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java.lang.NullPointerException: 	at com.sun.faces.context.flash.ELFlash.doLastPhaseActions(ELFlash.java:607)	at com.sun.faces.context.ExternalContextImpl.responseFlushBuffer(ExternalContextImpl.java:899)	at com.sun.faces.application.view.JspViewHandlingStrategy.buildView(JspViewHandlingStrategy.java:154)	at com.sun.faces.lifecycle.RenderResponsePhase.execute(RenderResponsePhase.java:99)	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:594)	at org.apache.catalina.core.StandardWrapper.service(StandardWrapper.java:1542)	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:281)	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)	at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:655)	at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:595)	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:161)	at org.apache.catalina.connector.CoyoteAdapter.doService(CoyoteAdapter.java:331)	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:231)	at com.sun.enterprise.v3.services.impl.ContainerMapper.service(ContainerMapper.java:174)	at com.sun.grizzly.http.ProcessorTask.invokeAdapter(ProcessorTask.java:849)	at com.sun.grizzly.arp.DefaultAsyncExecutor.execute(DefaultAsyncExecutor.java:159)	at com.sun.grizzly.arp.DefaultAsyncExecutor.interrupt(DefaultAsyncExecutor.java:145)	at com.sun.grizzly.arp.AsyncProcessorTask.doTask(AsyncProcessorTask.java:102)	at com.sun.grizzly.http.TaskBase.run(TaskBase.java:193)	at com.sun.grizzly.http.TaskBase.execute(TaskBase.java:175)	at com.sun.grizzly.arp.DefaultAsyncHandler.handle(DefaultAsyncHandler.java:145)	at com.sun.grizzly.arp.AsyncProtocolFilter.execute(AsyncProtocolFilter.java:210)	at com.sun.grizzly.DefaultProtocolChain.executeProtocolFilter(DefaultProtocolChain.java:137)	at com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:104)	at com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:90)	at com.sun.grizzly.http.HttpProtocolChain.execute(HttpProtocolChain.java:79)	at com.sun.grizzly.ProtocolChainContextTask.doCall(ProtocolChainContextTask.java:54)	at com.sun.grizzly.SelectionKeyContextTask.call(SelectionKeyContextTask.java:59)	at com.sun.grizzly.ContextTask.run(ContextTask.java:71)	at com.sun.grizzly.util.AbstractThreadPool$Worker.doWork(AbstractThreadPool.java:532)	at com.sun.grizzly.util.AbstractThreadPool$Worker.run(AbstractThreadPool.java:513)	at java.lang.Thread.run(Thread.java:722)