Filling JavaFX table

Question

I am new to javaFX and I am trying to populate a my clientDataTable with data from the ObservableList clientData. My ConnectionsPane constructor create a test Client object and I am trying to get my ConnectionsPaneController to populate the table. I am new to javaFX and no matter what I do I cannot seem to get to get the table to populate. Can someone help me out??

I will include the files that are used for this process.

I left out the Client.java class. Adding now.

Thanks!

====

Edit - So I implemented the changes requested below. I also looked up the samples resources and tried to use them. I keep coming back to a null excecption error when trying to set the table items at

clientDataTable.setItems(ConnectionsPane.getClientData());

However when I print out ConnectionsPane.getClientData() it does give me an observable list with clients in it.

Edit 2 - So I spent more time looking at the samples and trying to convert it to my setup as I need this specific menu setup. I also looked at the duplicate post and I updated my code so its not static. The code runs fine now and the client object it create and displayed in the console but it still will not display in the table. I think it might be to do with the controller access but not sure. I never thought a table would be this much hassle :) Can anyone help?

MainMenu.java

package io.ironbytes.corkscrew.models;

import javafx.application.Application;
import javafx.fxml.FXMLLoader;
import javafx.scene.Parent;
import javafx.scene.Scene;
import javafx.stage.Stage;

public class MainMenu extends Application {
    Parent root;
    Stage stage;

    @Override
    public void start(Stage primaryStage) {

        try {
            root = FXMLLoader.load(getClass().getResource("../views/MainMenu.fxml"));
            stage = primaryStage;
            stage.setTitle("Welcome");
     
            Scene scene = new Scene(root);
            stage.setScene(scene);
            stage.show();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
    

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

ConnectionsPaneController.java

package io.ironbytes.corkscrew.controllers;

import io.ironbytes.corkscrew.models.Client;
import io.ironbytes.corkscrew.models.ConnectionsPane;
import javafx.fxml.FXML;
import javafx.scene.control.TableColumn;
import javafx.scene.control.TableView;

public class ConnectionsPaneController {

 @FXML private TableView<Client> clientDataTable;
 @FXML private TableColumn<Client, String> online;
 @FXML private TableColumn<Client, String> username;
 private ConnectionsPane ConnectionsPane;

 public ConnectionsPaneController() {
  
 }
 
    /**
     * Initializes the controller class. This method is automatically called
     * after the fxml file has been loaded.
     */
    @FXML
    private void initialize() {
       username.setCellValueFactory(cellData -> cellData.getValue().getUsername());

    }
    
    /**
     * Is called by the main application to give a reference back to itself.
     * 
     * @param mainApp
     */
    public void setMainApp(ConnectionsPane ConnectionsPane) {
        this.ConnectionsPane = ConnectionsPane;

     // Prints: [Client [clientID=1, isOnline=true, username=StringProperty [value: test], ipAddress=1.1.1.1]]
        System.out.println(ConnectionsPane.getClientData());
     // Add observable list data to the table
        clientDataTable.setItems(ConnectionsPane.getClientData());
        clientDataTable.refresh();
       
    }
 
}

ConnectionsPane.java

package io.ironbytes.corkscrew.models;

import java.io.IOException;

import javafx.collections.FXCollections;
import javafx.collections.ObservableList;
import javafx.fxml.FXMLLoader;
import javafx.scene.layout.AnchorPane;

public class ConnectionsPane extends AnchorPane{
 
    /**
     * The data as an observable list of Persons.
     */
    public ObservableList<Client> clientData = FXCollections.observableArrayList();
    

    public ConnectionsPane(){
     
        //Add a test client to the ObservableList
        clientData.add(new Client(1));
        
        System.out.println(getClientData());
        FXMLLoader fxmlLoader = new FXMLLoader(getClass().getResource("../views/ConnectionsPane.fxml"));
        
        //Give the controller access to the main app.
        //ConnectionsPaneController controller = fxmlLoader.getController();
        //controller.setMainApp(this);
        
        fxmlLoader.setRoot(this);
        fxmlLoader.setController(this);

        try {
            fxmlLoader.load();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
    
    public ObservableList<Client> getClientData() {
        return clientData;
    
    }

}

ConnectionsPane.fxml

package io.ironbytes.corkscrew.models;

import java.io.IOException;

import javafx.collections.FXCollections;
import javafx.collections.ObservableList;
import javafx.fxml.FXMLLoader;
import javafx.scene.layout.AnchorPane;

public class ConnectionsPane extends AnchorPane{
 
    /**
     * The data as an observable list of Persons.
     */
    public ObservableList<Client> clientData = FXCollections.observableArrayList();
    

    public ConnectionsPane(){
     
        //Add a test client to the ObservableList
        clientData.add(new Client(1));
        
        System.out.println(getClientData());
        FXMLLoader fxmlLoader = new FXMLLoader(getClass().getResource("../views/ConnectionsPane.fxml"));
        
        //Give the controller access to the main app.
        //ConnectionsPaneController controller = fxmlLoader.getController();
        //controller.setMainApp(this);
        
        fxmlLoader.setRoot(this);
        fxmlLoader.setController(this);

        try {
            fxmlLoader.load();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
    
    public ObservableList<Client> getClientData() {
        return clientData;
    
    }

}

Client.java

package io.ironbytes.corkscrew.models;

import javafx.beans.property.SimpleStringProperty;
import javafx.beans.property.StringProperty;

public class Client {
 
 private int clientID;
 private boolean isOnline;
 private StringProperty username;
 private String ipAddress;
 
 public Client() {

 }
 
 public Client(int ClientID) {
  this.clientID=ClientID;
  this.isOnline=true;
  this.ipAddress="1.1.1.1";
  this.username = new SimpleStringProperty("test");
 }

 @Override
 public String toString() {
  return "Client [clientID=" + clientID + ", isOnline=" + isOnline + ", username=" + username + ", ipAddress="
    + ipAddress + "]";
 }

 public int getClientID() {
  return clientID;
 }
 
 public void setClientID(int clientID) {
  this.clientID = clientID;
 }

 public boolean isOnline() {
  return isOnline;
 }

 public void setOnline(boolean isOnline) {
  this.isOnline = isOnline;
 }

 public StringProperty getUsername() {
  return username;
 }

 public void setUsername(StringProperty username) {
  this.username = username;
 }

 public String getIpAddress() {
  return ipAddress;
 }

 public void setIpAddress(String ipAddress) {
  this.ipAddress = ipAddress;
 }


}