PrintWriter Problem

I am using netbeans IDE.
I am trying to print some values to an output file:
public static void storeToFile(Employee[] empArray, EmpAttributes checkIn)
 System.out.println("Storing....");
 PrintWriter storePay = null;
 try
 //file init
 storePay = new PrintWriter(new FileWriter("yourPay.txt"));
 storePay.println("DATE/TIME AT PRINT: " + new GregorianCalendar().getTime());
 for(int i = 0; i < total; i++)
 if(employeeArray.currStatus() == "Full-Time Employee")
storePay.println("----------------------------------");
storePay.println("Full-Time Employee");
storePay.println("Name: " + empArray[i].getName());
storePay.println("Address: " + empArray[i].getAddress());
catch(IOException expn)
System.out.println("Error...");
I am not sure why its not printing on the output file. There are no messages.

I did actually put that in a finally statement:
        finally
            if (storePay != null)
                System.out.println("Closing write output");
                storePay.close();
            }

Similar Messages

Problem with PrintWriter

Hi ,
I am using java1.4
I write following code.
Problem is : In the end new file is created , but it is empty nothing is written
in that file . Why ? line1 and line2 should be placed in the file , why it is not happening ?
import java.io.*;
class Test
     public static void main(String args[])
     try {
     File f = new File("test12.txt");
     if(!f.exists())
          f.createNewFile();
     FileWriter fw = new FileWriter(f);
PrintWriter pw = new PrintWriter(fw);
pw.println("line1");
     pw.println("line2");
     catch (Exception e)
          e.printStackTrace();
}

Double posted here
http://forum.java.sun.com/thread.jspa?threadID=783646&tstart=0

Problem with PrintWriter...HELP URGENT !!!

I am sending a String to the server using PrintWriter object.It is throwing NullPointer Exception while i try to,can u please help.
out.println(loginCommand); ///error occurs here
out.flush();
Please if someone can help.

DONT WORRY!!
The problem is probably very simple to solve. I'd recommend you check where you've initialised you PrintWriter Object (called 'out'). Make sure its been initialised (ie you've created it by calling 'new') otherwise don't be surprised if you receive this error.

Problems reading unicode characters with BufferedReader or PrintWriter

I am creating a pretty standard chat server and client with the exception that I want to be able to send special math symbols back and forth to aid in helping people with math homework. The unicode characters will appear on the buttons, in the textField (where users type in their messages), in the messageArea (where users see all of the messages) correctly. However, as soon as the server reads it, it is converted to a ? character by either the BufferedReader or the PrintWriter, but I am fairly certain it is the BufferedReader. All of the Sun examples I have read recommend doing exactly what I have done to be able to support unicode characters so I am somewhat at a loss. Any help would be appreciated. I will include all of the source code (which is rather large) but the main problem is the with the BufferedReader or PrintWriter when the servers reads the string in and then broadcasts it to all the clients (at least I'm pretty sure it is).
// ChatServer.java
import java.net.Socket;
import java.net.ServerSocket;
import java.io.InputStreamReader;
import java.io.BufferedReader;
import java.io.PrintWriter;
import java.io.IOException;
import java.util.Set;
import java.util.HashSet;
import java.util.HashMap;
import java.util.Iterator;
* A multithreaded chat room server. When a client connects the
* server requests a screen name by sending the client the
* text "SUBMITNAME", and keeps requesting a name until
* a unique one is received. After a client submits a unique
* name, the server acknowledges with "NAMEACCEPTED". Then
* all messages from that client will be broadcast to all other
* clients that have submitted a unique screen name. The
* broadcast messages are prefixed with "MESSAGE ".
* Because this is just a teaching example to illustrate a simple
* chat server, there are a few features that have been left out.
* Two are very useful and belong in production code:
* 1. The protocol should be enhanced so that the client can
* send clean disconnect messages to the server.
* 2. The server should do some logging.
public class ChatServer {
* The port that the server listens on.
private static final int PORT = 9001;
* The set of all names of clients in the chat room. Maintained
* so that we can check that new clients are not registering name
* already in use.
private static HashSet names = new HashSet();
* The set of all the print writers for all the clients. This
* set is kept so we can easily broadcast messages.
private static HashMap writers = new HashMap();
private static HashMap userSockets = new HashMap();
private static Set keys;
* The appplication main method, which just listens on a port and
* spawns handler threads.
public static void main(String[] args) throws Exception {
System.out.println("The chat server is running.");
ServerSocket listener = new ServerSocket(PORT);
try {
while (true) {
new Handler(listener.accept()).start();
     } catch (Exception e) {
} finally {
listener.close();
* A handler thread class. Handlers are spawned from the listening
* loop and are responsible for a dealing with a single client
* and broadcasting its messages.
private static class Handler extends Thread {
private String name;
private Socket socket;
private BufferedReader in;
private PrintWriter out;
* Constructs a handler thread, squirreling away the socket.
* All the interesting work is done in the run method.
public Handler(Socket socket) {
this.socket = socket;
public void disconnect(String userName) {
if (userName != null) {
names.remove(userName);
if (writers.get(userName) != null) {
writers.remove(userName);
try {
((Socket)userSockets.get(userName)).close();
} catch (IOException e) {
e.printStackTrace();
System.out.println(userName +" has disconnected from the Chat Server.");
keys = writers.keySet();
for (Iterator i = keys.iterator(); i.hasNext(); ) {
((PrintWriter)writers.get(i.next())).println(
"USERQUIT" +name);
public void disconnectAll() {
for (Iterator i = names.iterator(); i.hasNext();) {
String userName = i.next().toString();
if (!userName.equals("administrator")) {
names.remove(userName);
keys = writers.keySet();
for (Iterator it = keys.iterator(); it.hasNext(); ) {
((PrintWriter)writers.get(it.next())).println(
"USERQUIT" +name);
writers.remove(userName);
userSockets.remove(userName);
* Services this thread's client by repeatedly requesting a
* screen name until a unique one has been submitted, then
* acknowledges the name and registers the output stream for
* the client in a global set, then repeatedly gets inputs and
* broadcasts them.
public void run() {
try {
// Create character streams for the socket.
in = new BufferedReader(new InputStreamReader(
socket.getInputStream()));
out = new PrintWriter(socket.getOutputStream(), true);
// Request a name from this client. Keep requesting until
// a name is submitted that is not already used. Note that
// checking for the existence of a name and adding the name
// must be done while locking the set of names.
while (true) {
out.println("SUBMITNAME");
name = in.readLine();
if (name == null) {
return;
synchronized (names) {
if (!names.contains(name) && name.equalsIgnoreCase("administrator")) {
out.println("SUBMITPASSWORD");
String password = in.readLine();
if (password.equals("s3cure")) {
out.println("GRANTEDADMIN");
if (!names.contains(name)) {
names.add(name);
break;
// Now that a successful name has been chosen, add the
// socket's print writer to the set of all writers so
// this client can receive broadcast messages.
out.println("NAMEACCEPTED");
keys = writers.keySet();
for (Iterator i = keys.iterator(); i.hasNext(); ) {
((PrintWriter)writers.get(i.next())).println(
"USERJOIN" +name);
writers.put(name, out);
userSockets.put(name, socket);
System.out.println(name +" has successfully connected to the Chat Server.");
// Accept messages from this client and broadcast them.
// Ignore other clients that cannot be broadcasted to.
while (true) {
String input = in.readLine();
if (input == null) {
return;
          else if (input.startsWith("LISTUSERS")) {
               Iterator i = names.iterator();
               String namesString = new String();
               while (i.hasNext()) {
               namesString += " " +i.next();
               out.println("USERLIST " +namesString);
     catch (Exception e) {
     finally {
          disconnect(name);
// ChatClient.java
import java.util.HashSet;
import java.util.StringTokenizer;
import java.util.Iterator;
import java.util.LinkedList;
import java.util.ListIterator;
import java.awt.event.WindowEvent;
import java.awt.event.WindowAdapter;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.MouseListener;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.event.KeyListener;
import java.awt.event.KeyEvent;
import java.awt.Point;
import java.awt.Button;
import java.awt.Font;
import java.awt.BorderLayout;
import java.awt.FlowLayout;
import java.awt.Dimension;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JLabel;
import javax.swing.JTextField;
import javax.swing.JTextArea;
//import javax.swing.JTextPane;
import javax.swing.JScrollPane;
import javax.swing.JOptionPane;
import javax.swing.JList;
import javax.swing.DefaultListModel;
import javax.swing.JMenuBar;
import javax.swing.JMenu;
import javax.swing.JMenuItem;
import javax.swing.JPopupMenu;
import java.net.Socket;
import java.io.InputStreamReader;
import java.io.BufferedReader;
import java.io.PrintWriter;
import java.io.IOException;
* A simple Swing-based client for the chat server. Graphically
* it is a frame with a text field for entering messages and a
* textarea to see the whole dialog.
* The client follows the Chat Protocol which is as follows.
* When the server sends "SUBMITNAME" the client replies with the
* desired screen name. The server will keep sending "SUBMITNAME"
* requests as long as the client submits screen names that are
* already in use. When the server sends a line beginning
* with "NAMEACCEPTED" the client is now allowed to start
* sending the server arbitrary strings to be broadcast to all
* chatters connected to the server. When the server sends a
* line beginning with "MESSAGE " then all characters following
* this string should be displayed in its message area.
public class ChatClient {
BufferedReader in;
PrintWriter out;
JFrame frame = new JFrame("Math Chatter version 0.3");
JTextField textField = new JTextField(40);
JTextArea messageArea = new JTextArea(25, 40);
//JTextPane messageArea = new JTextPane();
// Menu
JMenuBar menuBar = new JMenuBar();
// File Menu and MenuItems
JMenu fileMenu = new JMenu();
JMenuItem connectMenuItem = new JMenuItem();
JMenuItem disconnectMenuItem = new JMenuItem();
JMenuItem exitMenuItem = new JMenuItem();
// Help Menu and MenuItems
JMenu helpMenu = new JMenu();
JMenuItem aboutMenuItem = new JMenuItem();
JOptionPane aboutDialog = new JOptionPane();
// Message Area Popup Menu and MenuItems
JPopupMenu messageAreaPopupMenu = new JPopupMenu();
JMenuItem connectPopupMenuItem = new JMenuItem();
JMenuItem disconnectPopupMenuItem = new JMenuItem();
JMenuItem clearTextMenuItem = new JMenuItem();
JMenuItem exitPopupMenuItem = new JMenuItem();
MouseListener messageAreaPopupListener = new messageAreaPopupListener();
// User Area Popup Menu and MenuItems
JPopupMenu userAreaPopupMenu = new JPopupMenu();
JMenuItem pingPopupMenuItem = new JMenuItem();
JMenuItem disconnectUserPopupMenuItem = new JMenuItem();
JMenuItem disconnectAllUsersPopupMenuItem = new JMenuItem();
MouseListener userAreaPopupListener = new userAreaPopupListener();
// Panel with textfield, send, and clear buttons
JPanel sendTextPanel = new JPanel();
// Panel that has all the math buttons
JPanel buttonPanel = new JPanel();
// Panel that has messageArea and users panell
JPanel displayPanel = new JPanel();
DefaultListModel listModel = new DefaultListModel();
JList userNamesList = new JList(listModel);
//JTextArea userNamesTextArea = new JTextArea(25, 10);
// buttonPanel stuff
Button sendButton = new Button();
Button clearButton = new Button();
Button infinityButton = new Button();
Button thetaButton = new Button();
Button limitButton = new Button();
Button thereforeButton = new Button();
JLabel buttonLabel = new JLabel("Useful math stuff: ");
HashSet usersHashSet = new HashSet();
LinkedList sentMessageList = new LinkedList();
ListIterator sentMessageIterator;
boolean isAdmin = false;
* Constructs the client by laying out the GUI and registering a
* listener with the textfield so that pressing Return in the
* listener sends the textfield contents to the server. Note
* however that the textfield is initially NOT editable, and
* only becomes editable AFTER the client receives the NAMEACCEPTED
* message from the server.
public ChatClient() {
// -----------------> Layout MenuBar
frame.setJMenuBar(menuBar);
fileMenu.setText("File");
connectMenuItem.setText("Connect");
connectMenuItem.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
showWhoopsDialog();
/*out.println("CONNECT");
try {
run();
catch (Exception ex) {
ex.printStackTrace();
fileMenu.add(connectMenuItem);
disconnectMenuItem.setText("Disconnect");
disconnectMenuItem.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
chatDisconnect();
fileMenu.add(disconnectMenuItem);
exitMenuItem.setText("Exit");
exitMenuItem.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
frame.dispose();
System.exit(0);
return;
fileMenu.add(exitMenuItem);
menuBar.add(fileMenu);
helpMenu.setText("Help");
aboutMenuItem.setText("About");
aboutMenuItem.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
aboutDialog.setDoubleBuffered(true);
aboutDialog.showMessageDialog(frame,
"Chat Server and Client were originally written by Ray Toal and were found at \n http://www.technocage.com/~ray/viewsource.jsp?java/networking/ChatServer.java and \n http://www.technocage.com/~ray/viewsource.jsp?java/networking/ChatClient.java. \n\n Math Chatter and all revisions have been done by William Ready.",
"About Math Chatter Server and Client version 0.3",
JOptionPane.INFORMATION_MESSAGE);
helpMenu.add(aboutMenuItem);
menuBar.add(helpMenu);
// -----------> End Menu
// -----------> Popup Menus
// -----------> Message Area Popup Menu
connectPopupMenuItem.setText("Connect");
connectPopupMenuItem.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
showWhoopsDialog();
disconnectPopupMenuItem.setText("Disconnect");
disconnectPopupMenuItem.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
chatDisconnect();
clearTextMenuItem.setText("Clear text");
clearTextMenuItem.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
messageArea.setText("");
exitPopupMenuItem.setText("Exit");
exitPopupMenuItem.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
frame.dispose();
System.exit(0);
messageAreaPopupMenu.add(connectPopupMenuItem);
messageAreaPopupMenu.add(disconnectPopupMenuItem);
messageAreaPopupMenu.add(clearTextMenuItem);
messageAreaPopupMenu.add(exitPopupMenuItem);
messageArea.addMouseListener(messageAreaPopupListener);
// -----------> End Message Area Popup Menu
// -----------> User Area Popup Menu
pingPopupMenuItem.setText("Ping User");
pingPopupMenuItem.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
//System.out.println("Yo yo yo");
disconnectUserPopupMenuItem.setText("Disconnect User");
disconnectUserPopupMenuItem.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
if (userNamesList.getSelectedValue() != null) {
//System.out.println("Yo yo yo");
out.println("DISCONNECTUSER " +userNamesList.getSelectedValue().toString());
//disconnectUserPopupMenuItem.setEnabled(false);
disconnectUserPopupMenuItem.setVisible(false);
disconnectAllUsersPopupMenuItem.setText("Disconnect All Users");
disconnectUserPopupMenuItem.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
if (userNamesList.getSelectedValue() != null) {
//System.out.println("Yo yo yo");
out.println("DISCONNECTALLUSERS");
//disconnectUserPopupMenuItem.setEnabled(false);
disconnectAllUsersPopupMenuItem.setVisible(false);
userAreaPopupMenu.add(pingPopupMenuItem);
userAreaPopupMenu.add(disconnectUserPopupMenuItem);
userAreaPopupMenu.add(disconnectAllUsersPopupMenuItem);
userNamesList.addMouseListener(userAreaPopupListener);
// -----------> End User Area Popup Menu
// -----------> End Popup Menus
// -----------> Layout GUI
textField.setEditable(false);
textField.requestDefaultFocus();
messageArea.setEditable(false);
sendTextPanel.setLayout(new FlowLayout());
sendTextPanel.add(textField);
sendButton.setLabel("Send");
sendButton.setEnabled(false);
sendTextPanel.add(sendButton);
clearButton.setLabel("Clear");
sendTextPanel.add(clearButton);
buttonPanel.setLayout(new FlowLayout());
buttonPanel.add(buttonLabel);
infinityButton.setLabel("\u221e");
buttonPanel.add(infinityButton);
     thetaButton.setLabel("\u03b8");
buttonPanel.add(thetaButton);
limitButton.setLabel("lim");
buttonPanel.add(limitButton);
thereforeButton.setLabel("\u2234");
buttonPanel.add(thereforeButton);
userNamesList.setVisibleRowCount(26);
userNamesList.setFixedCellWidth(110);
JScrollPane nameTextScrollPane = new JScrollPane(userNamesList);
JScrollPane messageAreaScrollPane = new JScrollPane(messageArea);
displayPanel.setLayout(new FlowLayout());
displayPanel.add(messageAreaScrollPane);
displayPanel.add(nameTextScrollPane);
frame.getContentPane().add(sendTextPanel, "North");
frame.getContentPane().add(displayPanel, "Center");
frame.getContentPane().add(buttonPanel, "South");
frame.pack();
// ---------------> Add Listeners
textField.addKeyListener(new KeyListener() {
public void keyPressed(KeyEvent e){ }
public void keyTyped(KeyEvent e){
if (e.getKeyChar() == KeyEvent.VK_UP) {
if (sentMessageIterator.hasNext()) {
textField.setText((String)sentMessageIterator.next());
if (e.getKeyChar() == KeyEvent.VK_DOWN) {
if (sentMessageIterator.hasPrevious()) {
textField.setText((String)sentMessageIterator.previous());
if (e.getKeyChar() == KeyEvent.VK_ENTER) {
String text = textField.getText();
if (text != null && !(text.equals(""))) {
sentMessageList.addFirst(textField.getText());
sentMessageIterator = sentMessageList.listIterator();
out.println(textField.getText());
textField.setText("");
public void keyReleased(KeyEvent e){}
sendButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
out.println(textField.getText());
textField.setText("");
textField.requestFocus();
clearButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
textField.setText("");
textField.requestFocus();
infinityButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
textField.setText(textField.getText() +"\u221e");
textField.requestFocus();
thetaButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
textField.setText(textField.getText() +"\u03b8");
textField.requestFocus();
limitButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
String limit = JOptionPane.showInputDialog(frame,
"Enter the value that the variable approaches. \n If the value is infinity, type in inf. \n (Note: the variable name is irrelevant)",
"Value that variable approaches",
JOptionPane.QUESTION_MESSAGE);
if (limit != null && limit.equalsIgnoreCase("inf"))
textField.setText(textField.getText() +"lim [x->\u221e] ");
else if (limit != null)
textField.setText(textField.getText() +"lim [x->" +limit +"] ");
textField.requestFocus();
thereforeButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
textField.setText(textField.getText() +"\u2234");
textField.requestFocus();
// -------------> End Listeners
// -------------> End GUI
* Prompt for and return the address of the server.
private String getServerAddress() {
return JOptionPane.showInputDialog(
frame,
"Enter IP Address of the Server:",
"Welcome to the Chatter",
JOptionPane.QUESTION_MESSAGE);
private void showWhoopsDialog() {
JOptionPane.showMessageDialog(frame,
"Unfortunately this feature has not been implemented yet. \n The only way to connect currently is to exit the program \n and start it again",
"Whoops!",
JOptionPane.ERROR_MESSAGE);
private void chatDisconnect() {
messageArea.append("You have disconnected from the Chat Server\n");
textField.setEditable(false);
messageArea.setEnabled(false);
userNamesList.setEnabled(false);
fileMenu.requestFocus();
out.println("DISCONNECT");
* Prompt for and return the desired screen name.
private String getName() {
return JOptionPane.showInputDialog(
frame,
"Choose a screen name:",
"Screen name selection",
JOptionPane.PLAIN_MESSAGE);
private String getPassword() {
return JOptionPane.showInputDialog(
frame,
"Type in your password:",
"Password Input",
JOptionPane.PLAIN_MESSAGE);
* Connects to the server then enters the processing loop.
private void run() throws IOException {
// Make connection and initialize streams
String serverAddress = getServerAddress();
if (serverAddress != null && !(serverAddress.equals(""))) {
Socket socket = new Socket(serverAddress, 9001);
in = new BufferedReader(new InputStreamReader(
socket.getInputStream()));
out = new PrintWriter(socket.getOutputStream(), true);
// Process all messages from server, according to the protocol.
while (true) {
try {
String line = in.readLine();
if (line.startsWith("SUBMITNAME")) {
out.println(getName());
          } else if (line.startsWith("NAMEACCEPTED")) {
textField.setEditable(true);
          out.println("LISTUSERS");
sendButton.setEnabled(true);
//messageArea.setEnabled(true);
} else if (line.startsWith("SUBMITPASSWORD")) {
out.println(getPassword());
} else if (line.startsWith("GRANTEDADMIN")) {
isAdmin = true;
//disconnectUserPopupMenuItem.setEnabled(true);
disconnectUserPopupMenuItem.setVisible(true);
disconnectAllUsersPopupMenuItem.setVisible(true);
} else if (line.startsWith("DISCONNECT")) {
sendButton.setEnabled(false);
return;
} else if (line.startsWith("USERLIST")) {
          StringTokenizer st = new StringTokenizer(line.substring(8), " ");
          while (st.hasMoreTokens()) {
          usersHashSet.add(st.nextToken());
listModel.removeAllElements();
for (Iterator i = usersHashSet.iterator(); i.hasNext(); ) {
          listModel.addElement(i.next());
} else if (line.startsWith("USERJOIN")) {
          String userJoinName = line.substring(8).trim();
          usersHashSet.add(userJoinName);
          listModel.addElement(userJoinName);
} else if (line.startsWith("USERQUIT")) {
          String userQuitName = line.substring(8).trim();
          usersHashSet.remove(userQuitName);
listModel.removeElement(userQuitName);
} else if (line.startsWith("MESSAGE")) {
messageArea.setFont(new Font("Lucida Sans", Font.PLAIN, 12));
messageArea.append(line.substring(8) + "\n");
catch (Exception e) {
//e.printStackTrace();
return;
* Runs the client as an application with a closeable frame.
public static void main(String[] args) throws Exception {
ChatClient client = new ChatClient();
client.frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
client.frame.setLocation(200, 100);
client.frame.show();
client.run();
class messageAreaPopupListener extends MouseAdapter {
public void mousePressed(MouseEvent e) {
maybeShowPopup(e);
public void mouseReleased(MouseEvent e) {
maybeShowPopup(e);
private void maybeShowPopup(MouseEvent e) {
if (e.isPopupTrigger()) {
messageAreaPopupMenu.show(e.getComponent(),
e.getX(), e.getY());
class userAreaPopupListener extends MouseAdapter {
public void mousePressed(MouseEvent e) {
maybeShowPopup(e);
public void mouseReleased(MouseEvent e) {
maybeShowPopup(e);
private void maybeShowPopup(MouseEvent e) {
if (e.isPopupTrigger()) {
userAreaPopupMenu.show(e.getComponent(),
e.getX(), e.getY());

