Spring Framework Interview Questions

title: Spring Framework Interview Questions description: Spring and Spring Boot interview questions with answers

Q1. Spring Framework kya hai?

Java enterprise development ka lightweight framework. Dependency Injection aur AOP (Aspect-Oriented Programming) provide karta hai.

Q2. Spring ke modules kya hain?

• Spring Core (IoC Container)
• Spring MVC
• Spring Data JPA
• Spring Security
• Spring Boot
• Spring Cloud

Q3. Dependency Injection kya hai?

Object apni dependencies khud create nahi karta — bahar se inject ki jaati hain. Loose coupling aata hai.

Types: Constructor Injection, Setter Injection, Field Injection

Q4. @Autowired kya karta hai?

Spring automatically matching bean inject kar deta hai.

Q5. Bean kya hai? Scope kya hota hai?

Spring IoC container manage karne wale objects beans hain. Scopes: singleton (default), prototype, request, session

Q6. Spring Boot kya hai? Spring se kaise alag hai?

• Auto-configuration
• Embedded server (Tomcat)
• Starter dependencies
• No XML configuration
• Production-ready (Actuator)

Q7. @RestController vs @Controller?

• @Controller — View return karta hai (MVC)
• @RestController — @Controller + @ResponseBody = JSON/XML return karta hai

Q8. @RequestMapping vs @GetMapping?

• @RequestMapping — Sabhi HTTP methods handle karta hai
• @GetMapping — Sirf GET, shorthand annotation

Q9. Spring Security kya hai?

Authentication aur Authorization framework. JWT, OAuth2, Basic Auth support karta hai.

Q10. JPA vs Hibernate?

• JPA — Java Persistence API, specification (interface)
• Hibernate — JPA ka implementation