Concurrency issue with JPA Lists [DATAREST-895]

Laurent Bovet opened DATAREST-895 and commented

I have a OneToMany association with a JoinTable:
https://github.com/lbovet/bugtik/blob/jointable-concurrency-issue/src/main/java/li/chee/bugtik/Project.java#L20

When creating associations in parallel (POST URIs to the collection resource concurrently), There is a race condition where the previous collection content overwrites a more recent one. This results in not all the associations created.

Note that if I model the association with a JoinColumn, the problem does not arises:
https://github.com/lbovet/bugtik/blob/joincolumn-concurrency-ok/src/main/java/li/chee/bugtik/Project.java#L20

I think it is a bug that Spring Data Rest operations are not performed atomically in the JoinTable case. If not, is there a configurative way to solve this?

You can checkout the sample project (https://github.com/lbovet/bugtik.git) and try both branches:
mvn spring-boot:run
http://localhost:8080/concurrency-test.html

Affects: 2.4.4 (Gosling SR4), 2.5.2 (Hopper SR2)

Reference URL: https://github.com/lbovet/spring-data-rest/tree/issue/DATAREST-895