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java.lang.NullPointerException: 	at weblogic.servlet.internal.session.ReplicatedSessionContext.invalidateSession(ReplicatedSessionContext.java:257)	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)	at weblogic.time.common.internal.ScheduledTrigger.execute(ScheduledTrigger.java:216)	at weblogic.time.server.ScheduledTrigger.execute(ScheduledTrigger.java:65)	at weblogic.kernel.ExecuteThread.execute(ExecuteThread.java:137)	at weblogic.kernel.ExecuteThread.run(ExecuteThread.java:120)