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It is provided by Jboss team. Jboss Portal meets JSR301 specyfication and Portles follow JSR286. This is abstraction layer added to webpage served by application servers. All is done to simplify creating portals. Portlets are components for interacting with portlet container.Each portlet are in separate window. Portal has to agregate content, with this technology it’s easy. If you want put forum on Portal, you simply copy file with forum portlet to deploy directory and that’s all. Forum portlet can use global portal authentication, and also has aditional preferences, user can for example minimize window with forum. More details I give you in future.

Yes, Java Seam is another solution for ajax ready web pages. This technology connect together server and client side. One disadvantage was that it’s need java enabled serwer, but for corporation and many companies it’s not a problem, becouse they allready have some java applications on some application server. Seam is new Java framework, inside have Hibernate, EJB3, JSF and support jBPM. Nice featur of seam is that it support Ajax in easy way. You have full support for Richfaces,and with some easy integration you can use GWT, DOJO or Tibco GI or even Flex. In my opinion Jboss Seam go in right direction. You can only focus on bussines problem to solve and with Seam you gain top application production speed. Becouse in Seam all possible things are under the hood.
For example state managment: obiects can be: statless, event, page, session, conversion, bussines process, application. One nice feature is support for executing functions like programs in Linux Cron. Application in Seam are easy to maintain. Please think abut it: prduction speed - ten times faster and ten times less bugs. Yes,one thing i have to add this is possible if you know Seam, Java, Jboss and SQL very well.