[hibernate-issues] [JIRA] (HHH-14008) "Found shared references to collection" exception thrown due to issue with batch fetching duplicating locked entities on refresh

[Caspian Borison (JIRA)]

Caspian Borison ( https://hibernate.atlassian.net/secure/ViewProfile.jspa?accountId=557058%3Abead8085-c796-4d7d-9fa0-0ec2008c7f92 ) *updated* an issue

Hibernate ORM ( https://hibernate.atlassian.net/browse/HHH?atlOrigin=eyJpIjoiYzUyZGFmZjE0NWQ0NGE5ZWFjZDk5YThkYjAwZWM2MzMiLCJwIjoiaiJ9 ) / Bug ( https://hibernate.atlassian.net/browse/HHH-14008?atlOrigin=eyJpIjoiYzUyZGFmZjE0NWQ0NGE5ZWFjZDk5YThkYjAwZWM2MzMiLCJwIjoiaiJ9 ) HHH-14008 ( https://hibernate.atlassian.net/browse/HHH-14008?atlOrigin=eyJpIjoiYzUyZGFmZjE0NWQ0NGE5ZWFjZDk5YThkYjAwZWM2MzMiLCJwIjoiaiJ9 ) "Found shared references to collection" exception thrown due to issue with batch fetching duplicating locked entities on refresh ( https://hibernate.atlassian.net/browse/HHH-14008?atlOrigin=eyJpIjoiYzUyZGFmZjE0NWQ0NGE5ZWFjZDk5YThkYjAwZWM2MzMiLCJwIjoiaiJ9 )

Change By: Caspian Borison ( https://hibernate.atlassian.net/secure/ViewProfile.jspa?accountId=557058%3Abead8085-c796-4d7d-9fa0-0ec2008c7f92 )

Hibernate seems to have an issue under the following scenario with the following simple mappings ( all lazy assuming these mappings ) :

* Parent -> OneToMany -> Child
* Child -> ManyToOne -> Parent

# Enable batch fetching
# Read in Parent1 and a (non-related) Child
# Lock and refresh the original Parent1 / this will prompt a batch fetch of the other child's ParentX
## At this time, it appears the original Parent1 is "duplicated" in the session cache
# Directly read in a Child associated with Parent1
# Refresh the original reference to Parent1 causing Hibernate to now directly see two Parent1s in the cache
# Flush the session

Test cases have been attached and can also be retrieved from GitHub:  [https://github.com/caspianb/HibernateRefreshTest/tree/HHH-14008|https://github.com/caspianb/HibernateRefreshTest/tree/HHH-14008|smart-link]

Note I believe this issue is also related to:
[HHH-12268] (which still exists in the latest 5.x versions).

( https://hibernate.atlassian.net/browse/HHH-14008#add-comment?atlOrigin=eyJpIjoiYzUyZGFmZjE0NWQ0NGE5ZWFjZDk5YThkYjAwZWM2MzMiLCJwIjoiaiJ9 ) Add Comment ( https://hibernate.atlassian.net/browse/HHH-14008#add-comment?atlOrigin=eyJpIjoiYzUyZGFmZjE0NWQ0NGE5ZWFjZDk5YThkYjAwZWM2MzMiLCJwIjoiaiJ9 )

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