[hibernate-issues] [JIRA] (HHH-14008) "Shared reference" exception thrown due to issue with batch fetching detaching locked entities in batch fetch

[Caspian Borison (JIRA)]

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

Hibernate ORM ( https://hibernate.atlassian.net/browse/HHH?atlOrigin=eyJpIjoiZDMzZDM0YTUyNTczNDBmMmJhNjcxZjM2MzlmNWVkNjMiLCJwIjoiaiJ9 ) / Bug ( https://hibernate.atlassian.net/browse/HHH-14008?atlOrigin=eyJpIjoiZDMzZDM0YTUyNTczNDBmMmJhNjcxZjM2MzlmNWVkNjMiLCJwIjoiaiJ9 ) HHH-14008 ( https://hibernate.atlassian.net/browse/HHH-14008?atlOrigin=eyJpIjoiZDMzZDM0YTUyNTczNDBmMmJhNjcxZjM2MzlmNWVkNjMiLCJwIjoiaiJ9 ) "Shared reference" exception thrown due to issue with batch fetching detaching locked entities in batch fetch ( https://hibernate.atlassian.net/browse/HHH-14008?atlOrigin=eyJpIjoiZDMzZDM0YTUyNTczNDBmMmJhNjcxZjM2MzlmNWVkNjMiLCJwIjoiaiJ9 )

Issue Type: Bug Affects Versions: 5.3.17, 5.4.15 Assignee: Unassigned Components: hibernate-core Created: 08/May/2020 22:35 PM Priority: Major Reporter: 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)

* * 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

Note I believe this issue is also related to HHH-12268 ( https://hibernate.atlassian.net/browse/HHH-12268 ) Open which still also exists in the latest 5.x versions.

( https://hibernate.atlassian.net/browse/HHH-14008#add-comment?atlOrigin=eyJpIjoiZDMzZDM0YTUyNTczNDBmMmJhNjcxZjM2MzlmNWVkNjMiLCJwIjoiaiJ9 ) Add Comment ( https://hibernate.atlassian.net/browse/HHH-14008#add-comment?atlOrigin=eyJpIjoiZDMzZDM0YTUyNTczNDBmMmJhNjcxZjM2MzlmNWVkNjMiLCJwIjoiaiJ9 )

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