Yes, the code is large, isn't it. It is a good idea, when you have a problem you can't solve, to remove unnecessary code. When the problem disappears, then you know the code you just removed was probably the source of the problem.
But in your case, I think that none of the 1000 lines of code you posted are the problem. You appear to be using Lucida Sans, which is a positive sign; it can render many of the characters you have hard-coded in your program. But apparently the problem is with characters that are coming from somewhere else? And you are using a PrintWriter to send them there and a BufferedReader to get them back? These convert your data from characters to bytes and back again using the default encoding for your system. Chances are that this encoding is some "extended ASCII" encoding that doesn't know how to map anything above \u00ff. You need to get an InputStreamReader and an OutputStreamWriter into your transmission. (Wrap your socket.getInputStream() in an InputStreamReader and wrap that in a BufferedReader, etc.) These objects can take an encoding name as their second parameter; try "UTF-8" or "UTF8" for the encoding. Their API documentation has a link to a page about encodings; follow that if you need more info.

Having problems PrintWriter and new lines in a string

I apologise if this topic is in the wrong place, but this is my first time asking on these forums.
At the moment I have a window with an output text area which I want to store the contents of into a file. I use getText() to store the contents to a string, and then write the string to a file using a BufferedWriter. the code is as follows:
BufferedWriter out = new BufferedWriter(new FileWriter(file));
String contents = output.getText();
out.write(contents);
out.close();The file-name is specified by a FileChooser. All of this works fine, and the text is actually written to the file ok, except that there are no line breaks in it (it's just one continual line of text). I have tried the same process using a string containing "test\ntest" to see if it is just a problem getting the contents of the text area, however it still gives me the same problem.
Any help on this would be much appreciated.

Take a look at PrintWriter.
o See if you can wrap it around a BufferedWriter. (It
may alrady BE one.)
o Use it's .println(...) method.That'll still make it appear as one line though. The one-and-only "line" will have the correct platform-specific line terminator (\r\n I suppose), but the string he is writing has embedded \n characters in it, which he is expecting to show up as new lines.
The OP needs to realize that there really aren't any such thing as "lines". It's all up to the software rendering the text to treat "newline" characters/sequences special. If you were to open that file with a different tool (not Notepad, which only recognizes \r\n as newline sequences), it may display it the way you are expecting.
Or, you'll have to parse the text and convert it to the proper newline sequences before you write it to the file.

Problem with threads running javaw

Hi,
Having a problem with multi thread programming using client server sockets. The program works find when starting the the application in a console using java muti.java , but when using javaw multi.java the program doesnt die and have to kill it in the task manager. The program doesnt display any of my gui error messages either when the server disconnect the client. all works find in a console. any advice on this as I havent been able to understand why this is happening? any comment would be appreciated.
troy.

