On the way upgrading from 4.0.5.CR1 to 4.0.5.GA the following exception appears. Not much found on Google, i'll keep investigating. 19:48:26,344 ERROR [STDERR] 23.10.2006 16:48:26 com.sun.facelets.FaceletViewHandler handleRenderException | SEVERE: Error Rendering View[/choose_location.xhtml] | java.lang.NullPointerException: serialFactory | at org.apache.myfaces.shared_impl.util.StateUtils.getAsByteArray(StateUtils.java:174) | at org.apache.myfaces.shared_impl.util.StateUtils.construct(StateUtils.java:150) | at org.apache.myfaces.renderkit.html.HtmlResponseStateManager.writeState(HtmlResponseStateManager.java:73) | at org.apache.myfaces.application.jsp.JspStateManagerImpl.writeState(JspStateManagerImpl.java:430) | at org.jboss.seam.jsf.SeamStateManager.writeState(SeamStateManager.java:53) | at com.sun.facelets.FaceletViewHandler.renderView(FaceletViewHandler.java:606) | at org.apache.myfaces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:384) | at org.apache.myfaces.portlet.MyFacesGenericPortlet.nonFacesRequest(MyFacesGenericPortlet.java:322) | at org.apache.myfaces.portlet.MyFacesGenericPortlet.nonFacesRequest(MyFacesGenericPortlet.java:297) | at fi.jab.jsf.MyFacesGenericPortlet.facesRender(MyFacesGenericPortlet.java:61) | at org.apache.myfaces.portlet.MyFacesGenericPortlet.doView(MyFacesGenericPortlet.java:265) | at javax.portlet.GenericPortlet.doDispatch(GenericPortlet.java:235) | at javax.portlet.GenericPortlet.render(GenericPortlet.java:163) | | View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3980105#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...