Spring Boot Quiz (Intermediate) - All Questions

This intermediate Spring Boot quiz focuses on applied concepts like auto-configuration, REST APIs, data access, validation, and real-world usage. Ideal for developers who know the basics and want to prepare for Spring Boot interviews and production applications.

Question 1: What is the main advantage of Spring Boot over Spring Framework?

Better UI support
Auto-configuration and reduced boilerplate
Faster JVM execution
Built-in database

Explanation: Spring Boot reduces boilerplate using auto-configuration.

Question 2: Which annotation combines @Configuration, @EnableAutoConfiguration, and @ComponentScan?

@SpringApplication
@EnableBoot
@SpringBootApplication
@BootConfiguration

Explanation: @SpringBootApplication combines these three annotations.

Question 3: How does Spring Boot decide which beans to auto-configure?

Based on XML files
Based on classpath dependencies
Based on server type
Based on OS

Explanation: Auto-configuration depends on classpath dependencies.

Question 4: Which file can be used instead of application.properties for hierarchical configuration?

config.json
application.yml
spring.xml
settings.yml

Explanation: application.yml supports hierarchical configuration.

Question 5: Which annotation is used to activate a specific Spring profile?

@Profile
@ActiveProfile
@EnableProfile
@UseProfile

Explanation: @Profile activates beans for specific environments.

Question 6: Where can you define the active Spring profile in Spring Boot?

pom.xml
application.properties
web.xml
controller class

Explanation: spring.profiles.active is defined in application.properties.

Question 7: Which dependency enables Spring Boot to work with databases using JPA?

spring-boot-starter-jdbc
spring-boot-starter-data-jpa
spring-boot-starter-web
spring-boot-starter-security

Explanation: spring-boot-starter-data-jpa provides JPA support.

Question 8: Which interface provides paging and sorting in Spring Data JPA?

CrudRepository
JpaRepository
PagingAndSortingRepository
EntityRepository

Explanation: PagingAndSortingRepository provides paging and sorting.

Question 9: What happens if no @ControllerAdvice is defined?

Application fails
Exceptions are not handled
Exceptions are handled locally
Spring disables controllers

Explanation: Exceptions are handled locally at controller level.

Question 10: Which annotation is used to return custom HTTP status codes?

@ResponseBody
@HttpStatus
@ResponseStatus
@Status

Explanation: @ResponseStatus sets custom HTTP status.

Question 11: Which HTTP method is typically used for partial updates?

PUT
PATCH
POST
GET

Explanation: PATCH is used for partial updates.

Question 12: Which annotation maps PATCH requests in Spring Boot?

@Patch
@UpdateMapping
@PatchMapping
@RequestMapping

Explanation: @PatchMapping maps PATCH requests.

Question 13: What is the purpose of CommandLineRunner?

Handle HTTP requests
Execute code at startup
Run scheduled tasks
Create REST APIs

Explanation: CommandLineRunner executes code at application startup.

Question 14: Which annotation enables caching support?

@EnableCache
@EnableCaching
@Cacheable
@CacheEnable

Explanation: @EnableCaching activates cache support.

Question 15: Which annotation stores method results in cache?

@CachePut
@CacheStore
@CacheSave
@Cacheable

Explanation: @Cacheable stores method results in cache.

Question 16: Which annotation is used to exclude auto-configuration?

@DisableAutoConfig
@ExcludeAutoConfiguration
@SpringBootApplication(exclude)
@IgnoreAutoConfig

Explanation: Auto-config can be excluded using exclude attribute.

Question 17: Which Spring Boot feature helps expose metrics and health info?

Spring AOP
Spring Actuator
Spring Security
Spring Scheduler

Explanation: Spring Actuator exposes metrics and health endpoints.

Question 18: Which actuator endpoint shows all beans?

/beans
/env
/health
/info

Explanation: /beans lists all Spring beans.

Question 19: Which annotation enables method-level validation?

@Validated
@Valid
@Check
@Verify

Explanation: @Validated enables method-level validation.

Question 20: Which annotation is required on REST controllers to validate request body?

@RequestBody
@Validated
@Valid
@ResponseBody

Explanation: @Valid triggers validation on request body.

Question 21: Which annotation enables asynchronous processing?

@Async
@EnableAsync
@EnableThread
@AsyncEnable

Explanation: @EnableAsync enables async execution.

Question 22: Which return type is recommended for async methods?

void
Future
CompletableFuture
Thread

Explanation: CompletableFuture provides better async handling.