troy,
Try and post a minimum code sample of your app which
does not work.
When using javaw, make sure you redirect the standard
error and standard output streams to file.
Graeme.Hi Graeme,
I dont understand what you mean by redirection to file? some of my code below.
The code works fine under a console, code is supposed to exit when the client (the other server )disconnects. the problem is that but the clientworker side of the code still works. which under console it doesnt.
public class Server{
ServerSocket aServerSocket;
Socket dianosticsSocket;
Socket nPortExpress;
ClientListener aClientListener;
LinkedList queue = new LinkedList();
int port = 0;
int clientPort = 0;
String clientName = null;
boolean serverAlive = true;
* Server constructor generates a server
* Socket and then starts a client threads.
* @param aPort      socket port of local machine.
public Server(int aPort, String aClientName, int aClientPort){
port = aPort;
clientName = aClientName;
clientPort = aClientPort;
try{
// create a new thread
aServerSocket = new ServerSocket(port) ;
// connect to the nPortExpress
aClientListener = new ClientListener(InetAddress.getByName(clientName), clientPort, queue,this);
// aClientListener.setDaemon(true);
aClientListener.start();
// start a dianostic port
DiagnosticsServer aDiagnosticsServer = new DiagnosticsServer(port,queue,aClientListener);
// System.out.println("Server is running on port " + port + "...");
// System.out.println("Connect to nPort");
catch(Exception e)
// System.out.println("ERROR: Server port " + port + " not available");
JOptionPane.showMessageDialog(null, (e.toString()),"ERROR: Server port " + port + " not available", JOptionPane.ERROR_MESSAGE);
serverAlive = false;
System.exit(1);
while(serverAlive&&aClientListener.hostSocket.isConnected()){
try{
// connect the client
Socket aClient = aServerSocket.accept();
//System.out.println("open client connection");
//System.out.println("client local: "+ aClient.getLocalAddress().toString());
// System.out.println("client localport: "+ aClient.getLocalPort());
// System.out.println("client : "+ aClient.getInetAddress().toString());
// System.out.println("client port: "+ aClient.getLocalPort());
// make a new client thread
ClientWorker clientThread = new ClientWorker(aClient, queue, aClientListener, false);
// start thread
clientThread.start();
catch(Exception e)
//System.out.println("ERROR: Client connection failure");
JOptionPane.showMessageDialog(null, (e.toString()),"ERROR: Client connection failure", JOptionPane.ERROR_MESSAGE);
}// end while
} // end constructor Server
void serverExit(){
     JOptionPane.showMessageDialog(null, "Server ","ERROR: nPort Failure", JOptionPane.ERROR_MESSAGE);
     System.exit(1);
}// end class Server
*** connect to another server
public class ClientListener extends Thread{
InetAddress hostName;
int hostPort;
Socket hostSocket;
BufferedReader in;
PrintWriter out;
boolean loggedIn;
LinkedList queue;      // reference to Server queue
Server serverRef; // reference to main server
* ClientListener connects to the host server.
* @param aHostName is the name of the host eg server name or IP address.
* @param aHostPort is a port number of the host.
* @param aLoginName is the users login name.
public ClientListener(InetAddress aHostName, int aHostPort,LinkedList aQueue,Server aServer)      // reference to Server queue)
hostName = aHostName;
hostPort = aHostPort;
queue = aQueue;
serverRef = aServer;
// connect to the server
try{
hostSocket = new Socket(hostName, hostPort);
catch(IOException e){
//System.out.println("ERROR: Connection Host Failed");
JOptionPane.showMessageDialog(null, (e.toString()),"ERROR: Connection to nPort Failed", JOptionPane.ERROR_MESSAGE);
System.exit(0);
} // end constructor ClientListener
** multi client connection server
ClientWorker(Socket aSocket,LinkedList aQueue, ClientListener aClientListener, boolean diagnostics){
queue = aQueue;
addToQueue(this);
client = aSocket;
clientRef = aClientListener;
aDiagnostic = diagnostics;
} // end constructor ClientWorker
* run method is the main loop of the server program
* in change of handle new client connection as well
* as handle all messages and errors.
public void run(){
boolean alive = true;
String aSubString = "";
in = null;
out = null;
loginName = "";
loggedIn = false;
while (alive && client.isConnected()&& clientRef.hostSocket.isConnected()){
try{
in = new BufferedReader(new InputStreamReader(client.getInputStream()));
out = new PrintWriter(new OutputStreamWriter(client.getOutputStream()));
if(aDiagnostic){
out.println("WELCOME to diagnostics");
broadCastDia("Connect : diagnostics "+client.getInetAddress().toString());
out.flush();
else {
out.println("WELCOME to Troy's Server");
broadCastDia("Connect : client "+client.getInetAddress().toString());
     out.flush();
String line;
while(((line = in.readLine())!= null)){
StringTokenizer aStringToken = new StringTokenizer(line, " ");
if(!aDiagnostic){
broadCastDia(line);
clientRef.sendMessage(line); // send mesage out to netExpress
out.println(line);
out.flush();
else{
if(line.equals("GETIPS"))
getIPs();
else{
clientRef.sendMessage(line); // send mesage out to netExpress
out.println(line);
out.flush();
} // end while
catch(Exception e){
// System.out.println("ERROR:Client Connection reset");
                         JOptionPane.showMessageDialog(null, (e.toString()),"ERROR:Client Connection reset", JOptionPane.ERROR_MESSAGE);
try{
if(aDiagnostic){
broadCastDia("Disconnect : diagnostics "+client.getInetAddress().toString());
out.flush();
else {
broadCastDia("Disconnect : client "+client.getInetAddress().toString());
     out.flush();
// close the buffers and connection;
in.close();
out.close();
client.close();
// System.out.println("out");
// remove from list
removeThreadQueue(this);
alive = false;
catch(Exception e){
// System.out.println("ERROR: Client Connection reset failure");
JOptionPane.showMessageDialog(null, (e.toString()),"ERROR: Client Connection reset failure", JOptionPane.ERROR_MESSAGE);
}// end while
} // end method run
* method run - Generates io stream for communicating with the server and
* starts the client gui. Run also parses the input commands from the server.
public void run(){
boolean alive = true;
try{
// begin to life the gui
// aGuiClient = new ClientGui(hostName.getHostName(), hostPort, loginName, this);
// aGuiClient.show();
in = new BufferedReader(new InputStreamReader(hostSocket.getInputStream()));
out = new PrintWriter(new OutputStreamWriter(hostSocket.getOutputStream()));
while (alive && hostSocket.isConnected()){
String line;
while(((line = in.readLine())!= null)){
System.out.println(line);
broadCast(line);
} // end while
} // end while
catch(Exception e){
//     System.out.println("ERRORa Connection to host reset");
JOptionPane.showMessageDialog(null, (e.toString()),"ERROR: Connection to nPort reset", JOptionPane.ERROR_MESSAGE);
try{
hostSocket.close();
     }catch(Exception a){
     JOptionPane.showMessageDialog(null, (a.toString()),"ERROR: Exception", JOptionPane.ERROR_MESSAGE);
alive = false;
System.exit(1);
} // end method run

A web developer problem while running a web application

Hi all,
I'm novice to J2EE.
I've encountered a problem while accessing the deployed module in weblogic 8.1 server.
I'm sure that the webapplication module is deployed as i saw my module in administration console & also the status said that it is deployed.
when i access my web application by specifying the proper server and port no and context root it is showing
either 505 - resource not found error(http://localhost:7001/Suresh-2/Suresh) or 404 - not found error.( http://localhost:7001/Suresh-2/Suresh)
Now let me elaborate what i've done till now.
My webapplication folder structure is : C:\bea\user_projects\domains\mydomain\applications\Suresh\WEB-INF\classes\Sai\ServExamp.class
My servlet is ServExamp.java
I created a folder called "Suresh". In that folder created another folder called "WEB-INF". In WEB-INF created a folder called "Classes".
Since my servlet is in package "Sai", the .class file reside in \Suresh\WEB-INF\Classes\Sai\ServExamp.class
The source code is :
package Sai;
import javax.servlet.*;
import javax.servlet.http.*;
import java.io.*;
public class ServExamp extends HttpServlet
public void doPost(HttpServletRequest req,HttpServletResponse res)throws IOException
PrintWriter out=res.getWriter();
java.util.Date today=new java.util.Date();
out.println("<html>"+"<body>"+
"<h1 align=center>HF\'s Chapter1 Servlet </h1>"
+" "+today+"</body>"+"</html>");
Now i'm almost done creating a web application. Next, I constructed a simple web.xml descriptor that gives a web friendly name for my servlet, and points to the servlet. I constructed web.xml descriptor file in the WEB-INF folder (C:\bea\user_projects\domains\mydomain\applications\Suresh\WEB-INF\).
The web.xml file source is :
<!DOCTYPE web-app
PUBLIC "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"
"http://java.sun.com/dtd/web-app_2_3.dtd">
<web-app>
<display-name>Hello World Web Application</display-name>
<description>Test Servlet</description>
<servlet>
<servlet-name>ServExamp</servlet-name>
<servlet-class>Sai.ServExamp</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>ServExamp</servlet-name>
<url-pattern>/Suresh</url-pattern>
</servlet-mapping>
</web-app>
Now I have told Weblogic that the URI /Suresh corresponds to my servlet "Sai.ServExamp".
My Web Application is ready to be deployed at this point. I logged onto Weblogic's admin console,
1) clicked on deployments, then navigated to "Web Application Modules" .
2) Clicked "Deploy new Web Application Module"
3) Navigated to the location of your web application folder (Suresh). There was a radio button next to it indicating that I can select that folder as a valid web application.
4) I Clicked that radio button and clicked "Target Module".
5) It informed that my web application "Suresh" will be deployed to myServer.It asked a name for my web application deployment. By default it was "Suresh"
I clicked Deploy.
6) After deployment, my web application "Suresh" appeared in the "Web Application Modules" tree on the left.
I Clicked on "Suresh"( my web application) then clicked the testing tab, then clicked the link shown there(http://localhost:7001/Suresh-2).
It was not showing my servlet (showed a 403 error)
Error - 403
This status code is commonly used when the server does not wish to reveal exactly why the request has been refused, or when no other response is applicable.
I think so it came b'coz I don't have an index.html or index.jsp page.
7)Instead,I added my servlet on to the URL it provided.
http://localhost:7001/Suresh-2/Suresh
It is showing these error code: Http: 505 resource not allowed
The page cannot be displayed
The page you are looking for cannot be displayed because the address is incorrect.
Please try the following:
If you typed the page address in the Address bar, check that it is entered correctly.
Open the localhost:7001 home page and then look for links to the information you want.
Click Search to look for information on the Internet.
when i just type : http://localhost:7001/ -> Error 404 not found error
it's showing
Error 404--Not Found
From RFC 2068 Hypertext Transfer Protocol -- HTTP/1.1:
10.4.5 404 Not Found
The server has not found anything matching the Request-URI. No indication is given of whether the condition is temporary or permanent.
If the server does not wish to make this information available to the client, the status code 403 (Forbidden) can be used instead. The 410 (Gone) status code SHOULD be used if the server knows, through some internally configurable mechanism, that an old resource is permanently unavailable and has no forwarding address.
I want to run my web application & any help would be appreciated.
Thanks in advance.
with regards,
S.SayeeNarayanan.
Note: I even deployed my war file, which i got by execution of (jar cv0f webapp.war . ) command from the root directory of my web application i.e. Suresh
Then executed my webapplication it is showing
error-505 resource not allowed.
--------------------------------------------------------------------------------------------

try a fully qualified path to the pem file

Problem with ArrayList

Hello,
I am having a problem with a program I am trying to write. The idea of the program is to:
A) read a list of movies list from a text file
B) create an object for each movie using the information from the text file
C) place the objects into an arrayList
My problem is that when I check my arrayList it seems to only contain multiple copies of the first movie read from the text file. Here is my code
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.io.PrintWriter;
import java.io.FileOutputStream;
import java.io.FileNotFoundException;
import java.util.ArrayList;
public class MovieReader
 PrintWriter outputStream = null;
 public void readFile()
 try
 BufferedReader in = new BufferedReader(new FileReader("movie.txt"));
 String str;
 while ((str = in.readLine()) != null)
 process(str);
 in.close();
 catch (IOException e)
 e.printStackTrace();
 ArrayList <ValidMovie> movieList = new ArrayList<ValidMovie>();
 private void process(String line)
 String[] array = line.split("\t");
 int i = 0;
 for ( i = 0; i < array.length; i++)
 String tempTitle = array[0];
 String tempYear = array [1];
 String tempRating = array [2];
 String tempFormat = array [3];
 ValidMovie uuj = new ValidMovie(tempTitle, tempYear, tempRating, tempFormat);
 movieList.add(uuj);
 System.out.println("item at index 1 is: " + movieList.get(1));
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 private void writeFile(String [] arrayL)
 String [] arrayWrite = arrayL;
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
//$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$
 public static void main(String[] args)
 MovieReader mv = new MovieReader();
 mv.readFile();
//$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$
}This is the code that creates an object for each movie:
import java.io.Serializable;
public class ValidMovie implements Serializable
 private String title;
 private String year;
 private String rating;
 private String format;
 public ValidMovie()
 public ValidMovie(String tTitle, String tYear, String tRating, String tFormat)
 title = tTitle;
 year = tYear;
 rating = tRating;
 format = tFormat;
 //Getters for title, year, rating and format
 public String getTitle ()
 return title;
 public String getYear ()
 return year;
 public String getRating ()
 return rating;
 public String getFormat ()
 return format;
 public String toString ()
 return title + "\t" + year + "\t" + rating + "\t" + format;
}The following is what I have in the movie.txt file:
Bamboozled 2000 2 DVD
What Lies Beneath 2000 1.5 DVD
Beneath the Planet of the Apes 1970 1 DVD
You Can Count On Me 2000 3.5 Theater
And finally this is the result when I run the code:
item at index 1 is: Bamboozled 2000 2 DVD
item at index 1 is: Bamboozled 2000 2 DVD
item at index 1 is: Bamboozled 2000 2 DVD
item at index 1 is: Bamboozled 2000 2 DVD
I am sure that it is something simple that I am overlooking but I cannot figure it out. When I change the index in the code:
System.out.println("item at index 1 is: " + movieList.get(1));to 0 or 2 or 3 then result is the same, it will just show the first movie in the text file. Any help would be greatly appreciated. Thanks

Thanks for the reply, it helped but I am now getting 4 of each of the movies after adding you suggestion. This is much better now I just need to figure out why the loop is causing the extra copies. Thanks again :)
Item 0: Bamboozled 2000 2 DVD
Item 1: Bamboozled 2000 2 DVD
Item 2: Bamboozled 2000 2 DVD
Item 3: Bamboozled 2000 2 DVD
Item 4: What Lies Beneath 2000 1.5 DVD
Item 5: What Lies Beneath 2000 1.5 DVD
Item 6: What Lies Beneath 2000 1.5 DVD
Item 7: What Lies Beneath 2000 1.5 DVD
Item 8: Beneath the Planet of the Apes 1970 1 DVD
Item 9: Beneath the Planet of the Apes 1970 1 DVD
Item 10: Beneath the Planet of the Apes 1970 1 DVD
Item 11: Beneath the Planet of the Apes 1970 1 DVD
Item 12: You Can Count On Me 2000 3.5 Theater
Item 13: You Can Count On Me 2000 3.5 Theater
Item 14: You Can Count On Me 2000 3.5 Theater
Item 15: You Can Count On Me 2000 3.5 Theater

Connection Problem while client is behind proxy and server out side proxy

hello
i implemented ChatApplication in JAVA, for that i used socket connection when client and server both are in same network then it's working fine.
but when my server is on internate and client is behind proxy and try to connect with server
it not able to connect i get exception.
i serch most of forum i got same answer and i try it but i was not success.
any kind of help is appriciated.
i attached my code(which i implement for testing ) pls reply me
thanks in advance.
Server.java
import java.lang.*;
import java.io.*;
import java.net.*;
class Server {
   public static void main(String args[]) {
      String data = "you are successfully connected with server.";
      try {
         ServerSocket srvs = new ServerSocket(1234);
         Socket skt = srvs.accept();
         System.out.print("Server has connected!\n");
         PrintWriter out = new PrintWriter(skt.getOutputStream(), true);
         System.out.print("Sending string: '" + data + "\n");
         out.print(data);
         out.close();
         skt.close();
         srvs.close();
      catch(Exception e) {
         System.out.print("Whoops! It didn't work!\n");
ProxyClient.java
import java.io.*;
import java.net.*;
import java.util.*;
class ProxyClient{
   public static void main(String args[]) {
     String host="61.17.212.29";
     int port=1234;
           String line;
     Properties properties = System.getProperties();
     /*properties.put("firewallSet", "true");
     properties.put("firewallHost", "192.168.0.1");
     properties.put("firewallPort", "808");*/
     properties.put("socksProxySet","true");
     properties.put("socksProxyHost", "192.168.0.1");
     properties.put("socksProxyPort", "1080");
     System.setProperties (properties);
     try {
     /*SocketAddress addr = new InetSocketAddress("192.168.0.1", 1080);
     Proxy proxy = new Proxy(Proxy.Type.SOCKS, addr);
     Socket skt = new Socket(proxy);
     InetSocketAddress dest = new InetSocketAddress("61.17.212.29",1234);
     skt.connect(dest);*/
         System.out.println("before socket taken");
         Socket skt = new Socket(host,port);
         System.out.println("after socket taken");
         BufferedReader networkBin = new BufferedReader(new InputStreamReader(skt.getInputStream()));
         System.out.println("Received string: '");
         line = networkBin.readLine();     // Read one line
      while(true)
             System.out.println(line);     // Output the line
             line = networkBin.readLine(); // Read the next line, if any
      catch(Exception e) {
         System.out.print("Whoops! It didn't work!\n");
     e.printStackTrace();
}

Now look here. I could not care less about this
code. I don't know anything about it, I don't
want to know, I have already recommended you don't
use it, and I have also given you a simpler and
better solution. If you don't want to take my advice
that is your privilege and your problem.ya i has understand system propertis i have setted and u can see it in the code i have tried by both system properties and also J2SE 5.0 proxy class but i got a same problem malformed Exception server refuse to connection.
is there any problem at sever side?
can u tell me in which way u r teling to set the propery i m looking forward for ur reply.
ya i m sure u will give me.................reply "ejp".
Thnx in advance.

