The tabView component throws the following exception when deployed in a clustered environment:

SEVERE: Servlet.service() for servlet Persistent Faces Servlet threw exception
java.lang.IllegalArgumentException: setAttribute: Non-serializable attribute
        at org.apache.catalina.session.StandardSession.setAttribute(StandardSession.java:1295)
        at org.apache.catalina.session.StandardSession.setAttribute(StandardSession.java:1256)
        at org.apache.catalina.session.StandardSessionFacade.setAttribute(StandardSessionFacade.java:130)
        at com.icesoft.faces.webapp.http.servlet.ProxyHttpSession.setAttribute(ProxyHttpSession.java:139)
        at com.icesoft.faces.webapp.http.servlet.ServletSessionAttributeMap.setAttribute(ServletSessionAttributeMap.java:52)
        at com.icesoft.faces.context.AbstractAttributeMap.put(AbstractAttributeMap.java:156)
        at com.sun.faces.mgbean.BeanManager$ScopeManager$SessionScopeHandler.handle(BeanManager.java:442)
        at com.sun.faces.mgbean.BeanManager$ScopeManager.pushToScope(BeanManager.java:417)
        at com.sun.faces.mgbean.BeanManager.createAndPush(BeanManager.java:369)
        at com.sun.faces.mgbean.BeanManager.create(BeanManager.java:222)
        at com.sun.faces.el.ManagedBeanELResolver.getValue(ManagedBeanELResolver.java:86)
        at javax.el.CompositeELResolver.getValue(CompositeELResolver.java:54)
        at com.sun.faces.el.FacesCompositeELResolver.getValue(FacesCompositeELResolver.java:72)
        at org.apache.el.parser.AstIdentifier.getValue(AstIdentifier.java:61)
        at org.apache.el.parser.AstValue.getValue(AstValue.java:107)
        at org.apache.el.ValueExpressionImpl.getValue(ValueExpressionImpl.java:186)
        at com.sun.facelets.el.TagValueExpression.getValue(TagValueExpression.java:71)
        at com.sun.facelets.el.LegacyValueBinding.getValue(LegacyValueBinding.java:56)
        at com.icesoft.faces.component.UIXhtmlComponent.getTagAttributes(UIXhtmlComponent.java:103)
        at com.icesoft.faces.renderkit.dom_html_basic.XMLRenderer.encodeBegin(XMLRenderer.java:52)
        at javax.faces.component.UIComponentBase.encodeBegin(UIComponentBase.java:813)
        at com.icesoft.faces.application.D2DViewHandler.renderResponse(D2DViewHandler.java:490)
        at com.icesoft.faces.application.D2DViewHandler.renderResponse(D2DViewHandler.java:498)
        at com.icesoft.faces.application.D2DViewHandler.renderResponse(D2DViewHandler.java:498)
        at com.icesoft.faces.application.D2DViewHandler.renderResponse(D2DViewHandler.java:498)
        at com.icesoft.faces.application.D2DViewHandler.renderResponse(D2DViewHandler.java:498)
        at com.icesoft.faces.application.D2DViewHandler.renderResponse(D2DViewHandler.java:498)
        at com.icesoft.faces.facelets.D2DFaceletViewHandler.renderResponse(D2DFaceletViewHandler.java:281)
        at com.icesoft.faces.application.D2DViewHandler.renderView(D2DViewHandler.java:158)
        at com.sun.faces.lifecycle.RenderResponsePhase.execute(RenderResponsePhase.java:110)
        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:51)
        at com.icesoft.faces.context.View$2$1.respond(View.java:80)
        at com.icesoft.faces.webapp.http.servlet.ServletRequestResponse.respondWith(ServletRequestResponse.java:233)
        at com.icesoft.faces.context.View$2.serve(View.java:114)
        at com.icesoft.faces.context.View.servePage(View.java:186)
        at com.icesoft.faces.webapp.http.core.SingleViewServer.service(SingleViewServer.java:84)
        at com.icesoft.faces.webapp.http.common.ServerProxy.service(ServerProxy.java:43)
        at com.icesoft.faces.webapp.http.servlet.MainSessionBoundServlet$4.service(MainSessionBoundServlet.java:181)
        at com.icesoft.faces.webapp.http.common.standard.PathDispatcherServer.service(PathDispatcherServer.java:55)
        at com.icesoft.faces.webapp.http.servlet.BasicAdaptingServlet.service(BasicAdaptingServlet.java:48)
        at com.icesoft.faces.webapp.http.servlet.PathDispatcher.service(PathDispatcher.java:55)
        at com.icesoft.faces.webapp.http.servlet.SessionDispatcher.service(SessionDispatcher.java:92)
        at com.icesoft.faces.webapp.http.servlet.PathDispatcher.service(PathDispatcher.java:55)
        at com.icesoft.faces.webapp.http.servlet.MainServlet.service(MainServlet.java:183)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
        at org.netbeans.modules.web.monitor.server.MonitorFilter.doFilter(MonitorFilter.java:390)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
        at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
        at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
        at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)
        at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
        at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
        at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:293)
        at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:849)
        at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:583)
        at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:454)
        at java.lang.Thread.run(Thread.java:619)

To reproduce this in a non-clustered environment I added the <distributable/> tag to my applications web.xml and ran it on Tomcat with session persistence turned on (default).