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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(	at weblogic.servlet.internal.session.JDBCSessionContext.getJdbcProps(	at weblogic.servlet.internal.session.JDBCSessionContext.getIdsInternal(	at weblogic.servlet.internal.session.SessionContext$SessionInvalidator.invalidateSessions(	at weblogic.servlet.internal.session.SessionContext$SessionInvalidator.trigger(	at weblogic.time.common.internal.ScheduledTrigger.executeLocally(	at weblogic.time.common.internal.ScheduledTrigger.execute(	at weblogic.time.server.ScheduledTrigger.execute(	at weblogic.kernel.ExecuteThread.execute(	at