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java.lang.NullPointerException: 	at javax.faces.context.PartialResponseWriter.startDocument(PartialResponseWriter.java:119)	at org.springframework.faces.webflow.JsfAjaxHandler.sendAjaxRedirectInternal(JsfAjaxHandler.java:75)	at org.springframework.js.ajax.AbstractAjaxHandler.sendAjaxRedirect(AbstractAjaxHandler.java:31)	at org.springframework.webflow.mvc.servlet.FlowHandlerAdapter.sendFlowExecutionRedirect(FlowHandlerAdapter.java:416)	at org.springframework.webflow.mvc.servlet.FlowHandlerAdapter.handleFlowExecutionResult(FlowHandlerAdapter.java:385)	at org.springframework.webflow.mvc.servlet.FlowHandlerAdapter.handle(FlowHandlerAdapter.java:228)	at org.springframework.faces.webflow.JsfFlowHandlerAdapter.handle(JsfFlowHandlerAdapter.java:46)	at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:925)	at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:856)	at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:936)	at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:838)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:707)	at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:812)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:790)	at org.apache.catalina.core.StandardWrapper.service(StandardWrapper.java:1682)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:344)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:214)	at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:88)	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:256)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:214)	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:316)	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:160)	at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:734)	at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:673)	at com.sun.enterprise.web.WebPipeline.invoke(WebPipeline.java:99)	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:174)	at org.apache.catalina.connector.CoyoteAdapter.doService(CoyoteAdapter.java:357)	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:260)	at com.sun.enterprise.v3.services.impl.ContainerMapper.service(ContainerMapper.java:188)	at org.glassfish.grizzly.http.server.HttpHandler.runService(HttpHandler.java:191)	at org.glassfish.grizzly.http.server.HttpHandler.doHandle(HttpHandler.java:168)	at org.glassfish.grizzly.http.server.HttpServerFilter.handleRead(HttpServerFilter.java:189)	at org.glassfish.grizzly.filterchain.ExecutorResolver$9.execute(ExecutorResolver.java:119)	at org.glassfish.grizzly.filterchain.DefaultFilterChain.executeFilter(DefaultFilterChain.java:288)	at org.glassfish.grizzly.filterchain.DefaultFilterChain.executeChainPart(DefaultFilterChain.java:206)	at org.glassfish.grizzly.filterchain.DefaultFilterChain.execute(DefaultFilterChain.java:136)	at org.glassfish.grizzly.filterchain.DefaultFilterChain.process(DefaultFilterChain.java:114)	at org.glassfish.grizzly.ProcessorExecutor.execute(ProcessorExecutor.java:77)	at org.glassfish.grizzly.nio.transport.TCPNIOTransport.fireIOEvent(TCPNIOTransport.java:838)	at org.glassfish.grizzly.strategies.AbstractIOStrategy.fireIOEvent(AbstractIOStrategy.java:113)	at org.glassfish.grizzly.strategies.WorkerThreadIOStrategy.run0(WorkerThreadIOStrategy.java:115)	at org.glassfish.grizzly.strategies.WorkerThreadIOStrategy.access$100(WorkerThreadIOStrategy.java:55)	at org.glassfish.grizzly.strategies.WorkerThreadIOStrategy$WorkerThreadRunnable.run(WorkerThreadIOStrategy.java:135)	at org.glassfish.grizzly.threadpool.AbstractThreadPool$Worker.doWork(AbstractThreadPool.java:564)	at org.glassfish.grizzly.threadpool.AbstractThreadPool$Worker.run(AbstractThreadPool.java:544)	at java.lang.Thread.run(Thread.java:724)