JScrollpane + JTextArea

hi to all,
i have 3 classes communicating (among others) to create a gui and pass info to the textarea in my scrollpane, its the first time ive used scrollpanes but according to the tutorial - it seems to be wired up right, however i cant get any text to display. the text area appears inside the scroller ok but i cant update it.
<code> => tester.java
InfoScroller info;
this.getContentPane().add(info.getInfoScroller(), new XYConstraints(18, 55, 150, 153));
</code>
<code> => parser.java -- parses a graph file
tester test = new tester();
test.info.setInfoText(" line: " + i + " .. " + expression);
</code>
<code> => InfoScroller.java --> holds the scrollpane and the textarea
infoText = new JTextArea();
// text area inside the scroller
infoText.setWrapStyleWord(true);
infoText.setLineWrap(true);
infoText.setText("");
infoText.setEditable(false);
infoText.setDisabledTextColor(Color.black);
infoText.setToolTipText("Graph Information");
infoText.setDoubleBuffered(false);
// create the scroller for the text area
infoScroller = new JScrollPane(infoText);
infoScroller.setBorder(BorderFactory.createEtchedBorder());
infoScroller.setViewportBorder(BorderFactory.createEtchedBorder());
infoScroller.setVerticalScrollBarPolicy(JScrollPane.
VERTICAL_SCROLLBAR_ALWAYS);
infoScroller.setHorizontalScrollBarPolicy(JScrollPane.
HORIZONTAL_SCROLLBAR_NEVER);
infoScroller.setWheelScrollingEnabled(true);
public JScrollPane getInfoScroller() {
return this.infoScroller;
public void setInfoText(String text) {
this.infoText.append(text);
</code>
regards,
g00fy

After appending the text, try:
textArea.setCaretPosition( 0 );

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return false;
 // Save current file; handle not yet having a filename; report to statusBar.
 boolean saveFile2() {
 // Handle the case where we don't have a file name yet.
 if (currFileName2 == null) {
 return saveAsFile2();
 try {
 // Open a file of the current name.
 File file = new File (currFileName2);
 // Create an output writer that will write to that file.
 // FileWriter handles international characters encoding conversions.
 FileWriter out = new FileWriter(file);
 String text = jTextArea3.getText();
 out.write(text);
 out.close();
 jButton7.setEnabled(false);
 return true;
catch (IOException e) {
 jTextArea4.append('\n'+"Error saving "+ currFileName2);
return false;
 // Save current file, asking user for new destination name.
// Report to statusBar.
 boolean saveAsFile() {
 // Use the SAVE version of the dialog, test return for Approve/Cancel
 if (JFileChooser.APPROVE_OPTION == jFileChooser1.showSaveDialog(this)) {
 // Set the current file name to the user's selection,
 // then do a regular saveFile
 currFileName = jFileChooser1.getSelectedFile().getPath();
 //repaints menu after item is selected
 this.repaint();
 return saveFile();
 else {
 this.repaint();
 return false;
 // Save current file, asking user for new destination name.
// Report to statusBar.
 boolean saveAsFile2() {
 // Use the SAVE version of the dialog, test return for Approve/Cancel
 if (JFileChooser.APPROVE_OPTION == jFileChooser2.showSaveDialog(this)) {
 // Set the current file name to the user's selection,
 // then do a regular saveFile
 currFileName2 = jFileChooser2.getSelectedFile().getPath();
 //repaints menu after item is selected
 this.repaint();
 return saveFile();
 else {
 this.repaint();
 return false;
 public void jButton1_actionPerformed(ActionEvent e) {
 saveFile();
 // Display the name of the saved directory+file in the statusBar.
 jTextArea4.append('\n'+"Saved to " + currFileName);
 public void jButton7_actionPerformed(ActionEvent e) {
 try{
 getAppletContext().showDocument(new URL("http://www.csc.liv.ac.uk/~cprdb/Live/v3.3/database.html"), "_blank" );
 catch (MalformedURLException ex)
 ex.printStackTrace();
 jButton6.setEnabled(true);
 public void jButton6_actionPerformed(ActionEvent e) {
 saveFile2();
 // Display the name of the saved directory+file in the statusBar.
 jTextArea4.append('\n'+"Saved to " + currFileName2);
 public void jButton3_actionPerformed(ActionEvent e) {
 // Handle the File|New menu item.
 // Clears the text of the text area.
 jTextArea3.setText("");
 currFileName2 = null;
 jButton6.setEnabled(true);
 jButton7.setEnabled(false);
 public void jButton2_actionPerformed(ActionEvent e) {
 // Use the OPEN version of the dialog, test return for Approve/Cancel
 if (JFileChooser.APPROVE_OPTION == jFileChooser1.showOpenDialog(this)) {
 // Call openFile to attempt to load the text from file into TextArea
 openFile(jFileChooser1.getSelectedFile().getPath());
 this.repaint();
class NoteTagger_jButton3_actionAdapter implements ActionListener {
 private NoteTagger adaptee;
 NoteTagger_jButton3_actionAdapter(NoteTagger adaptee) {
 this.adaptee = adaptee;
 public void actionPerformed(ActionEvent e) {
 adaptee.jButton3_actionPerformed(e);
class NoteTagger_jButton6_actionAdapter implements ActionListener {
 private NoteTagger adaptee;
 NoteTagger_jButton6_actionAdapter(NoteTagger adaptee) {
 this.adaptee = adaptee;
 public void actionPerformed(ActionEvent e) {
 adaptee.jButton6_actionPerformed(e);
 class NoteTagger_jButton7_actionAdapter implements ActionListener {
 private NoteTagger adaptee;
 NoteTagger_jButton7_actionAdapter(NoteTagger adaptee) {
 this.adaptee = adaptee;
 public void actionPerformed(ActionEvent e) {
 adaptee.jButton7_actionPerformed(e);
class NoteTagger_jButton2_actionAdapter implements ActionListener {
 private NoteTagger adaptee;
 NoteTagger_jButton2_actionAdapter(NoteTagger adaptee) {
 this.adaptee = adaptee;
 public void actionPerformed(ActionEvent e) {
 adaptee.jButton2_actionPerformed(e);
class NoteTagger_jButton1_actionAdapter implements ActionListener {
 private NoteTagger adaptee;
 NoteTagger_jButton1_actionAdapter(NoteTagger adaptee) {
 this.adaptee = adaptee;
 public void actionPerformed(ActionEvent e) {
 adaptee.jButton1_actionPerformed(e);
class FileSelectorUtils {
 public static String getExtension( File file ) {
 return getExtension( file.getName() );
 private static String getExtension( String str ) {
 String ext = null;
 int i = str.lastIndexOf( '.' );
 if( i > 0 && i < str.length() - 1) {
 ext = str.substring( i + 1 ).toLowerCase();
 return ext;
 public static File ensureExtension( File file, String ext ) {
 if( getExtension( file ) == null ) {
 file = new File( file.getAbsolutePath() + "." + ext );
 return file;
 class FileFilter1 extends FileFilter {
 // Valid File Extension
 public final static String txt = "txt";
 public boolean accept( File f ) {
 // Display Directory
 if( f.isDirectory() ) { return true; }
 // Get File's Extension
 String extension = FileSelectorUtils.getExtension( f );
 // Accept Select File Extensions
 if( extension != null ) {
if( extension.equals( FileFilter1.txt ) ) { return true; } // Accept *.ann
 // Else Deny File
 return false;
 public String getDescription() {
 return "Text Doument (*.txt)";
 class FileFilter2 extends FileFilter {
 // Valid File Extension
 public final static String html = "html";
 public boolean accept( File f ) {
 // Display Directory
 if( f.isDirectory() ) { return true; }
 // Get File's Extension
 String extension = FileSelectorUtils.getExtension( f );
 // Accept Select File Extensions
 if( extension != null ) {
if( extension.equals( FileFilter2.html ) ) { return true; } // Accept *.ann
 // Else Deny File
 return false;
 public String getDescription() {
 return "HTML Document (*.html)";
 }Any ideas? I could do with help ASAP if anybody has any ideas... Thanks
Mike

