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SPRINGBOOT Interview Questions

By Gourav S
What are the Features of Spring Boot? There are many useful features of Spring Boot. Some of them are mentioned below: Auto-configuration – Spring Boot automatically configures dependencies by using @EnableAutoconfiguration annotation and reduces boilerplate code. Spring Boot Starter POM – These Starter POMs are pre-configured dependencies for functions like database, security, maven configuration etc. Spring Boot CLI (Command Line Interface) – This command line tool is generally for managing dependencies, creating projects and running the applications. Actuator – Spring Boot Actuator provides health check, metrics and monitors the endpoints of the application. It also simplifies the troubleshooting management. Embedded Servers – Spring Boot contains embedded servers like Tomcat and Jetty for quick application run. No need of external servers. Features of Spring Boot What does the @SpringBootApplication annotation do internally? The @SpringBootApplication annotation combines three annotations. Those three annotations are: @Configuration, @EnableAutoConfiguration, and @ComponentScan . @AutoConfiguration : This annotation automatically configuring beans in the class path and automatically scans the dependencies according to the application need. @ComponentScan : This annotation scans the components (@Component, @Service, etc.) in the package of annotated class and its sub-packages. @Configuration: This annotation configures the beans and packages in the class path. @SpringBootApplication automatically configures the application based on the dependencies added during project creation and bootstraps the application by using run() method inside the main class of an application. @SpringBootApplication = @Configuration + @EnableAutoConfiguration + @ComponentScan

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