Spring Boot Dependency Management

1. Introduction

Dependency Management in Spring Boot is used to manage all required libraries in one place.

A dependency is:

A library that provides functionality
Used in your application

Spring Boot makes dependency management easy and automatic.

2. Importance of Dependency Management

Centralized management in one file
Automatic version control
Prevents version conflicts
Easy to maintain

3. How Dependency Management Works

Add dependencies in:
- pom.xml (Maven)
- build.gradle (Gradle)
Dependencies are downloaded from Maven Central
Stored in local system (.m2 folder)
Spring Boot uses them automatically

4. Build Tools

Spring Boot supports:

Maven

Uses pom.xml
Most commonly used

Gradle

Uses build.gradle
Faster build system

5. Spring Boot Starters

Starters are pre-defined dependency packages.

They include:

Required libraries
Default configuration

Example

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

Types of Starters

Application starters
- spring-boot-starter-web
Technical starters
- spring-boot-starter-security
Production starters
- spring-boot-starter-actuator

6. Maven Dependency Example

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<dependencies>

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

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

    <dependency>
        <groupId>org.projectlombok</groupId>
        <artifactId>lombok</artifactId>
        <optional>true</optional>
    </dependency>

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

</dependencies>

7. Starter Parent (Important)

Spring Boot uses a parent configuration:

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<parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>3.x.x</version>
</parent>

Benefits

Default configuration
No need to specify dependency versions
Automatic version management

8. Overriding Dependency Version

You can override versions:

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<properties>
    <slf4j.version>2.x.x</slf4j.version>
</properties>

9. Maven Plugin

Used to build executable jar:

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<build>
    <plugins>
        <plugin>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-maven-plugin</artifactId>
        </plugin>
    </plugins>
</build>

10. Developer Tools

Used for faster development:

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

11. Gradle Example

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dependencies {
    implementation("org.springframework.boot:spring-boot-starter-web")
    testImplementation("org.springframework.boot:spring-boot-starter-test")
}

12. Key Points

Do not manually add versions in most cases
Spring Boot manages versions automatically
Use starters for easy setup

13. Conclusion

Dependency management is core feature of Spring Boot
Makes development simple and fast
Reduces configuration effort