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java.lang.NullPointerException at java.util.Hashtable.get(Hashtable.java:320) at weblogic.servlet.internal.HttpServer.unregister(HttpServer.java:605) at weblogic.servlet.internal.session.ReplicatedSessionData.invalidate(ReplicatedSessionData.java:276) at weblogic.servlet.internal.session.ReplicatedSessionContext.invalidateSession(ReplicatedSessionContext.java:277) at weblogic.servlet.internal.session.SessionContext$SessionInvalidator.invalidateSessions(SessionContext.java:274) at weblogic.servlet.internal.session.SessionContext$SessionInvalidator.trigger(SessionContext.java:245) at weblogic.time.common.internal.ScheduledTrigger.executeLocally(ScheduledTrigger.java:225)