Question 23: Which property changes the default server port?

server.url
server.port
spring.port
boot.port

Explanation: server.port changes the default port.

Question 24: Which annotation is used to inject configuration properties class?

@Value
@ConfigurationProperties
@PropertySource
@Inject

Explanation: @ConfigurationProperties binds external properties.

Question 25: Which annotation must be used with @ConfigurationProperties?

@EnableConfig
@Component
@Bean
@Service

Explanation: It must be registered as a Spring bean.

Question 26: Which annotation is used to handle CORS globally?

@CrossOrigin
@EnableCors
@ControllerAdvice
@GlobalCors

Explanation: @ControllerAdvice can be used for global CORS config.

Question 27: Which dependency provides embedded H2 database?

spring-boot-starter-jdbc
spring-boot-starter-data-jpa
com.h2database:h2
spring-boot-starter-test

Explanation: H2 dependency provides in-memory database.

Question 28: Which annotation enables scheduling tasks?

@EnableAsync
@EnableScheduling
@Scheduled
@EnableJobs

Explanation: @EnableScheduling enables scheduled execution.

Question 29: Which property enables SQL logging?

spring.jpa.show-sql
spring.sql.log
hibernate.sql
db.show.sql

Explanation: spring.jpa.show-sql logs SQL queries.

Question 30: Which annotation marks a class as a configuration class?

@Config
@Configuration
@Setup
@SpringConfig

Explanation: @Configuration marks configuration classes.

Question 31: Which HTTP status code represents no content?

Explanation: 204 means no content.

Question 32: Which annotation handles file uploads?

@FileUpload
@Multipart
@RequestPart
@Upload

Explanation: @RequestPart handles multipart file uploads.

Question 33: Which interface runs code after application startup?

Runnable
ApplicationRunner
StartupRunner
BootRunner

Explanation: ApplicationRunner runs code after startup.

Question 34: Which annotation enables transaction management?

@EnableTx
@EnableTransactionManagement
@Transactional
@Transaction

Explanation: @EnableTransactionManagement enables transactions.

Question 35: Which annotation rolls back a transaction by default?

@Rollback
@Transactional
@Transaction
@EnableTx

Explanation: @Transactional rolls back on runtime exceptions.

Question 36: Which annotation is used to secure REST endpoints?

@Secure
@PreAuthorize
@Authorize
@RestSecure

Explanation: @PreAuthorize secures methods.

Question 37: Which dependency is used for Spring Security?

spring-boot-starter-web
spring-boot-starter-auth
spring-boot-starter-security
spring-security-core

Explanation: spring-boot-starter-security provides security support.

Question 38: Which class is the entry point of a Spring Boot app?

ApplicationContext
DispatcherServlet
SpringApplication
BootStrap

Explanation: SpringApplication runs the app.

Question 39: Which annotation binds URL path values?

@RequestParam
@PathVariable
@UrlParam
@BindPath

Explanation: @PathVariable binds path values.

Question 40: Which HTTP method is idempotent?

POST
PATCH
PUT
CONNECT

Explanation: PUT is idempotent.

Question 41: Which logging facade is used by Spring Boot?

Log4j
Commons Logging
SLF4J
Jul

Explanation: Spring Boot uses SLF4J facade.

Question 42: Which annotation enables configuration property scanning?

@EnableConfigurationProperties
@ScanProperties
@PropertyScan
@EnableProps

Explanation: It enables scanning of configuration properties.

Question 43: Which actuator endpoint provides environment details?

/env
/info
/health
/metrics

Explanation: /env exposes environment properties.

Question 44: Which annotation customizes JSON serialization?

@JsonProperty
@ResponseBody
@RestController
@Serialize

Explanation: @JsonProperty customizes JSON fields.

Question 45: Which annotation handles global REST exceptions?

@ExceptionHandler
@ControllerAdvice
@RestControllerAdvice
@ErrorHandler

Explanation: @RestControllerAdvice handles global REST exceptions.

Question 46: Which HTTP status code represents bad request?

Explanation: 400 indicates bad request.

Question 47: Which annotation enables Web MVC configuration?

@EnableMVC
@EnableWebMvc
@WebMvc
@MvcEnable

Explanation: @EnableWebMvc enables MVC configuration.

Question 48: Which feature allows externalized configuration?

Spring XML
Profiles
Spring Boot properties
Java Config

Explanation: Spring Boot supports externalized configuration.

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Spring Boot Quiz (Intermediate)

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Spring Boot Quiz (Intermediate)