In Java world, Hibernate/JPA is the most popular ORM framework.
Also, JPA/Hibernate is a very controversial topic
because some people don’t like it at all.
It is very understandable though.
Many people start using JPA/Hibernate with minimal knowledge and keep adding logic (read as “annotations”) as and when required to get the job done.
While checking the overall application performance, most of the time people realize it’s because of poor performance of persistence layer.

Test

Hypersistence Optimizer is a commercial tool by Vlad Mihalcea that profiles JPA/Hibernate code and reports performance issues with explanations and fix guidance. The post walks through integrating it into a Spring Boot application via Gradle/Maven, configuring it as a Spring bean in test scope, and writing tests that fail when the optimizer detects issues. A concrete example shows how using EnumType.STRING triggers a MAJOR warning. The author endorses buying a license for JPA-heavy applications, arguing it accelerates both bug fixing and deeper JPA mastery.

Improve JPA application performance using HypersistenceOptimizer