Article

When publishing Java libraries, one of the most critical decisions is choosing where to host your artifacts. The two most popular options are Maven Central (The Central Repository) and JitPack. Each serves different needs and follows distinct philosophies. Understanding their differences is key to making the right choice for your project.

Overview at a Glance

Maven Central (The Central Repository)

What is Maven Central?

Maven Central is the official, curated repository for the Java ecosystem. It's the default repository for Maven, Gradle, and other build tools, hosting thousands of production-ready libraries.

Publishing to Maven Central

Step 1: Sonatype JIRA Account

# 1. Create account at issues.sonatype.org
# 2. Create JIRA ticket for your project
# 3. Wait for approval (usually within business days)

Step 2: GPG Signing Setup

# Generate GPG key
gpg --gen-key
# List keys
gpg --list-keys
# Distribute public key
gpg --keyserver keyserver.ubuntu.com --send-keys YOUR_KEY_ID

Step 3: Maven Configuration (pom.xml)

<project>
<!-- Required elements -->
<modelVersion>4.0.0</modelVersion>
<groupId>com.yourcompany</groupId>
<artifactId>your-library</artifactId>
<version>1.0.0</version>
<packaging>jar</packaging>
<name>Your Library Name</name>
<description>A fantastic Java library</description>
<url>https://github.com/yourcompany/your-library</url>
<licenses>
<license>
<name>Apache License, Version 2.0</name>
<url>https://www.apache.org/licenses/LICENSE-2.0.txt</url>
<distribution>repo</distribution>
</license>
</licenses>
<developers>
<developer>
<name>Your Name</name>
<email>[email protected]</email>
<organization>Your Company</organization>
</developer>
</developers>
<scm>
<connection>scm:git:https://github.com/yourcompany/your-library.git</connection>
<developerConnection>scm:git:https://github.com/yourcompany/your-library.git</developerConnection>
<url>https://github.com/yourcompany/your-library</url>
</scm>
<!-- Distribution management -->
<distributionManagement>
<snapshotRepository>
<id>ossrh</id>
<url>https://s01.oss.sonatype.org/content/repositories/snapshots</url>
</snapshotRepository>
<repository>
<id>ossrh</id>
<url>https://s01.oss.sonatype.org/service/local/staging/deploy/maven2/</url>
</repository>
</distributionManagement>
<!-- Maven Central publishing plugins -->
<build>
<plugins>
<plugin>
<groupId>org.sonatype.central</groupId>
<artifactId>central-publishing-maven-plugin</artifactId>
<version>1.0.0</version>
<extensions>true</extensions>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-gpg-plugin</artifactId>
<version>3.0.1</version>
<executions>
<execution>
<id>sign-artifacts</id>
<phase>verify</phase>
<goals>
<goal>sign</goal>
</goals>
</execution>
</executions>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-source-plugin</artifactId>
<version>3.2.1</version>
<executions>
<execution>
<id>attach-sources</id>
<goals>
<goal>jar-no-fork</goal>
</goals>
</execution>
</executions>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-javadoc-plugin</artifactId>
<version>3.5.0</version>
<executions>
<execution>
<id>attach-javadocs</id>
<goals>
<goal>jar</goal>
</goals>
</execution>
</executions>
</plugin>
</plugins>
</build>
</project>

Step 4: Settings.xml Configuration

<!-- ~/.m2/settings.xml -->
<settings>
<servers>
<server>
<id>ossrh</id>
<username>your-jira-username</username>
<password>your-jira-password</password>
</server>
</servers>
</settings>

Step 5: Deploy

# Deploy to staging repository
mvn clean deploy
# Then login to https://s01.oss.sonatype.org/
# Find your staging repository, verify contents, and release

Pros of Maven Central

• Industry Standard: Default repository for all major build tools
• Permanence: Artifacts are permanent and never deleted
• Discovery: Libraries are easily discoverable
• Trust: Curated process ensures quality and security
• Long-term Support: Ideal for enterprise and production use

Cons of Maven Central

• Complex Setup: Multi-step process with manual approval
• Slow Initial Setup: Can take days to get approved
• Rigid Process: Requires specific metadata and signing
• Manual Releases: Each release requires deployment steps

JitPack

What is JitPack?

JitPack is a novel approach to Maven repository hosting that builds your artifacts directly from Git repositories (GitHub, GitLab, Bitbucket) on-demand.

