Servlet chat app with ajax

Hi
First of all I don't have much experience on servlets.
This is what I'm trying to accomplish, a simple chat app on the website.
I know a little bit of java networking, so my idea was to write a server on the side and connect it with the servlet so I can manage incoming messages and broadcast them to other users.
What is the cleanest and best way to achieve this? Is my idea wrong?
Thanks in advance.

Chat apps don't really lean themselves towards http technology.
That is because HTTP is a request/response model. - a PULL , not a PUSH.
With messaging, when you receive a message from someone, you want to send it out to all the interested parties. Unfortunately you don't know who or where they are, so you have to wait until one of them comes to you and asks "are there any messages for me?"
You might want to check out pushlets as a way of using HTTP technology in a push manner, but for the most part I would say you are dealing with innapropriate technology. An applet/activex control would be more in line with this.
Just my 2 cents,
evnafets

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4.007369 @:0 type=4 (00000000/36)
[VCSIP_INVITEERROR]
[19]
4.007235 @SIP/SIP.c:2437 type=4 (900A0015/36)
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3.506761 @SIP/Transport.c:1218 type=1 (00000000/0)
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From: "acca68hc113" <sip:[email protected]>;tag=1660987668
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CSeq: 1 INVITE
Contact: <sip:[email protected]>;isfocus
User-Agent: Viceroy 1.2
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Content-Length: 504
v=0
o=tavis 0 0 IN IP4 192.168.0.100
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c=IN IP4 192.168.0.100
b=AS:2147483647
t=0 0
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a=rtcp:16385
a=rtpmap:126 X-H264
a=fmtp:34 imagesize 1 rules 30:352:288
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a=RTCP:AUDIO 16387 VIDEO 16385
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a=rtpID:-512752917
2.506287 @SIP/Transport.c:1218 type=1 (00000000/0)
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b=AS:2147483647
t=0 0
a=hwi:34:2:999
a=bandwidthDetection:YES
a=iChatEncryption:NO
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a=rtcp:16387
a=rtpmap:3 GSM/8000
a=rtpmap:0 PCMU/8000
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m=video 16384 RTP/AVP 126 34
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a=rtpmap:126 X-H264
a=fmtp:34 imagesize 1 rules 30:352:288
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To: "u0" <sip:[email protected]:1315>
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Contact: <sip:[email protected]>;isfocus
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b=AS:2147483647
t=0 0
a=hwi:34:2:999
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a=rtcp:16387
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a=rtpmap:0 PCMU/8000
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m=video 16384 RTP/AVP 126 34
a=rtcp:16385
a=rtpmap:126 X-H264
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a=RTCP:AUDIO 16387 VIDEO 16385
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Contact: <sip:[email protected]>;isfocus
User-Agent: Viceroy 1.2
Content-Type: application/sdp
Content-Length: 504
v=0
o=tavis 0 0 IN IP4 m.0
