chatting program

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Hi

I was testing the examples of chatting program from Jason Hunters Servlet
Prog book for our requirements.If you would have went through then
Chap 10, servlet class ChatDispatch to select a type Http,Soc or RMI
Then Applet HttpAppletClass which initiates ChatServer servlet,

My problem is I've done everything as instructed in the book and the applet
gets loaded but doesn't do anything.
The applet HttpAppletClass has some methods depreciated and could this be
the problem?? I am using Tomcat 4 and put all my servlets inside examples
directory and use tomcat only

a part of code

while (nextMessage == null) {
          try {
                URL url = new URL(getCodeBase(),
"/examples/servlet/ChatServlet");
                HttpMessage msg = new HttpMessage(url);
                InputStream in = msg.sendGetMessage();
                DataInputStream data = new DataInputStream(
                                                           new
BufferedInputStream(in));
                nextMessage = data.readLine();

and I get the following error from my VAJAVA IDE 3.5

"The method readLine invoked for type java.io.DataInputStream with arguments
() is deprecated"

There are two other methods also with this depreciateion start() and Stop()

Could this be the problem or am I missing something else?. I know I'll have
to read the API's but am not so used to it <grin>?????

TIA

Thanks
Rizwan