Spring

Spring Framework and Spring Boot concepts for backend engineering interviews.

Topic	Key Focus
Spring Core & DI	IoC, Bean lifecycle, Scopes, ApplicationContext
Spring Boot	Auto-configuration, Starters, Actuator, Properties
Spring MVC	DispatcherServlet, Controllers, Exception handling
Spring Data JPA	Repositories, Query methods, Pagination, Projections
Spring Security	Authentication, Authorization, OAuth2, JWT
Spring Cloud	Service discovery, Config server, Circuit breaker
Spring Testing	@SpringBootTest, MockMvc, TestContainers