Erro em JDBCPieDataset

/*
 * Applet1.java
 *
 * Created on 11 de Agosto de 2006, 10:15
 *
 * To change this template, choose Tools | Template Manager
 * and open the template in the editor.
 */

/**
 *
 * @author Fernando Silva (xxxxx)
 */

import java.sql.*;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.SQLException;
import org.jfree.chart.*;
import org.jfree.data.jdbc.JDBCPieDataset;
import org.jfree.data.general.DefaultPieDataset;
import org.jfree.data.jdbc.*;

public class Applet1 {
 
    public static Connection con;
    
   
    public Applet1 realData(){
        //JDBCPieDataset data = null;
        DefaultPieDataset data = null;
        String url = "jdbc:mysql://localhost/cmuf";
        //Connection con;
        
        try {
            Class.forName("com.mysql.jdbc.Driver");
        }//fim do try
        catch (ClassNotFoundException e) {
            System.err.print("ClassNotFoundException: ");
            System.err.println(e.getMessage());
        }//fim do catch
        try {
            con = DriverManager.getConnection(url, "UsuarioBD", "Password");
            data = new JDBCPieDataset(con);
            String sql = "Select local, carga, autocod, data FROM dados";
            //PreparedStatement data1 = con.preparedStatement("Select local, carga, autocod, data FROM dados");
            data.executeQuery(sql); [b]//ERRO NESSA LINHA[/b]
            con.close();
            }//fim do try
        catch (SQLException e) {
            System.err.print("SQLException: ");
            System.err.println(e.getMessage());
            }//fim do catch
        catch (Exception e) {
            System.err.print("Exception: ");
            System.err.println(e.getMessage());
            }//fim do catch
        return data;  [b]// ERRO NESSA LINHA[/b]
        
        
}//fim do Objeto
    
    public static void main(String args[]) {
        Applet1 test = new Applet1();
        test.realData();

}
}//fim da classe