easyfundamentalsWhat is Spring Boot?What is Spring Boot and how does it differ from the Spring Framework?▾
easyiocdifundamentalsIoC Container & Dependency InjectionWhat is the Spring IoC container and how does dependency injection work?▾
easyannotationscomponent-scan@Component, @Service, @Repository, @ControllerWhat is the difference between @Component, @Service, @Repository, and @Controller?▾
easyannotationsauto-configuration@SpringBootApplicationWhat does @SpringBootApplication do and what three annotations does it combine?▾
easyconfigurationapplication.properties vs application.ymlHow do you configure a Spring Boot application and what is the difference between application.properties and application.yml?▾
easyactuatormonitoringSpring Boot ActuatorWhat is Spring Boot Actuator and what endpoints does it expose?▾
mediumauto-configurationinternalsAuto-Configuration MechanismHow does Spring Boot auto-configuration work internally?▾
mediumbean-lifecycleinternalsBean LifecycleWhat is the Spring bean lifecycle and how can you hook into it?▾
mediumspring-mvcrequest-handlingSpring MVC Request HandlingHow does Spring MVC handle an incoming HTTP request from start to finish?▾
mediumannotationsspring-mvcrest@RestController vs @ControllerWhat is the difference between @RestController and @Controller, and when do you use each?▾
mediumexception-handlingspring-mvcException Handling with @ControllerAdviceHow do you implement global exception handling in Spring Boot with @ControllerAdvice?▾
mediumbean-scopesinternalsBean ScopesWhat are the different bean scopes in Spring and when do you use each?▾
mediumjpadata-accessspring-dataSpring Data JPAHow does Spring Data JPA simplify database access and what are derived query methods?▾
mediumsecurityauthenticationauthorizationSpring Security BasicsHow does Spring Security work and how do you configure basic authentication and authorization?▾
mediumconfigurationtype-safety@ConfigurationPropertiesHow do you bind configuration to a type-safe object with @ConfigurationProperties?▾
mediumhttp-clientrest-templateweb-clientRestTemplate vs WebClientWhat is the difference between RestTemplate and WebClient in Spring Boot, and when should you use each?▾
hardjwtsecurityauthenticationJWT Integration with Spring SecurityHow do you implement stateless JWT authentication in Spring Boot?▾
hardtestingspring-boot-testweb-mvc-testdata-jpa-testTesting with @SpringBootTestWhat are @SpringBootTest, @WebMvcTest, and @DataJpaTest and when do you use each?▾
hardvirtual-threadsspring-boot-3performanceproject-loomSpring Boot 3 — Virtual ThreadsHow do virtual threads (Project Loom) integrate with Spring Boot 3 and what are the benefits?▾
hardnative-imagegraalvmspring-boot-3aotSpring Boot 3 — Native Image (GraalVM)What is GraalVM Native Image support in Spring Boot 3 and what are the trade-offs?▾
hardtransactionsjpadatabaseTransaction ManagementHow does @Transactional work in Spring and what are the propagation and isolation levels?▾
hardcachingredisperformanceSpring Cache AbstractionHow does Spring's caching abstraction work and how do you integrate Redis as a cache backend?▾
hardeventsasyncdecouplingSpring Application Events & @AsyncHow do Spring application events and @Async work, and what are their pitfalls?▾
hardobservabilitymicrometertracingloggingspring-boot-3Observability — Micrometer, Tracing & LoggingHow do you implement observability (metrics, tracing, structured logging) in Spring Boot 3?▾