How Spring-Boot works internally?

 

Spring Boot is a framework for building and deploying production-ready applications quickly and easily. It is built on top of the Spring framework and takes care of a lot of the configuration and setup tasks that are required to get a Spring application up and running.

Spring Boot works by using convention over configuration, which means that it provides sensible defaults for common settings, such as security and database configuration, and allows developers to override these defaults as needed.

Here is a high-level overview of how Spring Boot works internally:

1. Auto-configuration: Spring Boot automatically configures your application based on the dependencies you have added to your project. For example, if you include the spring-boot-starter-web dependency, Spring Boot will automatically configure a basic web application for you.

2. Embedded web server: Spring Boot includes an embedded web server, such as Tomcat, which makes it easy to run your application without the need for a separate web server.

3. Properties: Spring Boot allows you to configure your application using properties in a application.properties file or application.yml file. These properties can be overridden at runtime using command-line arguments or environment variables.

4. Spring Beans: Spring Boot uses the Spring framework to manage its beans and dependencies. Beans are defined using the @Component or @Service annotations and can be easily wired together using the @Autowired annotation.

5. Actuator: Spring Boot includes an actuator, which provides endpoints for monitoring and managing your application. For example, you can view the health of your application, view logs, and get detailed information about your application's configuration.

6. CLI: Spring Boot includes a CLI (Command Line Interface), which allows you to quickly create new projects, run applications, and perform other tasks from the command line.

7. Deployment: Spring Boot makes it easy to deploy your application to a variety of platforms, such as cloud providers or traditional infrastructure. You can package your application as a .jar file or as a .war file, depending on your needs, and deploy it to your desired platform.

This is a high-level overview of how Spring Boot works internally. Spring Boot provides many more features and capabilities, and it is designed to be highly customizable and extensible.

Additionally, Spring Boot also provides the following features to help you build and deploy your applications:

1. Starter POMs: Spring Boot provides a set of "starter POMs" that make it easy to add the right dependencies to your project. For example, if you want to build a web application, you can include the spring-boot-starter-web dependency, which will automatically include all the necessary dependencies to build a web application.

2. Auto-configured Data Sources: Spring Boot can automatically configure a data source for you based on the properties you have defined in your application. For example, if you include the spring-boot-starter-data-jpa dependency, Spring Boot will automatically configure a data source for you and wire it up to your JPA entities.

3. Testing: Spring Boot provides a set of testing utilities that make it easy to write tests for your application. For example, you can use the @SpringBootTest annotation to load a full Spring application context in your tests.

4. Externalized Configuration: Spring Boot allows you to externalize your configuration so that you can easily change the configuration of your application without changing its code. For example, you can define properties in a application.properties file or application.yml file and then use the @Value annotation to inject these properties into your application.

5. Customizable Banner: Spring Boot allows you to customize the banner that is displayed when your application starts. You can write your own banner using ASCII art or you can use one of the many existing banners.

6. Command Line Interface: Spring Boot provides a CLI (Command Line Interface) that makes it easy to create new projects, run applications, and perform other tasks from the command line. You can also write your own CLI commands to extend the functionality of the Spring Boot CLI.

These are just a few examples of the many features and capabilities that Spring Boot provides. The goal of Spring Boot is to make it easy for you to build and deploy production-ready applications, and it provides a wide range of features to help you achieve this goal.