s=acca68hc113
c=IN IP4 m.0
b=AS:2147483647
t=0 0
a=hwi:34:2:999
a=bandwidthDetection:YES
a=iChatEncryption:NO
m=audio 16386 RTP/AVP 12 3 0
a=rtcp:16387
a=rtpmap:3 GSM/8000
a=rtpmap:0 PCMU/8000
a=rtpID:-1834565503
m=video 16384 RTP/AVP 126 34
a=rtcp:16385
a=rtpmap:126 X-H264
a=fmtp:34 imagesize 1 rules 30:352:288
a=framerate:15
a=RTCP:AUDIO 16387 VIDEO 16385
a=pogo
a=fmtp:126 imagesize 0 rules 15:160:120:160:120
a=rtpID:-512752917
0.000000 @:0 type=2 (00000000/36)
[VCVIDEO_OUTGOINGATTEMPT]
[4]
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0x90000000 - 0x901bbfff libSystem.B.dylib /usr/lib/libSystem.B.dylib
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0x90292000 - 0x90343fff com.apple.ApplicationServices.ATS 1.9.3 (???) /System/Library/Frameworks/ApplicationServices.framework/Versions/A/Frameworks/ ATS.framework/Versions/A/ATS
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0x90a39000 - 0x90abdfff libobjc.A.dylib /usr/lib/libobjc.A.dylib
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0x9143d000 - 0x914b8fff com.apple.audio.CoreAudio 3.0.4 /System/Library/Frameworks/CoreAudio.framework/Versions/A/CoreAudio
0x914f5000 - 0x914f5fff com.apple.ApplicationServices 10.4 (???) /System/Library/Frameworks/ApplicationServices.framework/Versions/A/Application Services
0x914f7000 - 0x9152ffff com.apple.AE 1.5 (297) /System/Library/Frameworks/ApplicationServices.framework/Versions/A/Frameworks/ AE.framework/Versions/A/AE
0x9154a000 - 0x91617fff com.apple.ColorSync 4.4.4 /System/Library/Frameworks/ApplicationServices.framework/Versions/A/Frameworks/ ColorSync.framework/Versions/A/ColorSync
0x9166c000 - 0x916fdfff com.apple.print.framework.PrintCore 4.6 (177.13) /System/Library/Frameworks/ApplicationServices.framework/Versions/A/Frameworks/ PrintCore.framework/Versions/A/PrintCore
0x91744000 - 0x917fbfff com.apple.QD 3.10.20 (???) /System/Library/Frameworks/ApplicationServices.framework/Versions/A/Frameworks/ QD.framework/Versions/A/QD
0x91838000 - 0x91896fff com.apple.HIServices 1.5.3 (???) /System/Library/Frameworks/ApplicationServices.framework/Versions/A/Frameworks/ HIServices.framework/Versions/A/HIServices
0x918c5000 - 0x918e9fff com.apple.LangAnalysis 1.6.1 /System/Library/Frameworks/ApplicationServices.framework/Versions/A/Frameworks/ LangAnalysis.framework/Versions/A/LangAnalysis
0x918fd000 - 0x91922fff com.apple.FindByContent 1.5 /System/Library/Frameworks/ApplicationServices.framework/Versions/A/Frameworks/ FindByContent.framework/Versions/A/FindByContent
0x91935000 - 0x91977fff com.apple.LaunchServices 181 /System/Library/Frameworks/ApplicationServices.framework/Versions/A/Frameworks/ LaunchServices.framework/Versions/A/LaunchServices
0x91993000 - 0x919a7fff com.apple.speech.synthesis.framework 3.3 /System/Library/Frameworks/ApplicationServices.framework/Versions/A/Frameworks/ SpeechSynthesis.framework/Versions/A/SpeechSynthesis
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0x91c7a000 - 0x91c93fff com.apple.ImageIO.framework 1.4.8 /System/Library/Frameworks/ApplicationServices.framework/Versions/A/Frameworks/ ImageIO.framework/Versions/A/Resources/libPng.dylib
0x91c98000 - 0x91c9bfff com.apple.ImageIO.framework 1.4.8 /System/Library/Frameworks/ApplicationServices.framework/Versions/A/Frameworks/ ImageIO.framework/Versions/A/Resources/libRadiance.dylib
