Spring Boot Auto-Configuration and Starters 4

Question 1

Which meta-annotation is used to create a custom condition by implementing the Condition interface?

Accepted Answer

@Conditional

Answer

@Conditional(MyCondition.class) delegates the condition check to a custom class that implements the Condition interface's matches() method.

Question 2

What does the spring.autoconfigure.exclude property do when set in application.properties?

Accepted Answer

Prevents the listed auto-configuration classes from being loaded

Answer

spring.autoconfigure.exclude accepts a comma-separated list of fully qualified auto-configuration class names to skip at startup.

Question 3

Which starter would you add to enable WebSocket support in a Spring Boot application?

Accepted Answer

spring-boot-starter-websocket

Answer

spring-boot-starter-websocket pulls in the Spring WebSocket library along with the necessary Spring MVC dependencies.

Question 4

When creating a custom Spring Boot starter, which module should contain the auto-configuration code according to Spring conventions?

Accepted Answer

acme-spring-boot-autoconfigure

Answer

Convention separates the autoconfigure module (with @AutoConfiguration classes) from the starter module (which is just a POM that depends on autoconfigure).

Question 5

Which condition annotation applies configuration only when the application is running inside a web application context?

Accepted Answer

@ConditionalOnWebApplication

Answer

@ConditionalOnWebApplication is true when the ApplicationContext is a servlet-based or reactive web application context.

Spring Boot Practice Test

Spring Boot Practice Test

Spring Boot Auto-Configuration and Starters 4