The new ice:dataExporter component does not work inside a portlet as the component cannot get the HTTPSession from a portal environment. I noticed that this component was not included in the component showcase for portlets so I assume that this may be a know issue but not reported.

14:15:07,484 ERROR [[Blocking Servlet]] Servlet.service() for servlet Blocking Servlet threw exception
java.lang.ClassCastException: com.icesoft.faces.webapp.http.portlet.InterceptingPortletSession
        at com.icesoft.faces.component.dataexporter.DataExporterRenderer.createFile(DataExporterRenderer.java:132)
        at com.icesoft.faces.component.dataexporter.DataExporterRenderer.encodeBegin(DataExporterRenderer.java:42)
        at javax.faces.component.UIComponentBase.encodeBegin(UIComponentBase.java:813)
        at com.icesoft.faces.renderkit.dom_html_basic.DomBasicRenderer.encodeParentAndChildren(DomBasicRenderer.java:353)
        at com.icesoft.faces.renderkit.dom_html_basic.GridRenderer.encodeChildren(GridRenderer.java:208)
        at javax.faces.component.UIComponentBase.encodeChildren(UIComponentBase.java:837)
        at com.icesoft.faces.renderkit.dom_html_basic.DomBasicRenderer.encodeParentAndChildren(DomBasicRenderer.java:355)
        at com.icesoft.faces.renderkit.dom_html_basic.GroupRenderer.encodeChildren(GroupRenderer.java:96)
        at javax.faces.component.UIComponentBase.encodeChildren(UIComponentBase.java:837)
        at com.icesoft.faces.renderkit.dom_html_basic.DomBasicRenderer.encodeParentAndChildren(DomBasicRenderer.java:355)
        at com.icesoft.faces.renderkit.dom_html_basic.GroupRenderer.encodeChildren(GroupRenderer.java:96)
        at javax.faces.component.UIComponentBase.encodeChildren(UIComponentBase.java:837)
        at com.icesoft.faces.component.util.CustomComponentUtils.renderChild(CustomComponentUtils.java:339)
        at com.icesoft.faces.component.paneltabset.PanelTabSetRenderer.writeTabCell(PanelTabSetRenderer.java:908)
        at com.icesoft.faces.component.paneltabset.PanelTabSetRenderer.encodeEnd(PanelTabSetRenderer.java:421)
        at javax.faces.component.UIComponentBase.encodeEnd(UIComponentBase.java:861)
        at com.icesoft.faces.renderkit.dom_html_basic.DomBasicRenderer.encodeParentAndChildren(DomBasicRenderer.java:367)
        at com.icesoft.faces.renderkit.dom_html_basic.GroupRenderer.encodeChildren(GroupRenderer.java:96)
        at javax.faces.component.UIComponentBase.encodeChildren(UIComponentBase.java:837)
        at com.icesoft.faces.renderkit.dom_html_basic.DomBasicRenderer.encodeParentAndChildren(DomBasicRenderer.java:355)
        at com.icesoft.faces.renderkit.dom_html_basic.DomBasicRenderer.encodeParentAndChildren(DomBasicRenderer.java:362)
        at com.icesoft.faces.renderkit.dom_html_basic.GroupRenderer.encodeChildren(GroupRenderer.java:96)
        at javax.faces.component.UIComponentBase.encodeChildren(UIComponentBase.java:837)
        at com.icesoft.faces.renderkit.dom_html_basic.DomBasicRenderer.encodeParentAndChildren(DomBasicRenderer.java:355)
        at com.icesoft.faces.renderkit.dom_html_basic.GroupRenderer.encodeChildren(GroupRenderer.java:96)
        at javax.faces.component.UIComponentBase.encodeChildren(UIComponentBase.java:837)
        at com.icesoft.faces.renderkit.dom_html_basic.DomBasicRenderer.encodeParentAndChildren(DomBasicRenderer.java:355)
        at com.icesoft.faces.renderkit.dom_html_basic.GroupRenderer.encodeChildren(GroupRenderer.java:96)
        at javax.faces.component.UIComponentBase.encodeChildren(UIComponentBase.java:837)
        at com.icesoft.faces.application.D2DViewHandler.renderResponse(D2DViewHandler.java:517)
        at com.icesoft.faces.application.D2DViewHandler.renderResponse(D2DViewHandler.java:522)
        at com.icesoft.faces.application.D2DViewHandler.renderResponse(D2DViewHandler.java:522)
        at com.icesoft.faces.facelets.D2DFaceletViewHandler.renderResponse(D2DFaceletViewHandler.java:282)
        at com.icesoft.faces.application.D2DViewHandler.renderView(D2DViewHandler.java:153)
        at com.sun.faces.lifecycle.RenderResponsePhase.execute(RenderResponsePhase.java:109)
        at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:100)
        at com.sun.faces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:139)
        at com.icesoft.faces.webapp.http.core.JsfLifecycleExecutor.apply(JsfLifecycleExecutor.java:17)
        at com.icesoft.faces.webapp.http.core.ReceiveSendUpdates.renderCycle(ReceiveSendUpdates.java:114)
        at com.icesoft.faces.webapp.http.core.ReceiveSendUpdates.service(ReceiveSendUpdates.java:66)
        at com.icesoft.faces.webapp.http.core.RequestVerifier.service(RequestVerifier.java:26)
        at com.icesoft.faces.webapp.http.common.standard.PathDispatcherServer.service(PathDispatcherServer.java:24)
        at com.icesoft.faces.webapp.http.servlet.MainSessionBoundServlet.service(MainSessionBoundServlet.java:160)
        at com.icesoft.faces.webapp.http.servlet.SessionDispatcher$1.service(SessionDispatcher.java:30)
        at com.icesoft.faces.webapp.http.servlet.ThreadBlockingAdaptingServlet.service(ThreadBlockingAdaptingServlet.java:19)
        at com.icesoft.faces.webapp.http.servlet.EnvironmentAdaptingServlet.service(EnvironmentAdaptingServlet.java:63)
        at com.icesoft.faces.webapp.http.servlet.SessionDispatcher.service(SessionDispatcher.java:50)
        at com.icesoft.faces.webapp.http.servlet.SessionVerifier.service(SessionVerifier.java:22)
        at com.icesoft.faces.webapp.http.servlet.PathDispatcher.service(PathDispatcher.java:23)
        at com.icesoft.faces.webapp.http.servlet.MainServlet.service(MainServlet.java:155)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
        at com.icesoft.faces.webapp.xmlhttp.BlockingServlet.service(BlockingServlet.java:56)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
        at org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:96)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
        at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:230)
        at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
        at org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssociationValve.java:182)
        at org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:84)
        at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
        at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
        at org.jboss.web.tomcat.service.jca.CachedConnectionValve.invoke(CachedConnectionValve.java:157)
        at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
        at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:262)
        at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844)
        at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:583)
        at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:446)
        at java.lang.Thread.run(Thread.java:595)