For optimizing the performance of RESTful APIs in Spring Boot, developers can enable _____ to compress the HTTP response.
- CORS
- GZIP
- OAuth2
- SSL
To optimize the performance of RESTful APIs in Spring Boot, developers can enable GZIP compression for the HTTP response. Enabling GZIP compression reduces the amount of data sent over the network by compressing the response before sending it to the client. This reduces the bandwidth usage and speeds up API response times, especially when dealing with large payloads. Enabling GZIP compression is a common technique for improving the performance of web applications, including RESTful APIs.
In a Spring Cloud environment, to configure a service to discover its peers using Eureka, the property ____ must be defined in the application's properties or YAML file.
- eureka.application.instance-id
- eureka.client.register-with-eureka
- eureka.client.service-url
- eureka.service.discovery
In a Spring Cloud environment, to configure a service to discover its peers using Eureka, the property eureka.client.register-with-eureka must be defined in the application's properties or YAML file. This property determines whether the service should register itself with the Eureka server. Setting it to true allows the service to register, and it will be discoverable by other services through Eureka.
In Spring Boot, which framework is primarily used for mocking objects in unit tests?
- EasyMock
- JUnit
- Mockito
- TestNG
Mockito is a popular framework used for mocking objects in unit tests in Spring Boot applications. It allows you to create mock objects and define their behavior during testing.
The _____ endpoint in OAuth2 is used by the client to obtain an access token.
- /access
- /auth
- /authorize
- /token
In OAuth2, the /token endpoint is used by the client to obtain an access token. The client exchanges its credentials or authorization code for an access token at this endpoint, allowing it to access protected resources on behalf of the user.
You are tasked with optimizing the load balancing strategy used by Ribbon in your Spring Cloud application. How would you approach customizing Ribbon’s behavior to ensure optimal distribution of requests?
- Deploy a dedicated load balancer (e.g., Nginx) in front of your Spring Cloud application to handle load balancing. Configure Ribbon to perform health checks on service instances and route traffic accordingly.
- Implement a custom IRule in Ribbon to define a load balancing strategy tailored to your application's needs. Consider factors like service health, latency, and client performance. Monitor and adjust the strategy based on real-time metrics.
- Use a weighted round-robin strategy for load balancing. Enable server-side load balancing using Spring Cloud Gateway. Implement exponential backoff retries for failed requests. Use the Least Connections strategy to minimize server load.
- Use the default Round Robin strategy as it provides equal distribution of requests. Implement client-side retries for fault tolerance. Configure a static list of servers for each client to maintain control over the request distribution.
Customizing Ribbon's behavior for optimal load balancing involves implementing a custom IRule that considers various factors such as service health, latency, and client performance. Real-time monitoring and adjustments based on metrics ensure the load balancing strategy remains effective. This approach allows you to fine-tune load balancing for your specific application requirements.
Which utility is commonly used in Spring Boot for performing HTTP requests in test scenarios?
- DataSource
- JdbcTemplate
- MockMvc
- RestTemplate
MockMvc is a widely used utility in Spring Boot for performing HTTP requests in test scenarios. It provides a convenient way to write unit tests for Spring MVC controllers and is often used for integration testing in Spring Boot applications.
The _____ file is crucial for defining custom Auto Configuration classes in Spring Boot.
- AutoConfiguration.java
- application.properties
- application.yml
- autoconfigure.properties
The "AutoConfiguration.java" file is crucial for defining custom Auto Configuration classes in Spring Boot. This is where you can define your own auto-configuration classes to customize the behavior of Spring Boot's auto-configuration process. Custom Auto Configuration classes are typically Java classes, and this file plays a central role in configuring them.
When using @PostAuthorize in Spring Security, the access control decision is made after the _____ has been invoked.
- controller
- method
- repository
- service
When using @PostAuthorize in Spring Security, the access control decision is made after the method has been invoked. This annotation allows you to specify additional checks on the return value of the method.
How can you specify that a bean should be injected with a specific qualifier when there are multiple candidates?
- Using the @Qualifier annotation.
- By using the @Inject annotation.
- Utilizing the @Autowired annotation.
- By configuring the application.properties file.
You can specify that a bean should be injected with a specific qualifier when there are multiple candidates by using the @Qualifier annotation in Spring. This annotation helps Spring identify which candidate bean should be injected into the target. The other options, such as @Inject and @Autowired, are used for dependency injection but do not directly deal with qualifier-based injection. The application.properties file is typically used for configuration and not for specifying bean injection.
The _____ plugin in a Spring Boot project's build file allows creating an executable JAR or WAR file.
- boot-executable
- executable-jar
- spring-boot-maven-plugin
- spring-war
In a Spring Boot project, you use the spring-boot-maven-plugin to create an executable JAR or WAR file. This plugin provides features like packaging your application with all its dependencies and specifying the main class to run when the JAR is executed. It simplifies the process of creating self-contained, executable Spring Boot applications.