How can you manage bean lifecycle events, such as initialization and destruction, in Spring Boot?
- By using the @Bean annotation with @PostConstruct and @PreDestroy methods.
- By declaring beans in an XML configuration file.
- By using the @Service annotation with initMethod and destroyMethod attributes.
- By configuring bean lifecycles in the main application class constructor.
You can manage bean lifecycle events, such as initialization and destruction, in Spring Boot by using the @Bean annotation along with @PostConstruct and @PreDestroy methods. These methods allow you to specify custom initialization and destruction logic for your beans. The other options mentioned (XML configuration, @Service with initMethod and destroyMethod, and configuring lifecycles in the main application class constructor) are not the recommended or common approaches for managing bean lifecycles in Spring Boot.
Imagine you are developing a Spring Boot application where you need to validate incoming request payloads against a complex business rule. How would you approach implementing such a validation?
- Use custom validation annotations.
- Implement validation logic in a filter or interceptor.
- Embed validation logic in the data access layer.
- Use a third-party validation library.
When dealing with complex validation rules in a Spring Boot application, one effective approach is to use custom validation annotations. This allows you to define and apply custom validation logic directly to your model classes, keeping your code clean and maintainable. While the other options may work for simpler scenarios, they are less suitable for complex business rule validation.
When dealing with multiple exception resolver beans in Spring Boot, how can you define the order of their execution?
- By configuring the 'order' property in the application.properties file.
- By setting the 'order' property in the @ExceptionHandler annotation.
- By specifying the order in which beans are defined in the application context.
- By using the @Order annotation on the exception resolver bean classes.
When dealing with multiple exception resolver beans in Spring Boot, you can define the order of their execution by using the @Order annotation on the exception resolver bean classes. This annotation allows you to specify the order in which the beans should be prioritized. Beans with lower order values are executed before those with higher order values. This approach gives you fine-grained control over the execution order of exception resolvers.
How do you access the data sent in the request body of a POST request in a Spring Boot controller method?
- Using the @RequestParam annotation.
- By retrieving it from the HttpServletRequest object.
- By declaring a method parameter annotated with @RequestBody.
- It is automatically available as a method argument.
To access the data sent in the request body of a POST request in a Spring Boot controller method, you should declare a method parameter and annotate it with @RequestBody. This annotation tells Spring to deserialize the request body data into the specified object or data type. The other options, such as @RequestParam and retrieving it from HttpServletRequest, are used for different scenarios and do not directly handle the request body of a POST request.
How do you configure a cache manager in Spring Boot?
- By adding the @Cacheable annotation to methods that should be cached.
- By modifying the 'application.properties' file with cache settings.
- By creating a custom caching class and injecting it into services.
- By disabling caching entirely in the Spring Boot application.
In Spring Boot, cache manager configuration is typically done by modifying the 'application.properties' file with cache-related settings. Spring Boot provides easy-to-use properties for configuring popular caching solutions like EhCache, Caffeine, and more. The other options are not the standard way to configure a cache manager in Spring Boot.
How can you encrypt and decrypt property values in Spring Boot to secure sensitive information?
- By using the @EncryptProperty annotation.
- By configuring property encryption in application.properties.
- By using the spring.security module for encryption.
- By using the Jasypt library and configuring it in application.properties.
To encrypt and decrypt property values in Spring Boot, you can use the Jasypt library and configure it in the application.properties file. This library provides a straightforward way to secure sensitive information such as database passwords. While there are other security-related options in Spring Boot, the Jasypt library is commonly used for property encryption.
For web services communication, SOAP relies on _______ for message format validation.
- JSON
- REST
- WSDL
- XML Schema
SOAP uses XML Schema for message format validation, ensuring that the structure and content of messages conform to a predefined schema.
What distinguishes Microservices Architecture from traditional SOA?
- Centralized data storage
- Granular and independent services
- Monolithic and tightly coupled services
- Standardized communication protocols
Microservices Architecture is characterized by granular and independent services, each responsible for a specific business capability. This contrasts with traditional SOA, which often involves monolithic and tightly coupled services.
What is the primary purpose of Web Services Interoperability?
- Designing user interfaces
- Ensuring security
- Facilitating communication between
- Managing databases
Web Services Interoperability aims to facilitate communication between different applications and systems. It ensures seamless integration by enabling diverse software to work together effectively, irrespective of their underlying technologies and platforms.
API Gateways often use _______ to ensure that requests are only served to authenticated and authorized users.
- API keys
- JSON
- OAuth
- Tokens
API Gateways often use OAuth to ensure that requests are only served to authenticated and authorized users.