annotated @Version Entity can't set @ContentId、@MimeType、@OriginalFileName automatically

[lmtoo]

hi，I have a bug to report.
ContentEntityRestController's handleMultipart first find domainObj from JpaRepository，
and then set @ContentID、@MimeType、@originalFilename value to the domainObj,
and then check domainObj whether annotated @Version,if so find domainObj from JpaRepository again , but the domainObj changed ,don't have these value anymore , it seems persistence context changed.

[paulcwarren]

Hi lmtoo,

Thanks for raising this issue.

I agree this code looks a little weird.

If I recall this is because ContentStore.setContent should return the entity but doesn't. This is a problem when @Version is applied to the entity. Hibernate will update it during save/persist and return the updated entity with the updated version field that setContent drops on the floor. If we dont re-fetch the entity then the subsequent save fails. I believe this works though because the re-fetch just grabs the (updated) entity out of its cache, rather than going back to the database. But, I could be wrong.

Is this failing for you? i.e. you are seeing the contentid, mime-type and original filename fields revert? Also what Spring Boot stack are you on? 2.1, or 2.2?