The apps listed at java-tips.org are just some of those that happen to be written in Java. If you want an editor that does syntax highlighting and other programming-specific tasks, you have dozens more options. A few Windows editors that spring to mind are EditPad, Crimson Editor, Scite, UltraEdit and Notetab. Then there are the old Unix standys, Emacs and vi, which have Windows versions as well. I use EditPad Pro, which isn't free like many of the others, but is worth the money anyway, IMO.

Geting a SCROLL BAR to scroll

hi i have create this application using JBuilder6 and it has a JTextArea within a JPanel, but i cannot get the text to scroll.
Any comments welcomed.
d code:
package com.borland.samples.gary;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.border.*;
* Author: 
* Description: 
* Copyright: Copyright (c) 2003
* Company: 
* @author unascribed
* @version 1.0
public class Frame1 extends JFrame {
JPanel contentPane;
JButton jButton1 = new JButton();
FlowLayout flowLayout1 = new FlowLayout();
JButton jButton2 = new JButton();
JButton jButton3 = new JButton();
JButton jButton4 = new JButton();
JScrollPane jScrollPane1 = new JScrollPane();
JTextArea jTextArea2 = new JTextArea();
Border border1;
//Construct the frame
public Frame1() {
 enableEvents(AWTEvent.WINDOW_EVENT_MASK);
 try {
 jbInit();
 catch(Exception e) {
 e.printStackTrace();
//Component initialization
private void jbInit() throws Exception {
 //setIconImage(Toolkit.getDefaultToolkit().createImage(Frame1.class.getResource("[Your Icon]")));
 contentPane = (JPanel) this.getContentPane();
 border1 = BorderFactory.createEmptyBorder();
 jButton1.setText("jButton1");
 contentPane.setLayout(flowLayout1);
 this.setSize(new Dimension(400, 300));
 this.setTitle("Frame Title");
 jButton2.setText("jButton2");
 jButton3.setText("jButton3");
 jButton4.setText("jButton4");
 jTextArea2.setPreferredSize(new Dimension(250, 170));
 jTextArea2.setMargin(new Insets(3, 3, 3, 3));
 jTextArea2.setLineWrap(true);
 jTextArea2.setWrapStyleWord(true);
 jScrollPane1.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_ALWAYS);
 jScrollPane1.setViewportBorder(border1);
 jScrollPane1.setNextFocusableComponent(jTextArea2);
 jScrollPane1.addMouseListener(new java.awt.event.MouseAdapter() {
 public void mousePressed(MouseEvent e) {
 jScrollPane1_mousePressed(e);
 contentPane.add(jButton1, null);
 contentPane.add(jButton2, null);
 contentPane.add(jButton3, null);
 contentPane.add(jButton4, null);
 contentPane.add(jScrollPane1, null);
 jScrollPane1.getViewport().add(jTextArea2, null);
//Overridden so we can exit when window is closed
protected void processWindowEvent(WindowEvent e) {
 super.processWindowEvent(e);
 if (e.getID() == WindowEvent.WINDOW_CLOSING) {
 System.exit(0);
void jScrollPane1_mousePressed(MouseEvent e) {
 jTextArea2.append("mouussee pressed");
}cheers Brendan2003

Change jTextArea2.setPreferredSize() to jScrollPane1.setPreferredSize(). As it stands now, you are telling the text area that you don't want it to change size, if at all possible, so it doesn't.

