How to solve java.lang.IllegalAccessException (JavaFX) on Eclipse-CodePudding

I try to tidy up the file for my app by creating seperate packages according to the functionality and encounter this error:

 java.lang.IllegalAccessException: class javafx.fxml.FXMLLoader$ValueElement (in module javafx.fxml) cannot access class application.login.Login (in module eSentral_Desktop_App) because module eSentral_Desktop_App does not export application.login to module javafx.fxml

My question is how to fix this and what cause it to happen?

Here are some extra Information:
This is my class hierarchy:

this is my Main.java code:

package application;
import javafx.application.Application;
import javafx.fxml.FXMLLoader;
import javafx.stage.Stage;
import jfxtras.styles.jmetro.JMetro;
import jfxtras.styles.jmetro.Style;
import javafx.scene.Parent;
import javafx.scene.Scene;
import java.io.IOException;
import application.login.Users;
import application.listing.Homepage;
public class Main extends Application{
    public static Object currentUser = new Object();
    double x,y = 0;
    private static Stage stg;
    @Override
    public void start(Stage primaryStage) throws Exception{
        try {
            stg = primaryStage;
            Parent root = FXMLLoader.load(getClass().getResource("login/LoginUI.fxml"));
            Scene scene = new Scene(root);
            JMetro jMetro = new JMetro(scene, Style.LIGHT);
            scene.getStylesheets().add(getClass().getResource("application.css").toExternalForm());
            
            primaryStage.setScene(scene);
            primaryStage.show();
            
        } catch(Exception e) {
            e.printStackTrace();
        }
    }
    public void changeScene(String fxml) throws IOException {
        Parent pane = FXMLLoader.load(getClass().getResource(fxml));
        stg.getScene().setRoot(pane);
    }
    public static void main(String[] args) {
        launch(args);
    }
}

This is my Login.java the controller class for LoginUI.fxml code

package application.login;

import application.utils.Constants;
import application.Main;
import application.utils.ESentralConstants;
import application.utils.HttpUrlConnectionAPI;
import application.login.Users;
import application.utils.WhiteLabel;
import application.utils.SerializationUtil;
import application.utils.Utils;
import javafx.event.ActionEvent;
import javafx.fxml.FXML;
import javafx.fxml.FXMLLoader;
import javafx.scene.Cursor;
import javafx.scene.Parent;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.control.Label;
import javafx.scene.control.TextField;
import javafx.scene.input.MouseEvent;
import javafx.stage.Stage;
import javafx.application.Platform;
import javafx.concurrent.Task;
import javafx.concurrent.WorkerStateEvent;

import java.io.IOException;

import com.google.gson.JsonElement;
import com.google.gson.JsonObject;
import com.google.gson.JsonParser;

public class Login extends Main{
    
    private ESentralConstants eConstants;
    @FXML
    private Label lblEmail, lblPassword, lblStatus,lblForgot;
    
    @FXML
    private TextField txtUsername;
    
    @FXML
    private TextField txtPassword;
    
    @FXML
    private Button btnLogin, btnFB, btnRegister;
    
    public void loginAuthentication() throws Exception
    {
         eConstants = new ESentralConstants();
         final String logIn_UserName = txtUsername.getText();
         String logIn_UserPassword =  txtPassword.getText();

         txtPassword.setText("");
         lblStatus.setText("");

        lblEmail.setText("");
        lblPassword.setText("");
         
         if (logIn_UserName.length() == 0) {
                lblEmail.setText("Email field is empty");
                Platform.runLater(() ->  txtUsername.requestFocus());

            } else if (logIn_UserPassword.length() == 0) {
                lblPassword.setText("Password field is empty");
                Platform.runLater(() ->  txtPassword.requestFocus());
            }else
            {
                 txtUsername.setText("");
                
                // HttpUrlConnectionAPI httpUrlConnectionAPI = new HttpUrlConnectionAPI();
                 String urlParameters = eConstants.getTAG()   eConstants.getVALUE()
                           Constants.LOGIN_API_TAG_USERNAME   logIn_UserName
                           Constants.LOGIN_API_TAG_PASSWORD   logIn_UserPassword;
                         //  Constants.LOGIN_API_TAG_DEVICEID   uDI.uniqueId();

                 Task<String> signInTask = new HttpUrlConnectionAPI(eConstants.getLOGIN_API_LOGIN_URL(), urlParameters);
            
               //Call HttpUrlConnectionAPI Task instance
                 Thread signInThread = new Thread(signInTask);
                 signInThread.setDaemon(true);
                 signInThread.start();
                 
                 signInTask.setOnSucceeded((WorkerStateEvent t) -> {

                     String resultToCheck = signInTask.getValue();