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0x92855000 - 0x928ddfff com.apple.DesktopServices 1.3.4 /System/Library/PrivateFrameworks/DesktopServicesPriv.framework/Versions/A/Desk topServicesPriv
0x9291e000 - 0x92b49fff com.apple.Foundation 6.4.6 (567.27) /System/Library/Frameworks/Foundation.framework/Versions/C/Foundation
0x92c67000 - 0x92d45fff libxml2.2.dylib /usr/lib/libxml2.2.dylib
0x92d65000 - 0x92e53fff libiconv.2.dylib /usr/lib/libiconv.2.dylib
0x92e65000 - 0x92e83fff com.apple.opengl 1.4.7 /System/Library/Frameworks/OpenGL.framework/Versions/A/Libraries/libGL.dylib
0x92e8e000 - 0x92ee8fff com.apple.opengl 1.4.7 /System/Library/Frameworks/OpenGL.framework/Versions/A/Libraries/libGLU.dylib
0x92f06000 - 0x92f06fff com.apple.Carbon 10.4 (???) /System/Library/Frameworks/Carbon.framework/Versions/A/Carbon
0x92f08000 - 0x92f1cfff com.apple.ImageCapture 3.0 /System/Library/Frameworks/Carbon.framework/Versions/A/Frameworks/ImageCapture. framework/Versions/A/ImageCapture
0x92f34000 - 0x92f44fff com.apple.speech.recognition.framework 3.4 /System/Library/Frameworks/Carbon.framework/Versions/A/Frameworks/SpeechRecogni tion.framework/Versions/A/SpeechRecognition
0x92f50000 - 0x92f65fff com.apple.securityhi 2.0 (203) /System/Library/Frameworks/Carbon.framework/Versions/A/Frameworks/SecurityHI.fr amework/Versions/A/SecurityHI
0x92f77000 - 0x92ffefff com.apple.ink.framework 101.2 (69) /System/Library/Frameworks/Carbon.framework/Versions/A/Frameworks/Ink.framework /Versions/A/Ink
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0x93027000 - 0x93054fff com.apple.openscripting 1.2.5 (???) /System/Library/Frameworks/Carbon.framework/Versions/A/Frameworks/OpenScripting .framework/Versions/A/OpenScripting
0x9306e000 - 0x9307efff com.apple.print.framework.Print 5.0 (190.1) /System/Library/Frameworks/Carbon.framework/Versions/A/Frameworks/Print.framewo rk/Versions/A/Print
0x9308a000 - 0x930f0fff com.apple.htmlrendering 1.1.2 /System/Library/Frameworks/Carbon.framework/Versions/A/Frameworks/HTMLRendering .framework/Versions/A/HTMLRendering
0x93121000 - 0x93170fff com.apple.NavigationServices 3.4.4 (3.4.3) /System/Library/Frameworks/Carbon.framework/Versions/A/Frameworks/NavigationSer vices.framework/Versions/A/NavigationServices
0x9319e000 - 0x931bbfff com.apple.audio.SoundManager 3.9 /System/Library/Frameworks/Carbon.framework/Versions/A/Frameworks/CarbonSound.f ramework/Versions/A/CarbonSound
0x931cd000 - 0x931dafff com.apple.CommonPanels 1.2.2 (73) /System/Library/Frameworks/Carbon.framework/Versions/A/Frameworks/CommonPanels. framework/Versions/A/CommonPanels
0x931e3000 - 0x934f0fff com.apple.HIToolbox 1.4.8 (???) /System/Library/Frameworks/Carbon.framework/Versions/A/Frameworks/HIToolbox.fra mework/Versions/A/HIToolbox
0x9363f000 - 0x9364bfff com.apple.opengl 1.4.7 /System/Library/Frameworks/OpenGL.framework/Versions/A/OpenGL
0x93650000 - 0x93670fff com.apple.DirectoryService.Framework 3.1 /System/Library/Frameworks/DirectoryService.framework/Versions/A/DirectoryServi ce
0x936e4000 - 0x936e4fff com.apple.Cocoa 6.4 (???) /System/Library/Frameworks/Cocoa.framework/Versions/A/Cocoa
0x936e6000 - 0x93d19fff com.apple.AppKit 6.4.7 (824.41) /System/Library/Frameworks/AppKit.framework/Versions/C/AppKit
0x940a6000 - 0x94116fff com.apple.CoreData 80 /System/Library/Frameworks/CoreData.framework/Versions/A/CoreData
