Dependency management declares and controls the external libraries an application needs. In a Maven-based Spring Boot project, the generated pom.xml records these dependencies and connects them to a managed Spring Boot version. section 1.2.2
A Spring Boot Maven project uses dependency management to:
- Inherit library versions from the spring-boot-starter-parent instead of repeating each version. section 1.2.2
- Declare Spring Web, Thymeleaf, DevTools, and testing dependencies under the dependencies element. section 1.2.2
- Use starter artifacts that transitively pull in the libraries needed for a common Spring capability. section 1.2.2
Generated Maven configuration
Spring Initializr can generate a pom.xml whose parent identifies Spring Boot, whose properties select Java 11, and whose dependencies include starters for web development, templates, and testing. Maven then packages and runs the application using the project configuration. section 1.2.2
Listing 1.1 The initial Maven build specification
<?xml version="1.0" encoding="UTF-8"?><project
xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0
https://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.5.3</version> #1
<relativePath />
</parent>
<groupId>sia</groupId>
<artifactId>taco-cloud</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>taco-cloud</name>
<description>Taco Cloud Example</description>
<properties>
<java.version>11</java.version>
</properties>
<dependencies>
<dependency> #2
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-thymeleaf</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-devtools</artifactId>
<scope>runtime</scope>
<optional>true</optional>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
<exclusions>
<exclusion>
<groupId>org.junit.vintage</groupId>
<artifactId>junit-vintage-engine</artifactId>
</exclusion>
</exclusions>
</dependency>
</dependencies>
<build>
<plugins>
<plugin> #3
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
<repositories>
<repository>
<id>spring-milestones</id>
<name>Spring Milestones</name>
<url>https://repo.spring.io/milestone</url>
</repository>
</repositories>
<pluginRepositories>
<pluginRepository>
<id>spring-milestones</id>
<name>Spring Milestones</name>
<url>https://repo.spring.io/milestone</url>
</pluginRepository>
</pluginRepositories>
</project>
Inspect the complete initial Maven build specification, including the parent POM, Java version, and dependency declarations. section 1.2.2
