In testing the latest component-showcase-portlets example in the icefaces2/trunk, I ran into a problem with delta submit. It looks like a recent change that delta submit has been enabled by default for the component-showcase example.

    <context-param>
        <param-name>org.icefaces.deltaSubmit</param-name>
        <param-value>true</param-value>
    </context-param>

When running the example on WebSphere Portal 7 with the latest PortletFaces bridge and the ICEfaces EE extensions, I ran into the following:

java.lang.ClassCastException: com.ibm.ws.portletcontainer.core.impl.ResourceRequestImpl incompatible with javax.portlet.ActionRequest
at org.icefaces.impl.event.DeltaSubmitPhaseListener.reconstructParametersFromDeltaSubmit(DeltaSubmitPhaseListener.java:157)
at org.icefaces.impl.event.DeltaSubmitPhaseListener.beforePhase(DeltaSubmitPhaseListener.java:58)
at com.sun.faces.lifecycle.Phase.handleBeforePhase(Phase.java:228)
at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:99)
at com.sun.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:118)
at org.portletfaces.bridge.BridgeImpl.doFacesRequest(BridgeImpl.java:513)
at org.portletfaces.bridge.GenericFacesPortlet.serveResource(GenericFacesPortlet.java:131
...

The code in the phase listener is casting to an ActionRequest which, for some requests, is too specific. While the request could be an ActionRequest, it's more likely to be a ResourceRequest as that is how Ajax requests are treated.