Need help determining compiling error

Question

Good morning,
I need help finding the cause of a compiling error I receive. I have reviewed my code numerous times without any luck. I hope you guys might see something I am not! The entire file exceeds the limit I can post, so I am attaching it in 2 posts. Sorry for the inconvenience. The error and my code are posted below. Thank you for your help!
C:\StockTrackerDB.java:382: cannot find symbol
symbol : method add(java.lang.Boolean)
location: class java.util.ArrayList<java.lang.String>
               aList.add(new Boolean(rs.getBoolean("admin")));
^
1 error
Tool completed with exit code 1
import java.io.*;
import java.sql.*;
import java.util.*;
public class StockTrackerDB
     private Connection con = null;
     //Constructor; makes database connection
     public StockTrackerDB() throws ClassNotFoundException,SQLException
          if(con == null)
               String url = "jdbc:odbc:StockTracker";
               try
                    Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
               catch(ClassNotFoundException ex)
                    throw new ClassNotFoundException(ex.getMessage() +
                                "\nCannot locate sun.jdbc.odbc.JdbcOdbcDriver");
               try
                    con = DriverManager.getConnection(url);
               catch(SQLException ex)
                    throw new SQLException(ex.getMessage()+
                                "\nCannot open database connection for "+url);
     // Close makes database connection; null reference to connection
     public void close() throws SQLException,IOException,ClassNotFoundException
          con.close();
          con = null;
     // Method to serialize object to byte array
     private byte[] serializeObj(Object obj) throws IOException
          ByteArrayOutputStream baOStream = new ByteArrayOutputStream();
          ObjectOutputStream objOStream = new ObjectOutputStream(baOStream);
          objOStream.writeObject(obj); // object must be Serializable
          objOStream.flush();
          objOStream.close();
          return baOStream.toByteArray(); // returns stream as byte array
     // Method to deserialize bytes from a byte array into an object
     private Object deserializeObj(byte[] buf) throws IOException, ClassNotFoundException
          Object obj = null;
          if(buf != null)
               ObjectInputStream objIStream = new ObjectInputStream(new ByteArrayInputStream(buf));
               obj = objIStream.readObject(); //IOException, ClassNotFoundException
          return obj;
     // Methods for adding a record to a table
     // add to the Stocks Table
     public void addStock(String stockSymbol, String stockDesc) throws SQLException, IOException, ClassNotFoundException
          Statement stmt = con.createStatement();
          stmt.executeUpdate("INSERT INTO Stocks VALUES ('"
                                +stockSymbol+"'"
                                +",'"+stockDesc+"')");
          stmt.close();
     // add to the Users table
     public boolean addUser(User user) throws SQLException,IOException,ClassNotFoundException
          boolean result = false;
          String dbUserID;
          String dbLastName;
          String dbFirstName;
          Password dbPswd;
          boolean isAdmin;
          dbUserID = user.getUserID();
          if(getUser(dbUserID) == null)
               dbLastName = user.getLastName();
               dbFirstName = user.getFirstName();
               Password pswd = user.getPassword();
               isAdmin = user.isAdmin();
               PreparedStatement pStmt = con.prepareStatement("INSERT INTO Users VALUES (?,?,?,?,?)");
               pStmt.setString(1, dbUserID);
               pStmt.setString(2, dbLastName);
               pStmt.setString(3, dbFirstName);
               pStmt.setBytes(4, serializeObj(pswd));
               pStmt.setBoolean(5, isAdmin);
               pStmt.executeUpdate();
               pStmt.close();
               result = true;
          else
               throw new IOException("User exists - cannot add.");
          return result;
     // add to the UserStocks table
     public void addUserStocks(String userID, String stockSymbol)
                    throws SQLException,IOException,ClassNotFoundException
          Statement stmt = con.createStatement();
          stmt.executeUpdate("INSERT INTO UserStocks VALUES ('"
                                +userID+"'"
                                +",'"+stockSymbol+"')");
          stmt.close();
     // Methods for updating a record in a table
     // updating the Users table
     public boolean updUser(User user) throws SQLException, IOException, ClassNotFoundException
          boolean result = false;
          String dbUserID;
          String dbLastName;
          String dbFirstName;
          Password dbPswd;
          boolean isAdmin;
          dbUserID = user.getUserID();
          if(getUser(dbUserID) != null)
               dbLastName = user.getLastName();
               dbFirstName = user.getFirstName();
               Password pswd = user.getPassword();
               isAdmin = user.isAdmin();
               PreparedStatement pStmt = con.prepareStatement("UPDATE Users SET lastName = ?," + " firstName = ?, pswd = ?, admin = ? WHERE userID = ?");
               pStmt.setString(1, dbLastName);
               pStmt.setString(2, dbFirstName);
               pStmt.setBytes(3, serializeObj(pswd));
               pStmt.setBoolean(4, isAdmin);
               pStmt.setString(5, dbUserID);
               pStmt.executeUpdate();
               pStmt.close();
               result = true;
          else
               throw new IOException("User does not exist - cannot update.");
          return result;
     }

