Here is a java example that retrieves the record from database and create a pie chart.

import java.sql.*;
import java.io.*;
import org.jfree.ui.*;
import org.jfree.chart.ChartPanel;
import org.jfree.chart.ChartFactory;
import org.jfree.chart.ChartUtilities;
import org.jfree.chart.JFreeChart;
import org.jfree.data.*;
import org.jfree.data.jdbc.JDBCPieDataset;

public class Chart {
        public static void main(String[] args) throws Exception {

                String query = "SELECT * from result";
                JDBCPieDataset dataset = new JDBCPieDataset(
                                "jdbc:mysql://localhost:3306/test", "com.mysql.jdbc.Driver",
                                "root", "root");

                dataset.executeQuery(query);
                JFreeChart chart = ChartFactory.createPieChart("Test", dataset, true,
                                true, false);
                ChartPanel chartPanel = new ChartPanel(chart);
                chartPanel.setPreferredSize(new java.awt.Dimension(500, 270));
                ApplicationFrame f = new ApplicationFrame("Chart");
                f.setContentPane(chartPanel);
                f.pack();
                f.setVisible(true);

        }
}