hi there, I have faced the same issue as you do. The quick solution: Look into the Jboss Portal Reference Guide 2.6 (http://docs.jboss.com/jbportal/v2.6/reference-guide/en/html_single/#ipc). There you find the correct link to the HelloWorldIPC sample: http://anonsvn.jboss.org/repos/portletswap/portlets/2_4/bundles/HelloWorl... I've tested the included SAR-File helloworldipcportlet.sar with Jboss-Portal-2.4.0 and it works immediately, no exceptions show up in the log file. In fact, this is really a nice feature to have. Issues I've found: Regarding Jboss Portal 2.2.1: The provided HelloWorldIPC sample mentioned in the Reference Doc (http://labs.jboss.com/file-access/default/members/portletswap/downloads/p...) does not work with Jboss Portal 2.2.1 SP3. You get the following exception: java.lang.NoSuchMethodError: org.jboss.portlet.event.node.WindowActionEvent.getParameters()Lorg/jboss/portal/server/util/Parameters; org.jboss.portlet.hello.HelloWorldPortletB$Listener.onEvent(Unknown Source) It seems that the sample requires a method which has not been implemented in Jboss-Portal-2.2.1. I've inspected the source and found that WindowActionEvent derives from WindowEvent, which supports HashMap getParameters(), but not Parameters getParameter(). This is probably the reason, but I don't know how to fix. Regarding Jboss Portal 2.4-documentation: However, the IPC chapter has been (apparently accidentally) completely removed from the Jboss Portal 2.4-documentation (http://docs.jboss.com/jbportal/v2.4/reference-guide/en/html_single/#ipc), althougth IPC is mentioned in the feature list at the beginning. Regarding Jboss Portal 2.6DR: The sample of HelloWorldIPC for 2.4 works, but only after deployed HOT. If you deploy it before startup, there are definitely lots of classloading-related exceptions. best regards, johannes View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3990790#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...