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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.

Solutions on the web

via Hibernate JIRA by Janario Oliveira, 2 years ago
via Oracle Community by 821844, 1 year ago
via Oracle Community by Nayas, 2 years ago
This exception has no message.
via bigresource.com by Unknown author, 2 years ago
via Oracle Community by 61157, 2 years ago
Empty query.