Can not get data from mySql

Question

I prepared a GUI user connection application in NebBeans 5.5 accessing mySql database in the company server. The application run very well in desktop.
However, when I post it to the company server web, it gets nothing from the database.
Can any one give advice???
Thank you in advance.
The following is my application
import java.util.Vector;
import java.awt.event.*;
import java.awt.*;
import java.awt.event.*;
public class UserConnection extends javax.swing.JFrame {
//constants for database
private final String userName = "labmanage";
private final String password = "labmanage";
private final String server = "jdbc:mysql://svr.corp.com/labmanage";
private final String driver = "com.mysql.jdbc.Driver";
private JDBCAdapter data = new JDBCAdapter(server, driver, userName, password);
//variables
private String user, pwd;
private Vector<Vector<String>> userTable = new Vector<Vector<String>>();
private Vector<String>colUserNames = new Vector<String>();
* Creates new form UserConnection
public UserConnection() {
initComponents();
/** This method is called from within the constructor to
* initialize the form.
* WARNING: Do NOT modify this code. The content of this method is
* always regenerated by the Form Editor.
// <editor-fold defaultstate="collapsed" desc=" Generated Code ">
private void initComponents() {
userLabel = new javax.swing.JLabel();
pwdLabel = new javax.swing.JLabel();
userTextField = new javax.swing.JTextField();
passwordField = new javax.swing.JPasswordField();
submitButton = new javax.swing.JButton();
statusLabel = new javax.swing.JLabel();
jScrollPane1 = new javax.swing.JScrollPane();
statusTextArea = new javax.swing.JTextArea();
changePwdButton = new javax.swing.JButton();
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
setTitle("User's Connection");
setBackground(new java.awt.Color(153, 204, 255));
setCursor(new java.awt.Cursor(java.awt.Cursor.DEFAULT_CURSOR));
setFont(new java.awt.Font("aakar", 1, 12));
userLabel.setText("User Name:");
pwdLabel.setText("Password:");
submitButton.setText("Submit");
submitButton.addMouseListener(new java.awt.event.MouseAdapter() {
public void mouseClicked(java.awt.event.MouseEvent evt) {
submitButtonMouseClicked(evt);
submitButton.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
submitButtonActionPerformed(evt);
submitButton.addKeyListener(new java.awt.event.KeyAdapter() {
public void keyTyped(java.awt.event.KeyEvent evt) {
submitButtonKeyTyped(evt);
statusLabel.setText("Status:");
statusTextArea.setColumns(20);
statusTextArea.setEditable(false);
statusTextArea.setLineWrap(true);
statusTextArea.setRows(3);
statusTextArea.setText("Initial assigned password is \"dime\".");
statusTextArea.setWrapStyleWord(true);
jScrollPane1.setViewportView(statusTextArea);
changePwdButton.setText("Change password");
changePwdButton.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
changePwdButtonActionPerformed(evt);
org.jdesktop.layout.GroupLayout layout = new org.jdesktop.layout.GroupLayout(getContentPane());
getContentPane().setLayout(layout);
layout.setHorizontalGroup(
layout.createParallelGroup(org.jdesktop.layout.GroupLayout.LEADING)
.add(layout.createSequentialGroup()
.addContainerGap()
.add(layout.createParallelGroup(org.jdesktop.layout.GroupLayout.LEADING)
.add(userLabel)
.add(pwdLabel)
.add(statusLabel))
.add(35, 35, 35)
.add(layout.createParallelGroup(org.jdesktop.layout.GroupLayout.LEADING)
.add(layout.createSequentialGroup()
.add(submitButton)
.addPreferredGap(org.jdesktop.layout.LayoutStyle.RELATED)
.add(changePwdButton))
.add(passwordField, org.jdesktop.layout.GroupLayout.DEFAULT_SIZE, 230, Short.MAX_VALUE)
.add(userTextField, org.jdesktop.layout.GroupLayout.DEFAULT_SIZE, 230, Short.MAX_VALUE)
.add(org.jdesktop.layout.GroupLayout.TRAILING, jScrollPane1, org.jdesktop.layout.GroupLayout.DEFAULT_SIZE, 230, Short.MAX_VALUE))
.addContainerGap())
layout.setVerticalGroup(
layout.createParallelGroup(org.jdesktop.layout.GroupLayout.LEADING)
.add(layout.createSequentialGroup()
.addContainerGap()
.add(layout.createParallelGroup(org.jdesktop.layout.GroupLayout.BASELINE)
.add(userLabel)
.add(userTextField, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE, org.jdesktop.layout.GroupLayout.DEFAULT_SIZE, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE))