Problem sending email using javamail in servlet

I try this code and make some changes of my own http://forums.sun.com/thread.jspa?threadID=695781.
When i run the program the confirmtaion shows that the mail has been sent, but when i check in my inbox there's no the message. I'm using gmail and need to authenticate the username and password. I guess the error caused in the servlet.
Here's the code for my servlet :
import java.io.*;
import java.util.Properties;
import javax.servlet.*;
import javax.servlet.http.*;
import javax.mail.internet.*;
import javax.mail.*;
public class ServletEx extends HttpServlet {
   public void doPost(HttpServletRequest request, HttpServletResponse response)
         throws IOException, ServletException {
      System.out.println("____emailservlet.doPost");
      response.setContentType("text/plain");
      PrintWriter out = response.getWriter();
      System.out.println("______________________________");
      out.println();
      String to = request.getParameter("to");
      System.out.println("____________________________to" + to);
      String subject = request.getParameter("subject");
      String msg = request.getParameter("msg");
      // construct an instance of EmailSender
      System.out.println("servlet_to" + to);
      send(username, to, subject, msg);
      //send("[email protected]", to, subject, msg);
      out.println("mail sent....");
        String username = "[email protected]";
        String password = "my_password";
        String smtp = "smtp.gmail.com";
        String port = "587";
   public void send(String username, String to, String subject, String msg) {
        Properties props = new Properties();
        props.put("mail.smtp.user", username);
        props.put("mail.smtp.host", smtp);
        props.put("mail.smtp.port", port);
        props.put("mail.smtp.starttls.enable","true"); // just in case, but not currently necessary, oddly enough
        props.put("mail.smtp.auth", "true");
        //props.put("mail.smtp.debug", "true");
        props.put("mail.smtp.socketFactory.port", port);
        props.put("mail.smtp.socketFactory.class", "javax.net.ssl.SSLSocketFactory");
        props.put("mail.smtp.socketFactory.fallback", "false");
        SecurityManager security = System.getSecurityManager();
        try
            Authenticator auth = new SMTPAuthenticator();
            Session session = Session.getInstance(props, auth);
            //session.setDebug(true);
            MimeMessage message = new MimeMessage(session);
            message.setText(msg);
            message.setSubject(subject);
            message.setFrom(new InternetAddress(username));
            message.addRecipient(Message.RecipientType.TO, new InternetAddress(to));
            Transport.send(message);
        catch (Exception mex)
            mex.printStackTrace();
   public class SMTPAuthenticator extends javax.mail.Authenticator {
        public PasswordAuthentication getPasswordAuthentication(String username, String password)
            return new PasswordAuthentication(username, password);
}Actually it's been a long time for me to develope this program, especially with the authenticate smtp. Any help would be very appreciated :)

Accordingly to your stackTrace, I think that you miss some utility jar from Geronimo app. server.
As you are using Application server that is J2EE compliant, so there is an own JavaMail implementation embeded and used by the Server. To fix this problem you have to find and add to your calsspath a jar-file that contains Base64EncoderStream.class

Compatibility problem (or?)

(hey ho, I'm a complete newbie)
I wrote a client-server pair in java (or rather, I more or less copied code from the tutorial). The client is an applet. Now, the client works splendid for me, but (as so often) it doesn't work at all for my friends. They all have java installed, and they can run other (and much more complex) applets, so what could be the problem? I'll just post the code so that you can see for yourselves (and yes, I know it looks horrid, it's just a test; I'm a complete newbie, remember?)
import java.io.*;
import java.net.*;
import java.applet.Applet;
import java.awt.TextField;
import java.awt.TextArea;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
public class KFClient extends Applet implements ActionListener, Runnable {
     Thread com;
     Socket socket = null;
     PrintWriter out = null;
     BufferedReader in = null;
     String response;
     TextField inputField;
     TextArea displayA;
     public void init() {
          inputField = new TextField(60);
          inputField.addActionListener(this);
          displayA = new TextArea(20, 60);
          displayA.setEditable(false);
          add(inputField);
          add(displayA);
     public void start() {
          if (com == null) {
               com = new Thread(this);
          com.start();
     public void run() {
          try {
               socket = new Socket("x.x.x.x", 4444);
               out = new PrintWriter(socket.getOutputStream(), true);
               in = new BufferedReader(new InputStreamReader(socket.getInputStream()));
               while ((response = in.readLine()) != null) {
                    displayA.appendText(response + "\n");
                    if (response.equals("/quit")) break;
               out.close();
               in.close();
               socket.close();
          } catch (Exception e) {
                        displayA.appendText("ok, something went wrong!");
     public void actionPerformed(ActionEvent e) {
          out.println(inputField.getText());
          inputField.setText(null);
}

Ask your friends to turn on the java console in their browsers.
Then they can see the error messages and report them back to you.

