Those of you which has access to larger deployments, probably has an idea which portlet technologies are used the most.
I know that Liferay integrates many of the portlet technologies, but such an information to estimate which are the most promissing or most used technologies, or which are the worst case scenarios, I would like to read here.
In these days I migrated 11 portlets from classic webapp environment into Liferay portlets. I just kept the used technologies, in my situation I had 3 portlets written in spring-mvc and the rest in spring-webflow with the same mvc view technology.
In the future, eventually I would consider other portlet technologies.