In the Java world, JPA/Hibernate is the most popular and widely used framework.
When it comes to the overall performance of a software system, the database persistence layer plays a crucial role.
The tricky part with JPA/Hibernate is that it is very easy to get started but very, very hard to master.
This is where Vlad Mihalcea’s High-Performance Java Persistence book helps you a lot.

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A review of Vlad Mihalcea's 'High-Performance Java Persistence' book, which covers the Java persistence layer in depth — from JDBC internals and connection management to JPA/Hibernate mappings, caching, batch operations, lazy loading, and complex queries with jOOQ. The reviewer praises the book for going beyond surface-level annotations to explain how things work under the hood, calling it the definitive single resource for mastering Java persistence.

My Review of Vlad Mihalcea’s High-Performance Java Persistence book