NaturalIdCacheEvent is triggered even when having the @NaturalIdCache in place

[rameshsahydstgdn]

Issue Summary:

The Hypersistence Optimizer is suggesting to add the @NaturalIdCache annotation to entities that already have it, specifically when using natural identifiers. This recommendation appears even when the annotation is correctly applied at the entity level.

Steps to Reproduce:

Define an entity in Hibernate with natural identifiers (@naturalid).
Apply the @NaturalIdCache annotation to the entity class.
Run the Hypersistence Optimizer or integrate it into a Spring Boot application.
Observe the generated NaturalIdCacheEvent warning.

Expected Behavior:

The Hypersistence Optimizer should recognize that @NaturalIdCache is already present on the entity and not suggest adding it again, assuming it's correctly placed.

Actual Behavior:

The optimizer suggests adding @NaturalIdCache even when it is already used in the entity definition. This can lead to confusion and unnecessary recommendations in the optimization report.

Environment:

Hypersistence Optimizer version: 2.9.0, classifier: jakarta
Hibernate version: 6.5.2.Final
Spring Boot version: 3.3.0
Database: postgresql:16

[vladmihalcea]

Thanks for reporting it. I will try to replicate it according to your indications.

[vladmihalcea]

@rameshsahydstgdn I build this example to replicate the issue.

I assume you added the @NaturalIdCache annotation without activating the second-level cache, and that's why you got the NaturalIdCacheEvent.

If you activate the second-level cache via the spring.jpa.properties.hibernate.cache.region.factory_class property and the Maven dependency (e.g., Ehcache), then the event is no longer triggered, as proven by the test case.

So, in this case, I could change the message of the NaturalIdCache event to make it easier for devs to find out that the cache annotations themselves do nothing in the absence of the second-level cache.

[rameshsahydstgdn]

Thank you for the suggestion! Issue resolved by activating the second-level cache.

[vladmihalcea]

@rameshsahydstgdn I will reopen it in order to investigate a way to change the message based on whether the second-level cache is active or not.