Dropdown Menu bar being hidden by the Textarea

My problem is that the menu bar does show up, but the text area is over the dropdown menu. You can see the drop down menu start but then is hidden under the textarea. I hope that a good enough discription.
The frame is a typical JFrame that contains a BorderLayout. My class TheFrame is an extention of JFrame. In the CenterPanel I have a Text area. In the south panel I have another BorderLayout with a text area as the center and a button for the east panel. The menu is going under the text area in the center panel. This might be a bug with the borderlayout?
public TheFrame(){
super("Com");
getContentPane().setLayout(new BorderLayout());
JMenuBar menuBar = new JMenuBar();
setJMenuBar(menuBar);
menuBar.add(getMyMenuBar());
getContentPane().add(getCenterPanel(), BorderLayout.CENTER);
getContentPane().add(getSouthPanel(), BorderLayout.SOUTH);
pack();
private JMenu getMyMenuBar(){
JMenu menu = new JMenu("File");
menu.add(createConnectItem());
menu.add(new JMenuItem("test"));
return menu;
private JMenuItem createConnectItem(){
JMenuItem connect = new JMenuItem("New");
ActionListener listener = new ConnectMenuItemActionListener(com);
connect.addActionListener(listener);
return connect;
}

I don't see the textarea in the code you posted.
But I know that the described problem comes up when
you use "TextArea" unstead of "JTextArea".
"TextArea" is an awt component and "JTextArea" is
the corresponding swing component. You should not
mix awt and swing components in the same GUI.
However, "TextArea" has the scrolling facility already included.
With "JTextArea" you must use JScrollPane if you need
scrolling.
        JScrollPane scrollpane = new JScrollPane();
        JTextArea textarea = new JTextArea();
        scrollpane.setViewportView(textarea);

