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From: Knute Johnson <nospam@rabbitbrush.frazmtn.com>
Newsgroups: comp.lang.java.gui
Subject: Re: Dynamic updation of a JTextArea
Date: Wed, 14 Dec 2016 09:14:26 -0600
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On 12/14/2016 08:16, abhprk3926@gmail.com wrote:
> I created a multi user chat system using sockets in java . everything
> works perfect but a little issue. the common jtextarea where i am
> supposed to display the chats ( its a app wherein all the users write
> messages and the message of all the users is visible in their chat
> space. Unfortunately the jtextarea is not updating itself whenever a
> client writes a message . I tried doing like
> System.out.print(contents of the common textarea) . In the command
> prompt every single message written is displayed , which means the
> code is working as intended . its just the textarea is not updating
> itself. i searched many forums even tried doing the update thing in a
> different thread than EDT but still i have the same problem. Can
> anyone help me out ? Here is the code .
>
> public void run() { try { DataInputStream in = new
> DataInputStream(client.getInputStream());    //client is the socket
> object clientName = in.readUTF();
> //clientname is a string which stores the name of the clients
>
> s = "Joined"; SwingUtilities.invokeLater(new Runnable(){ public void
> run() { clientChat.ta.append(clientName+": "+s);         //clientchat
> is the name of the Client class and ta is the common textarea object
> which is declared as a static variable } });
>
> while(!s.equals("terminate")) { s=in.readUTF();
> SwingUtilities.invokeLater(new Runnable(){ public void run() {
> clientChat.ta.append(clientName+": "+s); } }); }
>
> }catch(Exception e){e.printStackTrace();} }
>
> every time a new client joins a new thread is created that acts as a
> server for the client. this is the class where the updation of the
> textarea is taking place. any help would be greatly praised.
>

I don't see anything obvious in your code but I'm only seeing a piece of
it.  I suggest you try making an SSCCE and duplicating your problem or
maybe it will help you discover an answer.  Oh and formatting your code 
a little more neatly would help too.  Post an SSCCE here if you can't 
get it to work.

-- 

Knute Johnson