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10 Top Spring Boot Interview Questions

1) Why will you choose Spring Boot over Spring Framework ?

Spring Boot simplifies Spring development by auto-configuring many components and eliminating boilerplate configurations. It allows faster development, embedded server support, and production-ready features like health checks, metrics, etc.

2) What all spring boot starter you have used or what all module you have worked on ?

Common starters used include: spring-boot-starter-web, spring-boot-starter-data-jpa, spring-boot-starter-security, spring-boot-starter-test, spring-boot-starter-thymeleaf, etc.

3) How will you run your Spring Boot application ?

You can run a Spring Boot application by using the main method with SpringApplication.run(Application.class, args) or using Maven/Gradle command: mvn spring-boot:run or gradle bootRun.

4) What is the purpose of the @SpringBootApplication annotation in a Spring Boot application ?

@SpringBootApplication is a convenience annotation that combines @Configuration, @EnableAutoConfiguration, and @ComponentScan. It is used to bootstrap and launch the Spring Boot application.

5) can I directly use @EnableAutoConfiguration ,@ComponentScan & @Configuration annotation in my main class , instead of using @SpringBootApplication annotation , if yes will my application work as expected ?

Yes, the application will still work if you manually use @Configuration, @EnableAutoConfiguration, and @ComponentScan. However, @SpringBootApplication is preferred as it simplifies configuration.

6) What is Auto configuration in spring boot ?

Auto-configuration is a feature in Spring Boot that automatically configures your application based on the dependencies present in the classpath, using sensible defaults.

7) What is Auto configuration in spring boot ?

Auto-configuration is a feature in Spring Boot that automatically configures your application based on the dependencies present in the classpath, using sensible defaults.

8) How can you disable a specific auto-configuration class in Spring Boot ?

How can you disable a specific auto-configuration class in Spring Boot ?

9) How can you customize the default configuration in Spring Boot ?

You can override the default configuration by defining your own beans or using application.properties/yml to set configuration values.

10) How Spring boot run() method works internally ?

The run() method initializes the Spring context, performs classpath scanning, sets up the environment, loads beans, and starts the embedded server.

11) What is Command line runner in spring boot ?

CommandLineRunner is a functional interface used to execute code after the Spring Boot application has started. It’s useful for executing startup logic.

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