ActionPerformed exception

Question

I am trying to create a gui that uses a seperate class that accesses a database. The gui works fine, but when I try to write the code for the actionPerformed method, I keep getting errors for exceptions that the database class handles itself. I am unsure as to exactly what is going on here. Can anyone shed some light on the subject? the code for the actionPerformed method and the database class is as follows:
public class loginAction implements ActionListener {
     public void actionPerformed(ActionEvent action){               
               DBConnection loginConnection = new DBConnection();
               loginConnection.checkLogin(uName.getText(), pWord.getText());
import javax.swing.JOptionPane;
import java.sql.*;
public class DBConnection {
     private final String url = "jdbc:mysql://localhost:3306/vendor_proposal";
     private final String user = "newb@localhost";
     private final String password = "1234";
     Connection connect = null;
     //Default constructor that creates the connection to the database.
     public DBConnection() throws IllegalAccessException, InstantiationException, SQLException {
          try {
               Class.forName("com.mysql.jdbc.Driver").newInstance();
               connect = DriverManager.getConnection(url, user, password);
          }catch(SQLException e){
               JOptionPane.showMessageDialog(null, "Could not connect to the database.",
                         "Error!", JOptionPane.ERROR_MESSAGE);
               System.exit(0);
          }catch(Exception e){
               JOptionPane.showMessageDialog(null, "Error Occured while running the program.",
                         "Error!", JOptionPane.ERROR_MESSAGE);
     public void closeConnection() throws SQLException{
          try {
               connect.close();
          }catch(SQLException e){
               JOptionPane.showMessageDialog(null, "Error occured while accessing the database.",
                         "Error!", JOptionPane.ERROR_MESSAGE);
     public void checkLogin(String user, String password) throws SQLException{
          boolean passwordCheck = false;
          try{
               Statement stmt = connect.createStatement();
               String query = "select * from user_Accounts where username = '" + user +
               ResultSet rs = stmt.executeQuery(query);
               while (rs.next()){
                    int test;
                    test = password.compareTo(rs.getString("password"));
                    if (test == 0)
                         passwordCheck = true;
                    rs.close();
                    stmt.close();
          }catch(SQLException e){
               JOptionPane.showMessageDialog(null, "Error occured while accessing the " +
                         "database.", "Error!", JOptionPane.ERROR_MESSAGE);
          if (passwordCheck == true) {
               JOptionPane.showMessageDialog(null, "You have successfully logged into the " +
                         "system", "Login Successful!", JOptionPane.INFORMATION_MESSAGE);
          } else {
               JOptionPane.showMessageDialog(null, "Your login information was incorrect, " +
                         "please try again.", "Error!", JOptionPane.ERROR_MESSAGE);
Edited by: aserothbw on Aug 5, 2009 9:27 PM

Answer 1

public *class *loginAction *implements *ActionListener {
*public* *void* actionPerformed(ActionEvent action) *throws* SQLException{
//these two lines throw the unhandled exception error.
_DBConnection loginConnection = *new *DBConnection();_
_loginConnection.checkLogin(uName.getText(), pWord.getText());_
//this code compiles with no errors, and seems to run fine atm.
import javax.swing.JOptionPane;
import java.sql.*;
public *class *DBConnection {
*private* *final* String url = "jdbc:mysql://localhost:3306/vendor_proposal";
*private* *final* String user = "newb@localhost";
*private* *final* String password = "1234";
Connection connect = *null*;
//Default constructor that creates the connection to the database.
*public* DBConnection() *throws* IllegalAccessException, InstantiationException, SQLException {
*try* {
Class.+forName+("com.mysql.jdbc.Driver").newInstance();
connect = DriverManager.+getConnection+(url, user, password);
}*catch*(SQLException e){
JOptionPane.+showMessageDialog+(*null*, "Could not connect to the database.",
"Error!", JOptionPane.+ERROR_MESSAGE+);
System.+exit+(0);
}*catch*(Exception e){
JOptionPane.+showMessageDialog+(*null*, "Error Occured while running the program.",
"Error!", JOptionPane.+ERROR_MESSAGE+);
*public* *void* closeConnection() *throws* SQLException{
*try* {
connect.close();
}*catch*(SQLException e){
JOptionPane.+showMessageDialog+(*null*, "Error occured while accessing the database.",
"Error!", JOptionPane.+ERROR_MESSAGE+);
*public* *void* checkLogin(String user, String password) *throws* SQLException{
*boolean* passwordCheck = *false*;
*try*{
Statement stmt = connect.createStatement();
String query = "select * from user_Accounts where username = '" + user +
ResultSet rs = stmt.executeQuery(query);
*while* (rs.next()){
*int* test;
test = password.compareTo(rs.getString("password"));
*if* (test == 0)
passwordCheck = *true*;
rs.close();
stmt.close();
}*catch*(SQLException e){
JOptionPane.+showMessageDialog+(*null*, "Error occured while accessing the " +
"database.", "Error!", JOptionPane.+ERROR_MESSAGE+);
*if* (passwordCheck == *true*) {
JOptionPane.+showMessageDialog+(*null*, "You have successfully logged into the " +
"system", "Login Successful!", JOptionPane.+INFORMATION_MESSAGE+);
} *else* {
JOptionPane.+showMessageDialog+(*null*, "Your login information was incorrect, " +
"please try again.", "Error!", JOptionPane.+ERROR_MESSAGE+);