                     //Handling Server reply when user trying to SignIn
                     if (resultToCheck.matches(Constants.LOGIN_API_REPLY_FULL)) {
                        lblEmail.setText(Constants.ERR_DIALOG_TITLE   " "   Constants.MGS_ACTIVATION   " "   Constants.MGS_DEACTIVATE);
                     } else if (resultToCheck.matches(Constants.LOGIN_API_REPLY_FAILED)) {
                         lblEmail.setText("Invalid Email or Password");
                     } else {
                         lblStatus.setText("Login successful");
                         //Utils.makeDirectory(WhiteLabel.STORAGE_USERS_FOLDER   logIn_UserName   Constants.DOWNLOADED_BOOKS);
                         // Parsing String into Json Object
                         JsonParser jsonParser = new JsonParser();
                         JsonElement jsonElement = jsonParser.parse(resultToCheck);
                         JsonObject jsonObject = jsonElement.getAsJsonObject();

                         // Parsing String into Java Object
                         Users user = new Users(jsonObject.get(Constants.LOGIN_API_REPLY_ID).toString().replace("\"", ""), Utils.md5Hash(logIn_UserPassword),
                                 jsonObject.get(Constants.LOGIN_API_REPLY_USERNAME).toString().replace("\"", ""), jsonObject.get(Constants.LOGIN_API_REPLY_CONTACT).toString().replace("\"", ""),
                                 jsonObject.get(Constants.LOGIN_API_REPLY_EMAIL).toString().replace("\"", ""), jsonObject.get(Constants.LOGIN_API_REPLY_ENCRYPTKEY).toString().replace("\"", ""),
                                 jsonObject.get(Constants.LOGIN_API_REPLY_LOGINKEY).toString().replace("\"", ""), jsonObject.get(Constants.LOGIN_API_REPLY_NAME).toString().replace("\"", ""), true, Constants.EMPTY);
                         Main.currentUser = (Users) user;
                         try {
                             Main m = new Main();
                             m.changeScene("homepage.fxml");
                             
                         }
                         catch(Exception e)
                         {
                             e.printStackTrace();
                         }
                         /*try {
                             // Storing user object into storage
                             
                             
                             // Navigate to the Listing Scene
                        
                            
                         }catch (IOException e) {
                             lblStatus.setText("Permission not granted");
                         }*/

                         //Utils.addOrDeleteUserFromList(logIn_UserName, true);
                     }
                 });
                 signInTask.setOnFailed((event) -> {
                     lblStatus.setText("Process failed.");
                 });
                 signInTask.setOnCancelled((event) -> {
                     lblStatus.setText("Process cancelled.");
                 });
            }
    }
    public void login(ActionEvent event) throws Exception
    {
        this.loginAuthentication();
    }
    
    
    public void forgetPassword(MouseEvent ev) throws Exception
    {
             try {
                 Main m = new Main();
                 m.changeScene("forgetPassword.fxml");
                 
             }
             catch(Exception e)
             {
                 e.printStackTrace();
             }
    }
    
    public void MouseEnter(MouseEvent ev)
    {
         lblForgot.setCursor(Cursor.HAND);
         btnRegister.setCursor(Cursor.HAND);
         btnLogin.setCursor(Cursor.HAND);
         btnFB.setCursor(Cursor.HAND);
    }
    
    public void MouseExit(MouseEvent ev)
    {
         lblForgot.setCursor(Cursor.DEFAULT);
         btnRegister.setCursor(Cursor.DEFAULT);
         btnLogin.setCursor(Cursor.DEFAULT);
         btnFB.setCursor(Cursor.DEFAULT);
    }
}

This is my LoginUI.fxml code:

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

<?import javafx.scene.control.Button?>
<?import javafx.scene.control.Label?>
<?import javafx.scene.control.PasswordField?>
<?import javafx.scene.control.Separator?>
<?import javafx.scene.control.TextField?>
<?import javafx.scene.image.Image?>
<?import javafx.scene.image.ImageView?>
<?import javafx.scene.layout.AnchorPane?>
<?import javafx.scene.layout.BorderPane?>
<?import javafx.scene.text.Font?>

