JavaFX and Scene Builder BubbleChart

Controller.java

package sample;

import javafx.fxml.FXML;
import javafx.fxml.Initializable;
import javafx.scene.chart.BubbleChart;
import javafx.scene.chart.XYChart;

import java.net.URL;
import java.util.ResourceBundle;

public class Controller implements Initializable {

    @FXML
    private BubbleChart<Integer, Integer> bubbleChart;

    XYChart.Series series1 = new XYChart.Series();
    XYChart.Series series2 = new XYChart.Series();

    @Override
    public void initialize(URL url, ResourceBundle resourceBundle) {

        bubbleChart.getXAxis().setLabel("Week");
        bubbleChart.getYAxis().setLabel("Budget");

        series1.setName("Product");
        series1.getData().add(new XYChart.Data(1, 35));
        series1.getData().add(new XYChart.Data(13, 67, 7));
        series1.getData().add(new XYChart.Data(22, 24));
        series1.getData().add(new XYChart.Data(24, 12));
        series1.getData().add(new XYChart.Data(42, 5));
        series1.getData().add(new XYChart.Data(45, 5));
        series1.getData().add(new XYChart.Data(49, 32));
        series1.getData().add(new XYChart.Data(50, 44));

        series2.setName("Product_2");
        series2.getData().add(new XYChart.Data(12, 33));
        series2.getData().add(new XYChart.Data(13, 23, 7));
        series2.getData().add(new XYChart.Data(43, 12));
        series2.getData().add(new XYChart.Data(23, 43));
        series2.getData().add(new XYChart.Data(43, 34));
        series2.getData().add(new XYChart.Data(12, 33));
        series2.getData().add(new XYChart.Data(43, 3));
        series2.getData().add(new XYChart.Data(11, 41));

        bubbleChart.getData().addAll(series1, series2);
    }
}