In a Spring Boot application, how can you specify that a method parameter should be bound to a web request parameter?
- Using the @RequestParam annotation with the parameter name.
- By using the @PathVariable annotation with the parameter name.
- Declaring it as a regular method parameter without any annotations.
- Using the @ResponseBody annotation with the parameter name.
In a Spring Boot application, you can specify that a method parameter should be bound to a web request parameter by using the @RequestParam annotation followed by the parameter name. This annotation allows you to map a request parameter to a method parameter, providing access to values sent in the HTTP request. The other options are not typically used for binding request parameters.
What is the primary file used to define properties in Spring Boot?
- application.properties
- application.yml
- bootstrap.properties
- config.properties
In Spring Boot, the application.properties file is the primary file used to define properties. This file allows you to configure various aspects of the application, such as server port, database connections, etc. The application.properties file is typically located in the src/main/resources directory, and its properties are loaded at runtime by Spring Boot. The properties defined in this file can also be overridden by external configurations.
How can you exclude certain auto-configuration classes in Spring Boot to prevent them from being applied?
- By using the @ExcludeAutoConfiguration annotation.
- By removing the auto-configuration JAR files from the classpath.
- By specifying exclusions in the application.properties file.
- By annotating a class with @EnableAutoConfiguration(exclude = ...)
In Spring Boot, you can exclude certain auto-configuration classes by specifying their names in the spring.autoconfigure.exclude property in the application.properties file. This prevents those specific auto-configurations from being applied. The other options either do not exist in Spring Boot or do not serve the same purpose of excluding auto-configurations.
In OAuth2, the _____ grant type is used by clients to exchange user credentials for an access token.
- Authorization Code
- Client Credentials
- Implicit
- Resource Owner Password Credentials
In OAuth2, the "Resource Owner Password Credentials" grant type is used by clients to exchange user credentials (username and password) directly for an access token. This grant type is typically used when the client and authorization server trust each other, and it's not suitable for public clients.
In a Spring Data JPA repository, which annotation is used to annotate a custom query when the derived query mechanism is not sufficient?
- @Query
- @CustomQuery
- @CustomMethod
- @CustomRepo
In Spring Data JPA, when the derived query mechanism is not sufficient, you can annotate a custom query method with the @Query annotation. This annotation allows you to define custom queries using JPQL or native SQL. There's no @CustomQuery annotation in Spring Data JPA, and the other options mentioned are not standard annotations for this purpose.
In Spring Boot, to create a condition based on the presence or absence of a specific bean, the _____ annotation can be used.
- @ConditionalOnBean
- @ConditionalOnClass
- @ConditionalOnMissingBean
- @ConditionalOnProperty
In Spring Boot, the @ConditionalOnBean annotation is used to create a condition based on the presence or absence of a specific bean in the application context. This allows you to configure certain components or behavior only if a particular bean is defined, making it a powerful tool for conditional configuration.
How can you configure profiles in Spring Boot to optimize configuration loading during testing?
- Use spring.profiles.active property in application.properties file.
- Use @Profile annotation in test classes.
- Profiles cannot be optimized for testing.
- Set spring.profiles.default in application.yml.
In Spring Boot, you can optimize configuration loading during testing by using the @Profile annotation in test classes. This allows you to specify which profiles should be active during testing, overriding the application's default profile. Option (1) is not the preferred way for testing. Option (4) is incorrect as it is used to set the default profile, not for testing purposes. Option (3) is incorrect; profiles can indeed be optimized for testing.
To customize the way method parameters are bound to web requests in Spring Boot, you can use the @_____ annotation.
- @RequestParam
- @Request
- @RequestParameter
- @RequestParamBinding
To customize the way method parameters are bound to web requests in Spring Boot, you can use the @RequestParam annotation. This annotation allows you to specify how request parameters are mapped to method parameters in your controller methods. It provides options for customizing the binding process to suit your application's needs.
In the context of Global Method Security, how can custom permission evaluators be integrated to extend the functionality of method security expressions?
- By using @CustomEvaluator annotation
- By implementing the PermissionEvaluator interface
- By setting useCustomEvaluators property to true in XML configuration
- By adding a customEvaluators bean in the application context
Custom permission evaluators can be integrated by implementing the PermissionEvaluator interface. You need to provide your custom logic for evaluating permissions, and then configure Spring to use your custom evaluator in security expressions.
You are developing a Spring Boot application which has conflicting auto-configuration classes. How would you analyze and resolve these conflicts to ensure the correct configurations are applied?
- Analyze the order of auto-configuration classes and ensure the conflicting configurations are loaded in the desired order.
- Create a custom auto-configuration class to override conflicting configurations explicitly.
- Remove one of the conflicting auto-configuration classes to eliminate conflicts.
- Change the Spring Boot version to resolve auto-configuration conflicts.
Analyzing the order of auto-configuration classes is a common approach to resolve conflicts. Spring Boot follows a specific order to load auto-configurations, and understanding this order allows you to control which configurations take precedence. The other options might work in some cases but are not the most typical or recommended approaches.
Which of the following is true regarding the @SpringBootTest annotation when testing Spring Boot applications?
- It is used exclusively for unit testing individual components.
- It loads the entire Spring application context, enabling comprehensive integration testing.
- It only loads a specific set of predefined components.
- It requires a separate test configuration file.
The @SpringBootTest annotation is used for integration testing in Spring Boot. It loads the entire Spring application context, allowing you to test the interaction of various components in your application. It's suitable for end-to-end testing.
In Spring Cloud, the _____ is used for defining service instance metadata and implementing custom service instance selection policies.
- Eureka
- Hystrix
- Ribbon
- Zuul
In Spring Cloud, Eureka is used for defining service instance metadata and implementing custom service instance selection policies. Eureka is a service registry and discovery server that helps manage microservices in a distributed system.