Building a Web Service Powered JSR 168 Financial Portlet

An increasing number of web applications built today use portal technology. A portal is a web application that typically provides services such as personalization, single sign-on, and content aggregation from different sources. Aggregation is the action of integrating content from different sources within a web page. Portlets are the visible active components that users see within their portal pages. In the simplest terms, for Java-based portals, a portlet is a Java servlet that operates inside a portal.