https://github.com/DSpace/DSpace/blob/dspace-4.2/dspace-oai/src/main/java/org/dspace/xoai/app/XOAI.java#L275
The problem is that the item you're indexing has a submitter with
empty email field. You need to find out which item it is and correct
the submitter's email.
Run the import again and in another terminal run:
tail -f /dspace/log/solr.log
You'll see lines like this one. The last one you'll see (e.g.
123456789/2611) will be the one with the problem:
org.apache.solr.update.processor.LogUpdateProcessor @ [oai]
webapp=/solr path=/update params={wt=javabin&version=2}
{add=[123456789/2611 (1493435116024758272)]} 0 2
If you have multiple submitters without an email, you'll need to
repeat the process.
Regards,
~~helix84
Compulsory reading: DSpace Mailing List Etiquette
https://wiki.duraspace.org/display/DSPACE/Mailing+List+Etiquette
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