Row was updated or deleted by another transaction (or unsaved-value mapping was incorrect)

Question

I have a java project that runs on a webserver. I always hit this exception.

I read some documentation, and found that pessimistic locking (or optimistic, but I read

Answer 1

I also ran into this error when attempting to update an existing row after creating a new one, and spent ages scratching my head, digging through transaction and version logic, until I realised that I had used the wrong type for one of my primary key columns.

I used LocalDate when I should have been using LocalDateTime – I think this was causing hibernate to not be able to distinguish entities, leading to this error.

After changing the key to be a LocalDateTime, the error went away. Also, updating individual rows began to work as well – previously it would fail to find a row for updating, and testing this separate issue was actually what led me to my conclusions regarding the primary key mapping.