CODEWITHSUNDEEP
javaspringspring-bootmaven
Charlie
Charlie

Reputation: 2271

What is the purpose of org.springframework.boot.spring-boot POM?

What is the purpose of this POM in Sprint Boot org.springframework.boot.spring-boot

It includes

org.springframework.spring-core
org.springframework.spring-context

So in something like org.springframework.boot.spring-boot-starter-web you have

org.springframework.spring-webmvc
org.springframework.boot.spring-boot-starter
org.springframework.boot.spring-boot-starter-json
org.springframework.boot.spring-boot-starter-tomcat

Why not just make org.springframework.boot.spring-boot-starter-web

org.springframework.spring-webmvc
org.springframework.spring-core
org.springframework.spring-context    
org.springframework.boot.spring-boot-starter-json
org.springframework.boot.spring-boot-starter-tomcat

Upvotes: 2

Views: 1502

Answers (1)

Qiu Zhou
Qiu Zhou

Reputation: 1275

spring-boot-starter has following dependencies:

jakarta.annotation-api
spring-core
spring-boot
spring-boot-autoconfigure
spring-boot-starter-logging

if you replace spring-boot-starter with spring-core and spring-context, then you miss out all the classes and annotations that are defined in spring-boot and spring-boot-autoconfigure(spring-boot depends on spring-core and spring-context, but it has implemented some important classes itself, see below).

take spring-boot-starter-web as an example, usually we need to set server.port in our application.yml, this property is defined in ServerProperties class in spring-boot-autoconfigure project(that's why we need spring-boot-starter in org.springframework.boot.spring-boot-starter-web), there are other commonly used properties such as server.address, server.servlet.context-path, and server.ssl.* ....etc.They are all defined here in spring-boot-autoconfigure project.

in order to auto configure the properties defined in ServerProperties, class ServletWebServerFactoryAutoConfiguration is created to take ServerProperties as a parameter and apply it's values to set up software like tomcat

now see that ServerProperties is neither annotated with @Configuration nor @Component, so it wouldn't be instantiated when component-scan is happening, so this annotation EnableConfigurationProperties is created to make sure ServerProperties's instance will be injected. this annotation is defined in spring boot project, that's why we need spring-boot dependency. And it's used here.

for what is a spring boot starter and how it works, here is a helpful article: Quick Guide to Building a Spring Boot Starter

Upvotes: 2

Related Questions