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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:401)	at oracle.apps.ad.clone.util.CloneCleanser.doMigrate(CloneCleanser.java:98)	at oracle.apps.ad.context.CloneContext.doClone(CloneContext.java:718)	at oracle.apps.ad.context.CloneContext.main(CloneContext.java:5260)