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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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via Oracle Community by 47730, 2 years ago
This exception has no message.
via Oracle Community by 155772, 2 years ago
via Google Groups by Unknown author, 10 months ago
This exception has no message.
java.lang.NullPointerException at java.util.Hashtable.put( at oracle.sdoapi.sref.impl.SRManagerImpl.retrieve( at sample.SampleNewToSDO.main(