Bar chart in javafx does not show anything - mysql

Question

<?xml version="1.0" encoding="UTF-8"?>
<?import javafx.geometry.Insets?>
<?import javafx.scene.chart.BarChart?>
<?import javafx.scene.chart.CategoryAxis?>
<?import javafx.scene.chart.NumberAxis?>
<?import javafx.scene.control.Button?>
<?import javafx.scene.control.Label?>
<?import javafx.scene.layout.AnchorPane?>
<?import javafx.scene.layout.HBox?>
<?import javafx.scene.layout.VBox?>
<AnchorPane id="AnchorPane" prefHeight="600.0" prefWidth="800.0" styleClass="mainFxmlClass" xmlns="http://javafx.com/javafx/11.0.1" xmlns:fx="http://javafx.com/fxml/1" fx:controller="Views.MonthlyHoursController">
<children>
<VBox alignment="CENTER" layoutX="121.0" layoutY="121.0" prefHeight="600.0" prefWidth="800.0" spacing="20.0" AnchorPane.bottomAnchor="0.0" AnchorPane.leftAnchor="0.0" AnchorPane.rightAnchor="0.0" AnchorPane.topAnchor="0.0">
<children>
<Label styleClass="header" text="Monthly Hours" />
<HBox prefHeight="292.0" prefWidth="760.0">
<children>
<BarChart fx:id="barChart" prefHeight="292.0" prefWidth="755.0">
<xAxis>
<CategoryAxis fx:id="months" side="BOTTOM" />
</xAxis>
<yAxis>
<NumberAxis fx:id="hoursWorked" side="LEFT" />
</yAxis>
</BarChart>
</children>
</HBox>
<HBox alignment="BOTTOM_RIGHT" prefHeight="100.0" prefWidth="200.0" spacing="20.0">
<children>
<Button mnemonicParsing="false" text=" Back" />
</children>
</HBox>
</children>
<padding>
<Insets bottom="20.0" left="20.0" right="20.0" top="20.0" />
</padding>
</VBox>
</children>
</AnchorPane>
Above is my fxml file for the bar chart
package Views;
import java.net.URL;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.time.LocalDate;
import java.util.ResourceBundle;
import javafx.fxml.FXML;
import javafx.fxml.Initializable;
import javafx.scene.chart.BarChart;
import javafx.scene.chart.CategoryAxis;
import javafx.scene.chart.NumberAxis;
import javafx.scene.chart.XYChart;
public class MonthlyHoursController implements Initializable {
#FXML private BarChart<?, ?> barChart;
#FXML private CategoryAxis months;
#FXML private NumberAxis hoursWorked;
private XYChart.Series currentYearSeries, previousYearSeries;
#Override
public void initialize(URL arg0, ResourceBundle arg1) {
currentYearSeries = new XYChart.Series<>();
previousYearSeries = new XYChart.Series<>();
// barChart.setTitle("Hours Worked");
months.setLabel("Months");
hoursWorked.setLabel("Hours Worked");
currentYearSeries.setName(Integer.toString(LocalDate.now().getYear()));
previousYearSeries.setName(Integer.toString(LocalDate.now().getYear()-1));
try {
populateSeriesFromDB();
} catch (SQLException e) {
e.printStackTrace();
}
barChart.getData().addAll(previousYearSeries);
barChart.getData().addAll(currentYearSeries);
}
private void populateSeriesFromDB() throws SQLException {
Connection conn = null;
Statement statement = null;
ResultSet resultSet = null;
try{
conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/bakery?useSSL=false", "root",
"a3756421");
statement = conn.createStatement();
String sql = " Select Year(dateworked), monthname(dateworked), sum(hoursworked)" +
"From hoursworked" +
"Group by year(dateworked), month(dateworked)" +
"Order by Year(dateworked), month(dateworked);";
resultSet = statement.executeQuery(sql);
while (resultSet.next()){
if(resultSet.getInt(1)==LocalDate.now().getYear())
currentYearSeries.getData().add(new XYChart.Data(resultSet.getString(2), resultSet.getString(3)));
else if(resultSet.getInt(1)==LocalDate.now().getYear()-1)
previousYearSeries.getData().add(new XYChart.Data(resultSet.getString(2), resultSet.getString(3)));
}
}
catch (SQLException e){
System.err.println(e.getMessage());
}
finally{
if(conn !=null)
conn.close();
if (statement != null)
statement.close();
if(resultSet != null)
resultSet.close();
}
}
}
this is the controller for the fxml.
If I perform
From hoursworked
Group by Year(dateworked), month(dateworked)
Order by Year(dateworked), month(dateworked);
in workbench, it gives below:
However, when I open the fxml file, it doesnt show anything in the bar chart.
Is there something wrong with my javafx or mysql syntax?
The program itself does not give any error when it's run.
I have no idea where to even start fixing this.