response.addHeader(“Access-Control-Allow-Origin”, “*”);
response.addHeader(“Access-Control-Allow-Methods”, “GET, POST, PUT, DELETE”);
response.addHeader(“Access-Control-Allow-Headers”, “origin, content-type, accept, x-requested-with”);
response.addHeader(“Access-Control-Max-Age”, “3600”);
HttpServletResponse response = (HttpServletResponse)

So, I got this class that belongs to a external library (so I can’t modify it):

I have an entity that creates the table comments but also the table comment_unreads.

I have an entity that creates the table comments but also the table comment_unreads.

I have an entity that creates the table comments but also the table comment_unreads.

I have an entity that creates the table comments but also the table comment_unreads.

I try write some tests for my repository. For testing method “save” I get error
org.springframework.orm.ObjectOptimisticLockingFailureException: Row was updated or deleted by another transaction (or unsaved-value mapping was incorrect): [ru.clevertec.newsonline.entity.News#7289c37a-8bfa-4092-872b-f1e4a8c319c6]
Other methods pass tests.
Why did I get it?

I have an interface that first retrieves data from a third-party API, and then returns JSON to the front end for display.

I have this in my application.yml:

I’m working on a Spring Boot application and I’m trying to send a response from my controller.