"briandehaven" wrote : Found the problem. Simple fix in the end. You need to 
add the Required transaction attribute. The above portlet now spits out the 
entire deployed PortalNode structure. It should be easy to modify into a 
breadcrumb and/or sitemap portlet.
  | 
  | jboss-portlet.xml
  | 
  |   |    <portlet>
  |   |       <portlet-name>PageLinkPortlet</portlet-name>
  |   |       <transaction>
  |   |          <trans-attribute>Required</trans-attribute>
  |   |       </transaction>
  |   |    </portlet>
  |   | 
  | 

Thanks for your post, briandehaven! I didn't complete get your point. Do I have 
to add your new portlet to make the HelloWorldIPC example work? Or I can simply 
add the transaction attribute to the existing PortletA and PortletB instance?

I think a lot of people like myself are still suffering this issue. I 
appreciate if you can share more details!

Thanks, 
Linpei

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