Spring Framework Spring Boot & Auto-Configuration

Question 1

What is the primary annotation on the main class of a Spring Boot application?

Accepted Answer

@SpringBootApplication

Answer

@SpringBootApplication is a convenience annotation combining @Configuration, @EnableAutoConfiguration, and @ComponentScan for the main entry point.

Question 2

Where does Spring Boot look for application properties by default?

Accepted Answer

src/main/resources/application.properties

Answer

Spring Boot automatically loads application.properties (or application.yml) from src/main/resources on the classpath.

Question 3

What does Spring Boot's auto-configuration feature do?

Accepted Answer

Automatically configures beans based on classpath dependencies and properties

Answer

Auto-configuration detects the libraries on the classpath and automatically creates and configures Spring beans with sensible defaults.

Question 4

Which Spring Boot starter dependency should be added for building REST APIs?

Accepted Answer

spring-boot-starter-web

Answer

spring-boot-starter-web includes Spring MVC, embedded Tomcat, and JSON serialization support for building RESTful web services.

Question 5

How do you override a specific auto-configuration class in Spring Boot?

Accepted Answer

Use @SpringBootApplication(exclude = {ClassName.class})

Answer

The exclude attribute of @SpringBootApplication (or @EnableAutoConfiguration) accepts an array of auto-configuration classes to disable.

Spring Framework Practice Test