JavaFX TableView values Null - javafx

Question

I am getting some error that I do not understand every time I try to run this program. The error seems to be triggered only when I have set these following lines BaseColorColumn.setCellValueFactory(new PropertyValueFactory<BaseColor, String>("BaseColor"));
and PriceColumn.setCellValueFactory(new PropertyValueFactory<BaseColor, Integer>("Price"));
I believe they're returning NULL but I am not sure why. I am basically just trying to fill in the table called CustomerTableView with data from BaseColor
//FXML
<?xml version="1.0" encoding="UTF-8"?>
<?import java.lang.*?>
<?import javafx.scene.control.*?>
<?import javafx.scene.layout.*?>
<BorderPane maxHeight="-Infinity" maxWidth="-Infinity" minHeight="-Infinity" minWidth="-Infinity" prefHeight="400.0" prefWidth="600.0" xmlns="http://javafx.com/javafx/8" xmlns:fx="http://javafx.com/fxml/1" fx:controller="supremeinkcalcmk2.MainController">
<left>
<VBox prefHeight="400.0" prefWidth="152.0" BorderPane.alignment="CENTER">
<children>
<TableView prefHeight="404.0" prefWidth="152.0">
<columns>
<TableColumn editable="false" prefWidth="75.0" sortable="false" text="Formla" />
<TableColumn editable="false" prefWidth="75.0" sortable="false" text="Price" />
</columns>
</TableView>
</children>
</VBox>
</left>
<right>
<VBox prefHeight="400.0" prefWidth="152.0" BorderPane.alignment="CENTER">
<children>
<ComboBox fx:id="ComboBoxSelectCustomer" prefWidth="150.0" promptText="Select Customer" />
<TableView fx:id="CustomerTableView" prefHeight="266.0" prefWidth="152.0">
<columns>
<TableColumn fx:id="BaseColor" prefWidth="75.0" text="Base Color" />
<TableColumn fx:id="Price" editable="false" prefWidth="75.0" sortable="false" text="Price" />
</columns>
</TableView>
<Button fx:id="ButtonSaveCustomer" mnemonicParsing="false" prefHeight="25.0" prefWidth="152.0" text="Save Customer" />
</children>
</VBox>
</right>
<center>
<Pane prefHeight="200.0" prefWidth="200.0" BorderPane.alignment="CENTER">
<children>
<Label layoutX="103.0" layoutY="122.0" text="Pantone Number" />
<TextField layoutX="74.0" layoutY="139.0" />
<Label fx:id="PriceLabel" layoutX="132.0" layoutY="293.0" />
<Button fx:id="ButtonCalculate" layoutX="113.0" layoutY="200.0" mnemonicParsing="false" onAction="#CalculateButton" text="Calculate" />
<Label layoutX="131.0" layoutY="285.0" text="Label" />
</children>
</Pane>
</center>
</BorderPane>
//MainController.Java
/*
* To change this license header, choose License Headers in Project Properties.
* To change this template file, choose Tools | Templates
* and open the template in the editor.
*/
package supremeinkcalcmk2;
import java.net.URL;
import java.util.ResourceBundle;
import javafx.collections.FXCollections;
import javafx.collections.ObservableList;
import javafx.fxml.FXML;
import javafx.fxml.Initializable;
import javafx.scene.control.ComboBox;
import javafx.scene.control.TableColumn;
import javafx.scene.control.TableView;
import javafx.scene.control.cell.PropertyValueFactory;
/**
* FXML Controller class
*
* #author Archa
*/
public class MainController implements Initializable {
#FXML public ComboBox ComboBoxSelectCustomer;
#FXML private TableView<BaseColor> CustomerTableView;
#FXML private TableColumn<BaseColor, String> BaseColorColumn;
#FXML private TableColumn<BaseColor, Integer> PriceColumn;
//Customer TableView
ObservableList<BaseColor> data = FXCollections.observableArrayList(
new BaseColor("Yellow", 0),
new BaseColor("Green", 0),
new BaseColor("Blue", 0)
);
/**
* Initializes the controller class.
*/
#Override
public void initialize(URL url, ResourceBundle rb) {
// TODO
//CustomerTableView
