How can you access a defined property in the application properties file within a Spring Boot application class?
- By using the @Value annotation.
- By modifying the property file directly.
- By creating a custom annotation.
- By defining a new property in the code.
In Spring Boot, you can access a defined property in the application properties file within a Spring Boot application class by using the @Value annotation. This annotation allows you to inject property values directly into your beans, making it easy to access and use configuration properties within your code. The other options are not standard ways to access properties in Spring Boot.
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.
In Spring, what is the process of supplying an external dependency to an object called?
- Bean Inversion
- Bean Registration
- Dependency Injection
- Dependency Wiring
The process of supplying an external dependency to an object in Spring is called "Dependency Injection." It involves injecting or providing the required dependencies to an object rather than having the object create them itself, promoting loose coupling and easier testing.
What is the primary purpose of Auto Configuration in Spring Boot?
- Controlling database access.
- Enhancing security.
- Managing network connections.
- Reducing application complexity.
The primary purpose of Auto Configuration in Spring Boot is to reduce application complexity. It achieves this by automatically configuring application components based on dependencies and classpath settings. This simplifies the development process by eliminating much of the manual configuration that would otherwise be required. While security, database access, and network connections are important aspects of an application, they are not the primary focus of Auto Configuration.
In a Spring Boot application, the _____ annotation allows the conditional caching of method return values based on the evaluation of a SpEL expression.
- @CacheConfig
- @CacheEvict
- @Cacheable
- @Caching
In a Spring Boot application, the @Cacheable annotation is used to enable conditional caching of method return values based on the evaluation of a SpEL (Spring Expression Language) expression. By using this annotation, you can specify when a method's result should be cached, which is helpful for optimizing performance in certain scenarios.
In reactive programming with Spring Boot, how can you handle errors in a reactive stream?
- By avoiding errors altogether through careful coding.
- By relying on the default error handling provided by Spring Boot.
- By using the onError operator and other error-handling operators provided by Project Reactor.
- By using try-catch blocks around reactive operators.
In reactive programming with Spring Boot, you can handle errors in a reactive stream by using the onError operator and other error-handling operators provided by Project Reactor. These operators allow you to define how to react to errors within the stream, whether it's by logging, retrying, switching to a fallback stream, or propagating the error to the subscriber. This enables robust error handling and recovery strategies in reactive applications.
To inject mock objects into the tested object in a Spring Boot unit test, the _____ annotation is used with Mockito.
- @Autowired
- @InjectMocks
- @MockBean
- @MockitoInject
In Spring Boot unit testing with Mockito, you use the @InjectMocks annotation to inject mock objects into the object being tested. This allows you to control the behavior of dependencies during testing.
You are developing a Spring Boot application with a large team. How would you manage and segregate configuration properties for different modules?
- By embedding configuration properties directly in the source code to ensure they are tightly coupled with their respective modules.
- By relying on a centralized configuration service that manages properties for all modules in a monolithic manner.
- By storing all configuration properties in a single file and maintaining a shared spreadsheet for tracking properties used by different modules.
- By using Spring Boot's external configuration mechanisms like application.properties or application.yml files, and organizing them into separate folders or packages for each module.
When developing a Spring Boot application with a large team, it's best to use Spring Boot's external configuration mechanisms like application.properties or application.yml files. These can be organized into separate folders or packages for each module, making it easier to manage and segregate configuration properties. Storing all properties in a single file or embedding them in the source code is not a scalable or maintainable approach. A centralized configuration service can be complex and less flexible for individual modules.
What does the @ConditionalOnClass annotation do in the context of Auto Configuration?
- It defines a required class for Auto Configuration.
- It disables Auto Configuration for a specific class.
- It indicates a conditional bean creation.
- It specifies the class to be ignored.
The @ConditionalOnClass annotation, when used in the context of Auto Configuration, defines a required class for Auto Configuration to be enabled. If the specified class is present on the classpath, the associated configuration will be applied. This allows developers to conditionally configure components based on the availability of certain classes. It does not ignore, disable, or indicate conditional bean creation.