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java.lang.NullPointerException: 	at org.springframework.faces.webflow.FlowViewResponseStateManager.writeState(FlowViewResponseStateManager.java:84)	at com.sun.faces.application.StateManagerImpl.writeState(StateManagerImpl.java:155)	at org.springframework.faces.webflow.FlowViewStateManager.writeState(FlowViewStateManager.java:114)	at com.sun.faces.application.view.WriteBehindStateWriter.flushToWriter(WriteBehindStateWriter.java:221)	at com.sun.faces.application.view.FaceletViewHandlingStrategy.renderView(FaceletViewHandlingStrategy.java:397)	at com.sun.faces.application.view.MultiViewHandler.renderView(MultiViewHandler.java:126)	at org.springframework.faces.webflow.FlowViewHandler.renderView(FlowViewHandler.java:99)	at com.sun.faces.lifecycle.RenderResponsePhase.execute(RenderResponsePhase.java:127)	at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:101)	at com.sun.faces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:139)	at javax.faces.webapp.FacesServlet.service(FacesServlet.java:313)	at org.apache.catalina.core.StandardWrapper.service(StandardWrapper.java:1523)	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:279)	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:188)	at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:641)	at com.sun.enterprise.web.WebPipeline.invoke(WebPipeline.java:97)	at com.sun.enterprise.web.PESessionLockingStandardPipeline.invoke(PESessionLockingStandardPipeline.java:85)	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:185)	at org.apache.catalina.connector.CoyoteAdapter.doService(CoyoteAdapter.java:325)	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:226)	at com.sun.enterprise.v3.services.impl.ContainerMapper.service(ContainerMapper.java:165)	at com.sun.grizzly.http.ProcessorTask.invokeAdapter(ProcessorTask.java:791)	at com.sun.grizzly.http.ProcessorTask.doProcess(ProcessorTask.java:693)	at com.sun.grizzly.http.ProcessorTask.process(ProcessorTask.java:954)	at com.sun.grizzly.http.DefaultProtocolFilter.execute(DefaultProtocolFilter.java:170)	at com.sun.grizzly.DefaultProtocolChain.executeProtocolFilter(DefaultProtocolChain.java:135)	at com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:102)	at com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:88)	at com.sun.grizzly.http.HttpProtocolChain.execute(HttpProtocolChain.java:76)	at com.sun.grizzly.ProtocolChainContextTask.doCall(ProtocolChainContextTask.java:53)	at com.sun.grizzly.SelectionKeyContextTask.call(SelectionKeyContextTask.java:57)	at com.sun.grizzly.ContextTask.run(ContextTask.java:69)	at com.sun.grizzly.util.AbstractThreadPool$Worker.doWork(AbstractThreadPool.java:330)	at com.sun.grizzly.util.AbstractThreadPool$Worker.run(AbstractThreadPool.java:309)