I need to know if there is a way to get the logged in username in WCM JSP component in IBM Websphere Portal 8. I dont even know where to begin looking for this solution.
I believe you can get current username via
request.getUserPrincipal().getName()
You can use Puma api as well to get more detailed user information.
Example
http://blog.manishchhabra.com/2011/05/ibm-portal-user-management-architecture-puma-spi/
Javadoc
http://public.dhe.ibm.com/software/dw/lotus/portal_javadoc/80/portal/spi_docs/index.html