The _____ annotation in Spring Boot is used to perform a cache eviction operation when a method is executed successfully.
- @CacheConfig
- @CacheEvict
- @CachePut
- @Cacheable
In Spring Boot, the @CacheEvict annotation is used to perform a cache eviction operation when a method is executed successfully. This annotation is useful when you want to remove specific cache entries or clear the cache entirely after a successful method execution, ensuring that you always have up-to-date data in your cache.
How can you implement centralized configuration management in a Spring Cloud microservices environment?
- Hardcoding configuration in each microservice
- Using Spring Boot's application.properties file
- Using Spring Cloud Config Server
- Using a relational database
In a Spring Cloud microservices environment, centralized configuration management is typically implemented using Spring Cloud Config Server, which allows you to store and manage configurations in a centralized location.
The @RequestBody annotation is used to bind the value of the HTTP request body to a(n) _____ in a controller method.
- ResponseEntity
- HttpRequest
- ModelAttribute
- Method parameter
In Spring Boot, the @RequestBody annotation is used to bind the value of the HTTP request body to a method parameter in a controller method. This allows you to access and process the data sent in the request body. The other options represent different types or concepts and are not used for binding request bodies to controller methods.
In the Spring Boot project structure, the _____ directory is recommended for placing application's static content.
- assets
- resources/static
- static-content
- web-resources
In Spring Boot, the recommended directory for placing static content like CSS, images, and JavaScript files is the resources/static directory. When you place static resources there, Spring Boot serves them directly to clients, making it suitable for web assets that do not require dynamic processing by a controller.
You are developing a Spring Boot application which utilizes reactive programming to handle real-time data. How would you design the application to handle high volumes of concurrent requests efficiently?
- Use a single-threaded event loop to process requests.
- Use a thread pool to handle incoming requests.
- Use the @Async annotation to make controller methods asynchronous.
- Implement reactive backpressure to control the rate of data flow.
When dealing with high volumes of concurrent requests in a reactive Spring Boot application, it's crucial to implement reactive backpressure. Reactive backpressure allows the application to control the rate at which data flows, preventing overloading. The other options may not efficiently handle high concurrency. A single-threaded event loop would be blocking, a thread pool may lead to resource exhaustion, and the @Async annotation doesn't necessarily implement backpressure.
How can @ControllerAdvice be used to customize the response body of a global exception handler?
- By extending @ControllerAdvice from a custom class.
- By annotating the custom class with @ExceptionHandler.
- By configuring the @ControllerAdvice annotation with custom media types.
- By configuring the @ControllerAdvice annotation with @ResponseBodyAdvice classes.
@ControllerAdvice in Spring can be used to handle exceptions globally. To customize the response body, you can use @ControllerAdvice in combination with @ResponseBodyAdvice classes. These classes can customize the response format for specific exception types. The other options may be components used in the process but don't directly address customizing the response body.
In Spring Boot, to map HTTP GET requests to a specific handler method, the _____ annotation is used.
- @GetMapping
- @RequestMapping
- @RequestMethod
- @GetMappingRequestMapping
In Spring Boot, the @GetMapping annotation is used to map HTTP GET requests to a specific handler method. This annotation helps define which method should be invoked when a GET request is made to a particular URL. The other options are not used specifically for mapping GET requests in Spring Boot.
The _____ property in Spring Boot is used to set the TTL (Time-To-Live) for cache entries.
- spring.cache.duration
- spring.cache.expire
- spring.cache.timeout
- spring.cache.ttl
The spring.cache.ttl property in Spring Boot is used to set the Time-To-Live (TTL) for cache entries. This property allows you to specify the maximum amount of time a cache entry should remain valid. When the TTL expires, the cached data is considered stale and is evicted from the cache. It's an important property for cache configuration in Spring Boot.
How can you perform integration testing on security configurations in a Spring Boot application to ensure security constraints are met?
- Use @SpringBootTest with a custom security configuration
- Use @WebMvcTest with a custom security configuration
- Use @AutoConfigureMockMvc with a custom security configuration
- Use @SecurityTest annotation
To perform integration testing on security configurations in Spring Boot, you can use the @SpringBootTest annotation with a custom security configuration. This allows you to test security constraints in the context of the whole application. The other options may not cover all security aspects in the same way.
When using _____ in Spring Boot, you can simulate HTTP requests to test web layers without running the server.
- @ControllerTest
- @RestTest
- @ServiceTest
- @WebMvcTest
In Spring Boot, the @WebMvcTest annotation is used to simulate HTTP requests and test the web layers (controllers) without starting a full web server. It focuses on testing the web-related components of your application.