Java Jpa Hibernate

This one walks you through JPA and Hibernate for production Java apps, covering entity relationships, query optimization, and the dreaded N+1 problem. You get practical examples on JOIN FETCH versus EntityGraph, batch fetching strategies, transaction management, and caching configuration. The quick reference shows real entity mapping patterns and repository queries that actually prevent lazy loading issues. If you're debugging LazyInitializationExceptions or wondering why your API makes 500 database calls per request, the troubleshooting section breaks down the usual suspects. It assumes you know Spring Boot basics but need to stop your persistence layer from tanking performance.