[hibernate-issues] [JIRA] (HHH-14054) Hibernate insert/update ordering wrt unique constraints

[Koen Serneels (JIRA)]

Koen Serneels ( https://hibernate.atlassian.net/secure/ViewProfile.jspa?accountId=557058%3A956c77bd-dde9-4e6d-aafd-30082b747b74 ) *created* an issue

Hibernate ORM ( https://hibernate.atlassian.net/browse/HHH?atlOrigin=eyJpIjoiYjhjYzllNTRmMmE3NGM4ZGIwYmM1YjU0NmU1YzdiY2YiLCJwIjoiaiJ9 ) / Bug ( https://hibernate.atlassian.net/browse/HHH-14054?atlOrigin=eyJpIjoiYjhjYzllNTRmMmE3NGM4ZGIwYmM1YjU0NmU1YzdiY2YiLCJwIjoiaiJ9 ) HHH-14054 ( https://hibernate.atlassian.net/browse/HHH-14054?atlOrigin=eyJpIjoiYjhjYzllNTRmMmE3NGM4ZGIwYmM1YjU0NmU1YzdiY2YiLCJwIjoiaiJ9 ) Hibernate insert/update ordering wrt unique constraints ( https://hibernate.atlassian.net/browse/HHH-14054?atlOrigin=eyJpIjoiYjhjYzllNTRmMmE3NGM4ZGIwYmM1YjU0NmU1YzdiY2YiLCJwIjoiaiJ9 )

Issue Type: Bug Affects Versions: 5.4.17 Assignee: Unassigned Components: hibernate-core Created: 02/Jun/2020 00:05 AM Priority: Major Reporter: Koen Serneels ( https://hibernate.atlassian.net/secure/ViewProfile.jspa?accountId=557058%3A956c77bd-dde9-4e6d-aafd-30082b747b74 )

Hi. In the example created for this question (please see: https://github.com/koen-serneels/hibernate-uc-violation ) is an entity with a single property ‘value’ and unique constraint. Initially there is an existing instance with it’s property ‘value’ equal to ‘val1’. When we now do following within the same transaction:

* change the value on the existing entity from “val1” to “val2”
* add a new entity with “val1”

We get a ConstraintViolationException because Hibernate is executing the insert before the update. Two questions about this behavior

* Is this actually expected knowing that Hibernate knows about the unique constraint and that it would make more sense to perform the insert after the update?
* Is there a more elegant way to deal with this than performing manual flushes as illustrated by the test
case?

Btw; I posted this first on the forum ( https://discourse.hibernate.org/t/hibernate-insert-update-ordering-wrt-unique-constraints/4201 , but in absence of any response I started thinking this might be a bug. Thanks!

( https://hibernate.atlassian.net/browse/HHH-14054#add-comment?atlOrigin=eyJpIjoiYjhjYzllNTRmMmE3NGM4ZGIwYmM1YjU0NmU1YzdiY2YiLCJwIjoiaiJ9 ) Add Comment ( https://hibernate.atlassian.net/browse/HHH-14054#add-comment?atlOrigin=eyJpIjoiYjhjYzllNTRmMmE3NGM4ZGIwYmM1YjU0NmU1YzdiY2YiLCJwIjoiaiJ9 )

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