory());
    }

    public void setMainApp(InventorySystem mainApp) {
        updatePartTableView();
        updateProductTableView();
    }
}

And lastly HomeWindow.FXML

<?xml version="1.0" encoding="UTF-8"?>

<?import javafx.scene.Scene?>
<?import javafx.scene.control.Button?>
<?import javafx.scene.control.Label?>
<?import javafx.scene.control.TableColumn?>
<?import javafx.scene.control.TableView?>
<?import javafx.scene.control.TextField?>
<?import javafx.scene.layout.AnchorPane?>
<?import javafx.scene.shape.Rectangle?>
<?import javafx.scene.text.Font?>
<?import javafx.stage.Stage?>

<Stage xmlns="http://javafx.com/javafx/11.0.1" xmlns:fx="http://javafx.com/fxml/1" fx:controller="ViewController.HomeWindowController">
    <scene>
        <Scene>
            <AnchorPane prefHeight="450.0" prefWidth="941.0">
            <children>
               <Label layoutX="40.0" layoutY="53.0" text="Inventory Management System">
                  <font>
                     <Font size="18.0" />
                  </font>
               </Label>
               <Label layoutX="497.0" layoutY="108.0" text="Products">
                  <font>
                     <Font size="18.0" />
                  </font>
               </Label>
               <Rectangle arcHeight="50.0" arcWidth="50.0" fill="#1f93ff00" height="238.0" layoutX="479.0" layoutY="101.0" stroke="BLACK" strokeLineCap="ROUND" strokeLineJoin="ROUND" strokeType="OUTSIDE" width="418.0" />
               <TextField fx:id="SearchFieldProduct" layoutX="737.0" layoutY="121.0" onAction="#HomeSearchProductsBtn" />
               <Button layoutX="682.0" layoutY="121.0" mnemonicParsing="false" onAction="#HomeSearchProductsBtn" text="Search" />
               <TableView fx:id="TableProduct" layoutX="501.0" layoutY="157.0" prefHeight="126.0" prefWidth="374.0">
                  <columns>
                     <TableColumn fx:id="ProductID" prefWidth="77.0" text="Product ID" />
                     <TableColumn fx:id="ProductName" prefWidth="89.0" text="Product Name" />
                     <TableColumn fx:id="ProductInventoryLevel" prefWidth="94.0" text="Inventory Level" />
                     <TableColumn fx:id="ProductPPU" prefWidth="113.0" text="Price/Cost Per Unit" />
                  </columns>
               </TableView>
               <Button layoutX="624.0" layoutY="290.0" mnemonicParsing="false" onAction="#HomeAddProductsClick" prefHeight="36.0" prefWidth="70.0" text="Add" />
               <Button layoutX="708.0" layoutY="290.0" mnemonicParsing="false" onAction="#HomeModifyProductsClick" prefHeight="36.0" prefWidth="70.0" text="Modify" />
               <Button layoutX="789.0" layoutY="290.0" mnemonicParsing="false" onAction="#HomeDeleteProductsClick" prefHeight="36.0" prefWidth="70.0" text="Delete" />
               <Label layoutX="67.0" layoutY="108.0" text="Parts">
                  <font>
                     <Font size="18.0" />
                  </font>
               </Label>
               <Rectangle arcHeight="50.0" arcWidth="50.0" fill="#1f93ff00" height="238.0" layoutX="45.0" layoutY="101.0" stroke="BLACK" strokeLineCap="ROUND" strokeLineJoin="ROUND" strokeType="OUTSIDE" width="418.0" />
               <TextField fx:id="SearchFieldPart" layoutX="303.0" layoutY="121.0" />
               <Button layoutX="248.0" layoutY="121.0" mnemonicParsing="false" onAction="#PartSearchOnAction" text="Search" />
               <TableView fx:id="TablePart" layoutX="67.0" layoutY="157.0" prefHeight="126.0" prefWidth="374.0">
                  <columns>
                     <TableColumn fx:id="PartID" prefWidth="79.0" text="Part ID" />
                     <TableColumn fx:id="PartName" prefWidth="86.0" text="Part Name" />
                     <TableColumn fx:id="PartInventoryLevel" prefWidth="94.0" text="Inventory Level" />
                     <TableColumn fx:id="PartPPU" prefWidth="114.0" text="Price/Cost Per Unit" />
                  </columns>
               </TableView>
               <Button layoutX="190.0" layoutY="290.0" mnemonicParsing="false" onAction="#HomeAddPartsClick" prefHeight="36.0" prefWidth="70.0" text="Add" />
               <Button layoutX="274.0" layoutY="290.0" mnemonicParsing="false" onAction="#HomeModifyPartsClick" prefHeight="36.0" prefWidth="70.0" text="Modify" />
               <Button layoutX="355.0" layoutY="290.0" mnemonicParsing="false" onAction="#HomeDeletePartsClick" prefHeight="36.0" prefWidth="70.0" text="Delete" />
               <Button layoutX="749.0" layoutY="381.0" mnemonicParsing="false" onAction="#HomeExitClick" prefHeight="48.0" prefWidth="149.0" text="Exit" />
            </children></AnchorPane>
        </Scene>
    </scene>
</Stage>

