Spring Mongo: how to organize a parallel change of an entity?

Question

Java

Hello! Newbie in java.
I use Spring + Spring Mongo. There is an essence. Requests to change it come from clients. Multiple requests may arrive at the same time. Now, when requesting, I select an entity from the database, change it, save it. But, it is clear that with simultaneous requests, I can wipe out some of the changes.
How to avoid it? How are such problems solved?
Thanks in advance!

Answer 1

The easiest way is to use syncronized. In general, Monga uses a lock on the document internally during change operations, so you should not bother.

Answer 2

If the problem does not manifest itself, or it rarely appears, and the cost of such a problem is small, then there is no point in solving it. Otherwise, you can at least try using optimistic locks , and ideally consider using Event Sourcing.