maven-dependency-management

Maven Dependency Management

Master Maven dependency management including dependency declaration, scope management, version resolution, BOMs, and dependency tree optimization.

Overview

Maven's dependency management is a cornerstone of Java project build systems. It handles transitive dependencies, version conflicts, and provides mechanisms for controlling dependency resolution across multi-module projects.

Dependency Declaration

Basic Dependency

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-web</artifactId>
    <version>3.2.0</version>
</dependency>

Dependency with Scope

<dependency>
    <groupId>org.junit.jupiter</groupId>
    <artifactId>junit-jupiter</artifactId>
    <version>5.10.1</version>
    <scope>test</scope>
</dependency>

Optional Dependencies

<dependency>
    <groupId>com.google.code.findbugs</groupId>
    <artifactId>jsr305</artifactId>
    <version>3.0.2</version>
    <optional>true</optional>
</dependency>

Dependency Scopes

Available Scopes

Scope	Compile CP	Test CP	Runtime CP	Transitive
compile	Yes	Yes	Yes	Yes
provided	Yes	Yes	No	No
runtime	No	Yes	Yes	Yes
test	No	Yes	No	No
system	Yes	Yes	No	No
import	N/A	N/A	N/A	N/A

Scope Examples

<!-- Compile scope (default) - available everywhere -->
<dependency>
    <groupId>org.apache.commons</groupId>
    <artifactId>commons-lang3</artifactId>
    <version>3.14.0</version>
</dependency>

<!-- Provided - available at compile, not packaged -->
<dependency>
    <groupId>jakarta.servlet</groupId>
    <artifactId>jakarta.servlet-api</artifactId>
    <version>6.0.0</version>
    <scope>provided</scope>
</dependency>

<!-- Runtime - only needed at runtime -->
<dependency>
    <groupId>org.postgresql</groupId>
    <artifactId>postgresql</artifactId>
    <version>42.7.1</version>
    <scope>runtime</scope>
</dependency>

<!-- Test - only for testing -->
<dependency>
    <groupId>org.mockito</groupId>
    <artifactId>mockito-core</artifactId>
    <version>5.8.0</version>
    <scope>test</scope>
</dependency>