BaseColorColumn.setCellValueFactory(new PropertyValueFactory<BaseColor, String>("BaseColor"));
PriceColumn.setCellValueFactory(new PropertyValueFactory<BaseColor, Integer>("Price"));
CustomerTableView.setItems(data);
}
public void CalculateButton(){
System.out.print("it is working!");
}
}
//BaseColor.Java
/*
* To change this license header, choose License Headers in Project Properties.
* To change this template file, choose Tools | Templates
* and open the template in the editor.
*/
package supremeinkcalcmk2;
/**
*
* #author Arch
*/
public class BaseColor {
private String BaseColor;
private double Price;
public BaseColor(String BaseColor, double Price){
this.BaseColor = "";
this.Price = 0;
}
public String getBaseColor() {
return BaseColor;
}
public void setBaseColor(String BaseColor) {
this.BaseColor = BaseColor;
}
public double getPrice() {
return Price;
}
public void setPrice(double Price) {
this.Price = Price;
}
}
//Error log
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:497)
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:497)
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$152(LauncherImpl.java:182)
at com.sun.javafx.application.LauncherImpl$$Lambda$50/1343441044.run(Unknown Source)
at java.lang.Thread.run(Thread.java:745)
Caused by: javafx.fxml.LoadException:
file:/D:/Programming/SupremeInkCalcMk2/dist/run103801275/SupremeInkCalcMk2.jar!/supremeinkcalcmk2/Main.fxml
at javafx.fxml.FXMLLoader.constructLoadException(FXMLLoader.java:2605)
at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:2583)
at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:2445)
at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3218)
at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3179)
at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3152)
at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3128)
at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3108)
at javafx.fxml.FXMLLoader.load(FXMLLoader.java:3101)
at supremeinkcalcmk2.SupremeInkCalcMk2.start(SupremeInkCalcMk2.java:33)
at com.sun.javafx.application.LauncherImpl.lambda$launchApplication1$159(LauncherImpl.java:863)
at com.sun.javafx.application.LauncherImpl$$Lambda$53/726585699.run(Unknown Source)
at com.sun.javafx.application.PlatformImpl.lambda$runAndWait$172(PlatformImpl.java:326)
at com.sun.javafx.application.PlatformImpl$$Lambda$46/355629945.run(Unknown Source)
at com.sun.javafx.application.PlatformImpl.lambda$null$170(PlatformImpl.java:295)
at com.sun.javafx.application.PlatformImpl$$Lambda$48/1149823713.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at com.sun.javafx.application.PlatformImpl.lambda$runLater$171(PlatformImpl.java:294)
at com.sun.javafx.application.PlatformImpl$$Lambda$47/1915503092.run(Unknown Source)
at com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:95)
at com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
at com.sun.glass.ui.win.WinApplication.lambda$null$145(WinApplication.java:101)
at com.sun.glass.ui.win.WinApplication$$Lambda$36/1963387170.run(Unknown Source)
... 1 more
Caused by: java.lang.NullPointerException
at supremeinkcalcmk2.MainController.initialize(MainController.java:52)
at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:2552)
... 22 more
Exception running application supremeinkcalcmk2.SupremeInkCalcMk2
Java Result: 1

Answer 1

Your fx:ids do not match the field names:
<TableColumn fx:id="BaseColor" prefWidth="75.0" text="Base Color" />
<TableColumn fx:id="Price" editable="false" prefWidth="75.0" sortable="false" text="Price" />
but
#FXML private TableColumn<BaseColor, String> BaseColorColumn;
#FXML private TableColumn<BaseColor, Integer> PriceColumn;