Networking system

Dear all,
I'm doing my homework and it is very closed to the deadline, pls. help!
The question is:
Develop a chat system which allows at most 5 clients to chat online. The client window should have the following entities:
? a text area (called text1) which allows the client to type in a message;
? a button (called submit button) which allows the client to submit the typed message;
? a text area (called text2) which is used to show all the messages typed by all the served clients;
? a button (called quit button) which allows the user to quite at any time;
? a label (called message label) which is used to show messages from the server.
The operation of the system is:
When a client start, it will try to connect to the server. When it is connected, a welcome message will be displayed on message label. Then, if there are less than 5 clients being served, the new client will be served immediately. Otherwise, it has to joint a queue waiting for a served client to quit. If a client has to wait, a message would be displayed on message label telling him/her to wait. If a client is ready to be served, a message will be displayed on message label telling him/her that it is being served.
When a client is connected to a server, it will be assigned a client number sequentially. This means that the first client will be client 1, the second will be client 2 etc.
Originally, both text1 and text2 are non-editable. When the client is served, text1 would become editable and allow user to type in anytime. When submit button is pressed, the message in text1 would be appended to all served clients' text2 including the one who sends the message. Then, text1 of the sender would be cleared. The following is an example of what is displayed in text2:
client 2: Hello!
client 1: Long time no see!
client 3: Have you done TMA3?
client 2: I have done it. It is very easy.
A user can disconnect from the server by pressing the quit button at anytime. The client window would disappear. Then, the first client waiting at the queue would be served.
I havd write some java programme and not completed:
package Q1;
import java.awt.*;
import javax.swing.*;
import java.net.*;
import java.io.*;
import java.awt.event.*;
public class ClientFrame extends JFrame implements Runnable{
GridLayout gridLayout1 = new GridLayout();
JPanel jPanel1 = new JPanel();
JPanel jPanel2 = new JPanel();
JPanel jPanel3 = new JPanel();
JScrollPane jScrollPane1 = new JScrollPane();
BorderLayout borderLayout1 = new BorderLayout();
DefaultComboBoxModel model=new DefaultComboBoxModel();
JList jList1 = new JList(model);
JPanel jPanel4 = new JPanel();
JLabel jLabel1 = new JLabel();
BorderLayout borderLayout2 = new BorderLayout();
JPanel jPanel5 = new JPanel();
BorderLayout borderLayout3 = new BorderLayout();
JPanel jPanel6 = new JPanel();
JScrollPane jScrollPane2 = new JScrollPane();
JScrollPane jScrollPane3 = new JScrollPane();
JTextArea jTextArea1 = new JTextArea();
JTextArea jTextArea2 = new JTextArea();
JLabel jLabel2 = new JLabel("Chat List");
JLabel jLabel4 = new JLabel("Chating");
JTextField jTextField1 = new JTextField();
JButton jButton1 = new JButton();
JPanel jPanel7 = new JPanel();
JButton jButton2 = new JButton();
DataInputStream in;
DataOutputStream out;
Reader reader;
Writer writer;
JLabel jLabel3 = new JLabel();
 GridLayout gridLayout2 = new GridLayout();
/** Creates a new instance of ClientFrame */
public ClientFrame() throws HeadlessException {
 try {
 jbInit();
 setSize(400,600);
 catch(Exception e) {
 e.printStackTrace();
public void start(){
 printMessage("Get ready");
 public void result(boolean result){
 try{
 out.writeInt(ClientThread.END);
 catch (Exception e){
 e.printStackTrace();
 public void printMessage(String message){
 jLabel1.setText(message);
 this.validate();
 repaint();
private void jbInit() throws Exception {
 gridLayout1.setColumns(1);
 gridLayout1.setRows(0);
 this.getContentPane().setLayout(gridLayout1);
 jPanel1.setLayout(borderLayout1);
 jPanel3.setLayout(borderLayout2);
 jPanel2.setLayout(borderLayout3);
 jButton1.setText("Quit");
 jButton1.addActionListener(new ClientFrame_jButton1_actionAdapter(this));
 jLabel1.setText("");
 jTextArea1.setEditable(false);
 jTextArea1.setText("");
 jTextArea2.setEditable(false);
 jTextArea2.setText("");
 jButton2.setEnabled(false);
 jButton2.setText("Submit");
 jButton2.addActionListener(new ClientFrame_jButton2_actionAdapter(this));
 jPanel4.setLayout(gridLayout2);
 gridLayout2.setColumns(1);
 gridLayout2.setRows(2);
 this.getContentPane().add(jPanel1, null);
 jPanel1.add(jScrollPane1, BorderLayout.CENTER);
 jPanel1.add(jPanel4, BorderLayout.NORTH);
 jPanel4.add(jLabel3, null);
 jPanel4.add(jLabel1, null);
 jScrollPane1.getViewport().add(jList1, null);
 this.getContentPane().add(jPanel3, null);
 jPanel3.add(jPanel5, BorderLayout.NORTH);
 jPanel5.add(jLabel2, null);
 jPanel3.add(jScrollPane3, BorderLayout.CENTER);
 jScrollPane3.getViewport().add(jTextArea1, null);
 this.getContentPane().add(jPanel2, null);
 jPanel2.add(jPanel6, BorderLayout.SOUTH);
 jPanel6.add(jButton2, null);
 jPanel6.add(jButton1, null);
 jPanel2.add(jScrollPane2, BorderLayout.CENTER);
 jPanel2.add(jPanel7, BorderLayout.NORTH);
 jPanel7.add(jLabel4, null);
 jScrollPane2.getViewport().add(jTextArea2, null);
 printMessage("Welcome to the chat, We are waiting for some more players");
private void addClient(int id) {
 String idString="Client "+id;
 model.addElement(idString);
private void removeClient(int id) {
 String idString="Client "+id;
 for (int i=0;i<model.getSize();i++) {
 String temp=(String)model.getElementAt(i);
 if (idString.equals(temp)) {
 model.removeElementAt(i);
 break;
public void run(){
 try{
 while (true){
 int mode = in.readInt();
 switch (mode) {
 case ClientThread.START:
