Springboot

What is Springboot?

Java Spring Boot is an open-source tool that makes it easier to use Java-based frameworks to create microservices and web apps.

Nowadys React and Spring Boot are two of the hottest technologies for developing Full Stack applications.

Features

• Create stand-alone Spring applications

• Embed Tomcat, Jetty or Undertow directly (no need to deploy WAR files)

• Provide opinionated ‘starter’ dependencies to simplify your build configuration

• Automatically configure Spring and 3rd party libraries whenever possible

• Provide production-ready features such as metrics, health checks, and externalized configuration

• Absolutely no code generation and no requirement for XML configuration

How does it work?

Spring Boot automatically configures your application based on the dependencies you have added to the project by using @EnableAutoConfiguration annotation. For example, if MySQL database is on your classpath, but you have not configured any database connection, then Spring Boot auto-configures an in-memory database.

The entry point of the spring boot application is the class contains @SpringBootApplication annotation and the main method.

Spring Boot automatically scans all the components included in the project by using @ComponentScan annotation.

Spring Boot Starters

For example, if you want to use Spring and JPA for database access, it is sufficient if you include spring-boot-starter-data-jpa dependency in your project.

For e.g.

• Spring Boot Starter Actuator dependency is used to monitor and manage your application. Its code is shown below −

<dependency>
   <groupId>org.springframework.boot</groupId>
   <artifactId>spring-boot-starter-actuator</artifactId>
</dependency>

• Spring Boot Starter Security dependency is used for Spring Security. Its code is shown below −

<dependency>
   <groupId>org.springframework.boot</groupId>
   <artifactId>spring-boot-starter-security</artifactId>
</dependency>

• Spring Boot Starter web dependency is used to write a Rest Endpoints. Its code is shown below −

<dependency>
   <groupId>org.springframework.boot</groupId>
   <artifactId>spring-boot-starter-web</artifactId>
</dependency>

• Spring Boot Starter Thyme Leaf dependency is used to create a web application. Its code is shown below −

<dependency>
   <groupId>org.springframework.boot</groupId>
   <artifactId>spring-boot-starter-thymeleaf</artifactId>
</dependency>

• Spring Boot Starter Test dependency is used for writing Test cases. Its code is shown below −

<dependency>
   <groupId>org.springframework.boot</groupId>
   <artifactId>spring-boot-starter-test</artifactId>
</dependency>

Spring boot flow architecture