Spring Boot Interviews: Under the Hood

Spring Boot's greatest strength is how much it hides from you. That's also exactly what interviewers ask about.

Anyone can add @Transactional. The question that separates candidates is why it silently does nothing when you call the method from inside the same class — and there are a dozen more like it.

This handbook covers 408 questions across 31 chapters: auto-configuration internals, IoC and the bean lifecycle, Spring MVC and REST, JPA, transactions and the N+1 problem, AOP, caching, async and scheduling, security, Actuator and monitoring, and resilience patterns.

Every topic gives you the speakable answer, the mechanism underneath, a plain-English analogy, the trap that catches people, and where it bites in production.

Includes 64 production scenarios and a 15-question debugging playbook — for the round where they stop asking definitions and start describing outages.

77 pages. No magic left unexplained.