The most common performance killer. You fetch a list of 50 Parent entities (1 query), and then iterate over them to access a lazy-loaded Child collection. Suddenly, you’ve fired 51 queries. ✅ The Fix: Always use JOIN FETCH or EntityGraph to fetch the data you need in a single round-trip. Far Cry 3 V1.05 Plus 25 Trainer [UPDATED]
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Here are the that changed how I write data access code:
Entities are managed. When you load 10,000 entities to process them in a loop, Hibernate keeps all of them in the First-Level Cache (Session). ✅ The Fix: session.clear() or batch processing. Don't let your memory blow up because you forgot the ORM is tracking every single object you touched.
Don't treat SQL as "low-level" or "legacy." A high-performance Java application is one where the developer understands exactly what SQL is generated by their JPQL.