The 7-Day Interview Prep Cheatsheet
Day 5 — Spring Boot, JPA & Hibernate in one sitting
Spring Boot, JPA and Hibernate for backend interviews: dependency injection and IoC, building a REST API, entity mapping and relationships, transactions, the N+1 query problem, and lazy-loading and caching pitfalls — with frequently asked questions and exercises.
You once wrote a small web app by hand. A database connection made with new here, a fresh service object there, a controller that reaches down to build everything it needs. It worked — right up until it didn’t. Fifteen new calls deep, one shared config touched by ten files, and changing a single constructor meant a morning of edits. Then a data-heavy page that felt slow for no reason you could see. Today you and I fix all of that in one sitting. Spring Boot to assemble the app for you, JPA and Hibernate to turn objects into rows, and the two traps — lazy loading and the N+1 query — that separa…
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