Problem with writing and reading using serialization

I am having a problem with writing and reading an object that has another object in it. The purpose of the class is to write a order that has multiple items in it. And there will be several orders. This is for an IB project, where one of the requirements is to utilize a hierarchical composite data structure. That is, it is "one that contains more than one element and at least one of the elements is a composite data structure. Examples are, an array or linked list of records, a record that has one field that is another record, or an array". The code is shown below:
The error produced is
java.lang.NullPointerException
 at SamsonRubberIndustries.CustomerOrderDetails.createCustOrdDetailsScreen(CustomerOrderDetails.java:150)
 at SamsonRubberIndustries.CustomerOrderDetails$1.run(CustomerOrderDetails.java:78)
 at java.awt.event.InvocationEvent.dispatch(Unknown Source)
 at java.awt.EventQueue.dispatchEvent(Unknown Source)
 at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
 at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
 at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
 at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
 at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
 at java.awt.EventDispatchThread.run(Unknown Source)
public class CustOrdObject implements Serializable {
 public int CustID;
 public int CustOrderID;
 public Object OrderDate;
 public InnerCustOrdObject[] innerCustOrdObj;
 public float GrandTotal;
 public int MaxItems;
 public CustOrdObject() {}
 public CustOrdObject(InnerCustOrdObject[] innerCustOrdObj,
int CustID, int CustOrderID, Object OrderDate,
float GrandTotal, int innerarrlength, int innerarrpos, int MaxItems) {
 this.CustID = CustID;
 this.CustOrderID = CustOrderID;
 this.OrderDate = OrderDate;
 this.GrandTotal = GrandTotal;
 this.MaxItems = MaxItems;
 this.innerCustOrdObj = new InnerCustOrdObject[MaxItems];
 public InnerCustOrdObject[] getInnerCustOrdObj() {
 return innerCustOrdObj;
 public void setInnerCustOrdObj(InnerCustOrdObject[] innerCustOrdObj) {
 this.innerCustOrdObj = innerCustOrdObj;
 public int getCustID() {
 return CustID;
 public void setCustID(int custID) {
 CustID = custID;
 public int getCustOrderID() {
 return CustOrderID;
 public void setCustOrderID(int custOrderID) {
 CustOrderID = custOrderID;
 public Object getOrderDate() {
 return OrderDate;
 public void setOrderDate(Object orderDate) {
 OrderDate = orderDate;
 public void setGrandTotal(float grandTotal) {
 GrandTotal = grandTotal;
 public float getGrandTotal() {
 return GrandTotal;
 public int getMaxItems() {
 return MaxItems;
 public void setMaxItems(int maxItems) {
 MaxItems = maxItems;
public class InnerCustOrdObject implements Serializable{
 public int ItemNumber;
 public float UnitPrice;
 public int QuantityRequired;
 public float TotalPrice;
 public InnerCustOrdObject() {}
 public InnerCustOrdObject(int ItemNumber, float
UnitPrice, int QuantityRequired, float TotalPrice){
 this.ItemNumber = ItemNumber;
 this.UnitPrice = UnitPrice;
 this.QuantityRequired = QuantityRequired;
 this.TotalPrice = TotalPrice;
 public int getItemNumber() {
 return ItemNumber;
 public void setItemNumber(int itemNumber) {
 ItemNumber = itemNumber;
 public int getQuantityRequired() {
 return QuantityRequired;
 public void setQuantityRequired(int quantityRequired) {
 QuantityRequired = quantityRequired;
 public float getTotalPrice() {
 return TotalPrice;
 public void setTotalPrice(float totalPrice) {
 TotalPrice = totalPrice;
 public float getUnitPrice() {
 return UnitPrice;
 public void setUnitPrice(float unitPrice) {
 UnitPrice = unitPrice;
import java.awt.*;
import java.awt.event.*;
import java.io.*;
import java.text.SimpleDateFormat;
import java.util.Date;
import javax.swing.*;
import javax.swing.table.DefaultTableCellRenderer;
import javax.swing.table.DefaultTableModel;
public class CustomerOrderDetails extends CommonFeatures{
 //TODO
 private static int MAX_ORDERS = 200;
 private static int MAX_ORDERITEMS = 100;
 private static int MaxRecord;
 private static int CurrentRecord = 1;
 private static int currentItem;
 private static int MaxItems;
 private static boolean FileExists, recFileExists;
 private static CustOrdObject[] orderDetails = new CustOrdObject[MAX_ORDERS];
 private static InnerCustOrdObject[] innerCustOrdObj = new InnerCustOrdObject[MAX_ORDERITEMS];
 private static File OrderDetailsFile = new File("CustOrdDetails.dat");
 private static File OrdRecordNumStore = new File("OrdRecordNumStore.txt");
 private static PrintWriter writeFile;
 private static BufferedReader readFile;
 private static ObjectOutputStream objOut;
 private static ObjectInputStream objIn;
 //Set format for date
 SimpleDateFormat simpleDF = new SimpleDateFormat("dd MM yyyy");
 //--<BEGINNING>--Declaring Interface Variables------------------------------------------//
 private JPanel innertoppanel, innercenterpanel, innerbottompanel, innerrightpanel, innerleftpanel;
 private JLabel CustIDLbl, CustOrderIDLbl, OrderedDateLbl, GrandTotLbl, ItemNumberLbl,UnitPriceLbl, QuantityReqLbl, TotPriceLbl;
 private JTextField CustIDTxt, CustOrderIDTxt, OrderedDateTxt, GrandTotTxt, ItemNumberTxt, UnitPriceTxt, QuantityReqTxt, TotPriceTxt;
 private JButton addrecordbtn, savebtn, externalprevbtn, externalnextbtn, internalprevbtn, internalnextbtn, gotorecordbtn, additemreqbtn;
 //--<END>--Declaring Interface Variables------------------------------------------------//
 public static void main(String[] args) {
 final CustomerOrderDetails COD = new CustomerOrderDetails();
 java.awt.EventQueue.invokeLater(new Runnable() {
 public void run() {
 try {
 UIManager.setLookAndFeel("com.sun.java.swing.plaf.windows.WindowsLookAndFeel");
 COD.createCustOrdDetailsScreen();
 } catch (Exception eb) {
 eb.printStackTrace();
 //--<BEGINNING>--Creating CustomerOrderDetails Screen---------------------------------------//
 public JFrame createCustOrdDetailsScreen() {
 createDefaultFrame();
 mainframe.setSize(800,500);
 createContainerPanel();
 containerpanel.add(createCustOrdDetailsTitle(), BorderLayout.NORTH);
 containerpanel.add(createCustOrdDetailsMainPanel(), BorderLayout.CENTER);
 //containerpanel.add(createCustOrdDetailsLeftNavButtons(), BorderLayout.WEST);
 //containerpanel.add(createCustOrdDetailsRightNavButtons(), BorderLayout.EAST);
 containerpanel.add(createCustOrdDetailsButtons(), BorderLayout.SOUTH);
 mainframe.setContentPane(containerpanel);
 mainframe.setLocationRelativeTo(null);
 mainframe.setVisible(true);
 //--<BEGINNING>--Checks to see whether CRecordNumberStore file exists-------------------------------//
 if (OrdRecordNumStore.exists() == true) {
 recFileExists = true;
 }else {
 recFileExists = false;
 if (recFileExists == true) {
 MaxRecord = readRecordNumber();
 CurrentRecord = MaxRecord;
 //readOrder();
 //readInnerOrderRecord(CurrentRecord);
 System.out.println("Current Record " +CurrentRecord);
 System.out.println("Max Record " +MaxRecord);
 }else{
 MaxRecord = 1;
 writeRecordNumber(MaxRecord);
 CustOrderIDTxt.setText(""+MaxRecord);
 System.out.println("Current Record " +CurrentRecord);
 System.out.println("Max Record " +MaxRecord);
 //--<END>--Checks to see whether CRecordNumberStore file exists--------------------------------------//
 if(readOrder() != null){
 orderDetails = (CustOrdObject[]) readOrder();
 innerCustOrdObj = orderDetails[CurrentRecord].getInnerCustOrdObj();
 MaxItems = orderDetails[CurrentRecord].getMaxItems();
 if(CurrentRecord > 1 && CurrentRecord < MaxRecord){
 externalnextbtn.setEnabled(true);
 externalprevbtn.setEnabled(true);
 if(CurrentRecord >= MaxRecord){
 externalnextbtn.setEnabled(false);
 getFieldText(CurrentRecord-1);
 }else{
 orderDetails[CurrentRecord] = new CustOrdObject();
 currentItem = 1;
 return mainframe;
 //--<END>--Creating CustomerOrderDetails Screen---------------------------------------------//
 public JPanel createCustOrdDetailsTitle(){
 createTitlePanel();
 titlepanel.setBackground(TxtfontColor);
 label.setText("- Customer Order Details -");
 labelpanel.setBackground(TxtfontColor);
 label.setForeground(Color.white);
 createbuttonpanel();
 buttonpanel.setBackground(TxtfontColor) ;
 buttonpanel.add(createReturnToMainMenuButton());
 titlepanel.add(labelpanel, BorderLayout.WEST);
 titlepanel.add(buttonpanel, BorderLayout.EAST);
 return titlepanel;
 public JPanel createCustOrdDetailsMainPanel(){
 createmainpanel();
 mainpanel.setBackground(TxtfontColor);
 mainpanel.setLayout(new BorderLayout());
 mainpanel.setBorder(BorderFactory.createTitledBorder(""));
 mainpanel.add(createInnerTopPanel(), BorderLayout.NORTH);
 mainpanel.add(createInnerCenterPanel(), BorderLayout.CENTER);
 mainpanel.add(createInnerBottomPanel(), BorderLayout.SOUTH);
 mainpanel.add(createInnerRightPanel(), BorderLayout.EAST);
 mainpanel.add(createInnerLeftPanel(), BorderLayout.WEST);
 return mainpanel;
 public JPanel createInnerTopPanel(){
 innertoppanel = new JPanel(new GridBagLayout());
 innertoppanel.setBackground(TxtfontColor);
 GridBagConstraints GBC = new GridBagConstraints();
 GBC.fill = GridBagConstraints.HORIZONTAL;
 //Setting Font Type and Size
 Font font = new Font("Arial", Font.BOLD, 11);
 CustIDLbl = new JLabel("Customer ID");
 CustIDLbl.setBorder(BorderFactory.createEmptyBorder(10,10,10,10));
 CustIDLbl.setFont(font);
 CustIDLbl.setForeground(LblfontColor);
 GBC.gridx = 1;
 GBC.gridy = 1;
 innertoppanel.add(CustIDLbl, GBC);
 CustIDTxt = new JTextField(20);
 CustIDTxt.setEditable(true);
 GBC.gridx = 2;
 GBC.gridy = 1;
 innertoppanel.add(CustIDTxt, GBC);
 GBC.gridx = 3;
 GBC.gridy = 1;
 innertoppanel.add(Box.createHorizontalStrut(220), GBC);
 OrderedDateLbl = new JLabel("Order Date");
 OrderedDateLbl.setBorder(BorderFactory.createEmptyBorder(10,10,10,10));
 OrderedDateLbl.setFont(font);
 OrderedDateLbl.setForeground(LblfontColor);
 GBC.gridx = 4;
 GBC.gridy = 1;
 innertoppanel.add(OrderedDateLbl, GBC);
 //Get today's date
 Date todaydate = new Date();
 OrderedDateTxt = new JTextField(simpleDF.format(todaydate), 20);
 OrderedDateTxt.setHorizontalAlignment(JTextField.CENTER);
 OrderedDateTxt.setEditable(false);
 GBC.gridx = 5;
 GBC.gridy = 1;
 innertoppanel.add(OrderedDateTxt, GBC);
 CustOrderIDLbl = new JLabel("Customer Order ID");
 CustOrderIDLbl.setBorder(BorderFactory.createEmptyBorder(10,10,10,10));
 CustOrderIDLbl.setFont(font);
 CustOrderIDLbl.setForeground(LblfontColor);
 GBC.gridx = 1;
 GBC.gridy = 2;
 innertoppanel.add(CustOrderIDLbl, GBC);
 CustOrderIDTxt = new JTextField(20);
 CustOrderIDTxt.setEditable(false);
 GBC.gridx = 2;
 GBC.gridy = 2;
 innertoppanel.add(CustOrderIDTxt, GBC);
 return innertoppanel;
 public JPanel createInnerCenterPanel(){
 innercenterpanel = new JPanel(new GridBagLayout());
 innercenterpanel.setBackground(TxtfontColor);
 innercenterpanel.setBorder(BorderFactory.createLoweredBevelBorder());
 GridBagConstraints GBC = new GridBagConstraints();
 GBC.fill = GridBagConstraints.HORIZONTAL;
 //Setting Font Type and Size
 Font font = new Font("Arial", Font.BOLD, 11);
 ItemNumberLbl = new JLabel("Item Number");
 ItemNumberLbl.setBorder(BorderFactory.createEmptyBorder(10,10,10,10));
 ItemNumberLbl.setFont(font);
 ItemNumberLbl.setForeground(LblfontColor);
 GBC.gridx = 1;
 GBC.gridy = 1;
 innercenterpanel.add(ItemNumberLbl, GBC);
 ItemNumberTxt = new JTextField(20);
 GBC.gridx = 2;
 GBC.gridy = 1;
 innercenterpanel.add(ItemNumberTxt, GBC);
 UnitPriceLbl = new JLabel("Unit Price");
 UnitPriceLbl.setBorder(BorderFactory.createEmptyBorder(10,10,10,10));
 UnitPriceLbl.setFont(font);
 UnitPriceLbl.setForeground(LblfontColor);
 GBC.gridx = 1;
 GBC.gridy = 2;
 innercenterpanel.add(UnitPriceLbl, GBC);
 UnitPriceTxt = new JTextField(20);
 //UnitPriceTxt.setEditable(false);
 GBC.gridx = 2;
 GBC.gridy = 2;
 innercenterpanel.add(UnitPriceTxt, GBC);
 QuantityReqLbl = new JLabel("Quantity Required");
 QuantityReqLbl.setBorder(BorderFactory.createEmptyBorder(10,10,10,10));
 QuantityReqLbl.setFont(font);
 QuantityReqLbl.setForeground(LblfontColor);
 GBC.gridx = 1;
 GBC.gridy = 3;
 innercenterpanel.add(QuantityReqLbl, GBC);
 QuantityReqTxt = new JTextField(20);
 //QuantityReqTxt.setEditable(false);
 GBC.gridx = 2;
 GBC.gridy = 3;
 innercenterpanel.add(QuantityReqTxt, GBC);
 TotPriceLbl = new JLabel("Total Price");
 TotPriceLbl.setBorder(BorderFactory.createEmptyBorder(10,10,10,10));
 TotPriceLbl.setFont(font);
 TotPriceLbl.setForeground(LblfontColor);
 GBC.gridx = 1;
 GBC.gridy = 4;
 innercenterpanel.add(TotPriceLbl, GBC);
 TotPriceTxt = new JTextField(20);
 //TotPriceTxt.setEditable(false);
 GBC.gridx = 2;
 GBC.gridy = 4;
 innercenterpanel.add(TotPriceTxt, GBC);
 return innercenterpanel;
 public JPanel createInnerBottomPanel(){
 innerbottompanel = new JPanel(new FlowLayout(FlowLayout.RIGHT));
 innerbottompanel.setBackground(TxtfontColor);
 //Setting Font Type and Size
 Font font = new Font("Arial", Font.BOLD, 11);
 GrandTotLbl = new JLabel("Grand Total");
 GrandTotLbl.setBorder(BorderFactory.createEmptyBorder(10,10,10,10));
 GrandTotLbl.setFont(font);
 GrandTotLbl.setForeground(LblfontColor);
 innerbottompanel.add(GrandTotLbl);
 innerbottompanel.add(Box.createHorizontalStrut(30));
 GrandTotTxt = new JTextField(20);
 innerbottompanel.add(GrandTotTxt);
 return innerbottompanel;
 public JPanel createInnerRightPanel(){
 innerrightpanel = new JPanel(new FlowLayout(FlowLayout.CENTER));
 innerrightpanel.setBackground(TxtfontColor);
 innerrightpanel.setLayout(new BoxLayout(navrightpanel, BoxLayout.Y_AXIS));
 innerrightpanel.setBorder(BorderFactory.createLoweredBevelBorder());
 innerrightpanel.setLayout(new GridBagLayout());
 GridBagConstraints GBC = new GridBagConstraints();
 GBC.fill = GridBagConstraints.HORIZONTAL;
 internalnextbtn = new JButton(createNextButtonIcon());
 GBC.gridx = 1;
 GBC.gridy = 1;
 internalnextbtn.addActionListener(new ActionListener(){
 public void actionPerformed(ActionEvent evt){
 //getInnerFieldText(currentItem);
 internalprevbtn.setEnabled(true);
 if(currentItem < MaxItems){
 ++CurrentRecord;
 //readOrder();
 //readInnerOrderRecord(CurrentRecord);
 setInnerFieldText(currentItem);
 System.out.println(CurrentRecord);//Checking RECORD_NUM
 if(currentItem == MaxItems){
 internalnextbtn.setEnabled(false);
 innerrightpanel.add(internalnextbtn, GBC);
 return innerrightpanel;
 public JPanel createInnerLeftPanel(){
 innerleftpanel = new JPanel(new FlowLayout(FlowLayout.CENTER));
 innerleftpanel.setBackground(TxtfontColor);
 innerleftpanel.setBorder(BorderFactory.createLoweredBevelBorder());
 innerleftpanel.setForeground(Color.BLACK);
 innerleftpanel.setLayout(new GridBagLayout());
 GridBagConstraints GBC = new GridBagConstraints();
 GBC.fill = GridBagConstraints.HORIZONTAL;
 internalprevbtn = new JButton(createPreviousButtonIcon());
 GBC.gridx = 1;
 GBC.gridy = 1;
 internalprevbtn.addActionListener(new ActionListener(){
 public void actionPerformed(ActionEvent evt){
 //getInnerFieldText(currentItem);
 internalnextbtn.setEnabled(true);
 if(currentItem == 1){
 internalprevbtn.setEnabled(false);
 if(currentItem > 0){
 --currentItem;
 //readOrder();
 setInnerFieldText(currentItem);
 innerleftpanel.add(internalprevbtn, GBC);
 return innerleftpanel;
 public JPanel createCustOrdDetailsButtons(){
 createbuttonpanel();
 buttonpanel.setBackground(TxtfontColor);
 externalprevbtn = new JButton(createPreviousButtonIcon());
 externalprevbtn.addActionListener(new ActionListener(){
 public void actionPerformed(ActionEvent evt){
 getFieldText(CurrentRecord);
 externalnextbtn.setEnabled(true);
 if(CurrentRecord == 1){
 externalprevbtn.setEnabled(false);
 if(CurrentRecord > 0){
 --CurrentRecord;
 setFieldText(CurrentRecord);
 System.out.println(CurrentRecord);//Checking RECORD_NUM
 buttonpanel.add(externalprevbtn);
 addrecordbtn = new JButton("Add Record", createAddButtonIcon());
 addrecordbtn.addActionListener(new ActionListener(){
 public void actionPerformed(ActionEvent evt){
 try{
 MaxRecord = readRecordNumber();
 MaxRecord++;
 writeRecordNumber(MaxRecord);
 //--<BEGINNING>--Clear Fields-------------------------------------------------------//
 CustIDTxt.setText("");
 CustOrderIDTxt.setText(""+MaxRecord);
 //Get today's date
 Date todaydate = new Date();
 OrderedDateTxt.setText(""+simpleDF.format(todaydate));
 ItemNumberTxt.setText("");
 UnitPriceTxt.setText("");
 QuantityReqTxt.setText("");
 TotPriceTxt.setText("");
 GrandTotTxt.setText("");
 //--<END>--Clear Fields-------------------------------------------------------------//
 externalnextbtn.setEnabled(false);
 externalprevbtn.setEnabled(true);
 System.out.println(MaxRecord);
 } catch(Exception ec){ec.printStackTrace();}
 buttonpanel.add(addrecordbtn);
 savebtn = new JButton("Save Data", createSaveButtonIcon());
 savebtn.addActionListener(new ActionListener(){
 public void actionPerformed(ActionEvent evt){
 setFieldText(CurrentRecord);
 writeOrder();
 writeRecordNumber(MaxRecord);
 System.out.println(CurrentRecord);
 System.out.println(MaxRecord);
 buttonpanel.add(savebtn);
 java.net.URL imageURL_AddRowIcon = CommonFeatures.class.getResource("Icons/edit_add.png");
 ImageIcon AddRowIcon = new ImageIcon(imageURL_AddRowIcon);
 additemreqbtn = new JButton("Add Item", AddRowIcon);
 additemreqbtn.addActionListener(new ActionListener(){
 public void actionPerformed(ActionEvent evt){
 try{
 //--<BEGINNING>--Clear Fields-------------------------------------------------------//
 ItemNumberTxt.setText("");
 UnitPriceTxt.setText("");
 QuantityReqTxt.setText("");
 TotPriceTxt.setText("");
 //--<END>--Clear Fields-------------------------------------------------------------//
 //CurrentRecord = MaxRecord;
 currentItem++;
 setInnerFieldText(currentItem);
 internalnextbtn.setEnabled(false);
 internalprevbtn.setEnabled(true);
 System.out.println(MaxRecord);
 } catch(Exception ec){ec.printStackTrace();}
 buttonpanel.add(additemreqbtn);
 externalnextbtn = new JButton(createNextButtonIcon());
 externalnextbtn.addActionListener(new ActionListener(){
 public void actionPerformed(ActionEvent evt){
 getFieldText(CurrentRecord);
 externalprevbtn.setEnabled(true);
 if(CurrentRecord < MaxRecord){
 ++CurrentRecord;
 setFieldText(CurrentRecord);
 System.out.println(CurrentRecord);//Checking RECORD_NUM
 if(CurrentRecord == MaxRecord){
 externalnextbtn.setEnabled(false);
 buttonpanel.add(externalnextbtn);
 return buttonpanel;
 //TODO
 public void setFieldText(int orderID){//TODO
 orderDetails[orderID].setCustID(Integer.parseInt(CustIDTxt.getText()));
 orderDetails[orderID].setCustOrderID(Integer.parseInt(CustOrderIDTxt.getText()));
 orderDetails[orderID].setOrderDate(OrderedDateTxt.getText());
 orderDetails[orderID].setInnerCustOrdObj(innerCustOrdObj);
 orderDetails[orderID].setMaxItems(MaxItems);
 setInnerFieldText(currentItem);
 orderDetails[orderID].setGrandTotal(Float.parseFloat(GrandTotTxt.getText()));
 public void setInnerFieldText(int currentItem){//TODO
 innerCustOrdObj[currentItem] = new InnerCustOrdObject();
 innerCustOrdObj[currentItem].setItemNumber(Integer.parseInt(ItemNumberTxt.getText()));
 innerCustOrdObj[currentItem].setUnitPrice(Float.parseFloat(UnitPriceTxt.getText()));
 innerCustOrdObj[currentItem].setQuantityRequired(Integer.parseInt(QuantityReqTxt.getText()));
 innerCustOrdObj[currentItem].setTotalPrice(Float.parseFloat(TotPriceTxt.getText()));
 public void getFieldText(int orderID){
 CustIDTxt.setText(Integer.toString(orderDetails[orderID].getCustID()));
 CustOrderIDTxt.setText(Integer.toString(orderDetails[orderID].getCustOrderID()));
 OrderedDateTxt.setText(""+orderDetails[orderID].getOrderDate());
 currentItem = orderDetails[orderID].getMaxItems();
 System.err.println("currentItem" + currentItem);
 getInnerFieldText(currentItem);
 GrandTotTxt.setText(Float.toString(orderDetails[orderID].getGrandTotal()));
 public void getInnerFieldText(int currentItem){
 ItemNumberTxt.setText(Integer.toString(innerCustOrdObj[currentItem].getItemNumber()));
 UnitPriceTxt.setText(Float.toString(innerCustOrdObj[currentItem].getUnitPrice()));
 QuantityReqTxt.setText(Integer.toString(innerCustOrdObj[currentItem].getQuantityRequired()));
 TotPriceTxt.setText(Float.toString(innerCustOrdObj[currentItem].getTotalPrice()));
 public void writeOrder(){//TODO
 try {
 objOut = new ObjectOutputStream(new FileOutputStream(OrderDetailsFile));
 objOut.writeObject(orderDetails);
 System.out.println("WORKING!");
 objOut.flush();
 objOut.close();
 } catch (IOException e) {
 e.printStackTrace();
 public Object readOrder(){
 Object temporaryObj;
 try{
 objIn = new ObjectInputStream(new FileInputStream(OrderDetailsFile));
 temporaryObj = objIn.readObject();
 CustOrdObject[] blah = (CustOrdObject[]) temporaryObj;
 System.out.println("Outer: "+blah[1].getCustID());
 InnerCustOrdObject[] whee = blah[1].getInnerCustOrdObj();
 System.out.println("Inner: "+whee[1].getItemNumber());
 objIn.close();
 System.out.println("Read Worky!");
 return temporaryObj;
 }catch(Exception e){
 e.printStackTrace();
 System.out.println("Read No Worky!");
 return null;
 public void writeRecordNumber(int MaxRecord){
 try{
 objOut = new ObjectOutputStream(new FileOutputStream(OrdRecordNumStore));
 objOut.writeObject(MaxRecord);
 System.out.println("WORKING!");
 objOut.flush();
 objOut.close();
 }catch(Exception e){e.printStackTrace();}
 public int readRecordNumber() {
 try {
 objIn = new ObjectInputStream(new FileInputStream(OrdRecordNumStore));
 int temporaryObj = Integer.parseInt(objIn.readObject().toString());
 objIn.close();
 System.out.println("Read Number Worky!");
 return temporaryObj;
 } catch (Exception e) {
 e.printStackTrace();
 System.out.println("Read Number No Worky!");
 return -1;
}Message was edited by:
Kilik07
Message was edited by:
Kilik07

