DWR is the way for AJAX implementation

				package org.getahead.dwrdemo.chat;								/**				 * A POJO that represents a typed message				 * @author Joe Walker [joe at getahead dot ltd dot uk]				 */				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;				}