0x9414f000 - 0x94212fff com.apple.audio.toolbox.AudioToolbox 1.4.3 /System/Library/Frameworks/AudioToolbox.framework/Versions/A/AudioToolbox
0x94264000 - 0x94264fff com.apple.audio.units.AudioUnit 1.4 /System/Library/Frameworks/AudioUnit.framework/Versions/A/AudioUnit
0x94266000 - 0x94419fff com.apple.QuartzCore 1.4.8 /System/Library/Frameworks/QuartzCore.framework/Versions/A/QuartzCore
0x9446c000 - 0x944a9fff libsqlite3.0.dylib /usr/lib/libsqlite3.0.dylib
0x944b1000 - 0x94501fff com.apple.opengl 1.4.7 /System/Library/Frameworks/OpenGL.framework/Versions/A/Libraries/libGLImage.dyl ib
0x94541000 - 0x94585fff com.apple.bom 8.5 (86.3) /System/Library/PrivateFrameworks/Bom.framework/Versions/A/Bom
0x94591000 - 0x945d3fff com.apple.vmutils 4.0.2 (93.1) /System/Library/PrivateFrameworks/vmutils.framework/Versions/A/vmutils
0x94617000 - 0x94633fff com.apple.securityfoundation 2.2 (27710) /System/Library/Frameworks/SecurityFoundation.framework/Versions/A/SecurityFoun dation
0x94647000 - 0x9468bfff com.apple.securityinterface 2.2 (27692) /System/Library/Frameworks/SecurityInterface.framework/Versions/A/SecurityInter face
0x946af000 - 0x946befff com.apple.CoreGraphics 1.258.33 (???) /System/Library/Frameworks/ApplicationServices.framework/Versions/A/Frameworks/ CoreGraphics.framework/Versions/A/Resources/libCGATS.A.dylib
0x946c6000 - 0x946d2fff com.apple.CoreGraphics 1.258.33 (???) /System/Library/Frameworks/ApplicationServices.framework/Versions/A/Frameworks/ CoreGraphics.framework/Versions/A/Resources/libCSync.A.dylib
0x94718000 - 0x94730fff com.apple.CoreGraphics 1.258.33 (???) /System/Library/Frameworks/ApplicationServices.framework/Versions/A/Frameworks/ CoreGraphics.framework/Versions/A/Resources/libRIP.A.dylib
0x94737000 - 0x949ebfff com.apple.QuickTime 7.1.2 /System/Library/Frameworks/QuickTime.framework/Versions/A/QuickTime
0x94aaf000 - 0x94b20fff libstdc++.6.dylib /usr/lib/libstdc++.6.dylib
0x94b93000 - 0x94bb3fff libmx.A.dylib /usr/lib/libmx.A.dylib
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0x94ec8000 - 0x94ed8fff libsasl2.2.dylib /usr/lib/libsasl2.2.dylib
0x94edc000 - 0x94f0bfff libssl.0.9.7.dylib /usr/lib/libssl.0.9.7.dylib
0x94f1b000 - 0x94f38fff libresolv.9.dylib /usr/lib/libresolv.9.dylib
0x95287000 - 0x952f5fff com.apple.Bluetooth 1.7.5 (1.7.5f10) /System/Library/Frameworks/IOBluetooth.framework/Versions/A/IOBluetooth
0x95abf000 - 0x95b4dfff com.apple.WebKit 418.8 /System/Library/Frameworks/WebKit.framework/Versions/A/WebKit
0x95ba9000 - 0x95c3ffff com.apple.JavaScriptCore 418.3 /System/Library/Frameworks/WebKit.framework/Versions/A/Frameworks/JavaScriptCor e.framework/Versions/A/JavaScriptCore
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0x96111000 - 0x9613afff libxslt.1.dylib /usr/lib/libxslt.1.dylib
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0x97af1000 - 0x97b16fff com.apple.speech.LatentSemanticMappingFramework 2.2 /System/Library/PrivateFrameworks/LatentSemanticMapping.framework/Versions/A/La tentSemanticMapping
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Hi Zaxxon,
Welcome to the Apple Discussions
IF you are you using UPnP then you don't need to set other means of opening the ports.
The D-Link 624 does not like UPnP on see http://docs.info.apple.com/article.html?artnum=93333
5:18 PM Sunday; September 3, 2006
Message was edited by: Ralph Johns (UK)'s Spelling teacher

