Top 30 Spring Boot Interview Questions Asked in TCS and Infosys — With Answers (2025)

I work in government tech in Bhubaneswar and have spent years writing Java backend systems. When my colleagues started preparing for TCS and Infosys interviews, I noticed they were reading 50-page PDFs for answers that should take 3 sentences. So I wrote this — 30 real Spring Boot questions with short, honest answers. No padding. No theory lectures. Just what you actually need. Table of contents What is Spring Boot and how is it different from Spring Framework? What is the purpose of @SpringBootApplication annotation? What is Auto-Configuration in Spring Boot? What is the difference between @Component, @Service, @Repository and @Controller? What is Dependency Injection and how does Spring Boot implement it? What is the difference between @RestController and @Controller? What are Spring Boot Starters? What is application.properties and what is it used for? What is the difference between @GetMapping, @PostMapping, @PutMapping and @DeleteMapping? How does Spring Boot connect to a database