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 was also receiving such an exception, but the problem was in my Entity identifier. I am using UUID and there are some problems in the way Spring works with them. So I just added this line to my entity identifier and it began working:

@Column(columnDefinition = "BINARY(16)")

Here you can find a little bit more information.