I can reproduce the errors with only these three files. The errors are as follows.

ant -f C:\\Users\\Andrew\\Documents\\NetBeansProjects\\Reprex -Dnb.internal.action.name=run run
init:
Deleting: C:\Users\Andrew\Documents\NetBeansProjects\Reprex\build\built-jar.properties
deps-jar:
Updating property file: C:\Users\Andrew\Documents\NetBeansProjects\Reprex\build\built-jar.properties
compile:
run:
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:567)
    at javafx.graphics/com.sun.javafx.application.LauncherImpl.launchApplicationWithArgs(LauncherImpl.java:464)
    at javafx.graphics/com.sun.javafx.application.LauncherImpl.launchApplication(LauncherImpl.java:363)
    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:567)
    at java.base/sun.launcher.LauncherHelper$FXHelper.main(LauncherHelper.java:1051)
Caused by: java.lang.RuntimeException: Exception in Application start method
    at javafx.graphics/com.sun.javafx.application.LauncherImpl.launchApplication1(LauncherImpl.java:900)
    at javafx.graphics/com.sun.javafx.application.LauncherImpl.lambda$launchApplication$2(LauncherImpl.java:195)
    at java.base/java.lang.Thread.run(Thread.java:830)
Caused by: java.lang.ClassCastException: class javafx.stage.Stage cannot be cast to class javafx.scene.layout.AnchorPane (javafx.stage.Stage and javafx.scene.layout.AnchorPane are in module javafx.graphics of loader 'app')
    at InventorySystem/Software1C482.InventorySystem.initMainScreen(InventorySystem.java:32)
    at InventorySystem/Software1C482.InventorySystem.start(InventorySystem.java:48)
    at javafx.graphics/com.sun.javafx.application.LauncherImpl.lambda$launchApplication1$9(LauncherImpl.java:846)
    at javafx.graphics/com.sun.javafx.application.PlatformImpl.lambda$runAndWait$12(PlatformImpl.java:455)
    at javafx.graphics/com.sun.javafx.application.PlatformImpl.lambda$runLater$10(PlatformImpl.java:428)
    at java.base/java.security.AccessController.doPrivileged(AccessController.java:391)
    at javafx.graphics/com.sun.javafx.application.PlatformImpl.lambda$runLater$11(PlatformImpl.java:427)
    at javafx.graphics/com.sun.glass.ui.InvokeLaterDispatcher$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:174)
    ... 1 more
Exception running application Software1C482.InventorySystem
C:\Users\Andrew\Documents\NetBeansProjects\Reprex\nbproject\build-impl.xml:1330: The following error occurred while executing this line:
C:\Users\Andrew\Documents\NetBeansProjects\Reprex\nbproject\build-impl.xml:902: Java returned: 1
BUILD FAILED (total time: 3 seconds)

As said before, this question has been rewritten to better address the new problem. I'm still very new, so this may be pretty poor for a reprex.

Answer 1

I found the error. It was that I didn't include the package in HomeWindow's FXML when linking to it's controller.

Answer 2

From what I can see, your fxml contains Stage as the root element, but you are loading the object from the FXML as an AnchorPane.

The presence of the InvocationTargetException means that some constructor or field or method was called on AnchorPane, but that field/method does not exist on the object.

This is obvious because Stage is not a descendant of AnchorPane, so not even polymorphism can help you there; and when the FXMLLoader attempts to do something like setScene on the AnchorPane, this will fail.

---

You have two options for doing this:

1. Load the entire stage from FXML
2. Remove the stage declaration from FXML and just leave the root as a node.

I prefer the second option and this is also the more popular option. The first option is a bit redundant because javafx already provides you with a Stage in the start method, so I don't see the benefit in creating a new stage:

<?xml version="1.0" encoding="UTF-8"?>

<?import javafx.scene.Scene?>
<?import javafx.scene.control.Button?>
<?import javafx.scene.control.Label?>
<?import javafx.scene.control.TableColumn?>
<?import javafx.scene.control.TableView?>
<?import javafx.scene.control.TextField?>
<?import javafx.scene.layout.AnchorPane?>
<?import javafx.scene.shape.Rectangle?>
<?import javafx.scene.text.Font?>
<?import javafx.stage.Stage?>

