no it is Pluto, although JetSpeed2 is also using pluto in its core.

there are two big problems with JetSpeed, first one is it is even older than JSR 168 it self, and its architecture  is a little bit old, second is it lacks a big company supporting its development.

but there are also two good  thing good about it, first one is apache license and second is most of its portlet classes are extended from their similar HTTP classes, so you can cast them to the parent HTTP class and use them in frameworks that don't support portlet.

exo and liferay are also good portals but they have their own technical and non technical problems; and thats why I have started a new portal  project (I am currently searching for an sponsor company to sponsor the development)

> You must be a JAVA SUPER EXPERT to write a simple hello world  portlet and should be a SUPER HERO to be able to deploy it in a portal.

I don't agree with this one too, using Java Studio Creator (now Netbeans with web  pack) and pluto it is very very easy to develop a portlet and deploy it, it is as easy as dropping some JSF components from palette to page, and clicking on run button. there is no portlet knowledge needed here.