Here are the steps:
- Get the portlet from here: http://wiki.java.net/bin/view/OpenPortal/RSSPortlet
- Do the usual gridsphere stuff: you will need to modify web.xml, copy over the gridsphere-portlet.xml from a working portlet into WEB-INF, copy over a gridsphere-ui-tags.jar from a working portlet into WEB-INF/lib. Also a group.xml and layout.xml file in WEB-INF will help. Plenty of examples of this over at http://www.collab-ogce.org/.
- Also touch webapps/gridsphere/WEB-INF/CustomPortal/portlets/rssportlet
- For some reason, the Sun portlet doesn't include the necessary jars to support the portlet's tag libraries, so you will need to get these and put them into WEB-INF/lib: jstl-1.0.6.jar, standard-1.0.6.jar.
content-0.4.1.jar jdom-1.0.jar rome-0.8.jar
gridsphere-ui-tags-2.1.jar jstl-1.0.6.jar standard-1.0.6.jar
Probably there is an easier way, but around here we like to do it the bassackwards way.