Need help with my code .... PLEASE HELP!!!!

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package wheeliesvehicalrentalspackage;

import java.sql.*;
import java.util.*;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.swing.JOptionPane;

/**
*
* @author Felisha
*/
public class WVRSApplication {

private Staff currentStaff;
private ArrayList<Customer> customerList;
private ArrayList<Vehicle> vehicleList;

//No args constructor
public WVRSApplication(){}

//Full Constructor
public WVRSApplication(Staff s)
{
this.currentStaff = s;

//Gte instance of staffDAO
StaffDAO sdao = new StaffDAO();
Logger logger = Logger.getLogger("wheeliesvehicalrentalspackage.WV RSApplication");

//Load customer list from database
try{
//Load customer list from database
this.customerList = sdao.getAllCustomersFromDatabase();

//Load vehicle list from database
this.vehicleList = sdao.getAllVehiclesFromDatabase();
}
catch(SQLException sqle)
{
logger.log(Level.SEVERE,String.format("SQL Exception while loading lists: %s", sqle.getMessage()));
}
catch(Exception e)
{
logger.log(Level.SEVERE,String.format("Exception while loading lists: %s", e.getMessage()));
}

}

//Method to be called when adding a customer to the database
//DO NOT MODIFY OR REMOVE
private void addCustomerToDatabase(Customer c)
{
ClerkDAO cdao = new ClerkDAO();
Logger logger = Logger.getLogger("wheeliesvehicalrentalspackage.WV RSApplication");
try{
StaffDAO sdao = new StaffDAO();
cdao.addCustomerToDatabase(c);
this.customerList = sdao.getAllCustomersFromDatabase();
}
catch(SQLException sqle)
{
logger.log(Level.SEVERE,String.format("SQL Exception while adding customer to database %s", sqle.getMessage()));
}
catch(Exception e)
{
logger.log(Level.SEVERE,String.format("Exception while adding customer to database %s", e.getMessage()));
}
}

//Method to be called when adding a vehicle to the database
//DO NOT MODIFY OR REMOVE
private void addVehicleToDatabase(Vehicle v)
{
ManagerDAO mdao = new ManagerDAO();
Logger logger = Logger.getLogger("wheeliesvehicalrentalspackage.WV RSApplication");
try{
mdao.addVehicleToDatabase(v);
}
catch(SQLException sqle)
{
logger.log(Level.SEVERE,String.format("SQL Exception while adding vehicle to database: %s", sqle.getMessage()));
}
catch(Exception e)
{
logger.log(Level.SEVERE,String.format("Exception while adding vehicle to database: %s", e.getMessage()));
}
}

//Method to be called when updating a customer in the database
//DO NOT MODIFY OR REMOVE
private void updateCustomerInDatabase(Customer c)
{
ClerkDAO cdao = new ClerkDAO();
Logger logger = Logger.getLogger("wheeliesvehicalrentalspackage.WV RSApplication");
try{
cdao.updateCustomerDetails(c);
}

catch(SQLException sqle)
{
logger.log(Level.SEVERE,String.format("SQL Exception while updating customer: %s", sqle.getMessage()));
}
catch(Exception e)
{
logger.log(Level.SEVERE,String.format("Exception while updating customer: %s", e.getMessage()));
}
}

//Method to be called when adding a vehicle in the database
//DO NOT MODIFY OR REMOVE
private void updateVehicleInDatabase(Vehicle v)
{
ManagerDAO mdao = new ManagerDAO();
Logger logger = Logger.getLogger("wheeliesvehicalrentalspackage.WV RSApplication");
try{
mdao.updateVehicleDetails(v);
}
catch(SQLException sqle)
{
logger.log(Level.SEVERE,String.format("SQL Exception while updating vehicle: %s", sqle.getMessage()));
}
catch(Exception e)
{
logger.log(Level.SEVERE,String.format("Exception while updating vehicle: %s", e.getMessage()));
}
}

//Method that handles the adding of a customer
//Note that this method must be written by the student
public void addCustomer(String firstName, String lastName, String address, String dateOfBirth, String phone, String email)
{
//Perform Validation
int errorVal = 0;
String errorMessage = "";
if(firstName.equals("") || firstName == null)
{
errorVal = errorVal+1;
errorMessage+="You must enter the customer's first name \n";
}
if(lastName.equals("") || lastName == null)
{
errorVal = errorVal+1;
errorMessage+="You must enter the customer's last name \n";
}
if(address.equals("") || address == null)
{
errorVal = errorVal+1;
errorMessage+="You must enter the customer's address \n";
}
try{
if(dateOfBirth.trim().equals("") || dateOfBirth.trim() == null)
{
throw new EmptyDateException("You must enter the customer's date of birth \n");
//errorMessage+="You must enter the customer's date of birth \n";
//errorVal = errorVal+1;
}
else
{
SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd");
java.sql.Date sqlCustDOB = new java.sql.Date(formatter.parse(dateOfBirth).getTime ());
if(!sqlCustDOB.toString().equals(dateOfBirth))
{
//errorMessage+="You must enter the customer's date of birth in the format yyyy-MM-dd \n";
//errorVal = errorVal+1;
throw new InvalidDateException("You must enter a Valid date in the format yyyy-MM-dd \n");
}
}

if(errorVal !=0)
{
JOptionPane.showMessageDialog(null,errorMessage);
}
else if(errorVal ==0)
{

//Convert dob to java.sql.Date
SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd");
java.sql.Date customerDOB = new java.sql.Date(formatter.parse(dateOfBirth).getTime ());

//Create customer object
Customer c = new Customer(firstName, lastName, address, dateOfBirth, phone, email);

