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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.ClusteredSessionContextImpl.getJdbcProps( at weblogic.servlet.internal.session.ClusteredSessionContextImpl.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