OIC - Resolved - Stage read file in segements - XML-22031 : Error variable not defined.

Scenario:

This is a strange error. I have a orchestrated integration which performs the following:

• First list the files from s3 directory using sftp
• Then for each file, it downloads the file and  reads the file reference using stage read in segments. 
• In the read in segement, we are wrting the line records in the required erp comma separated format. 
• The downloaded file size is ~21MB.

Observation:

During transformation, we received below error:

Xpath expression failed to execute.

The reason was javax.xml.transform.TransformerException. 

XML-22031 : (Error) Variable not defines for "currFileRef".

Screenshot from OIC: errored in the writeLineRecord stage activity.

Solution: 

This is an Oracle bug. During mapping if any fields are blanks, then this kind of issues can occure. 

Oracle recommended to use a scope in the read file in segemets. Whintin the scope, the writeline stage and mapper will be there.

Screenshot after change:

After this small change, I have tested again with same 21MB source payload and it has magically processed without any error.