Publishing with JitPack

Method 1: Automatic (Zero Configuration)

// In consumer's build.gradle
repositories {
maven { url 'https://jitpack.io' }
}
dependencies {
implementation 'com.github.Username:Repository:Tag'
}

Method 2: With jitpack.yml Configuration
Create jitpack.yml in your repository root:

jdk:
- openjdk17
before_install:
- sdk use java 17.0.2-open
install:
- ./gradlew publishToMavenLocal
# Or for Maven:
# install: mvn install -DskipTests=true

Method 3: Multi-module Projects

# jitpack.yml for multi-module build
jdk:
- openjdk17
install:
- cd my-submodule
- mvn install -DskipTests=true

Usage Examples

GitHub Repository:

// Specific tag
implementation 'com.github.jitpack:gradle-simple:1.1'
// Specific commit
implementation 'com.github.jitpack:gradle-simple:acb1234'
// Branch
implementation 'com.github.jitpack:gradle-simple:main-SNAPSHOT'

Private Repositories:

repositories {
maven {
url 'https://jitpack.io'
credentials { 
username = System.getenv('GITHUB_TOKEN') 
}
}
}

Pros of JitPack

• Zero Configuration: Works automatically for most projects
• Instant Publishing: No manual deployment needed
• Git Integration: Versions match your Git tags/commits/branches
• Great for Prototyping: Perfect for sharing work in progress
• Simple for Consumers: Easy to depend on any Git repository
• Free for Public Repos: No cost for open source projects

Cons of JitPack

• Build Reliability: Dependent on JitPack's build infrastructure
• No Artifact Permanence: Builds can fail if dependencies change
• Limited Control: Less control over build environment
• Not Standard: Some enterprises block non-standard repositories
• Slower First Build: First request for a version triggers a build
• Limited Metadata: Less metadata and curation than Maven Central

Detailed Comparison

Setup and Maintenance

// Maven Central: Complex setup but done once
// ≈ 2-3 days initial setup, then per-release:
mvn clean deploy 
+ manual staging release
// JitPack: No setup, but per-version builds
// Just push to Git, consumers can immediately use
implementation 'com.github.user:repo:tag'

Versioning

// Maven Central - Semantic versioning
implementation 'com.company:library:1.2.3'
// JitPack - Git-based versioning  
implementation 'com.github.company:library:1.2.3'        // Tag
implementation 'com.github.company:library:abc1234'      // Commit
implementation 'com.github.company:library:main-SNAPSHOT' // Branch

Enterprise Considerations

// Maven Central
+ Enterprise-approved
+ Behind corporate firewalls
+ Signed artifacts
+ Long-term availability guarantee
// JitPack  
- May be blocked by security policies
- External build dependency
- No artifact signing guarantee

When to Choose Which?

Choose Maven Central When:

• Production Libraries: Your library will be used in production systems
• Enterprise Environment: Your users are in corporate environments
• Long-term Support: You need guaranteed long-term availability
• Professional Distribution: You want the industry standard approach
• Signed Artifacts: You need cryptographically signed releases

Choose JitPack When:

• Quick Sharing: Sharing prototypes or work-in-progress
• Internal Tools: Company-internal libraries not for public distribution
• Open Source Experiments: Testing library ideas with the community
• Simple Projects: Small projects where Maven Central is overkill
• Rapid Iteration: Frequently changing libraries with quick feedback cycles

Migration Path

Many successful libraries start with JitPack and migrate to Maven Central:

1. Phase 1: Use JitPack for early development and feedback
2. Phase 2: Gather users and refine the API
3. Phase 3: Apply for Maven Central while maintaining JitPack
4. Phase 4: Announce migration and deprecate JitPack version

Dual Publishing Example

// Users can choose:
repositories {
mavenCentral()
maven { url 'https://jitpack.io' } // Fallback
}
dependencies {
// Primary - Maven Central
implementation 'com.company:library:1.0.0'
// Fallback - JitPack (same version)
// implementation 'com.github.company:library:1.0.0'
}

Best Practices

For Maven Central:

• Use semantic versioning strictly
• Sign all artifacts with GPG
• Provide comprehensive Javadoc
• Include source jars
• Maintain proper changelogs
• Set up CI/CD for automated releases

For JitPack:

• Use meaningful Git tags (v1.0.0, not random names)
• Provide a jitpack.yml for complex builds
• Test the JitPack build by depending on your own library
• Monitor build status on jitpack.io
• Use branches for snapshots, tags for releases

Conclusion

Maven Central is the professional choice for production-ready libraries that need permanence, trust, and wide adoption. Its rigorous process ensures quality but requires significant setup effort.

JitPack is the pragmatic choice for quick sharing, prototyping, and internal use. Its Git-native approach eliminates publishing overhead but lacks the permanence and enterprise acceptance of Maven Central.

Many successful projects leverage both: starting with JitPack for rapid iteration and graduating to Maven Central as they mature. The right choice depends on your project's stage, audience, and long-term goals.