What are the considerations and best practices for using @Primary in projects with multiple beans and dependencies?
- Use @Primary to define a default bean when no qualifier is specified.
- Avoid using @Primary when there are multiple beans of the same type.
- Always use @Primary to ensure the bean is selected in all cases.
- Use @Primary only with setter-based injection, not constructor injection.
In projects with multiple beans and dependencies, @Primary should be used to define a default bean when no qualifier is specified. This provides a clear choice when there is ambiguity. However, it should be used judiciously, especially when there are multiple beans of the same type. It should not be overused, as it can lead to unexpected behavior. The other options do not accurately represent best practices for using @Primary.
To customize the storage and retrieval of cache in Spring Boot, a developer can implement the _____ interface.
- CacheableManager
- CacheResolver
- CacheProvider
- CacheCustomizer
In Spring Boot, to customize the storage and retrieval of cache, a developer can implement the CacheResolver interface. This interface provides methods to resolve cache instances dynamically. The other options are not standard interfaces for customizing caching in Spring Boot.
When configuring OAuth2 Resource Server in Spring Boot, the _____ property is used to specify the location of the public key for verifying JWT signatures.
- public_key_location
- jwt_signing_key
- token_verifier
- security_policy
When configuring an OAuth2 Resource Server in Spring Boot, the public_key_location property is used to specify the location of the public key for verifying JWT signatures. This key is essential for validating the authenticity and integrity of JWT tokens used for authentication and authorization. The other options are not typically used for specifying the public key location.
In Spring Boot, which annotation is used to denote that a test class should load only specific parts of the application context for Web tests?
- @ContextConfiguration
- @SpringBootTest
- @WebAppConfiguration
- @WebMvcTest
The @WebMvcTest annotation is used to load only the Web layer of the Spring application context, making it suitable for testing controllers and related components.
How can you conditionally exclude specific Auto Configurations in a Spring Boot application?
- Using the spring.autoconfigure.exclude property in application.properties or application.yml.
- By annotating the class with @ExcludeAutoConfiguration and specifying the classes to exclude.
- By removing the Auto Configuration JARs from the classpath.
- By using a custom excludeAutoConfiguration method in the main application class.
To conditionally exclude specific Auto Configurations, you can use the spring.autoconfigure.exclude property in your application.properties or application.yml file. This property allows you to specify the fully qualified names of the Auto Configuration classes you want to exclude. The other options do not provide a direct way to conditionally exclude Auto Configurations.
To perform integration testing in Spring Boot, the _____ annotation is used to enable full application context loading.
- @ContextConfiguration
- @IntegrationTest
- @RunWith(SpringRunner.class)
- @SpringBootTest
In Spring Boot, to perform integration testing and enable full application context loading, you use the @SpringBootTest annotation. This annotation loads the entire Spring application context, making it suitable for integration testing scenarios.
To customize the response body of a global exception handler method in Spring Boot, the method should return an object of type _____.
- CustomResponse
- ExceptionResponse
- ResponseEntity
- ResponseObject
To customize the response body of a global exception handler method in Spring Boot, the method should return an object of type ResponseEntity. This allows you to create a custom response with specific status codes, headers, and response bodies when an exception is caught globally. It provides flexibility in crafting error responses tailored to your application's needs.
You need to optimize a Spring Boot application for faster startup times. What strategies and configurations would you employ for this optimization?
- Minimizing the number of auto-configured beans, using lazy initialization for non-essential components, and optimizing classpath scanning.
- Increasing the number of auto-configured beans to pre-warm the application, enabling verbose logging for debugging, and adding more third-party dependencies.
- Reducing the amount of available memory for the application, disabling caching, and using blocking I/O for database operations.
- Increasing the number of threads in the application thread pool, even if it leads to contention.
Optimizing a Spring Boot application for faster startup times involves strategies like minimizing the number of auto-configured beans, using lazy initialization for non-essential components, and optimizing classpath scanning. These approaches reduce the initial overhead and improve startup times. The other options, such as increasing auto-configured beans or increasing thread pool size without consideration, can lead to performance issues or longer startup times.
To define hierarchical properties in a YAML configuration file in Spring Boot, you can use _____.
- YAML anchors
- YAML hierarchy
- YAML inheritance
- YAML nesting
In Spring Boot, you can define hierarchical properties in a YAML configuration file using YAML nesting. YAML allows you to structure your configuration data hierarchically, making it easy to organize and manage complex configuration settings for your application. This helps in maintaining a clean and readable configuration.
What is the primary purpose of using TestContainers in Spring Boot?
- To create lightweight, isolated Docker containers for testing
- To generate code coverage reports
- To manage application properties
- To perform load testing
The primary purpose of using TestContainers in Spring Boot is to create lightweight, isolated Docker containers for testing. This allows you to run tests in an environment that closely resembles your production environment and is especially useful for testing database interactions.