The goal is to refresh a JSP web page on a web browser when the Derby DB on the server is changed.
I agree with Ronald Rudy's observation that the web browser itself will need to initiate the polling request. Meanwhile, on the server side, Derby supports triggers, which you can use to track the changes on the server side, which will help you make your polling efficient: http://db.apache.org/derby/docs/10.5/devguide/cdevspecial27163.html thanks, bryan
