Help me debug jdbc code

Question

hi
can anyone help me debug my code? no compilation errors or exceptions thrown. but it's not working like i want it to
createAccount() calls insertAccount() which calls getNextID() which calls selectNextID()
this should create a new account, with an account id selected from the db and incremented +1. so if i create 100 accounts, it should number accounts 1-100, the lastkey table in the db should have a value 100 for account_lastkey when i'm done.
what happens is that 100 accounts are created, all with account number 0. somehow my getNextID() and selectNextID() methods are not working. please help
   * createAccount is used by administrator to add a new Account
   * in the system.
   * @param newAccount AccountEntryStruct containing data for new account
   * @return int the new unique Account ID
   * @exception com.kafein.idl.exceptions.DataValidationException
  public int createAccount(AccountEntryStruct newAccount) throws
    DataValidationException {
    validateData (newAccount); // throws DataValidationException;
    int accountID = 0;     
    // Create new Account.
    Account anAccount = new Account(accountID,
                        newAccount.userName,
                        newAccount.userEmail,
                        newAccount.creditCardType,
                        newAccount.creditCardNumber,
                        newAccount.creditCardExpirationDate.year,
                        newAccount.creditCardExpirationDate.month,
                        newAccount.userPassword,
                        newAccount.initialBalance);
    // Insert here / call method insertAccount() pass it in an account object
    // or call manager object - accountmanager.put()
    // Insert Account into Database
    try {
        insertAccount(anAccount);
    catch(Exception e) {
           e.printStackTrace();       
    accounts.put(accountID,anAccount);
    return accountID;
   * getNextID is used to generate a unique ID.
   * @return int an Account ID
  protected synchronized int getNextID() {
    int nextAccountID=0;
    try {
         nextAccountID = selectNextID();
    catch(Exception e) {
           e.printStackTrace();       
    return nextAccountID;
   * jdbc related methods
  private int selectNextID() throws Exception {
       int account_lastkey;
       try {
            Statement statement = connection.createStatement();
            ResultSet rs = statement.executeQuery(
                "Select ACCOUNT_LASTKEY from LASTKEY");
            System.out.println("Account Lastkey");
            //while (rs != null && rs.next()) {
             rs.next();
                account_lastkey = rs.getInt(1);
                System.out.println(account_lastkey);
            connection.commit();
            statement.close();
           //return account_lastkey;
           return account_lastkey;
        } catch(Exception e) {
            System.err.println("System Exception in selectNextID");
            System.err.println(e);
            throw e;
   * insertAccount is used to insert a new Account in the Database
   * @param int AccountID
   * @return AccountStruct containing data for the existing Account
  private void insertAccount(Account anAccount) throws Exception {
          AccountStruct anAccountStruct = anAccount.getAccountStruct();  
     String  acct_username    = anAccountStruct.userName;
        String  acct_useremail = anAccountStruct.userEmail;
     String  acct_cc_type = anAccountStruct.creditCardType;
        String  acct_cc_number = anAccountStruct.creditCardNumber;
     int acct_cc_expyr = anAccountStruct.creditCardExpirationDate.year;
        int acct_cc_expmo = anAccountStruct.creditCardExpirationDate.month;
        String  acct_userpassword = anAccountStruct.userPassword;
        float     acct_userbalance = anAccountStruct.accountBalance;
        int     acct_id = getNextID();
     try {
            System.out.println("Inserting data...");
            connection.setAutoCommit(false);
         // Calculate Start time
            Log.debug("Starting data insertion ( 1" +
                " row) into ACCOUNT table..");
            long startTime = System.currentTimeMillis();
            preparedStatement = connection.prepareStatement(
                "INSERT INTO ACCOUNT (ACCT_ID, ACCT_USERNAME, ACCT_USEREMAIL, ACCT_CC_TYPE, ACCT_CC_NUMBER, " +
                "ACCT_CC_EXPYR, ACCT_CC_EXPMO, ACCT_USERPASSWORD, ACCT_USERBALANCE) VALUES ( ?, ?, ?, ?, ?, ? , ?, ?, ?)");
                //acct_id  = 1000;
                preparedStatement.setInt(1, acct_id);
                preparedStatement.setString(2, acct_username);
                preparedStatement.setString(3, acct_useremail);
                preparedStatement.setString(4, acct_cc_type);
                preparedStatement.setString(5, acct_cc_number);
                preparedStatement.setInt(6, acct_cc_expyr);
                preparedStatement.setInt(7, acct_cc_expmo);
                preparedStatement.setString(8, acct_userpassword);
                preparedStatement.setFloat(9, acct_userbalance);
          preparedStatement.executeUpdate();
                connection.commit();
            preparedStatement = connection.prepareStatement(
                "UPDATE LASTKEY SET ACCOUNT_LASTKEY = ?");
            preparedStatement.setInt(1, acct_id);
          preparedStatement.executeUpdate();
                connection.commit();
         System.out.println("1 account created.");
            preparedStatement.close();
            long stopTime = System.currentTimeMillis();
            Log.debug("Account table load complete.");
            Log.debug("Load time = " +
                               ((stopTime - startTime)/(1000f)) + " seconds");
            Log.debug("Data insertion complete");
        } catch(Exception e) {
            System.err.println("System Exception in loadData");
            System.err.println(e);
            throw e;
 

Answer 1

thank you for responding!
well, i tried changine the line in createAccount() from int accountID=0; to intaccountID=1111;
this does not create 100 accounts with id 1111 - it still creates 100 accounts with id 0, so that's why, even though this method definitely needs work, i don't think that this is the line that's causing identical id's of 0 to be generated.