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Title
Error during scan [ScanServiceImpl] Encountered an exception during scan commit: org.hibernate.NonUniqueResultException: query did not return a unique result: 2

Summary

This article discusses one possible workaround for the [ScanServiceImpl] Encountered an exception during scan commit: org.hibernate.NonUniqueResultException: query did not return a unique result: 2 error during a scan

Synopsis

A project has been scanned before with no errors, but after refreshing the sources and starting a new scan it fails with the following error:

2018-05-14 20:38:53,559 ERROR [http-bio-8888-exec-8] [ScanServiceImpl] Encountered an exception during scan commit
org.hibernate.NonUniqueResultException: query did not return a unique result: 2
at org.hibernate.impl.AbstractQueryImpl.uniqueElement(AbstractQueryImpl.java:899)

Discussion

The customer created a new workspace and new project, ran an initial scan on the existing sources. They imported all the project groups from the old project into the new project and then re-ran a new scan on the new project/workspace. No errors were encountered on either scan.
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Error during scan [ScanServiceImpl] Encountered an exception during scan commit: org.hibernate.NonUniqueResultException: query did not return a unique result: 2