.addPreferredGap(org.jdesktop.layout.LayoutStyle.RELATED)
.add(layout.createParallelGroup(org.jdesktop.layout.GroupLayout.BASELINE)
.add(pwdLabel)
.add(passwordField, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE, org.jdesktop.layout.GroupLayout.DEFAULT_SIZE, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE))
.addPreferredGap(org.jdesktop.layout.LayoutStyle.RELATED)
.add(layout.createParallelGroup(org.jdesktop.layout.GroupLayout.LEADING)
.add(statusLabel)
.add(jScrollPane1, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE, org.jdesktop.layout.GroupLayout.DEFAULT_SIZE, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE))
.add(15, 15, 15)
.add(layout.createParallelGroup(org.jdesktop.layout.GroupLayout.BASELINE)
.add(submitButton)
.add(changePwdButton))
.addContainerGap(27, Short.MAX_VALUE))
pack();
}// </editor-fold>
private void submitButtonKeyTyped(java.awt.event.KeyEvent evt) {                                     
if(evt.getKeyCode() == KeyEvent.VK_ENTER) {
submitButton.doClick();
submitButton.requestFocus();
changePwdButton.requestFocus();
private void changePwdButtonActionPerformed(java.awt.event.ActionEvent evt) {                                               
String command = evt.getActionCommand();
if(command.equals("Change password")) {
passwordField.setText("");
//Get connection to the changing password panel
java.awt.EventQueue.invokeLater(new Runnable() {
public void run() {
new ChangePassword().setVisible(true);
private void submitButtonActionPerformed(java.awt.event.ActionEvent evt) {                                            
// TODO add your handling code here:
String command = evt.getActionCommand();
if(command.equals("Submit")) {
user = getUser();
pwd = getPwd();
data = new JDBCAdapter(server, driver, userName, password);
data.executeQuery("SELECT * FROM USERTABLE");
colUserNames = data.getColumnNames();
userTable = data.getDataTable();
if(colUserNames.elementAt(0).equals("")) {
statusTextArea.setText("Can not connect to database");
boolean checkUser = false;
int i = 0;
while(!checkUser && i<userTable.size()) {
if(user.equalsIgnoreCase((String) userTable.elementAt(i).elementAt(0))) {
//Find the user in database
checkUser = true;
//Check user's password
if(pwd.equals((String)userTable.elementAt(i).elementAt(1))) {
//Check for initial default password. The user is requested
//to change his password
if(pwd.equals((String) "dime")) {
statusTextArea.setText("You are requested to change your " +
"initial assigned password. Click 'Change password' please.");
else {
//Set UserConnection Panel to invisible
setVisible(false);
dispose();
//Get connection to the table
if(userTable.elementAt(i).elementAt(2).equals("0")) {
//Get connection to non-editable table
javax.swing.SwingUtilities.invokeLater(new Runnable() {
public void run() {
PVRackReportNonEdit rackReport = new PVRackReportNonEdit();
rackReport.createAndShowDialog();
else {
if(userTable.elementAt(i).elementAt(2).equals("1")) {
//Get connection to editable table
javax.swing.SwingUtilities.invokeLater(new Runnable() {
public void run() {
PVRackReport rackReport = new PVRackReport(user);
rackReport.createAndShowDialog();
//PVRackReport rackReport = new PVRackReport();
else statusTextArea.setText("You do not get approval for viewing data. " +
"Please contact the administrator for details.");
else {
passwordField.setText("");
statusTextArea.setText("Please enter corrected password or" +
"the administrator for details.");
i++;
if(!checkUser) {
passwordField.setText("");
statusTextArea.setText("Not find such user's name." +
"contact the admistrator for details.");
private void submitButtonMouseClicked(java.awt.event.MouseEvent evt) {                                         
// TODO add your handling code here:
* @param args the command line arguments
public static void main(String args[]) {
java.awt.EventQueue.invokeLater(new Runnable() {
public void run() {
new UserConnection().setVisible(true);
public String getUser() {
return userTextField.getText();
public String getPwd() {
return passwordField.getText();
// Variables declaration - do not modify
private javax.swing.JButton changePwdButton;
private javax.swing.JScrollPane jScrollPane1;
private javax.swing.JPasswordField passwordField;
private javax.swing.JLabel pwdLabel;
private javax.swing.JLabel statusLabel;
