Concurrency Control In REST API With Spring Framework

In modern software systems, it is not uncommon to have hundreds or thousands of users independently and concurrently interacting with our resources. We generally want to avoid situations when changes made by one client are overridden by another one without even knowing. In order to prevent our data integrity from being violated we often use locking mechanisms provided by our database engine, or even use abstractions provided by tools like JPA.

Have you ever wondered how concurrency control should be reflected in our API? What happens when two users update the same record at the same time? Will we send any error message? What HTTP response code will we use? What HTTP headers will we attach?

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