<AnchorPane prefHeight="450.0" prefWidth="941.0" xmlns="http://javafx.com/javafx/11.0.1" xmlns:fx="http://javafx.com/fxml/1" fx:controller="ViewController.HomeWindowController">
   <children>
      <Label layoutX="40.0" layoutY="53.0" text="Inventory Management System">
         <font>
            <Font size="18.0" />
         </font>
      </Label>
      <Label layoutX="497.0" layoutY="108.0" text="Products">
         <font>
            <Font size="18.0" />
         </font>
      </Label>
      <Rectangle arcHeight="50.0" arcWidth="50.0" fill="#1f93ff00" height="238.0" layoutX="479.0" layoutY="101.0" stroke="BLACK" strokeLineCap="ROUND" strokeLineJoin="ROUND" strokeType="OUTSIDE" width="418.0" />
      <TextField fx:id="SearchFieldProduct" layoutX="737.0" layoutY="121.0" />
      <Button layoutX="682.0" layoutY="121.0" mnemonicParsing="false" text="Search" />
      <TableView fx:id="TableProduct" layoutX="501.0" layoutY="157.0" prefHeight="126.0" prefWidth="374.0">
         <columns>
            <TableColumn fx:id="ProductID" prefWidth="77.0" text="Product ID" />
            <TableColumn fx:id="ProductName" prefWidth="89.0" text="Product Name" />
            <TableColumn fx:id="ProductInventoryLevel" prefWidth="94.0" text="Inventory Level" />
            <TableColumn fx:id="ProductPPU" prefWidth="113.0" text="Price/Cost Per Unit" />
         </columns>
      </TableView>
      <Button layoutX="624.0" layoutY="290.0" mnemonicParsing="false" prefHeight="36.0" prefWidth="70.0" text="Add" />
      <Button layoutX="708.0" layoutY="290.0" mnemonicParsing="false" prefHeight="36.0" prefWidth="70.0" text="Modify" />
      <Button layoutX="789.0" layoutY="290.0" mnemonicParsing="false" prefHeight="36.0" prefWidth="70.0" text="Delete" />
      <Label layoutX="67.0" layoutY="108.0" text="Parts">
         <font>
            <Font size="18.0" />
         </font>
      </Label>
      <Rectangle arcHeight="50.0" arcWidth="50.0" fill="#1f93ff00" height="238.0" layoutX="45.0" layoutY="101.0" stroke="BLACK" strokeLineCap="ROUND" strokeLineJoin="ROUND" strokeType="OUTSIDE" width="418.0" />
      <TextField fx:id="SearchFieldPart" layoutX="303.0" layoutY="121.0" />
      <Button layoutX="248.0" layoutY="121.0" mnemonicParsing="false" onAction="#PartSearchOnAction" text="Search" />
      <TableView fx:id="TablePart" layoutX="67.0" layoutY="157.0" prefHeight="126.0" prefWidth="374.0">
         <columns>
            <TableColumn fx:id="PartID" prefWidth="79.0" text="Part ID" />
            <TableColumn fx:id="PartName" prefWidth="86.0" text="Part Name" />
            <TableColumn fx:id="PartInventoryLevel" prefWidth="94.0" text="Inventory Level" />
            <TableColumn fx:id="PartPPU" prefWidth="114.0" text="Price/Cost Per Unit" />
         </columns>
      </TableView>
      <Button layoutX="190.0" layoutY="290.0" mnemonicParsing="false" prefHeight="36.0" prefWidth="70.0" text="Add" />
      <Button layoutX="274.0" layoutY="290.0" mnemonicParsing="false" prefHeight="36.0" prefWidth="70.0" text="Modify" />
      <Button layoutX="355.0" layoutY="290.0" mnemonicParsing="false" prefHeight="36.0" prefWidth="70.0" text="Delete" />
      <Button layoutX="749.0" layoutY="381.0" mnemonicParsing="false" prefHeight="48.0" prefWidth="149.0" text="Exit" />
   </children>
</AnchorPane>

I would also change your code to this:

public class InventorySystem extends Application {
    private AnchorPane MainScreenView;
    private FXMLLoader viewLoader;

    public void initMainScreen(Stage window) throws IOException{

        viewLoader = new FXMLLoader();
        viewLoader.setLocation(InventorySystem.class.getResource("/ViewController/HomeWindow.fxml"));
        MainScreenView = viewLoader.load();

        Scene scene = new Scene(MainScreenView);

        window.setScene(scene);
        window.show();
    }

    public void showMainScreen() throws IOException{
        HomeWindowController controller = viewLoader.getController();
        controller.setMainApp(this);
    }

    @Override
    public void start(Stage primaryStage) throws Exception {
        primaryStage.setTitle("Inventory Mangement System"); 
        initMainScreen(primaryStage);
        showMainScreen();

    }

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