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java.lang.NullPointerException: null	at com.ibm.ws.webcontainer.srt.SRTServletRequest$SRTServletRequestHelper.access$200(SRTServletRequest.java:3211)	at com.ibm.ws.webcontainer.srt.SRTServletRequest.removeAttribute(SRTServletRequest.java:829)	at org.atmosphere.cpr.AtmosphereRequestImpl.removeAttribute(AtmosphereRequestImpl.java:659)	at org.atmosphere.container.Servlet30CometSupport.endAsyncContext(Servlet30CometSupport.java:136)	at org.atmosphere.container.Servlet30CometSupport.complete(Servlet30CometSupport.java:119)	at org.atmosphere.container.Servlet30CometSupport.complete(Servlet30CometSupport.java:46)	at org.atmosphere.cpr.AtmosphereResourceImpl.cancel(AtmosphereResourceImpl.java:806)	at org.atmosphere.cpr.AtmosphereResourceImpl.dirtyClose(AtmosphereResourceImpl.java:910)	at org.atmosphere.cpr.DefaultBroadcaster.addAtmosphereResource(DefaultBroadcaster.java:1370)	at org.atmosphere.cpr.AtmosphereResourceImpl.suspend(AtmosphereResourceImpl.java:401)	at org.atmosphere.interceptor.AtmosphereResourceLifecycleInterceptor.postInspect(AtmosphereResourceLifecycleInterceptor.java:145)	at org.atmosphere.cpr.AsynchronousProcessor.postInterceptors(AsynchronousProcessor.java:374)	at org.atmosphere.cpr.AsynchronousProcessor.action(AsynchronousProcessor.java:230)	at org.atmosphere.cpr.AsynchronousProcessor.suspended(AsynchronousProcessor.java:115)	at org.atmosphere.container.Servlet30CometSupport.service(Servlet30CometSupport.java:68)	at org.atmosphere.cpr.AtmosphereFramework.doCometSupport(AtmosphereFramework.java:2287)	at org.atmosphere.cpr.AtmosphereServlet.doPost(AtmosphereServlet.java:191)	at org.atmosphere.cpr.AtmosphereServlet.doGet(AtmosphereServlet.java:177)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:575)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:668)