Oracle SQL query fails only in one process: “ORA-01405: fetched column value is NULL?

This error comes from old OCI & prec-compiled code where an indicator variable was required to be set to indicate a null return for the field. When there is no indicator variable declared, this error is triggered if a null value is encountered. Obviously, some older code is still layered under the calls you made.

It turns out that my target application was executing my plugin code while in Distributed XA Transaction (MSDTC in my case). The call to DBMS_AQADM. START_QUEUE has an implicit COMMIT; that I wasn't aware of.

The error message is obviously not helpful at all in this case.

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