How Do I Retrieve Source JARs from Maven Repositories?

Retrieving Source JARs from Maven Repositories

When working with Maven repositories, one may encounter the need to access the source JARs of dependencies. While the presence of source JARs in repositories is not guaranteed, there are methods to facilitate their acquisition.

Maven Dependency Plugin

The Maven Dependency Plugin provides a solution for retrieving source code and Javadocs for dependencies. To obtain the source JARs, execute the following command:

mvn dependency:sources

Using this command, Maven will attempt to download the source code for dependencies specified in the project's POM file.

Retrieving Javadocs

In addition to source code, Javadocs can also be obtained using the Dependency Plugin:

mvn dependency:resolve -Dclassifier=javadoc

This command will attempt to download Javadocs for the dependencies.

Limitations

It's important to note that the availability of source JARs and Javadocs depends on the packaging efforts of library maintainers. Some libraries may not provide these resources, so the specified commands may not always succeed.

Excluding/Including Artifacts

To optimize the process when working with numerous dependencies, specific artifacts can be excluded or included using the following formats:

mvn dependency:sources -DexcludeArtifactIds=artifact1,artifact2
mvn dependency:sources -DincludeArtifactIds=guava,commons-lang

By specifying artifact IDs, only the source JARs for the selected dependencies will be retrieved, reducing the download time and file size.

Additional Resources

• Maven Micro-Tip: Get sources and Javadocs: https://tedwise.com/2010/01/27/maven-micro-tip-get-sources-and-javadocs/
• Maven Dependency Plugin Sources Mojo: https://maven.apache.org/plugins/maven-dependency-plugin/sources-mojo.html

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