Resolving Concurrency Conflicts in Java REST APIs: A Case of 412 Precondition Failed


 

Resolving Concurrency Conflicts in Java REST APIs: A Case of 412 Precondition Failed

 

While developing a Java REST API, we encountered a perplexing issue:

two deployed endpoints were returning unexpected results.
The first endpoint called operated correctly, while the second returned a 412 Precondition Failed error. This behavior was consistent regardless of the calling order of the endpoints.
Upon investigation, we discovered that the issue was related to concurrency management and the ETags returned by our API.
By refining the entity version comparison logic, focusing on specific attributes such as the ID or other relevant fields, we resolved this conflict and ensured the smooth operation of our endpoints.
While this was the solution to our particular issue, it’s important to remember that similar symptoms can stem from different underlying problems. However, if you’re facing a similar challenge, it’s worth taking a closer look at the concurrency mechanisms within your API—it might just be the clue you need.

 

 

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