 start();
 break;
 case ClientThread.END:
 boolean result = in.readBoolean();
 result(result);
 break;
 catch (Exception e){
 e.printStackTrace();
public static void main(String st[]) {
 try {
 ClientFrame client=new ClientFrame();
 client.addWindowListener(
 new java.awt.event.WindowAdapter() {
 public void windowClosing(java.awt.event.WindowEvent ee) {
 System.exit(0);
 client.setVisible(true);
 client.out.flush();
 int id=client.in.readInt();
 client.jLabel1.setText("You are client "+id);
 boolean cont=true;
 while (cont) {
 int command=client.in.readInt();
 switch (command) {
 case ClientThread.ADDCLIENT: int cid=client.in.readInt();
 client.addClient(cid);
 break;
 case ClientThread.REMOVECLIENT: cid=client.in.readInt();
 client.removeClient(cid);
 break;
 case ClientThread.START: cid=client.in.readInt();
 int result=JOptionPane.showConfirmDialog(null,"Client "+cid+" has invited you for a chating");
 client.out.writeInt(ClientThread.START);
 client.out.writeInt(cid);
 client.out.writeBoolean(result==JOptionPane.YES_OPTION);
 client.out.flush();
 if (result==JOptionPane.YES_OPTION) {
 cont=false;
 client.out.writeInt(ClientThread.END);
 Thread thread=new Thread(client);
 thread.start();
 client.jLabel3.setText("You are connected with client "+cid);
 break;
 char buffer[]=new char[1000];
 client.jButton1.setEnabled(false);
 client.model.removeAllElements();
 client.jTextArea2.setEditable(true);
 client.jButton2.setEnabled(true);
 while (true) {
 int no=client.reader.read(buffer);
 String text=new String(buffer,0,no);
 client.jTextArea1.append(text+"\n");
 catch (Exception e) {
 e.printStackTrace();
void jButton1_actionPerformed(ActionEvent e) {
 try {
 int cid=Integer.parseInt(this.jTextField1.getText());
 out.writeInt(ClientThread.END);
 out.writeInt(cid);
 out.flush();
 catch (Exception ee) {
 ee.printStackTrace();
void jButton2_actionPerformed(ActionEvent e) {
 try {
 String text = jTextArea2.getText();
 writer.write(text);
 writer.flush();
 jTextArea2.setText("");
 catch (Exception ee) {
 ee.printStackTrace();
class ClientFrame_jButton1_actionAdapter implements java.awt.event.ActionListener {
ClientFrame adaptee;
ClientFrame_jButton1_actionAdapter(ClientFrame adaptee) {
 this.adaptee = adaptee;
public void actionPerformed(ActionEvent e) {
 adaptee.jButton1_actionPerformed(e);
class ClientFrame_jButton2_actionAdapter implements java.awt.event.ActionListener {
ClientFrame adaptee;
ClientFrame_jButton2_actionAdapter(ClientFrame adaptee) {
 this.adaptee = adaptee;
public void actionPerformed(ActionEvent e) {
 adaptee.jButton2_actionPerformed(e);
package Q1;
import java.io.*;
import java.net.*;
import java.util.*;
public class ClientThread extends Thread{
 final public static int END = 1,
 START = 0,
 ADDCLIENT = 2,
 REMOVECLIENT = 3,
 ACCEPTED = 4;
 private Integer id;
 private static int noClients = 0;
 private Socket socket;
 private DataInputStream in;
 private DataOutputStream out;
 //private java.net.InetAddress address;
 //int port;
 Server server;
 /** Creates a new instance of Class */
 public ClientThread(Server _server, Socket _socket) {
 try{
 socket = _socket;
 in = new DataInputStream(socket.getInputStream());
 out = new DataOutputStream(socket.getOutputStream());
 server = _server;
 id = new Integer(++noClients);
 catch (Exception e){
 e.printStackTrace();
 server.putClient(this);
 public Integer getId(){
 return id;
 synchronized public void addClient(Integer id){
 try{
 out.writeInt(ADDCLIENT);
 out.writeInt(id.intValue());
 out.flush();
 catch (Exception e){
 e.printStackTrace();
 synchronized public void removeClient(Integer id){
 try{
 out.writeInt(REMOVECLIENT);
 out.writeInt(id.intValue());
 out.flush();
 catch (Exception e){
 e.printStackTrace();
 public void begin(ClientThread from){
 try{
 out.writeInt(START);
 out.writeInt(from.getId().intValue());
 out.flush();
 catch (Exception e){
 e.printStackTrace();
 public void run(){
 try{
 while(true){
 int mode = in.readInt();
 switch(mode){
 case END:
 break;
 catch (Exception e){
 e.printStackTrace();
package Q1;
import java.util.*;
import java.net.*;
* @author Administrator
public class Server extends Thread{
 final static int MIN = 2, MAX = 5;
 Vector clients = new Vector();
 ClientThread[] players;
 Hashtable hashtableClients = new Hashtable();
 synchronized void putClient(ClientThread client){
 Iterator iter = hashtableClients.values().iterator();
 while (iter.hasNext()){
 ClientThread temp = (ClientThread) iter.next();
 temp.addClient(client.getId());
 client.addClient(temp.getId());
 hashtableClients.put(client.getId(), client);
 synchronized public void register(ClientThread thread){
 clients.addElement(thread);
 if(clients.size() >= MIN){
 notify();
 synchronized ClientThread getClient(int id){
 Integer idString = new Integer(id);
 return (ClientThread)hashtableClients.get(idString);
 synchronized public ClientThread[] getPlayers(){
 try {
 if(clients.size() < MIN){
 wait();
 int no = clients.size() < MAX ? clients.size() : MAX;
 ClientThread[] result = new ClientThread[no];
 for (int i = 0; i < no; i++){
 result[i] = getClient(no);
 return result;
 catch (Exception e){
 e.printStackTrace();
 return null;
 /** Creates a new instance of Server */
 public Server() {
 public void run(){
 try{
 while (true){
 players = getPlayers();
 for(int i = 0; i < players.length; i++){
 players.begin(players[i]);
catch (Exception e){
e.printStackTrace();
* @param args the command line arguments
public static void main(String[] st) {
try{
Server server = new Server();
server.start();
ServerSocket sSocket = new ServerSocket(11111);
while(true){
Socket socket = sSocket.accept();
ClientThread client = new ClientThread(server, socket);
client.start();
server.register(client);
catch (Exception e){
e.printStackTrace();