<BorderPane maxHeight="-Infinity" maxWidth="-Infinity" prefHeight="700.0" prefWidth="800.1" xmlns="http://javafx.com/javafx/17" xmlns:fx="http://javafx.com/fxml/1" fx:controller="application.login.Login">
   <top>
      <AnchorPane maxHeight="-Infinity" maxWidth="-Infinity" prefHeight="115.0" prefWidth="800.0" BorderPane.alignment="CENTER">
         <children>
            <ImageView fitHeight="80.0" fitWidth="249.0" layoutX="276.0" layoutY="18.0" pickOnBounds="true" preserveRatio="true">
               <image>
                  <Image url="@../resources/ic_eSentral_Logo.png" />
               </image>
            </ImageView>
         </children>
      </AnchorPane>
   </top>
   <bottom>
      <AnchorPane maxHeight="-Infinity" maxWidth="-Infinity" prefHeight="133.0" prefWidth="800.0" BorderPane.alignment="CENTER">
         <children>
            <Button fx:id="btnRegister" layoutX="248.0" layoutY="63.0" mnemonicParsing="false" onm ouseEntered="#MouseEnter" onm ouseExited="#MouseExit" prefHeight="44.0" prefWidth="318.0" style="-fx-background-color: #169fe3;" text="Register a new account" textFill="WHITE">
               <font>
                  <Font name="System Bold" size="20.0" />
               </font>
            </Button>
            <Label alignment="CENTER" layoutX="311.0" layoutY="24.0" text="Don't have an account yet?" textFill="#1286bc">
               <font>
                  <Font name="System Bold" size="15.0" />
               </font>
            </Label>
         </children>
      </AnchorPane>
   </bottom>
   <center>
      <AnchorPane maxHeight="-Infinity" maxWidth="-Infinity" prefHeight="487.0" prefWidth="800.0" BorderPane.alignment="CENTER">
         <children>
            <Label fx:id="lblSuccess" alignment="CENTER" layoutX="247.0" layoutY="2.0" prefHeight="24.0" prefWidth="318.0" textFill="#00ff26">
               <font>
                  <Font name="System Bold" size="15.0" />
               </font>
            </Label>
            <TextField fx:id="txtUsername" layoutX="247.0" layoutY="77.0" prefHeight="44.0" prefWidth="318.0" promptText="Email">
               <font>
                  <Font size="15.0" />
               </font>
            </TextField>
            <Label fx:id="lblEmail" alignment="CENTER" layoutX="247.0" layoutY="121.0" prefHeight="24.0" prefWidth="318.0" textFill="#ec1e1e">
               <font>
                  <Font name="System Bold" size="15.0" />
               </font>
            </Label>
            <PasswordField fx:id="txtPassword" layoutX="247.0" layoutY="145.0" prefHeight="44.0" prefWidth="318.0" promptText="Password">
               <font>
                  <Font size="15.0" />
               </font>
            </PasswordField>
            <Label fx:id="lblPassword" alignment="CENTER" layoutX="247.0" layoutY="189.0" prefHeight="24.0" prefWidth="318.0" textFill="#ec1e1e">
               <font>
                  <Font name="System Bold" size="15.0" />
               </font>
            </Label>
            <Label fx:id="lblForgot" alignment="CENTER" layoutX="326.0" layoutY="226.0" onm ouseClicked="#forgetPassword" onm ouseEntered="#MouseEnter" onm ouseExited="#MouseExit" text="Forget your password?  " textFill="#1286bc" underline="true">
               <font>
                  <Font size="15.0" />
               </font>
            </Label>
            <Label fx:id="lblForgot1" alignment="CENTER" layoutX="380.0" layoutY="35.0" text="Login" textFill="#1286bc">
               <font>
                  <Font name="System Bold" size="20.0" />
               </font>
            </Label>
            <Button fx:id="btnLogin" layoutX="247.0" layoutY="274.0" mnemonicParsing="false" onAction="#login" onm ouseEntered="#MouseEnter" onm ouseExited="#MouseExit" prefHeight="44.0" prefWidth="318.0" style="-fx-background-color: #169fe3;" text="Log in" textFill="WHITE">
               <font>
                  <Font name="System Bold" size="20.0" />
               </font>
            </Button>
            <Button fx:id="btnFB" alignment="CENTER" layoutX="247.0" layoutY="380.0" mnemonicParsing="false" onm ouseEntered="#MouseEnter" onm ouseExited="#MouseExit" prefHeight="44.0" prefWidth="318.0" style="-fx-background-color: #4766a9;" text="Log in with Facebook" textFill="WHITE">
               <font>
                  <Font name="System Bold" size="20.0" />
               </font>
               <graphic>
                  <ImageView fitHeight="35.0" fitWidth="63.0" pickOnBounds="true" preserveRatio="true">
                     <image>
                        <Image url="@../resources/ic_facebook.png" />
                     </image>
                  </ImageView>
               </graphic>
            </Button>
            <Separator layoutX="247.0" layoutY="338.0" prefHeight="28.0" prefWidth="130.0" />
            <Separator layoutX="434.0" layoutY="338.0" prefHeight="28.0" prefWidth="130.0" />
            <Label layoutX="392.0" layoutY="337.0" text="OR" textFill="#1286bc">
               <font>
                  <Font name="System Bold" size="20.0" />
               </font>
            </Label>
         </children>
      </AnchorPane>
   </center>
</BorderPane>

This is module-info code:

module eSentral_Desktop_App {
    requires javafx.controls;
    requires java.net.http;
    requires javafx.fxml;
    requires javafx.base;
    requires javafx.graphics;
    requires com.google.gson;
    requires java.logging;
    requires java.desktop;
    requires org.jfxtras.styles.jmetro;
    
    opens application to javafx.graphics, javafx.fxml;
}

CodePudding user response：

Thank you to jewelsea, this problem is solve. All I need to do is add

opens application.login to javafx.fxml;

into module-info.java.

It will look like this:

module eSentral_Desktop_App {
    requires javafx.controls;
    requires java.net.http;
    requires javafx.fxml;
    requires javafx.base;
    requires javafx.graphics;
    requires com.google.gson;
    requires java.logging;
    requires java.desktop;
    requires org.jfxtras.styles.jmetro;
    
    opens application.login to javafx.fxml;
    opens application to javafx.graphics, javafx.fxml;
}