Video Chat App won't launch

Hello,
Recently, my video chat app has stopped working. It will not launch, instead displaying a dialogue box that says, "error-services-failed (30000)"
It does not seem to matter which wifi network I am connected to. I have reset the device with no improvement, as well as upgrading to the latest OS.
Any recommendations?
Thanks.

connect your playbook to desktop manager and update it if its updated then repair it

Tomcat crashes while running servlet chat in IE

Hi all!
I've seen similar problems posted about three years ago, but I didn't see an answer for it.
I'd be very grateful if you could help me.
I'm writing a chat, the code was taken from the J.Hunter "Servlet programming book" O'reilly, "absurdly simple chat", and adjusted (I only need the Http version). It's an applet-servlet chat.
When executed in IE, Tomcat crashes after a few (usually 5) sent messages. When executed in a debugger (I use Forte, the last available version, 4 update 1) the program works just fine...
Another question is about debugging an applet, executed in a browser - how do I do this?
Here is the code for the servlet:
=================================
import java.io.*;
import java.net.*;
import java.util.*;
import javax.servlet.*;
import javax.servlet.http.*;
public class TryChatServlet extends HttpServlet
// source acts as the distributor of new messages
MessageSource source = new MessageSource();
// doGet() returns the next message. It blocks until there is one.
public void doGet(HttpServletRequest req, HttpServletResponse res)
throws ServletException, IOException {
res.setContentType("text/plain");
PrintWriter out = res.getWriter();
// Return the next message (blocking)
out.println(getNextMessage());
// doPost() accepts a new message and broadcasts it to all
// the currently listening HTTP and socket clients.
public void doPost(HttpServletRequest req, HttpServletResponse res)
throws ServletException, IOException {
// Accept the new message as the "message" parameter
String message = req.getParameter("message");
// Broadcast it to all listening clients
if (message != null) broadcastMessage(message);
// Set the status code to indicate there will be no response
res.setStatus(res.SC_NO_CONTENT);
// getNextMessage() returns the next new message.
// It blocks until there is one.
public String getNextMessage() {
// Create a message sink to wait for a new message from the
// message source.
return new MessageSink().getNextMessage(source);
// broadcastMessage() informs all currently listening clients that there
// is a new message. Causes all calls to getNextMessage() to unblock.
public void broadcastMessage(String message) {
// Send the message to all the HTTP-connected clients by giving the
// message to the message source
source.sendMessage(message);
// MessageSource acts as the source for new messages.
// Clients interested in receiving new messages can
// observe this object.
class MessageSource extends Observable {
public void sendMessage(String message) {
setChanged();
notifyObservers(message);
// MessageSink acts as the receiver of new messages.
// It listens to the source.
class MessageSink implements Observer {
String message = null; // set by update() and read by getNextMessage()
// Called by the message source when it gets a new message
synchronized public void update(Observable o, Object arg) {
// Get the new message
message = (String)arg;
// Wake up our waiting thread
notify();
// Gets the next message sent out from the message source
synchronized public String getNextMessage(MessageSource source) {
// Tell source we want to be told about new messages
source.addObserver(this);
// Wait until our update() method receives a message
while (message == null) {
try { wait(); } catch (Exception ignored) { }
// Tell source to stop telling us about new messages
source.deleteObserver(this);
// Now return the message we received
// But first set the message instance variable to null
// so update() and getNextMessage() can be called again.
String messageCopy = message;
message = null;
return messageCopy;
=============================
The code for the applet is
=============================
import java.applet.*;
import java.awt.*;
import java.io.*;
import java.net.*;
import java.util.*;
public class TryChatApplet extends Applet implements Runnable {
TextArea text;
Label label;
TextField input;
Thread thread;
String user;
public void init() {
// Check if this applet was loaded directly from the filesystem.
// If so, explain to the user that this applet needs to be loaded
// from a server in order to communicate with that server's servlets.
URL codebase = getCodeBase();
if (!"http".equals(codebase.getProtocol())) {
System.out.println();
System.out.println("*** Whoops! ***");
System.out.println("This applet must be loaded from a web server.");
System.out.println("Please try again, this time fetching the HTML");
System.out.println("file containing this servlet as");
System.out.println("\"http://server:port/file.html\".");
System.out.println();
System.exit(1); // Works only from appletviewer
// Browsers throw an exception and muddle on
// Get this user's name from an applet parameter set by the servlet
