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    Thrown when an application is trying to use or access an object whose reference equals to null. You are probably trying to use a reference that points to no location in memory as though it were referencing an object.

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java.lang.NullPointerException: 	at java.util.Hashtable.put(Hashtable.java:380)	at weblogic.servlet.internal.session.ClusteredSessionContextImpl.getJdbcProps(ClusteredSessionContextImpl.java:138)	at weblogic.servlet.internal.session.ClusteredSessionContextImpl.getIdsInternal(ClusteredSessionContextImpl.java:38)	at weblogic.servlet.internal.session.SessionContext$SessionInvalidator.invalidateSessions(SessionContext.java:253)	at weblogic.servlet.internal.session.SessionContext$SessionInvalidator.trigger(SessionContext.java:241)	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)