Issue with One-to-Many and @HandleBeforeSave method [DATAREST-648]

Andrei Smolkin opened DATAREST-648 and commented

We have One-to-Many relation (entity1 -> entity2) and a @HandleBeforeSave method where we update another entity using the JPA repository, the event is initiated by the HTTP PUT call. When we do so ( entity3Repository.save(entity3)) Hibernate flash event is happening and we are getting the following exception: "javax.persistence.EntityExistsException: A different object with the same identifier value was already associated with the session" related to the entity2. There is no any relation between entity3 and entity1, entity2.

Everything is working fine with 'org.springframework.data:spring-data-rest-webmvc:2.2.1.RELEASE' and we start experiencing the issue described above with any of the future releases including the very recent snapshot 'org.springframework.data:spring-data-rest-webmvc:2.4.0.BUILD-SNAPSHOT'.

If as a workaround we make a call to entityManager.merge(entity1) inside the @HandleBeforeSave handler (before the repository save() call) then it solves the issue.

Affects: 2.2.3 (Evans SR3), 2.3.2 (Fowler SR2), 2.4 RC1 (Gosling)

Attachments:

• spring_rest_648.zip (15.05 kB)