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java.lang.NullPointerException: 	at java.io.Writer.write(Writer.java:140)	at com.sun.faces.context.AjaxExceptionHandlerImpl.handlePartialResponseError(AjaxExceptionHandlerImpl.java:200)	at com.sun.faces.context.AjaxExceptionHandlerImpl.handle(AjaxExceptionHandlerImpl.java:119)	at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:119)	at com.sun.faces.lifecycle.RestoreViewPhase.doPhase(RestoreViewPhase.java:110)	at com.sun.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:118)	at javax.faces.webapp.FacesServlet.service(FacesServlet.java:312)	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:332)	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:233)	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)	at java.lang.Thread.run(Thread.java:619)