private javax.swing.JTextArea statusTextArea;
private javax.swing.JButton submitButton;
private javax.swing.JLabel userLabel;
private javax.swing.JTextField userTextField;
// End of variables declaration
Here is my JDBCAdapter
package rackdemo2;
* This is an adaptor which transforms the JDBC interface
* to the PVRackTableDialogue
import java.util.Vector;
import java.sql.*;
import javax.swing.table.AbstractTableModel;
import javax.swing.event.TableModelEvent;
public class JDBCAdapter {
Connection connection;
Statement statement;
ResultSet resultSet;
Vector<String> columnNames = new Vector<String>();
Vector<Vector<String>> rows = new Vector<Vector<String>>();
ResultSetMetaData metaData;
public JDBCAdapter(String url, String driverName,
String user, String passwd) {
try {
Class.forName(driverName);
connection = DriverManager.getConnection(url, user, passwd);
statement = connection.createStatement();
catch (ClassNotFoundException ex) {
System.err.println("Cannot find the database driver classes.");
System.err.println(ex);
catch (SQLException ex) {
System.err.println("Cannot connect to this database.");
System.err.println(ex);
public void executeQuery(String query) {
if (connection == null || statement == null) {
System.err.println("There is no database to execute the query.");
return;
try {
resultSet = statement.executeQuery(query);
metaData = resultSet.getMetaData();
int numberOfColumns = metaData.getColumnCount();
// Get the column names and cache them.
// Then we can close the connection.
for(int column = 0; column < numberOfColumns; column++) {
columnNames.addElement(metaData.getColumnLabel(column+1));
// Get all rows.
while (resultSet.next()) {
Vector<String> newRow = new Vector<String>();
for (int i = 1; i <= columnNames.size(); i++) {
String tempString = resultSet.getString(i);
if(!tempString.equals("null")) {
newRow.addElement(tempString);
else {
newRow.addElement("");
rows.addElement(newRow);
//Modify dataTable to add empty row to separate chassis
if(numberOfColumns>1) {
int nRow = rows.size();
Vector<String> row = new Vector<String>();
for(int i=0; i<numberOfColumns; i++){
row.add("");
if(nRow>0 || numberOfColumns>0) {
//Adding blank row to separate chassis
int i = 0;
while(i<nRow) {
if(!rows.elementAt(i).elementAt(0).equals("")) {
if(i>0) {
rows.add(i, row);
i++;
nRow = rows.size();
i++;
close();
catch (SQLException ex) {
System.err.println(ex);
public void close() throws SQLException {
resultSet.close();
statement.close();
connection.close();
// MetaData
public Vector<String> getColumnNames() {
return columnNames;
public Vector<Vector<String>> getDataTable() {
return rows;
public int getColumnCount() {
return columnNames.size();
// Data methods
public int getRowCount() {
return rows.size();
}

Answer 1

Thank you for your answer.
I'm very new to mySql as server. When I was assigned
to write the application, the administrator has set
up mySql database in the company web server for my
application. My program runs very when using my
workplace desktop with java web start or with java
web start in netbeans (all paths should be link to my
desktop hard disk, i.e. users/application/). I can
not run the application at home because I can not
access to the company intranet server (for security
purpose). The problem happens when I post the
application in the company web page (I have to modify
all paths in jnlp file to the company web address).
The program then runs without exception except it
seems that it gets no data from the database (for
example, when I type my username, it returns that
"There is no such user name. contact.." as what I
code in the application for not correcting user name)
It happens for not only using my company desktop but
also for others.
Please help me.
Thank you in advance.And all this could have been answered yesterday, in your other thread, when I asked you "Is the DB configured to allow that user to connect to the DB from where that user is attempting to connect from?"
Seeing as how you get that error, the obvious answer was, "No." At which point we could have continued.
Configure the needed users into the DB, without forgetting to allow them access from the machines from which they are going to access from.
Although, I agree with Rene, that you should set up a server of some sort, located on the same machine as the DB, for communicating with the DB.