Assuming you're running DSpace 3, here's the offending line:
https://github.com/DSpace/DSpace/blob/dspace-3.2/dspace-xmlui/src/main/java/org/dspace/app/xmlui/cocoon/MetadataExportReader.java#L187
There are several things that could possibly be null: out, csv and
csv.toString() and csv.toString().getBytes("UTF-8"). Is it possible
you're exporting something that results in an empty CSV?
BTW index-update doesn't do anything related to CSV export. It updates
metadata in the Lucene index from database. CSV export exports
metadata from database.
Regards,
~~helix84
Compulsory reading: DSpace Mailing List Etiquette
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