Spring Boot Fundamentals Interview Questions

Spring Boot is a Java framework built on Spring. It provides sensible defaults, starter dependencies, auto-configuration, and an embedded server so you can create production-ready applications with less setup.

Spring Framework provides the core features such as dependency injection and MVC. Spring Boot adds conventions, auto-configuration, starter dependencies, and embedded-server support on top of Spring, so a project needs less manual configuration.

The main advantages are faster development, less XML or manual configuration, embedded servers, consistent dependency management, easy testing, and production features such as health checks and metrics.

Spring Boot reduces repetitive project setup, dependency-version conflicts, server configuration, and boilerplate integration code. It lets developers focus more on business functionality.

Convention over configuration means the framework chooses sensible defaults based on common project conventions. You only configure the parts that differ from those defaults.

An embedded server is a web server packaged inside the application. The application can start with a Java command instead of requiring a separately installed server and manually deployed WAR file.

An embedded server is a web server packaged inside the application. The application can start with a Java command instead of requiring a separately installed server and manually deployed WAR file.

SpringApplication.run() creates and refreshes the ApplicationContext, loads configuration, performs component scanning and auto-configuration, starts the embedded server when needed, and publishes startup events.

Spring Boot creates the environment, prepares the ApplicationContext, discovers configuration and components, applies conditional auto-configuration, creates beans, runs startup callbacks, and starts the web server.

ApplicationContext is Spring’s IoC container. It creates and manages beans, resolves dependencies, provides configuration, publishes events, and controls the application lifecycle.