I had modify my programme and I still cannot connect the two client and chat. Pls help!!!
import java.awt.*;
import javax.swing.*;
import java.awt.event.*;
import java.io.*;
import java.net.*;
public class Client extends JFrame {
GridLayout gridLayout1 = new GridLayout();
JPanel jPanel1 = new JPanel();
JPanel jPanel2 = new JPanel();
JPanel jPanel3 = new JPanel();
JScrollPane jScrollPane1 = new JScrollPane();
BorderLayout borderLayout1 = new BorderLayout();
DefaultComboBoxModel model=new DefaultComboBoxModel();
JList jList1 = new JList(model);
JPanel jPanel4 = new JPanel();
JLabel jLabel1 = new JLabel();
BorderLayout borderLayout2 = new BorderLayout();
JPanel jPanel5 = new JPanel();
BorderLayout borderLayout3 = new BorderLayout();
JPanel jPanel6 = new JPanel();
JScrollPane jScrollPane2 = new JScrollPane();
JScrollPane jScrollPane3 = new JScrollPane();
JTextArea jTextArea1 = new JTextArea();
JTextArea jTextArea2 = new JTextArea();
JLabel jLabel2 = new JLabel("text2");
JLabel jLabel4 = new JLabel("text1");
JLabel jLabel5 = new JLabel("");
JTextField jTextField1 = new JTextField();
JButton jButton1 = new JButton();
JPanel jPanel7 = new JPanel();
JButton jButton2 = new JButton();
public Client() throws HeadlessException {
 try {
 jbInit();
 setSize(400,600);
 catch(Exception e) {
 e.printStackTrace();
 private void jbInit() throws Exception {
 gridLayout1.setColumns(1);
 gridLayout1.setRows(0);
 this.getContentPane().setLayout(gridLayout1);
 jPanel1.setLayout(borderLayout1);
 jPanel3.setLayout(borderLayout2);
 jPanel2.setLayout(borderLayout3);
 jButton1.setText("Quit");
 jButton1.addActionListener(new Client_jButton1_actionAdapter(this));
 jLabel1.setText("");
 jTextArea1.setEditable(false);
 jTextArea1.setText("");
 jTextArea2.setEditable(false);
 jTextArea2.setText("");
 jButton2.setEnabled(false);
 jButton2.setText("Submit");
 jButton2.addActionListener(new Client_jButton2_actionAdapter(this));
 jPanel4.setLayout(gridLayout2);
 gridLayout2.setColumns(1);
 gridLayout2.setRows(2);
 this.getContentPane().add(jPanel1, null);
 jPanel1.add(jScrollPane1, BorderLayout.CENTER);
 jPanel1.add(jPanel4, BorderLayout.NORTH);
 jPanel4.add(jLabel5, null);
 jPanel4.add(jLabel3, null);
 jPanel4.add(jLabel1, null);
 jScrollPane1.getViewport().add(jList1, null);
 this.getContentPane().add(jPanel3, null);
 jPanel3.add(jPanel5, BorderLayout.NORTH);
 jPanel5.add(jLabel2, null);
 jPanel3.add(jScrollPane3, BorderLayout.CENTER);
 jScrollPane3.getViewport().add(jTextArea1, null);
 this.getContentPane().add(jPanel2, null);
 jPanel2.add(jPanel6, BorderLayout.SOUTH);
 jPanel6.add(jButton2, null);
 jPanel6.add(jButton1, null);
 jPanel2.add(jScrollPane2, BorderLayout.CENTER);
 jPanel2.add(jPanel7, BorderLayout.NORTH);
 jPanel7.add(jLabel4, null);
 jScrollPane2.getViewport().add(jTextArea2, null);
 printMessage("Welcome to the chat");
public void printMessage(String message){
 jLabel5.setText(message);
 this.validate();
 repaint();
private void addClient(int id) {
 String idString="Client "+id;
 model.addElement(idString);
private void removeClient(int id) {
 String idString="Client "+id;
 for (int i=0;i<model.getSize();i++) {
 String temp=(String)model.getElementAt(i);
 if (idString.equals(temp)) {
 model.removeElementAt(i);
 break;
DataInputStream in;
DataOutputStream out;
Reader reader;
Writer writer;
JLabel jLabel3 = new JLabel();
 GridLayout gridLayout2 = new GridLayout();
public static void main(String st[]) {
 int noOfClient = 0;
 try {
 Client client=new Client();
 client.addWindowListener(
 new java.awt.event.WindowAdapter() {
 public void windowClosing(java.awt.event.WindowEvent ee) {
 System.exit(0);
 client.setVisible(true);
 Socket socket=new Socket("127.0.0.1",12345);
 int port=socket.getLocalPort();
 client.in=new DataInputStream(socket.getInputStream());
 client.out=new DataOutputStream(socket.getOutputStream());
 client.out.writeInt(port);
 client.out.flush();
 int id=client.in.readInt();
 client.jLabel1.setText("You are client "+id);
 boolean cont=true;
 while (cont) {
 int command=client.in.readInt();
 switch (command) {
 case ServerThread.ADDCLIENT: int cid=client.in.readInt();
 client.addClient(cid);
 break;
 case ServerThread.REMOVECLIENT: cid=client.in.readInt();
 client.removeClient(cid);
 break;
 case ServerThread.ACCEPTED:
 cid=client.in.readInt();
 boolean answer=client.in.readBoolean();
 if (answer) {
 cont = false;
 client.reader = new InputStreamReader(socket.getInputStream());
 client.writer = new OutputStreamWriter(socket.getOutputStream());
 client.jLabel3.setText("You are connected with client "+cid);
 else {
 JOptionPane.showMessageDialog(null,"Client "+cid+" has denied your invitation");
 break;
 case ServerThread.INVITE: cid=client.in.readInt();
 int result=JOptionPane.showConfirmDialog(null,"Client "+cid+" has invited you for a private conversation");
 client.out.writeInt(ServerThread.ACCEPTED);
 client.out.writeInt(cid);
 client.out.writeBoolean(result==JOptionPane.YES_OPTION);
 client.out.flush();
 if (result==JOptionPane.YES_OPTION) {
 cont=false;
 client.out.writeInt(ServerThread.QUIT);
 socket.close();
 ServerSocket sSocket=new ServerSocket(port);
 System.out.println("listen at port "+port);
