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    <p>One way of simulating push notifications is <a href="http://en.wikipedia.org/wiki/Push_technology#Long_polling" rel="noreferrer">long polling</a>. This technique is called <a href="http://en.wikipedia.org/wiki/Reverse_Ajax" rel="noreferrer">Comet or Reverse AJAX</a>. While it's more common in REST based services, it can be just as easily accomplished in JAX-WS.</p> <p>For JAX-WS you will want to investigate:</p> <ul> <li><a href="http://today.java.net/pub/a/today/2006/09/19/asynchronous-jax-ws-web-services.html" rel="noreferrer">asynchronous web service invocation</a></li> <li><a href="http://www.ibm.com/developerworks/websphere/library/techarticles/0804_sedov/0804_sedov.html" rel="noreferrer">JAX-WS client APIs ... Using the JAX-WS asynchronous programming model</a></li> </ul> <blockquote> <p>Have the client call a webservice every 10 minutes to check if there are any new notifications</p> </blockquote> <p>Instead with long polling, you make the initial client connection right away. But instead of the server responding immediately, it hangs onto the connection (asynchronously). Then when a notification needs to be pushed, it responds back on the existing connection.</p> <p>With this technique, as soon as information is available on the server, it will be "pushed" to the client.</p> <blockquote> <p>For the database create a notification table and notifications seen. Link my users table to notifications seen table. Notifications seen is very basic with just 3 columns: NotificationID, UserID, TimeSeen.</p> </blockquote> <p>Sounds good. Expose it as a JAX-WS service. When the client receives the message, have them invoke it with the NotificationID.</p> <p>Something like:</p> <pre><code>NotificationService svc = ...; UserId userId = ...; AsyncHandler&lt;Notification&gt; handler = new AsyncHandler&lt;Notification&gt;() { public void handleResponse (Response&lt;Notification&gt; response) { Notification notification = response.get(); // update swing gui NotificationID notificationId = notifcation.getId(); svc.markNotificationAsSeen(userId, notificationId); // continue polling forever (or put in some logic to stop) svc.getNotificationAsync(userId, this); } }; Future&lt;?&gt; invocation = svc.getNotificationAsync(userId, handler); </code></pre>
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