// We could just ask the user, but this demonstrates a
// form of servlet->applet communication.
user = getParameter("user");
if (user == null) user = "anonymous";
// Set up the user interface...
// On top, a large TextArea showing what everyone's saying.
// Underneath, a labeled TextField to accept this user's input.
text = new TextArea();
text.setEditable(false);
label = new Label("Say something: ");
input = new TextField();
input.setEditable(true);
setLayout(new BorderLayout());
Panel panel = new Panel();
panel.setLayout(new BorderLayout());
add("Center", text);
add("South", panel);
panel.add("West", label);
panel.add("Center", input);
public void start() {
thread = new Thread(this);
thread.start();
String getNextMessage() {
String nextMessage = null;
while (nextMessage == null) {
try {
URL url = new URL(getCodeBase(), "/servlet/TryChatServlet");
HttpMessage msg = new HttpMessage(url);
InputStream in = msg.sendGetMessage();
DataInputStream data = new DataInputStream(
new BufferedInputStream(in));
nextMessage = data.readLine();
catch (SocketException e) {
// Can't connect to host, report it and wait before trying again
System.out.println("Can't connect to host: " + e.getMessage());
try { Thread.sleep(5000); } catch (InterruptedException ignored) { }
catch (FileNotFoundException e) {
// Servlet doesn't exist, report it and wait before trying again
System.out.println("Resource not found: " + e.getMessage());
try { Thread.sleep(5000); } catch (InterruptedException ignored) { }
catch (Exception e) {
// Some other problem, report it and wait before trying again
System.out.println("General exception: " +
e.getClass().getName() + ": " + e.getMessage());
try { Thread.sleep(1000); } catch (InterruptedException ignored) { }
return nextMessage + "\n";
public void run() {
while (true) {
text.appendText(getNextMessage());
public void stop() {
thread.stop();
thread = null;
void broadcastMessage(String message) {
message = user + ": " + message; // Pre-pend the speaker's name
try {
URL url = new URL(getCodeBase(), "/servlet/TryChatServlet");
HttpMessage msg = new HttpMessage(url);
Properties props = new Properties();
props.put("message", message);
msg.sendPostMessage(props);
catch (SocketException e) {
// Can't connect to host, report it and abandon the broadcast
System.out.println("Can't connect to host: " + e.getMessage());
catch (FileNotFoundException e) {
// Servlet doesn't exist, report it and abandon the broadcast
System.out.println("Resource not found: " + e.getMessage());
catch (Exception e) {
// Some other problem, report it and abandon the broadcast
System.out.println("General exception: " +
e.getClass().getName() + ": " + e.getMessage());
public boolean handleEvent(Event event) {
switch (event.id) {
case Event.ACTION_EVENT:
if (event.target == input) {
broadcastMessage(input.getText());
input.setText("");
return true;
return false;
=====================================
HttpMessage
======================================
import java.io.*;
import java.net.*;
import java.util.*;
public class HttpMessage {
URL servlet = null;
String args = null;
public HttpMessage(URL servlet) {
this.servlet = servlet;
// Performs a GET request to the previously given servlet
// with no query string.
public InputStream sendGetMessage() throws IOException {
return sendGetMessage(null);
// Performs a GET request to the previously given servlet.
// Builds a query string from the supplied Properties list.
public InputStream sendGetMessage(Properties args) throws IOException {
String argString = ""; // default
if (args != null) {
argString = "?" + toEncodedString(args);
URL url = new URL(servlet.toExternalForm() + argString);
// Turn off caching
URLConnection con = url.openConnection();
con.setUseCaches(false);
return con.getInputStream();
// Performs a POST request to the previously given servlet
// with no query string.
public InputStream sendPostMessage() throws IOException {
return sendPostMessage(null);
// Performs a POST request to the previously given servlet.
// Builds post data from the supplied Properties list.
public InputStream sendPostMessage(Properties args) throws IOException {
String argString = ""; // default
if (args != null) {
argString = toEncodedString(args); // notice no "?"
URLConnection con = servlet.openConnection();
// Prepare for both input and output
con.setDoInput(true);
con.setDoOutput(true);
// Turn off caching
con.setUseCaches(false);
// Work around a Netscape bug
con.setRequestProperty("Content-Type",
"application/x-www-form-urlencoded");
// Write the arguments as post data
DataOutputStream out = new DataOutputStream(con.getOutputStream());
out.writeBytes(argString);
out.flush();
out.close();
return con.getInputStream();
// Converts a Properties list to a URL-encoded query string
private String toEncodedString(Properties args) {
StringBuffer buf = new StringBuffer();
Enumeration names = args.propertyNames();
while (names.hasMoreElements()) {
String name = (String) names.nextElement();
String value = args.getProperty(name);
buf.append(URLEncoder.encode(name) + "=" + URLEncoder.encode(value));
if (names.hasMoreElements()) buf.append("&");
return buf.toString();
Those files are the only files needed to execute the program.

