java.lang.NullPointerException com.sun.faces.context.StateContext.startTrackViewModifications(StateContext.java:173) com.sun.faces.application.view.FaceletViewHandlingStrategy.restoreView(FaceletViewHandlingStrategy.java:515) com.sun.faces.application.view.MultiViewHandler.restoreView(MultiViewHandler.java:142) org.springframework.faces.webflow.FlowViewHandler.restoreFlowView(FlowViewHandler.java:144) org.springframework.faces.webflow.FlowViewHandler.restoreView(FlowViewHandler.java:83) javax.faces.application.ViewHandlerWrapper.restoreView(ViewHandlerWrapper.java:303) org.springframework.faces.webflow.FlowViewHandler.restoreFlowView(FlowViewHandler.java:144) org.springframework.faces.webflow.FlowViewHandler.restoreView(FlowViewHandler.java:83) org.springframework.faces.webflow.JsfViewFactory.getView(JsfViewFactory.java:105) org.springframework.webflow.engine.ViewState.resume(ViewState.java:193) org.springframework.webflow.engine.Flow.resume(Flow.java:545) org.springframework.webflow.engine.impl.FlowExecutionImpl.resume(FlowExecutionImpl.java:258) org.springframework.webflow.executor.FlowExecutorImpl.resumeExecution(FlowExecutorImpl.java:169) org.springframework.webflow.mvc.servlet.FlowHandlerAdapter.handle(FlowHandlerAdapter.java:183) org.springframework.faces.webflow.JsfFlowHandlerAdapter.handle(JsfFlowHandlerAdapter.java:48) org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:923) org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:852) org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:882) org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:778) javax.servlet.http.HttpServlet.service(HttpServlet.java:617) javax.servlet.http.HttpServlet.service(HttpServlet.java:717)