ok i got reading to work to a certain extent... but the prob is i cnt seem to save my innerCustOrdObj proprly...when ever i look for a record using the gotorecordbtn, the outerobject, which is the orderDetails, seems to change but the innerCustOrdObj remains the same... heres the new code..
public class CustomerOrderDetails extends CommonFeatures{
 //TODO
 private static int MAX_ORDERS = 200;
 private static int MAX_ORDERITEMS = 100;
 private static int MaxRecord;
 private static int CurrentRecord = 1;
 private static int currentItem;
 private static int MaxItems = 1;
 private static boolean FileExists, recFileExists;
 private static boolean RecordExists;
 private static CustOrdObject[] orderDetails = new CustOrdObject[MAX_ORDERS];
 private static InnerCustOrdObject[] innerCustOrdObj = new InnerCustOrdObject[MAX_ORDERITEMS];
 private static File OrderDetailsFile = new File("CustOrdDetails.ser");
 private static File OrdRecordNumStore = new File("OrdRecordNumStore.txt");
 private static PrintWriter writeFile;
 private static BufferedReader readFile;
 private static ObjectOutputStream objOut;
 private static ObjectInputStream objIn;
 //Set format for date
 SimpleDateFormat simpleDF = new SimpleDateFormat("dd MM yyyy");
 //--<BEGINNING>--Declaring Interface Variables------------------------------------------//
 private JPanel innertoppanel, innercenterpanel, innerbottompanel, innerrightpanel, innerleftpanel;
 private JLabel CustIDLbl, CustOrderIDLbl, OrderedDateLbl, GrandTotLbl, ItemNumberLbl,UnitPriceLbl, QuantityReqLbl, TotPriceLbl;
 private JTextField CustIDTxt, CustOrderIDTxt, OrderedDateTxt, GrandTotTxt, ItemNumberTxt, UnitPriceTxt, QuantityReqTxt, TotPriceTxt;
 private JButton addrecordbtn, savebtn, externalprevbtn, externalnextbtn, internalprevbtn, internalnextbtn, gotorecordbtn, additemreqbtn;
 //--<END>--Declaring Interface Variables------------------------------------------------//
 public static void main(String[] args) {
 final CustomerOrderDetails COD = new CustomerOrderDetails();
 java.awt.EventQueue.invokeLater(new Runnable() {
 public void run() {
 try {
 UIManager.setLookAndFeel("com.sun.java.swing.plaf.windows.WindowsLookAndFeel");
 COD.createCustOrdDetailsScreen();
 } catch (Exception eb) {
 eb.printStackTrace();
 //--<BEGINNING>--Creating CustomerOrderDetails Screen---------------------------------------//
 public JFrame createCustOrdDetailsScreen() {
 createDefaultFrame();
 mainframe.setSize(800,500);
 createContainerPanel();
 containerpanel.add(createCustOrdDetailsTitle(), BorderLayout.NORTH);
 containerpanel.add(createCustOrdDetailsMainPanel(), BorderLayout.CENTER);
 //containerpanel.add(createCustOrdDetailsLeftNavButtons(), BorderLayout.WEST);
 //containerpanel.add(createCustOrdDetailsRightNavButtons(), BorderLayout.EAST);
 containerpanel.add(createCustOrdDetailsButtons(), BorderLayout.SOUTH);
 mainframe.setContentPane(containerpanel);
 mainframe.setLocationRelativeTo(null);
 mainframe.setVisible(true);
 //--<BEGINNING>--Checks to see whether CRecordNumberStore file exists-------------------------------//
 if (OrdRecordNumStore.exists() == true) {
 recFileExists = true;
 }else {
 recFileExists = false;
 if (recFileExists == true) {
 MaxRecord = readRecordNumber();
 CurrentRecord = MaxRecord;
 //readOrder();
 //readInnerOrderRecord(CurrentRecord);
 System.out.println("Current Record " +CurrentRecord);
 System.out.println("Max Record " +MaxRecord);
 }else{
 MaxRecord = 1;
 writeRecordNumber(MaxRecord);
 CustOrderIDTxt.setText(""+MaxRecord);
 System.out.println("Current Record " +CurrentRecord);
 System.out.println("Max Record " +MaxRecord);
 //--<END>--Checks to see whether CRecordNumberStore file exists--------------------------------------//
 if(readOrder() != null){
 orderDetails = (CustOrdObject[]) readOrder();
 //CurrentRecord--;
 //System.out.println("Current Rec Here"+CurrentRecord);
 if(orderDetails[CurrentRecord] == null){
 System.err.println("CustomerOrderObj 1 is null !!");
 }else{
 System.err.println("CustomerOrderObj 1 is not null !!");
 if(orderDetails[CurrentRecord].getInnerCustOrdObj() == null){
 System.err.println("InnerCustomerOrderObj is null !!");
 }else{
 System.err.println("InnerCustomerOrderObj is not null !!");
 innerCustOrdObj = orderDetails[CurrentRecord].getInnerCustOrdObj();
 MaxItems = orderDetails[CurrentRecord].getMaxItems();
 if(CurrentRecord > 1 && CurrentRecord < MaxRecord){
 externalnextbtn.setEnabled(true);
 externalprevbtn.setEnabled(true);
 if(CurrentRecord >= MaxRecord){
 externalnextbtn.setEnabled(false);
 getFieldText(CurrentRecord);
 getInnerFieldText(MaxItems);
 }else{
 orderDetails[CurrentRecord] = new CustOrdObject();
 currentItem = 1;
 return mainframe;
 //--<END>--Creating CustomerOrderDetails Screen---------------------------------------------//
 public JPanel createCustOrdDetailsTitle(){
 createTitlePanel();
 titlepanel.setBackground(TxtfontColor);
 label.setText("- Customer Order Details -");
 labelpanel.setBackground(TxtfontColor);
 label.setForeground(Color.white);
 createbuttonpanel();
 buttonpanel.setBackground(TxtfontColor) ;
 buttonpanel.add(createReturnToMainMenuButton());
 titlepanel.add(labelpanel, BorderLayout.WEST);
 titlepanel.add(buttonpanel, BorderLayout.EAST);
 return titlepanel;
 public JPanel createCustOrdDetailsMainPanel(){
 createmainpanel();
 mainpanel.setBackground(TxtfontColor);
 mainpanel.setLayout(new BorderLayout());
 mainpanel.setBorder(BorderFactory.createTitledBorder(""));
 mainpanel.add(createInnerTopPanel(), BorderLayout.NORTH);
 mainpanel.add(createInnerCenterPanel(), BorderLayout.CENTER);
 mainpanel.add(createInnerBottomPanel(), BorderLayout.SOUTH);
 mainpanel.add(createInnerRightPanel(), BorderLayout.EAST);
 mainpanel.add(createInnerLeftPanel(), BorderLayout.WEST);
 return mainpanel;
 public JPanel createInnerTopPanel(){
 innertoppanel = new JPanel(new GridBagLayout());
 innertoppanel.setBackground(TxtfontColor);
 GridBagConstraints GBC = new GridBagConstraints();
 GBC.fill = GridBagConstraints.HORIZONTAL;
 //Setting Font Type and Size
 Font font = new Font("Arial", Font.BOLD, 11);
 CustIDLbl = new JLabel("Customer ID");
 CustIDLbl.setBorder(BorderFactory.createEmptyBorder(10,10,10,10));
 CustIDLbl.setFont(font);
 CustIDLbl.setForeground(LblfontColor);
 GBC.gridx = 1;
 GBC.gridy = 1;
 innertoppanel.add(CustIDLbl, GBC);
 CustIDTxt = new JTextField(20);
 CustIDTxt.setEditable(true);
 GBC.gridx = 2;
 GBC.gridy = 1;
 innertoppanel.add(CustIDTxt, GBC);
 GBC.gridx = 3;
 GBC.gridy = 1;
 innertoppanel.add(Box.createHorizontalStrut(220), GBC);
 OrderedDateLbl = new JLabel("Order Date");
 OrderedDateLbl.setBorder(BorderFactory.createEmptyBorder(10,10,10,10));
 OrderedDateLbl.setFont(font);
 OrderedDateLbl.setForeground(LblfontColor);
 GBC.gridx = 4;
 GBC.gridy = 1;
 innertoppanel.add(OrderedDateLbl, GBC);
 //Get today's date
 Date todaydate = new Date();
 OrderedDateTxt = new JTextField(simpleDF.format(todaydate), 20);
 OrderedDateTxt.setHorizontalAlignment(JTextField.CENTER);
 OrderedDateTxt.setEditable(false);
 GBC.gridx = 5;
 GBC.gridy = 1;
 innertoppanel.add(OrderedDateTxt, GBC);
 CustOrderIDLbl = new JLabel("Customer Order ID");
 CustOrderIDLbl.setBorder(BorderFactory.createEmptyBorder(10,10,10,10));
 CustOrderIDLbl.setFont(font);
 CustOrderIDLbl.setForeground(LblfontColor);
 GBC.gridx = 1;
 GBC.gridy = 2;
 innertoppanel.add(CustOrderIDLbl, GBC);
 CustOrderIDTxt = new JTextField(20);
 //CustOrderIDTxt.setEditable(false);
 GBC.gridx = 2;
 GBC.gridy = 2;
 innertoppanel.add(CustOrderIDTxt, GBC);
 return innertoppanel;
 public JPanel createInnerCenterPanel(){
 innercenterpanel = new JPanel(new GridBagLayout());
 innercenterpanel.setBackground(TxtfontColor);
 innercenterpanel.setBorder(BorderFactory.createLoweredBevelBorder());
 GridBagConstraints GBC = new GridBagConstraints();
 GBC.fill = GridBagConstraints.HORIZONTAL;
 //Setting Font Type and Size
 Font font = new Font("Arial", Font.BOLD, 11);
 ItemNumberLbl = new JLabel("Item Number");
 ItemNumberLbl.setBorder(BorderFactory.createEmptyBorder(10,10,10,10));
 ItemNumberLbl.setFont(font);
 ItemNumberLbl.setForeground(LblfontColor);
 GBC.gridx = 1;
 GBC.gridy = 1;
 innercenterpanel.add(ItemNumberLbl, GBC);
 ItemNumberTxt = new JTextField(20);
 GBC.gridx = 2;
 GBC.gridy = 1;
 innercenterpanel.add(ItemNumberTxt, GBC);
 UnitPriceLbl = new JLabel("Unit Price");
 UnitPriceLbl.setBorder(BorderFactory.createEmptyBorder(10,10,10,10));
 UnitPriceLbl.setFont(font);
 UnitPriceLbl.setForeground(LblfontColor);
 GBC.gridx = 1;
 GBC.gridy = 2;
 innercenterpanel.add(UnitPriceLbl, GBC);
 UnitPriceTxt = new JTextField(20);
 //UnitPriceTxt.setEditable(false);
 GBC.gridx = 2;
 GBC.gridy = 2;
 innercenterpanel.add(UnitPriceTxt, GBC);
 QuantityReqLbl = new JLabel("Quantity Required");
 QuantityReqLbl.setBorder(BorderFactory.createEmptyBorder(10,10,10,10));
 QuantityReqLbl.setFont(font);
 QuantityReqLbl.setForeground(LblfontColor);
 GBC.gridx = 1;
 GBC.gridy = 3;
 innercenterpanel.add(QuantityReqLbl, GBC);
 QuantityReqTxt = new JTextField(20);
 //QuantityReqTxt.setEditable(false);
 GBC.gridx = 2;
 GBC.gridy = 3;
 innercenterpanel.add(QuantityReqTxt, GBC);
 TotPriceLbl = new JLabel("Total Price");
 TotPriceLbl.setBorder(BorderFactory.createEmptyBorder(10,10,10,10));
 TotPriceLbl.setFont(font);
 TotPriceLbl.setForeground(LblfontColor);
 GBC.gridx = 1;
 GBC.gridy = 4;
 innercenterpanel.add(TotPriceLbl, GBC);
 TotPriceTxt = new JTextField(20);
 TotPriceTxt.setEditable(false);
 TotPriceTxt.addFocusListener(new FocusAdapter(){
 public void focusGained(FocusEvent evt){
 TotPriceTxt.setText(""+Integer.parseInt(UnitPriceTxt.getText())*Integer.parseInt(QuantityReqTxt.getText()));
 GBC.gridx = 2;
 GBC.gridy = 4;
 innercenterpanel.add(TotPriceTxt, GBC);
 return innercenterpanel;
 public JPanel createInnerBottomPanel(){
 innerbottompanel = new JPanel(new FlowLayout(FlowLayout.RIGHT));
 innerbottompanel.setBackground(TxtfontColor);
 //Setting Font Type and Size
 Font font = new Font("Arial", Font.BOLD, 11);
 GrandTotLbl = new JLabel("Grand Total");
 GrandTotLbl.setBorder(BorderFactory.createEmptyBorder(10,10,10,10));
 GrandTotLbl.setFont(font);
 GrandTotLbl.setForeground(LblfontColor);
 innerbottompanel.add(GrandTotLbl);
 innerbottompanel.add(Box.createHorizontalStrut(30));
 GrandTotTxt = new JTextField(20);
 innerbottompanel.add(GrandTotTxt);
 return innerbottompanel;
 public JPanel createInnerRightPanel(){
 innerrightpanel = new JPanel(new FlowLayout(FlowLayout.CENTER));
 innerrightpanel.setBackground(TxtfontColor);
 innerrightpanel.setLayout(new BoxLayout(navrightpanel, BoxLayout.Y_AXIS));
 innerrightpanel.setBorder(BorderFactory.createLoweredBevelBorder());
 innerrightpanel.setLayout(new GridBagLayout());
 GridBagConstraints GBC = new GridBagConstraints();
 GBC.fill = GridBagConstraints.HORIZONTAL;
 internalnextbtn = new JButton(createNextButtonIcon());
 GBC.gridx = 1;
 GBC.gridy = 1;
 internalnextbtn.addActionListener(new ActionListener(){
 public void actionPerformed(ActionEvent evt){
 getInnerFieldText(currentItem);
 internalprevbtn.setEnabled(true);
 if(currentItem < MaxItems){
 ++currentItem;
 orderDetails[CurrentRecord].getInnerCustOrdObj();
 setInnerFieldText(currentItem);
 System.out.println("Current Item" + currentItem);
 if(currentItem == MaxItems){
 internalnextbtn.setEnabled(false);
 innerrightpanel.add(internalnextbtn, GBC);
 return innerrightpanel;
 public JPanel createInnerLeftPanel(){
 innerleftpanel = new JPanel(new FlowLayout(FlowLayout.CENTER));
 innerleftpanel.setBackground(TxtfontColor);
 innerleftpanel.setBorder(BorderFactory.createLoweredBevelBorder());
 innerleftpanel.setForeground(Color.BLACK);
 innerleftpanel.setLayout(new GridBagLayout());
 GridBagConstraints GBC = new GridBagConstraints();
 GBC.fill = GridBagConstraints.HORIZONTAL;
 internalprevbtn = new JButton(createPreviousButtonIcon());
 GBC.gridx = 1;
 GBC.gridy = 1;
 internalprevbtn.addActionListener(new ActionListener(){
 public void actionPerformed(ActionEvent evt){
 getInnerFieldText(currentItem);
 internalnextbtn.setEnabled(true);
 if(currentItem == 1){
 internalprevbtn.setEnabled(false);
 if(currentItem > 0){
 --currentItem;
 orderDetails[CurrentRecord].getInnerCustOrdObj();
 setInnerFieldText(currentItem);
 System.out.println("Current Item" + currentItem);
 innerleftpanel.add(internalprevbtn, GBC);
 return innerleftpanel;
 public JPanel createCustOrdDetailsButtons(){
 createbuttonpanel();
 buttonpanel.setBackground(TxtfontColor);
 externalprevbtn = new JButton(createPreviousButtonIcon());
 externalprevbtn.addActionListener(new ActionListener(){
 public void actionPerformed(ActionEvent evt){
 getFieldText(CurrentRecord);
 externalnextbtn.setEnabled(true);
 if(CurrentRecord == 1){
 externalprevbtn.setEnabled(false);
 if(CurrentRecord > 0){
 --CurrentRecord;
 setFieldText(CurrentRecord);
 System.out.println("Current Record " + CurrentRecord);//Checking RECORD_NUM
 buttonpanel.add(externalprevbtn);
 addrecordbtn = new JButton("Add Record", createAddButtonIcon());
 addrecordbtn.addActionListener(new ActionListener(){
 public void actionPerformed(ActionEvent evt){
 try{
 MaxRecord = readRecordNumber();
 MaxRecord++;
 CurrentRecord = MaxRecord;
 orderDetails[CurrentRecord] = new CustOrdObject();
 writeRecordNumber(MaxRecord);
 MaxItems = 1;
 innerCustOrdObj[MaxItems] = new InnerCustOrdObject();
 //--<BEGINNING>--Clear Fields-------------------------------------------------------//
 CustIDTxt.setText("");
 CustOrderIDTxt.setText(""+MaxRecord);
 //Get today's date
 Date todaydate = new Date();
 OrderedDateTxt.setText(""+simpleDF.format(todaydate));
 ItemNumberTxt.setText("");
 UnitPriceTxt.setText("");
 QuantityReqTxt.setText("");
 TotPriceTxt.setText("");
 GrandTotTxt.setText("");
 //--<END>--Clear Fields-------------------------------------------------------------//
 externalnextbtn.setEnabled(false);
 externalprevbtn.setEnabled(true);
 System.out.println(MaxRecord);
 } catch(Exception ec){ec.printStackTrace();}
 buttonpanel.add(addrecordbtn);
 savebtn = new JButton("Save Data", createSaveButtonIcon());
 savebtn.addActionListener(new ActionListener(){
 public void actionPerformed(ActionEvent evt){
 setFieldText(CurrentRecord);
 setInnerFieldText(MaxItems);
 writeOrder();
 writeRecordNumber(MaxRecord);
 System.out.println(CurrentRecord);
 System.out.println(MaxRecord);
 buttonpanel.add(savebtn);
 java.net.URL imageURL_AddRowIcon = CommonFeatures.class.getResource("Icons/edit_add.png");
 ImageIcon AddRowIcon = new ImageIcon(imageURL_AddRowIcon);
 additemreqbtn = new JButton("Add Item", AddRowIcon);
 additemreqbtn.addActionListener(new ActionListener(){
 public void actionPerformed(ActionEvent evt){
 try{
 //--<BEGINNING>--Clear Fields-------------------------------------------------------//
 ItemNumberTxt.setText("");
 UnitPriceTxt.setText("");
 QuantityReqTxt.setText("");
 TotPriceTxt.setText("");
 //--<END>--Clear Fields-------------------------------------------------------------//
 //CurrentRecord = MaxRecord;
 MaxItems++;
 innerCustOrdObj[MaxItems] = new InnerCustOrdObject();
 System.out.println("Max Items "+MaxItems);
 currentItem = MaxItems;
 orderDetails[CurrentRecord].setMaxItems(MaxItems);
 ///setInnerFieldText(currentItem);
 internalnextbtn.setEnabled(false);
 internalprevbtn.setEnabled(true);
 } catch(Exception ec){ec.printStackTrace();}
 buttonpanel.add(additemreqbtn);
 externalnextbtn = new JButton(createNextButtonIcon());
 externalnextbtn.addActionListener(new ActionListener(){
 public void actionPerformed(ActionEvent evt){
 getFieldText(CurrentRecord);
 externalprevbtn.setEnabled(true);
 if(CurrentRecord < MaxRecord){
 ++CurrentRecord;
 setFieldText(CurrentRecord);
 System.out.println(CurrentRecord);//Checking RECORD_NUM
 if(CurrentRecord == MaxRecord){
 externalnextbtn.setEnabled(false);
 buttonpanel.add(externalnextbtn);
 gotorecordbtn = new JButton("Go To Record", createGotoButtonIcon());
 gotorecordbtn.addActionListener(new ActionListener() {
 public void actionPerformed(ActionEvent evt){
 * The text from the GotorecordTxt textfield will be taken and assigned
 * to a temporary integer variable called Find.
 int Find = Integer.parseInt(CustOrderIDTxt.getText());
 for(int j=1; j <= MaxRecord; j++){
 * Using a for loop, each record can be read using the readCustRecord
 * method.
 getFieldText(j);
 * An if condition is utilized to check whether the temporary stored variable, Find,
 * matches a field in a record. If this record is found, then using the RecordExists
 * which was declared at the top, either a true or false statement can be assigned
 * If the record exists, then a true statement will be assigned, if not a false
 * statement will be assigned.
 if(orderDetails[j].getCustOrderID() == Find){
 RecordExists = true;
 break;
 }else{
 RecordExists = false;
 if(RecordExists == false){
 * If the RecordExists is assigned a false statement, then a message will be
 * displayed to show that the record does not exist.
 JOptionPane.showMessageDialog(null, "Record Does Not Exist!", "Error Message", JOptionPane.ERROR_MESSAGE, createErrorIcon());
 }else{
 getFieldText(Find);
 buttonpanel.add(gotorecordbtn);
 return buttonpanel;
 //TODO
 public void setFieldText(int orderID){//TODO
 orderDetails[orderID].setCustID(Integer.parseInt(CustIDTxt.getText()));
 orderDetails[orderID].setCustOrderID(Integer.parseInt(CustOrderIDTxt.getText()));
 orderDetails[orderID].setOrderDate(OrderedDateTxt.getText());
 orderDetails[orderID].setInnerCustOrdObj(innerCustOrdObj);
 orderDetails[orderID].setMaxItems(MaxItems);
 setInnerFieldText(currentItem);
 orderDetails[orderID].setGrandTotal(Float.parseFloat(GrandTotTxt.getText()));
 public void setInnerFieldText(int currentItem){//TODO
 innerCustOrdObj[currentItem] = new InnerCustOrdObject();
 innerCustOrdObj[currentItem].setMaxItems(MaxItems);
 innerCustOrdObj[currentItem].setItemNumber(Integer.parseInt(ItemNumberTxt.getText()));
 innerCustOrdObj[currentItem].setUnitPrice(Float.parseFloat(UnitPriceTxt.getText()));
 innerCustOrdObj[currentItem].setQuantityRequired(Integer.parseInt(QuantityReqTxt.getText()));
 innerCustOrdObj[currentItem].setTotalPrice(Float.parseFloat(TotPriceTxt.getText()));
 public void getFieldText(int orderID){
 CustIDTxt.setText(Integer.toString(orderDetails[orderID].getCustID()));
 CustOrderIDTxt.setText(Integer.toString(orderDetails[orderID].getCustOrderID()));
 OrderedDateTxt.setText(""+orderDetails[orderID].getOrderDate());
 currentItem = orderDetails[orderID].getMaxItems();
 orderDetails[orderID].getInnerCustOrdObj();
 System.err.println("currentItem" + currentItem);
 //getInnerFieldText(currentItem);
 GrandTotTxt.setText(Float.toString(orderDetails[orderID].getGrandTotal()));
 public void getInnerFieldText(int currentItem){
 ItemNumberTxt.setText(Integer.toString(innerCustOrdObj[currentItem].getItemNumber()));
 UnitPriceTxt.setText(Float.toString(innerCustOrdObj[currentItem].getUnitPrice()));
 QuantityReqTxt.setText(Integer.toString(innerCustOrdObj[currentItem].getQuantityRequired()));
 TotPriceTxt.setText(Float.toString(innerCustOrdObj[currentItem].getTotalPrice()));
 public void writeOrder(){//TODO
 try {
 objOut = new ObjectOutputStream(new FileOutputStream(OrderDetailsFile));
 objOut.writeObject(orderDetails);
 System.out.println("WORKING!");
 objOut.flush();
 objOut.close();
 } catch (IOException e) {
 e.printStackTrace();
 public Object readOrder(){
 Object temporaryObj;
 try{
 objIn = new ObjectInputStream(new FileInputStream(OrderDetailsFile));
 temporaryObj = objIn.readObject();
 CustOrdObject[] blah = (CustOrdObject[]) temporaryObj;
 /* System.out.println("Outer: "+blah[1].getCustID());
 InnerCustOrdObject[] whee = blah[1].getInnerCustOrdObj();
 System.out.println("Inner: "+whee[1].getItemNumber());*/
 objIn.close();
 System.out.println("Read Worky!");
 return temporaryObj;
 }catch(Exception e){
 e.printStackTrace();
 System.out.println("Read No Worky!");
 return null;
 public void writeRecordNumber(int MaxRecord){
 try{
 objOut = new ObjectOutputStream(new FileOutputStream(OrdRecordNumStore));
 objOut.writeObject(MaxRecord);
 System.out.println("WORKING!");
 objOut.flush();
 objOut.close();
 }catch(Exception e){e.printStackTrace();}
 public int readRecordNumber() {
 try {
 objIn = new ObjectInputStream(new FileInputStream(OrdRecordNumStore));
 int temporaryObj = Integer.parseInt(objIn.readObject().toString());
 objIn.close();
 System.out.println("Read Number Worky!");
 return temporaryObj;
 } catch (Exception e) {
 e.printStackTrace();
 System.out.println("Read Number No Worky!");
 return -1;
}Message was edited by:
Kilik07

