How to Build a Specific Module in a Maven Multi-Module Project?

Building a Specific Module in a Maven Multi-Module Project

Building individual modules in a Maven project, particularly those with dependencies, can pose challenges. Consider a scenario where you have a parent project (P) and three sub-modules: A, B, and C. While compiling all modules is achievable with mvn compile, building specific modules raises questions.

To package a war for project B, running mvn package from the B directory fails due to missing dependencies. This scenario raises the following concerns:

1. Is it necessary to package the entire project hierarchy for a single module?
2. Should snapshots of dependent modules be installed locally before packaging?

Best Practices: Utilizing Maven Advanced Reactor Options

To address these challenges, leverage Maven's advanced reactor options:

• -pl, --projects: Specify the specific reactor projects to build.
• -am, --also-make: Include projects required by the specified projects.

Solution:

Navigate to the parent P directory and execute the following command:

mvn install -pl B -am

This command will build both B and its required modules.

Note: If the artifactId differs from the directory name, use a colon in the command:

mvn install -pl :B -am

Refer to the resources below for further guidance:

• [Define modules list which shall be build in Maven multiproject build](LINK)

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