Did you find the answer for this? I am trying to achive the same behavior with portal 2.4 and wanted to know if this was possible too.
We don't support event based IPC yet as it will be part of the Portlet 2.0 spec and we don't want to create an API that we would deprecate in the near future...
I think there are way to simulate this using application session.
I am newbie to portals, i am using jboss portal 2.7.2 and i tried to do IPC portlets using the examples given, but i am facing some issues. Please do post me ur working code for Inter portlet communication... so that it may be helpful for me to go ahead and get it done.
Post your code to email@example.com
Waiting for your response.