$200 reward to solve problem with JDBC and CLOB.getCharacterOutputStream

I'm trying to update CLOB with the getCharacterOutputStream as suggested in the example code. It works with US7ASCII DB instance but not instances in UTF8.
I've been browsing through all the Oracle doc's and found some rather confusing statements:
In the page at http://oradoc.photo.net/ora816/java.816/a81354/oralob2.htm#1043220
it says: [When writing to or reading from a CLOB, the JDBC drivers perform all character set conversions for you.]
also: [The oracle.sql.CLOB class supports all the character sets that the Oracle data server supports for CLOB types.]
So far so good.
In the page at http://oradoc.photo.net/ora816/java.816/a81354/oraint3.htm#1012518
it says [The oracle.sql package supports these datatypes in several ways: CLOBs point to large fixed-width character data items (that is, characters that require a fixed number of bytes per character) and are supported by the oracle.sql.CLOB class.]
Ooh no! Is this for real? UTF8 is variable width and does this mean it is not supported?
Any way to get around this?
In the page at http://oradoc.photo.net/ora816/java.816/a81358/03_pub2.htm#36009
says [6.The mappings to oracle.sql classes are optimal because they preserve data formats and require no character-set conversions (apart from the usual network conversions). Those classes are especially useful in applications that "shovel" data between SQL and Java.]
"No character set conversion"? Very confusing!
I've been hammering on this CLOB/JDBC/UTF8 problem for more than a week now and I really appreciate some solutions, workarounds, or whatever help I can get. I'm running java stored procedure in 8.1.6 on Linux RH6.2.
For your trouble, I'd pay $200 for the first guy who come up with a verifiable solution.

