Trace one GET /orders/{id} through Spring Boot as you would on a Flipkart-style loop: filter, controller, transaction, SQL, JSON.
PICTURE THIS: DATABASE INDEX
Simple meaning
The request hits the servlet container, Spring Security filters authenticate, DispatcherServlet maps to the @RestController method, and the service runs inside a @Transactional boundary that borrows a Hikari connection.
WHY — Spring Boot instead of guessing?
Why interviewers care about Spring Boot:
people who only read docs from people who shipped.
and tied to Backend work.
Name the idea, why it exists, then one short example.
End with when you use it and one common pitfall.
STEPS — What happens step by step?
Before you speak the answer, walk the interviewer through these steps:
- 1The request hits the
servlet container, Spring Security filters authenticate, DispatcherServlet maps to the @RestController method, and the service runs inside a @Transactional boundary that borrows a Hikari connection.
- 2JPA loads the entity,
you map a DTO, the transaction commits, Jackson writes JSON, and filters complete the response.
- 3Call out lazy loads,
connection hold time, and status mapping if you want the senior bar.
- 4Give an example
One tiny concrete case you can say aloud.
- 5Common mistake
What juniors usually get wrong.
- 6Close
When you pick this over the alternative.
EXAMPLE — See it in action
Here's a short line you can speak, broken into clear beats:
Note: Adapt this scaffold to your own project — keep it under 60–90 seconds.
Key takeaway
The request hits the servlet container, Spring Security filters authenticate, DispatcherServlet maps to the @RestController method, and the service runs inside a @Transactional boundary that borrows a Hikari connection. JPA loads the entity, you map a DTO, the transaction commits, Jackson writes JSON, and filters complete the response.