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java.lang.NullPointerException: 	at org.springframework.faces.webflow.FlowViewStateManager.saveView(FlowViewStateManager.java:181)	at com.sun.faces.application.view.WriteBehindStateWriter.flushToWriter(WriteBehindStateWriter.java:221)	at com.sun.faces.application.view.FaceletViewHandlingStrategy.renderView(FaceletViewHandlingStrategy.java:406)	at com.sun.faces.application.view.MultiViewHandler.renderView(MultiViewHandler.java:127)	at org.springframework.faces.webflow.FlowViewHandler.renderView(FlowViewHandler.java:99)	at javax.faces.application.ViewHandlerWrapper.renderView(ViewHandlerWrapper.java:269)	at org.springframework.faces.webflow.FlowViewHandler.renderView(FlowViewHandler.java:99)	at com.sun.faces.lifecycle.RenderResponsePhase.execute(RenderResponsePhase.java:117)	at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:97)	at com.sun.faces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:135)	at org.springframework.springfaces.FacesView.renderMergedOutputModel(FacesView.java:39)	at org.springframework.web.servlet.view.AbstractView.render(AbstractView.java:250)	at org.springframework.web.servlet.DispatcherServlet.render(DispatcherServlet.java:1047)	at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:817)	at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:719)	at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:644)	at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:549)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:617)	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.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:127)	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:298)	at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:859)	at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:588)	at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489)	at java.lang.Thread.run(Thread.java:662)