I am facing the same problem in HelloworldIPC portlet. Was trying to test how inter portlet communication works. I have made a war file using build.xml with ant tool. Initially it contained only the xml files. The classe files are added to this war file with the package structure. Then deployed the same. It shows the IPC tab and upon clicking it shows the PortletA and PortletB. Upon giving some data and submitting it throws an error in console. The error is An portlet exception occured in portlet helloworldipc.HelloWorldPortletA javax.portlet.PortletException: Nothing to invoke at org.jboss.portlet.JBossPortlet.doDispatch(JBossPortlet.java:173) at org.jboss.portlet.JBossPortlet.processAction(JBossPortlet.java:96) at org.jboss.portlet.JBossPortlet.processAction(JBossPortlet.java:342) at org.jboss.portal.portlet.PortletContainer.invokeAction(PortletContainer.java:470) I tried creating war file using jar cvf command also. In both the cases it throws the same error. jdk 1.5 and jboss-portal-2.2.1 are used. Could anyone please send the .war file of the HelloworldIPC portlet example which works fine. Or atleast list down what all xml files and other files (with the package structutre) which should be there in .war file ? View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3986764#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...