 Socket sock=sSocket.accept();
 client.reader=new InputStreamReader(sock.getInputStream());
 client.writer=new OutputStreamWriter(sock.getOutputStream());
 client.jLabel3.setText("You are connected with client "+cid);
 break;
 char buffer[]=new char[1000];
 client.jButton1.setEnabled(false);
 client.model.removeAllElements();
 client.jTextArea2.setEditable(true);
 client.jButton2.setEnabled(true);
 while (true) {
 int no=client.reader.read(buffer);
 String text=new String(buffer,0,no);
 client.jTextArea1.append(text+"\n");
 catch (Exception e) {
 e.printStackTrace();
void jButton1_actionPerformed(ActionEvent e) {
 try {
 //int cid=Integer.parseInt(this.jTextField1.getText());
 out.writeInt(ServerThread.INVITE);
 //out.writeInt(cid);
 out.flush();
 catch (Exception ee) {
 ee.printStackTrace();
void jButton2_actionPerformed(ActionEvent e) {
 try {
 String text = jTextArea2.getText();
 writer.write(text);
 writer.flush();
 jTextArea2.setText("");
 catch (Exception ee) {
 ee.printStackTrace();
class Client_jButton1_actionAdapter implements java.awt.event.ActionListener {
Client adaptee;
Client_jButton1_actionAdapter(Client adaptee) {
 this.adaptee = adaptee;
public void actionPerformed(ActionEvent e) {
 adaptee.jButton1_actionPerformed(e);
class Client_jButton2_actionAdapter implements java.awt.event.ActionListener {
Client adaptee;
Client_jButton2_actionAdapter(Client adaptee) {
 this.adaptee = adaptee;
public void actionPerformed(ActionEvent e) {
 adaptee.jButton2_actionPerformed(e);
package online;
import java.util.*;
import java.io.*;
import java.net.*;
public class Server {
Hashtable clients = new Hashtable();
synchronized void putClient(ServerThread client) {
 Iterator iter = clients.values().iterator();
 while (iter.hasNext()) {
 ServerThread temp = (ServerThread) iter.next();
 temp.addClient(client.getId());
 client.addClient(temp.getId());
 clients.put(client.getId(), client);
synchronized void removeClient(ServerThread client) {
 clients.remove(client.getId());
 Iterator iter = clients.values().iterator();
 while (iter.hasNext()) {
 ServerThread temp = (ServerThread) iter.next();
 temp.removeClient(client.getId());
notifyAll();
synchronized ServerThread getClient(int id) {
 Integer idString=new Integer(id);
 return (ServerThread)clients.get(idString);
public Server() {
synchronized void invite(ServerThread from, int to) {
 ServerThread toThread=this.getClient(to);
 toThread.invite(from);
synchronized void accepted(ServerThread to, int from,boolean answer) {
 ServerThread fromThread=this.getClient(from);
 fromThread.accept(to,answer);
public static void main(String st[]) {
 Server server = new Server();
 try {
 ServerSocket sSocket = new ServerSocket(12345);
 while (true ) {
 Socket socket=sSocket.accept();
 DataInputStream in=new DataInputStream(socket.getInputStream());
 DataOutputStream out=new DataOutputStream(socket.getOutputStream());
 int port=in.readInt();
 (new ServerThread(server,socket.getInetAddress(),port,in,out)).start();
 catch (Exception e) {
 e.printStackTrace();
package online;
import java.io.*;
import java.net.*;
public class ServerThread
 extends Thread {
public static final int QUIT = 0,
 INVITE = 1,
 ADDCLIENT = 2,
 REMOVECLIENT = 3,
 ACCEPTED = 4;
private Integer id;
private static int noClients = 0;
private DataInputStream in;
private DataOutputStream out;
private java.net.InetAddress address;
int port;
Server server;
public ServerThread(Server server, java.net.InetAddress address, int port,
 DataInputStream in, DataOutputStream out) {
 this.address = address;
 this.in = in;
 this.out = out;
 this.port = port;
 id = new Integer(++noClients);
 this.server = server;
 try {
 out.writeInt(id.intValue());
 catch (Exception e) {
 e.printStackTrace();
 server.putClient(this);
public Integer getId() {
 return id;
synchronized public void addClient(Integer id) {
 try {
 out.writeInt(ADDCLIENT);
 out.writeInt(id.intValue());
 out.flush();
 catch (Exception e) {
 e.printStackTrace();
synchronized public void removeClient(Integer id) {
 try {
 out.writeInt(REMOVECLIENT);
 out.writeInt(id.intValue());
 out.flush();
 catch (Exception e) {
 e.printStackTrace();
synchronized public void invite(ServerThread from) {
 try {
 out.writeInt(INVITE);
 out.writeInt(from.getId().intValue());
 out.flush();
 catch (Exception e) {
 e.printStackTrace();
synchronized public void accept(ServerThread to, boolean answer) {
 try {
 out.writeInt(ACCEPTED);
 out.writeInt(to.id.intValue());
 out.writeBoolean(answer);
 if (answer) {
 String address = to.address.toString().split("/")[1];
 out.writeInt(address.length());
 out.writeChars(address);
 out.writeInt(to.port);
 out.flush();
 catch (Exception e) {
 e.printStackTrace();
public void run() {
 try {
 boolean cont = true;
 while (cont) {
 int command = in.readInt();
 switch (command) {
 case QUIT:
 cont = false;
 break;
 case INVITE:
 int inviteId = in.readInt();
 server.invite(this,inviteId);
 break;
 case ACCEPTED:
 int acceptId = in.readInt();
 boolean answer = in.readBoolean();
 server.accepted(this, acceptId, answer);
 break;
 catch (Exception e) {
 e.printStackTrace();
 finally {
 server.removeClient(this);
}