This is just findings based upon your comments:
Please refer to document Oracle8i National Language Support Guide
Release 2 (8.1.6) from Oracle Documentation Library, Release 8.1.7
Chapter 6 Java,
There its clearly mention that:
"Oracle JDBC drivers provide globalization support by allowing users to retrieve data from or insert data into a database in any character set that Oracle supports. Because Java strings are UCS2 encoded (16-bit Unicode) for JDBC programs, the target character set on the client is always UCS2. Character set conversion is required to convert data from the database character set (Db Charset) to UCS2. This applies to CHAR, LONG, CLOB, and VARCHAR2 data types; RAW data is not converted. "
Also..please refer this...
"oracle.sql.CLOB's method getCharacterStream() returns the contents of a CLOB as a Unicode stream."
"The techniques that Oracle's drivers use to perform character set conversion for Java applications depend on the character set the database uses. The simplest case is where the database uses a US7ASCII or WE8ISO8859P1 character set. In this case, the driver converts the data directly from the database character set to UCS2,which is used in Java applications. "
"If you are working with databases that employ a non-US7ASCII or non-WE8ISO8859P1 character set (for example, Japanese or Korean), then the driver converts the data, first to UTF8, then to UCS2. "
In my case the characte-set of the database is WE8ISO8859P1 and for security reason i can't change the character set but my feeling is that if you are updating the CLob from the java client you are forming a reference of a clob in the client which is UCS2 at the Java side. Now when you are populating the clob through java.io.Writer and call the procedure to pass the reference of the clob to the procedure then I believe the JDBC will convert the UCS2 datatype of Clob to UTF8 in the database.
You can try out the code snippet:
package ServletGDC;
import java.io.*;
import java.util.*;
import javax.servlet.*;
import javax.servlet.http.*;
import oracle.sql.*;
import java.sql.*;
import oracle.jdbc.driver.*;
import ClassesGDC.*;
public class testUpload extends HttpServlet {
private String m_strMessage="";//It stores the message to be uploaded along with the Document
Connection conn=null;
public void doPost(HttpServletRequest req, HttpServletResponse res)
throws ServletException, IOException {
String strContent="";
//res.setContentType("application/msword");
res.setContentType("text/html");
PrintWriter out = res.getWriter();
try {
CallableStatement cmt=null;
OutputStream output=null;
ByteArrayOutputStream byteoutput=null;
String strDocString="";
oracle.sql.CLOB tempClob = null;
String strPassedFileName=""; // the file name passed in the request object
String strStdFilename="";//the file name to be given to the best practice
String strSaveDirectory=""; //the directory in which the bp is to be saved
String strParamName="";//name of parameters
String strParamValue="";//value of parameters
int intTempVariable=0; // temporaty variable
long lngSizeOfFileUploaded=0;//stores the size of the file which had been uploaded in the file system
File filePathOfFileUploaded=null;//stores the path of the file uploaded to the file system
String strQuery="";
//ST------------checks if the user has logged in or not-----------------------
HttpSession session=req.getSession(true);
if(req.getContentLength()>20*1024*1024)
throw new skip("The size of the posted content is more than 10 MB . If you have a best practice whose size is more than 1 MB please mail it to Us.");
byteoutput = new ByteArrayOutputStream();
MultipartParser mp = new MultipartParser(req, 20*1024*1024); // 10MB is the limit of the file to be uploaded
Part part;//Its an abstact part which helps in retrieving information about the file and the parameters
while ((part = mp.readNextPart()) != null) {//Reads the next part
strParamName = part.getName();
// the following if is executed if the part is for a parameter rather than a file
if (part.isParam()) {
}else if (part.isFile()) {
// it's a file part
m_strMessage="inside file part";
FilePart filePart = (FilePart) part;
strPassedFileName = filePart.getFileName();
strContent= filePart.getContentType();
out.println(" strPassedFileName is "+strPassedFileName+"");
if(strPassedFileName != null || !(strPassedFileName.trim().equals("")) ) {
// the part actually contained a file
out.println(" before forming long");
//lngSizeOfFileUploaded = filePart.writeTo(filePathOfFileUploaded); //the statement upload the bestpractice in the
lngSizeOfFileUploaded = filePart.writeTo(byteoutput); //specified file path filePathOfFileUploaded.
out.println(" after file is written into the outputstream");
else {
throw new skip("The file name is null or it is empty space. Files in such Format are not accepted");
}//end of else if
}//end of while loop
if( lngSizeOfFileUploaded==0) {// the size of the file uploaded is zero then the file supplied was not proper and hence exception is to be thrown
//if(filePathOfFileUploaded.exists())
// filePathOfFileUploaded.delete();
throw new skip("The File could not be uploaded,Possible reasons may be that the file is sent null or the file is corrupted");
//END---------------the file is uploaded in the proper directory--------------------
//res.setContentType(strContent);
out.println(" long value is : "+lngSizeOfFileUploaded+" and content is "+strContent+"");
String strbyte= byteoutput.toString();
byteoutput.flush();
Class.forName("oracle.jdbc.driver.OracleDriver");
// Establish network connection to database
conn = DriverManager.getConnection("jdbc:oracle:thin:@pc-p32670:1521:GDCDBI","gdc_user","myuser");
//if(conn!=null)
out.println(" Connection formed"+conn);
//els
//out.println(" long value is : "+strbyte+"");
try{
tempClob = oracle.sql.CLOB.createTemporary(conn,true, oracle.sql.CLOB.DURATION_SESSION);
out.println(" tempClob : "+tempClob);
tempClob.open( oracle.sql.CLOB.MODE_READWRITE);
java.io.Writer tempClobWriter = tempClob.getCharacterOutputStream();
// writing the string formed from the multipart file to the clob
tempClobWriter.write(strbyte);
if(tempClob!=null){}
out.println(" CLOB value is : "+tempClob+"");
strQuery="{call INSERT_CLOB(?,?)}";
cmt=conn.prepareCall(strQuery);
cmt.setString(1,strPassedFileName);
cmt.setClob(2,tempClob);
cmt.registerOutParameter(2,java.sql.Types.CLOB);
cmt.execute();
tempClobWriter.flush();
tempClobWriter.close();
tempClob.freeTemporary();
//res.setContentType(strContent);
//strDocString.toString();
out.println(" bob is "+strbyte+"");
tempClob.close();
}catch(Exception e){
tempClob.close();
out.println(" Error is :"+e.getMessage()+"");
//e.printStackTrace(out);
cmt.close();
//out.println(" <h2>SUCCESS</h2>");
//res.sendRedirect("../test/showfile.jsp?contentype="+strContent.trim()+"");
}catch(Exception e){
java.util.Date d = new java.util.Date();
String s =d.toString();
out.println(" Error is :"+e.getMessage()+"");
//e.printStackTrace(out);
}finally{
try{
if(conn!=null)
conn.close();
}catch(Exception e){
out.println(" Error is :"+e.getMessage()+"");
}// end of finally
} //end of doPost
} //end of class
in the Procedure you will be inserting/updating the clob in a table with the reference clob in the out parameter of the procedure
Thanks.

Problem with socket connection

have my gps reciver connected to the usb port - i have a daemon gpsd running which makes data available on tcp port 2947 for querying. when i do telnet, it gives proper data.
but when i open a socket connection using java, it does not print anything as output. actually telnet asks for an escape charatcer so i am sending "r" initially to the server but still the program does not print anything as output.
here is my java code -
import java.io.*;
import java.net.Socket;
public class test2
public static void main(String[] args)
try
Socket s = new Socket("localhost",2947);
PrintWriter out = new PrintWriter(new BufferedWriter(new OutputStreamWriter(
s.getOutputStream())),true);
out.println("r");
BufferedReader in = new BufferedReader(new InputStreamReader(s.getInputStream()));
String line;
while(true)
line = in.readLine();
System.out.println(line);
catch (Exception e)
or sometimes it even shows error as
Exception in thread "main" java.net.SocketException: Invalid argument or cannot assign requested address
at java.net.PlainSocketImpl.socketConnect(Native Method)
and this is the output which i get on telnet -
ot@localhost ~]# telnet localhost 2947
Trying 127.0.0.1...
Connected to localhost.
Escape character is '^]'.
r
GPSD,R=1
$GPRMC,000212,V,18000.0000,N,00000.0000,W,0.0000,180.000,101102,,*1A
$GPGSA,A,1,,,,,,,,,,,,,,,,*32
$PGRME,400.00,0.00,0.00*7B
$GPRMC,000213,V,18000.0000,N,00000.0000,W,0.0000,180.000,101102,,*1B
$GPGSA,A,1,,,,,,,,,,,,,,,,*32
$PGRME,400.00,0.00,0.00*7B
$GPRMC,000214,V,18000.0000,N,00000.0000,W,0.0000,180.000,101102,,*1C
$GPGSA,A,1,,,,,,,,,,,,,,,,*32

Actually the problem does not seem to be in the code because i tried some basic client server programs (without any gpsd etc in picture) and even they are not working in linux though they work perfectly in windows (on the same machine). In linux it shows exception
My socket programs dont work in linux it shows error -
ot@localhost winc]# java parser
Exception in thread "main" java.net.SocketException: Invalid argument or cannot assign requested address
at java.net.PlainSocketImpl.socketConnect(Native Method)
at java.net.PlainSocketImpl.doConnect(PlainSocketImpl.java:305)
at java.net.PlainSocketImpl.connectToAddress(PlainSocketImpl.java:171)
at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:158)
at java.net.Socket.connect(Socket.java:452)
at java.net.Socket.connect(Socket.java:402)
at java.net.Socket.<init>(Socket.java:309)
at java.net.Socket.<init>(Socket.java:124)
at parser.main(parser.java:10)
i have removed the firewall settings etc and it still doesnot work in linux
what could be the cause for this?
Sowmya

Problem with socket programming(Vista)

I'm not sure if this has something to do with windows vista.
I wrote simple echo client and server programs and the client program contains these lines
String hostname="172.16.54.22"; //My comp's IP
int portNo=6666;
mySocket=new Socket(hostname, portNo);
Now the problem is that the client program is able to communicate with the server only when I run both of them in xp machines or if I run the server in vista and client in xp. The client is not able to connect to the server when both the client and server are running in a vista machine or if the server is running in xp and client in vista.
It'd be nice if any of you could throw some light on this issue.
PS:
It doesn't work even if I turn the firewall off
The programs work well when I give hostname="localhost" or hostname="127.0.0.1"
Here are my programs
//EchoClient.java
import java.io.*;
import java.net.*;
import java.util.*;
class EchoClient
     public static void main(String args[])
          String hostname="172.16.54.25"; //My ip address
          int portNo=6666;
          //if(args[1]
          //PrintWriter out=null;
          Socket mySocket=null;
          BufferedReader networkIn=null;
          BufferedReader userIn=null;
          PrintWriter sockOut=null;
          try
               mySocket=new Socket(hostname, portNo);
               networkIn=new BufferedReader(new InputStreamReader(mySocket.getInputStream()));
               userIn=new BufferedReader(new InputStreamReader(System.in));
               sockOut= new PrintWriter(mySocket.getOutputStream());
               System.out.println("Connected to Echo Server\n");
               System.out.println("Enter a series of lines (\"end\" to exit)\n");
               while(true)
                    String myLine=userIn.readLine();
               //     System.out.println(myLine);
                    if(myLine.equals("end"))
                         break;
                    sockOut.println(myLine);
                    sockOut.flush();
                    System.out.println(networkIn.readLine());
          catch(IOException exc)
               System.err.println(exc);
          finally
               try{
               if(networkIn!=null) networkIn.close();
               if(sockOut!=null) sockOut.close();}
               catch(IOException exc){ }
               EchoServer.java
//EchoServer.java
import java.io.*;
import java.net.*;
class EchoServer
     public static void main(String args[])
          int portNo=6666;
          ServerSocket serverSock=null;
          try
               serverSock=new ServerSocket(portNo);
               System.out.println("Echo Server Started\n\n");
               while(true)
                    Socket clientSock=serverSock.accept();
                    new Thread(new EchoServerThread(clientSock)).start();
          catch(IOException exc)
               System.err.println(exc);
     EchoServerThread.java
//EchoServerThread.java
import java.io.*;
import java.net.*;
import java.util.*;
public class EchoServerThread implements Runnable
     public Socket clientSock;
     EchoServerThread(Socket sock)
          clientSock=sock;
     public void run()
          System.out.println("\nAccepted Connection from a Client");
          try{
          BufferedReader in=new BufferedReader(new InputStreamReader(clientSock.getInputStream()));
          BufferedReader userIn=new BufferedReader(new InputStreamReader(System.in));
          PrintWriter out= new PrintWriter(clientSock.getOutputStream());
                    /*In sockIn=new In(clientSock);
          Out sockOut=new Out(clientSock);*/
          String str;
          while((str=in.readLine())!=null)
               out.println(str);
               out.flush();
          System.out.println("Closing Connection from a Client");
          out.close();
          in.close();
          catch(IOException exc)
               System.err.println(exc);


Sorry everyone but I'd been giving a wong IP address thinking it's my own. The problem's solved.
Thanks for the response Peter.

PrintWriter Problem

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