Answer 1

     // Methods for deleting a record from a table
     // delete a record from the Stocks table
     private void delStock(String stockSymbol) throws SQLException,IOException,ClassNotFoundException
          Statement stmt = con.createStatement();
          stmt.executeUpdate("DELETE FROM Stocks WHERE "
                                +"symbol = '"+stockSymbol+"'");
          stmt.close();
     // delete a record from the Users table
     public void delUser(User user) throws SQLException,IOException,ClassNotFoundException
          String dbUserID;
          String stockSymbol;
          Statement stmt = con.createStatement();
          try
               con.setAutoCommit(false);
               dbUserID = user.getUserID();
               if(getUser(dbUserID) != null) // verify user exists in database
                    ResultSet rs1 = stmt.executeQuery("SELECT userID, symbol "
                                          +"FROM UserStocks WHERE userID = '"+dbUserID+"'");
                    while(rs1.next())
                         try
                              stockSymbol = rs1.getString("symbol");
                              delUserStocks(dbUserID, stockSymbol);
                         catch(SQLException ex)
                              throw new SQLException("Deletion of user stock holding failed: " +ex.getMessage());
                    } // end of loop thru UserStocks
                    try
                    {  // holdings deleted, now delete user
                         stmt.executeUpdate("DELETE FROM Users WHERE "
                                          +"userID = '"+dbUserID+"'");
                    catch(SQLException ex)
                         throw new SQLException("User deletion failed: "+ex.getMessage());
               else
                    throw new IOException("User not found in database - cannot delete.");
               try
                    con.commit();
               catch(SQLException ex)
                    throw new SQLException("Transaction commit failed: "+ex.getMessage());
          catch (SQLException ex)
               try
                    con.rollback();
               catch (SQLException sqx)
                    throw new SQLException("Transaction failed then rollback failed: " +sqx.getMessage());
               // Transaction failed, was rolled back
               throw new SQLException("Transaction failed; was rolled back: " +ex.getMessage());
          stmt.close();
     // delete a record from the UserStocks table
     public void delUserStocks(String userID, String stockSymbol) throws SQLException,IOException,ClassNotFoundException
          Statement stmt = con.createStatement();
          ResultSet rs;
          stmt.executeUpdate("DELETE FROM UserStocks WHERE "
                                +"userID = '"+userID+"'"
                                +"AND symbol = '"+stockSymbol+"'");
          rs = stmt.executeQuery("SELECT symbol FROM UserStocks "
                                     +"WHERE symbol = '"+stockSymbol+"'");
          if(!rs.next()) // no users have this stock
               delStock(stockSymbol);
          stmt.close();
     // Methods for listing record data from a table
     // Ordered by:
     //          methods that obtain individual field(s),
     //          methods that obtain a complete record, and
     //          methods that obtain multiple records
     // Methods to access one or more individual fields
     // get a stock description from the Stocks table
     public String getStockDesc(String stockSymbol) throws SQLException, IOException, ClassNotFoundException
          Statement stmt = con.createStatement();
          String stockDesc = null;
          ResultSet rs = stmt.executeQuery("SELECT symbol, name FROM Stocks "
                                                  +"WHERE symbol = '"+stockSymbol+"'");
          if(rs.next())
               stockDesc = rs.getString("name");
          rs.close();
          stmt.close();
          return stockDesc;
     // Methods to access a complete record
     // get User data from the Users table
     public User getUser(String userID) throws SQLException,IOException,ClassNotFoundException
          Statement stmt = con.createStatement();
          String dbUserID;
          String dbLastName;
          String dbFirstName;
          Password dbPswd;
          boolean isAdmin;
          byte[] buf = null;
          User user = null;
          ResultSet rs = stmt.executeQuery("SELECT * FROM Users WHERE userID = '" +userID+"'");
          if(rs.next())
               dbUserID = rs.getString("userID");
               dbLastName = rs.getString("lastName");
               dbFirstName = rs.getString("firstName");
               // Do NOT use with JDK 1.2.2 using JDBC-ODBC bridge as
               // SQL NULL data value is not handled correctly.
               buf = rs.getBytes("pswd");
               dbPswd=(Password)deserializeObj(buf);
               isAdmin = rs.getBoolean("admin");
               user = new User(dbUserID,dbFirstName,dbLastName,dbPswd,isAdmin);
          rs.close();
          stmt.close();
          return user; // User object created for userID
     // Methods to access a list of records
     // get a list of selected fields for all records from the Users Table
     public ArrayList listUsers() throws SQLException,IOException,ClassNotFoundException
          ArrayList<String> aList = new ArrayList<String>();
          Statement stmt = con.createStatement();
          ResultSet rs = stmt.executeQuery("SELECT userID, firstName, lastName, admin "
                                             +"FROM Users ORDER BY userID");
          while(rs.next())
               aList.add(rs.getString("userID"));
               aList.add(rs.getString("firstName"));
               aList.add(rs.getString("lastName"));
               aList.add(new Boolean(rs.getBoolean("admin")));
          rs.close();
          stmt.close();
          return aList;
     // get all fields in all records for a given user from the UserStocks table
     public ArrayList listUserStocks(String userID) throws SQLException, IOException, ClassNotFoundException
          ArrayList<String> aList = new ArrayList<String>();
          Statement stmt = con.createStatement();
          ResultSet rs = stmt.executeQuery("SELECT * FROM UserStocks "
                                                  +"WHERE userID = '"+userID+"' ORDER BY symbol");
          while(rs.next())
               aList.add(rs.getString("symbol"));
          rs.close();
          stmt.close();
          return aList;
}