public class JavaChat
{
    /**
     * @param text The new message text to add
     */
    public void addMessage(String text)
    {
        // Make sure we have a list of the list 10 messages
        if (text != null && text.trim().length() > 0)
        {
            messages.addFirst(new Message(text));
            while (messages.size() > 10)
            {
                messages.removeLast();
            }
        }
 
        WebContext wctx = WebContextFactory.get();
        String currentPage = wctx.getCurrentPage();
 
        // Clear the input Box in the browser that kicked off this page only
        Util utilThis = new Util(wctx.getScriptSession());
        utilThis.setValue("text","");
 
        // For all the browsers on the current page:
        Collection sessions = wctx.getScriptSessionsByPage(currentPage);
        Util utilAll = new Util(sessions);
 
        // Clear the list and add in the new set of messages
        utilAll.removeAllOptions("chatlog");
        utilAll.addOptions("chatlog",messages,"text");
    }
 
    /**
     * The current set of messages
     */
    private LinkedList messages = new LinkedList();
 
    /**
     * The log stream
     */
    protected static final Logger log = Logger.getLogger(JavaChat.class);
}

public class Message
{
    /**
     * @param newtext the new message text
     */
    public Message(String newtext)
    {
        text = newtext;
 
        if (text.length() > 256)
        {
            text = text.substring(0,256);
        }
    }
 
    /**
     * @return the message id
     */
    public long getId()
    {
        return id;
    }
 
    /**
     * @return the message itself
     */
    public String getText()
    {
        return text;
    }
 
    /**
     * When the message was created
     */
    private long id = System.currentTimeMillis();
 
    /**
     * The text of the message
     */
    private String text;
}

<dwr>
 
  <allow>
 
	 <!-- chat -->
    <create creator="new" javascript="JavascriptChat" scope="application">
      <param name="class" value="org.getahead.dwrdemo.chat.JavascriptChat"/>
    </create>
    <create creator="new" javascript="JavaChat" scope="application">
      <param name="class" value="org.getahead.dwrdemo.chat.JavaChat"/>
    </create>
    <convert converter="bean" match="org.getahead.dwrdemo.chat.Message"/>
 
  </allow>
 
</dwr>