In a Spring Boot application, how can you specify the conditions under which a method's cache can be evicted?
- By using the @CacheEvict annotation and specifying the condition attribute.
- By calling the cache.evict() method with a condition check in your code.
- By setting the spring.cache.eviction property in the application.properties file.
- By using the @EvictionCondition annotation.
You can specify the conditions under which a method's cache can be evicted in a Spring Boot application by using the @CacheEvict annotation and specifying the condition attribute. This attribute allows you to define a SpEL (Spring Expression Language) expression that determines whether the eviction should occur. The other options are not standard ways to specify eviction conditions in Spring Boot and are not recommended practices.
In Spring Security, which interface is primarily used to load user-specific data?
- Authentication Manager
- Authentication Provider
- Security Context
- UserDetailsService
In Spring Security, the UserDetailsService interface is primarily used to load user-specific data. It is crucial for retrieving user details, including username, password, and authorities, which are necessary for authentication and authorization. The Authentication Manager is responsible for managing authentication requests, and the Authentication Provider performs the actual authentication based on the loaded user data. The Security Context stores the security-related information but is not primarily used for loading user data.
Imagine you are developing a complex Spring Boot application with custom beans, controllers, services, and repositories. How would you effectively utilize different annotations for a clean and maintainable code structure?
- @Component for beans, @Controller for web controllers, @Service for business logic, and @Repository for data access.
- @SpringBootApplication for all components.
- @Entity for beans, @RestController for web controllers, @Service for business logic, and @Resource for data access.
- @Configuration for all components.
In a complex Spring Boot application, proper annotation usage is crucial for clean and maintainable code. Use @Component for general beans, @Controller for web controllers, @Service for business logic, and @Repository for data access. This follows the recommended Spring Boot convention, ensuring a clear and structured codebase. The other options mix annotations inappropriately or use annotations that don't align with their intended purposes.
Which annotation is primarily used in Spring Data JPA to mark a class as a JPA entity?
- @Controller
- @Entity
- @Repository
- @Service
The primary annotation used in Spring Data JPA to mark a class as a JPA entity is @Entity. This annotation indicates that the class represents a persistent entity that can be stored in a relational database using JPA. The other annotations listed are not used for marking classes as JPA entities; they serve different purposes in the Spring framework.
To secure REST APIs in Spring Security, the _____ class can be used to ensure that the user is authenticated for any HTTP request.
- AuthenticationFilter
- AuthorizationFilter
- SecurityFilterChain
- UserDetailsService
In Spring Security, the SecurityFilterChain class is used to ensure that the user is authenticated for any HTTP request. It defines a chain of filters that can be applied to incoming requests to handle various security-related tasks, including authentication. This class is essential for securing REST APIs.
In Spring Boot, how do you customize the behavior of a mocked object for specific arguments using Mockito?
- By using the @InjectMocks annotation
- By using the @Mockito annotation
- By using the @Spy annotation
- By using the when(...).thenReturn(...) syntax
To customize the behavior of a mocked object for specific arguments using Mockito in Spring Boot, you can use the when(...).thenReturn(...) syntax. This allows you to specify the return value of a method call based on the input arguments. The other annotations mentioned are used for different purposes in Mockito.
In Spring Security, the _____ annotation is used to apply security constraints based on complex expressions.
- @Authorize
- @PreAuthorize
- @Secure
- @Secured
In Spring Security, the @PreAuthorize annotation is used to apply security constraints based on complex expressions. These expressions are defined using the Spring Expression Language (SpEL) and allow fine-grained control over method access.
When using JSR-303 Bean Validation, how can you validate a field’s value against a dynamic value or condition?
- By hardcoding the dynamic value directly in the annotation
- Using @AssertTrue with a custom validation method
- Using @ValueConstraint to specify dynamic values
- Using a custom validator class that accesses the dynamic value externally
When using JSR-303 Bean Validation, you can validate a field's value against a dynamic value or condition by using @AssertTrue with a custom validation method (Option 2). This method allows you to implement your logic to validate the field against dynamic values or external conditions. Hardcoding the dynamic value directly in the annotation (Option 1) is not flexible and should be avoided.
When designing RESTful APIs in Spring Boot, the _____ annotation can be used to handle HTTP GET requests specifically.
- @PostMapping
- @GetMapping
- @RequestMapping
- @RequestHeader
In Spring Boot, the @GetMapping annotation is specifically used to handle HTTP GET requests. It maps a method to a GET request for a particular URI, making it a crucial part of designing RESTful APIs in Spring Boot. The other options are used for different HTTP request types and are not suitable for handling GET requests.
How can you handle concurrent session control in a Spring Security application?
- Configure the concurrency-control element in XML config.
- Use the @EnableConcurrentSession annotation.
- Set session.concurrency property in application.properties.
- Implement a custom ConcurrentSessionControlStrategy.
Concurrent session control in Spring Security is handled by using the @EnableConcurrentSession annotation along with configuring maxSessions. Options 1, 3, and 4 are not the standard approaches for handling concurrent sessions in Spring Security.