The whole Tomcat crashes, and no exception
displayed.
Do I have to write the log file, or it's kept by
Tomcat itself?yes, tomcat writes a log file, you find it in the tomcat dir. but it's just very highlevel. Having a look in it could help.
Is there a way to write a log file by myself?sure. you could get the log file from tomcat by getting it from the ServletContext:
ServletContext = getServletContext();
ServletContext.log("text to log");
When I view the output window in Forte, it doesn't
even write that Tomcat crashed.
I use Tomcat that is installed with the last version
of Forte(Sun 1 Studio, update 1), I guess it's the
last version of Tomcat also.No. The lastest is 4.1.12 and i guess it's 4.0.4 with forte.
Get Tomcat standalone from jakarta.apache.org and try to run your servlet with the standalone tomcat. this could help since i also expirenced problems sometimes with the forte-integrated tomcat.

Mobile apps with phonegap + mysql ?

Hi,
i was searching for a long time but didn't find answers. is it possible to show database-driven content within mobile apps made with dreamweaver cs6 ?
If so, are there any examples or tutorials on the adobesite or elsewhere?
Looking forward for any answer :-)

PhoneGap builds mobile apps with HTML, CSS, and JavaScript. You cannot use a server-side language, such as PHP, with PhoneGap.
Presumably, you want to connect with a MySQL database on a remote server. To do so, you would need to use Ajax to send and receive data from the MySQL database. You can use jQuery to send and receive data as JSON. PHP has JSON functions that decode and encode data as JSON strings.
How difficult or easy you would find setting this up depends on your knowledge of jQuery and PHP. I don't know of any tutorials that show how to pull everything together for PhoneGap, but it shouldn't be too difficult to find tutorials for using jQuery Ajax to communicate with MySQL.

Integrate A Chat Program with a Web Page

iIn JSP Based Web Page
Integrate A Chat Program with a Web Page

I have an iPad 3rd generation and I get that message as well so it has nothing to do with having an iPad 2. The message means exact,y what it says, there was a problem loading the web site. In some situations, it just might be a problem with the website itself. Please note that I said in "some" situations. If you are getting this message every single time that you try to load a page, something is wrong.
Did you clear Safari, close all apps and then reset the iPad? Settings>Safari>Clear history and website data.
Now close all apps. In order to close apps, you have to drag the app up from the multitasking display. Double tap the home button and you will see apps lined up going left to right across the screen. Swipe to get to the app that you want to close and then swipe "up" on the app preview thumbnail to close it.
Next, reset the iPad by holding down on the sleep and home buttons at the same time for about 10-15 seconds until the Apple Logo appears - ignore the red slider if it appears on the screen - let go of the buttons. Let the iPad start up.

Servlet chat app with ajax

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