SpringBoot Core

What does the @SpringBootApplication annotation combine?

• @Component, @Service, @Repository

• @Configuration, @EnableAutoConfiguration, @ComponentScan

• @RestController, @RequestMapping, @EnableJpaRepositories

• @SpringBootTest, @EnableCaching, @EnableScheduling

Which annotation makes a class a candidate for auto-detection by Spring when using annotation-based configuration?

• @Autowired

• @Bean

• @Component

• @SpringBootApplication

What is the purpose of @RestController annotation in Spring Boot?

• To define a controller that returns view pages

• To define a controller that returns JSON or XML directly

• To perform REST API validation

• To scan components

Which annotation is used to inject dependencies automatically in Spring?

• @Bean

• @Inject

• @Autowired

• @Component

When there are multiple beans of the same type, which annotation helps to choose the right one to inject?

• @Autowired

• @Qualifier

• @Component

• @Value

Which annotation gives higher priority to a bean when multiple candidates are available for autowiring?

• @Lazy

• @Qualifier

• @Primary

• @Bean

What does the @Lazy annotation do in Spring?

• Prevents a bean from being autowired

• Loads the bean immediately at application start

• Delays the creation of bean until it is needed

• Makes the bean thread-safe

What is the default scope of Spring beans?

• Prototype

• Request

• Session

• Singleton

What is the key difference between singleton and prototype scopes?

• Singleton creates a new instance every time

• Prototype shares the same instance

• Singleton is created once per Spring container; prototype is created on every request

• There is no difference

Which scope is best suited when each user request should have a new bean instance?

• Singleton

• Session

• Prototype

• Global