//Add customer object to list
customerList.add(c);

//Pass the customer object to store in the database
addCustomerToDatabase(c);

//Show user confirmation message of adding customer successfully
JOptionPane.showMessageDialog(null,"Customer has been registered successfully!");
}

}
catch(EmptyDateException ide)
{
errorMessage+=ide.getMessage();
JOptionPane.showMessageDialog(null,errorMessage);
}
catch(InvalidDateException ide)
{
errorMessage+=ide.getMessage();
JOptionPane.showMessageDialog(null,errorMessage);
}
catch(IllegalArgumentException iae)
{
errorMessage+="You must enter the customer's date of birth in the format yyyy-MM-dd \n";
JOptionPane.showMessageDialog(null,errorMessage);
}
catch(java.text.ParseException pe)
{
errorMessage+="You must enter the customer's date of birth in the format yyyy-MM-dd \n";
JOptionPane.showMessageDialog(null,errorMessage);
}
catch(Exception e)
{
System.out.println(e);
}
}

//Method that handles the viewing of a customer
//Note that this method must be written by the student
public Customer viewCustomer(int custID)
{
//Create empty Customer object
Customer foundCustomer = new Customer();

//Loop through list and look for customer matching id passed
boolean found = false;
for(int x=0; x<customerList.size(); x++)
{
Customer c = customerList.get(x);
int customerID = c.getCustomerID();
//Check to see if the two ids match
if(custID == customerID)
{
foundCustomer = c;
found = true;
}
}

if(found == false)
{
JOptionPane.showMessageDialog(null,"No Customer Found!");
}

return foundCustomer;
}

//Method that handles the editing of a customer
//Note that this method must be written by the student
public void editCustomer(int custID, String firstName, String lastName, String address, String dateOfBirth, String phone, String email)
{
//Perform validation
int errorVal = 0;
String errorMessage = "";
if(firstName.equals("") || firstName == null)
{
errorVal = errorVal+1;
errorMessage+="You must enter the customer's first name \n";
}
if(lastName.equals("") || lastName == null)
{
errorVal = errorVal+1;
errorMessage+="You must enter the customer's last name \n";
}
if(address.equals("") || address == null)
{
errorVal = errorVal+1;
errorMessage+="You must enter the customer's address \n";
}
try{
if(dateOfBirth.trim().equals("") || dateOfBirth.trim() == null)
{
//errorMessage+="You must enter the customer's date of birth \n";
//errorVal = errorVal+1;
throw new EmptyDateException("You must enter the customer's date of birth \n");
}
else
{
java.text.SimpleDateFormat formatter = new java.text.SimpleDateFormat("yyyy-MM-dd");
java.sql.Date sqlCustDOB = new java.sql.Date(formatter.parse(dateOfBirth).getTime ());
if(!sqlCustDOB.toString().equals(dateOfBirth))
{
//errorMessage+="You must enter the customer's date of birth in the format yyyy-MM-dd \n";
//errorVal = errorVal+1;
throw new InvalidDateException("You must enter a Valid date in the format yyyy-MM-dd \n");
}
}

if(errorVal !=0)
{
JOptionPane.showMessageDialog(null,errorMessage);
}
else if(errorVal ==0)
{
//Convert dob to java.sql.Date
java.text.SimpleDateFormat formatter = new java.text.SimpleDateFormat("yyyy-MM-dd");
java.sql.Date customerDOB = new java.sql.Date(formatter.parse(dateOfBirth).getTime ());

//Loop through ArrayList to find the Customer object being edited
for(int x=0; x<customerList.size(); x++)
{
Customer c = customerList.get(x);
int customerID = c.getCustomerID();
//Check to see if the two ids match
if(custID == customerID)
{
//Edit customer fields of the oject in the ArrayList
customerList.get(x).setFirstName(firstName);
customerList.get(x).setLastName(lastName);
customerList.get(x).setAddress(address);
customerList.get(x).setDateOfBirth(customerDOB);
}

//Extract the edited customer object from the ArrayList
Customer editedCustomer = customerList.get(x);

//Pass customer object to update in the database
updateCustomerDetails(editedCustomer);
}

//Show user confirmation message of adding customer successfully
JOptionPane.showMessageDialog(null,"Customer has been updated successfully!");
}

}
catch(EmptyDateException ide)
{
errorMessage+=ide.getMessage();
JOptionPane.showMessageDialog(null,errorMessage);
}
catch(InvalidDateException ide)
{
errorMessage+=ide.getMessage();
JOptionPane.showMessageDialog(null,errorMessage);
}
catch(IllegalArgumentException iae)
{
errorMessage+="You must enter the customer's date of birth in the format yyyy-MM-dd \n";
JOptionPane.showMessageDialog(null,errorMessage);
}
catch(java.text.ParseException pe)
{
errorMessage+="You must enter the customer's date of birth in the format yyyy-MM-dd \n";
JOptionPane.showMessageDialog(null,errorMessage);
}
catch(Exception e)
{
System.out.println(e);
}

//Method that handles the adding of a vehicle
//Note that this method must be coded by the student
public void addVehicle(String regNo, String rentalPrice, String colour, String mpg, String transmission, String dateObtained, String avail, String model)
{

}

//Method that handles the viewing of a vehicle
//Note that this method must be written by the student
public Vehicle viewVehicle(String regNo)
{

}

//Method that handles the editing of a vehicle
//Note that this method must be code by the student
public void editVehicle(String regNo, String rentalPrice, String colour, String mpg, String transmission, String dateObtained, String avail, String model)
{

}

private void updateCustomerDetails(Customer editedCustomer) {
throw new UnsupportedOperationException("Not yet implemented");
}

}