Making a seperate frame non resizable

Is it possible to make a seperate frame non-resizable and if so how? If I set the resizable property of the window then this simply makes the browser non-resizable rather than the seperate frame. Is there some PL/SQL code that can do this for me or is it possible to set this in the forms web config? Thanks for any help
Dan

I have tried this method, it looks like it should run, but when i compile it the browser displays................
"Untitled1.java": Error #: 750 : initialization error: com.borland.compiler.symtab.LoadError: neither class nor source found for java.lang.Object
public class Untitled1 extends Component {
public void createPanel()
JFrame frame = new JFrame();
frame.setUndecorated(true);
frame.setLayout(new BorderLayout());
MyDisplay test = new MyDisplay(frame);
test.setLayout(new BorderLayout());
frame.add(test, BorderLayout.CENTER);
JLabel label = new JLabel("This is just a test");
test.add(label, BorderLayout.CENTER);
frame.pack();
frame.setSize(500, 500);
// make sure you pack and/or set size first...
Dimension dS = Toolkit.getDefaultToolkit().getScreenSize();
Dimension dF = frame.getSize();
// make sure it's not off screen
int x = (dS.width/2)-(dF.width/2);
int y = (dS.height/2)-(dF.height/2);
if(x < 0) x = 0;
if(y < 0) y = 0;
frame.setLocation(x, y);
frame.setVisible(true);
contentpane.add(sc);
jscrollpane sc = new jscrollpane();
jtextarea ta = new jtextarea();
/**Main method*/
public static void main(String[] args) {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
catch(Exception e) {
e.printStackTrace();
new untitled1();
Do you know how i can correct this erreor!

Help -- vectors

i am writing an editor and i have run into a problem.
I am using vectors to keep track of the documents that
opened. the documents are displayed in a JTabbedPane
and i am using a JTextArea for editing them. When i
try to do go to Select All of i get a bunch of errors.
here is code that i am using to: add elements to the
Vector, trying to Select All. And the runtime error
that occurs when i try the select All on anything but
the first element in the Vector.
adding elements to the Vector:
vector = new Vector();
vector.addElement(new JTextArea());
((JTextArea)vector.lastElement()).setTabSize(2);
((JTextArea)vector.lastElement()).setText(text);
JScrollPane scrollPane = new
JScrollPane((JTextArea)vector.lastElement());trying to selectAll:
((JTextArea)vector.elementAt(tabbedPane.getSelect
dIndex())).selectAll();error:
Exception occurred during event dispatching:
java.lang.ArrayIndexOutOfBoundsException: 1 >= 1
at java.util.Vector.elementAt(Vector.java:417)
at
VisualChange$ItemHandler.actionPerformed(VisualChange.
ava:589)
at
javax.swing.AbstractButton.fireActionPerformed(Abstrac
Button.java:1450)
at
javax.swing.AbstractButton$ForwardActionEvents.actionP
rformed(AbstractButton.java:1504)
at
javax.swing.DefaultButtonModel.fireActionPerformed(Def
ultButtonModel.java:378)
at
javax.swing.DefaultButtonModel.setPressed(DefaultButto
Model.java:250)
at
javax.swing.AbstractButton.doClick(AbstractButton.java
279)
at
javax.swing.plaf.basic.BasicMenuItemUI$MouseInputHandl
r.mouseReleased(BasicMenuItemUI.java:886)
at
java.awt.AWTEventMulticaster.mouseReleased(AWTEventMul
icaster.java:230)
at
java.awt.Component.processMouseEvent(Component.java:37
7)
at
java.awt.Component.processEvent(Component.java:3546)
at
java.awt.Container.processEvent(Container.java:1164)
at
java.awt.Component.dispatchEventImpl(Component.java:25
5)
at
java.awt.Container.dispatchEventImpl(Container.java:12
3)
at
java.awt.Component.dispatchEvent(Component.java:2499)
at
java.awt.LightweightDispatcher.retargetMouseEvent(Cont
iner.java:2451)
at
java.awt.LightweightDispatcher.processMouseEvent(Conta
ner.java:2216)
at
java.awt.LightweightDispatcher.dispatchEvent(Container
java:2125)
at
java.awt.Container.dispatchEventImpl(Container.java:12
0)
at
java.awt.Window.dispatchEventImpl(Window.java:912)
at
java.awt.Component.dispatchEvent(Component.java:2499)
at
java.awt.EventQueue.dispatchEvent(EventQueue.java:319)
at
java.awt.EventDispatchThread.pumpOneEvent(EventDispatc
Thread.java:103)
at
java.awt.EventDispatchThread.pumpEvents(EventDispatchT
read.java:93)
at
java.awt.EventDispatchThread.run(EventDispatchThread.j
va:84)
sample code would help a lot. thanks in
advance: TravenE.

i hope this is as simple as i think it is.. is this the EXACT code youre using to add new elements: ???
vector = new Vector();
vector.addElement(new TextArea());
((JTextArea)vector.lastElement()).setTabSize(2);
((JTextArea)vector.lastElement()).setText(text);
JScrollPane scrollPane = new> JScrollPane((JTextArea)vector.lastElement());"""
cause, what i think is happening, is that youre just creating the new vector each time youre attempting to add elements to it..youre basically deleting the elements in the vector every time you add a new element, so the most elements you can have is one... try this: move the following line:
" vector = new Vector();"
move it somewhere else...like in the form constructor or somewhere where it will only execute ONCE.. because right now, you have the vector redefining itself every time a new element is being added.
anyway, hope it works... sorry if i misread your code. talk to ya later,
Steven Berardi

JScrollpane + JTextArea

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