How to Build Specific Maven Modules in Multi-Module Projects?

Building Specific Maven Modules in Multi-Module Projects

In Maven projects with multiple modules, compiling all sub-modules is straightforward using mvn compile. However, selective operations on individual modules pose challenges.

Problem:
When attempting to package a WAR file for module B in a project with modules A (dependency) and C (war project), Maven reports dependency resolution errors for A.

Solution:
Maven Advanced Reactor Options provide a solution:

• -pl, --projects: Specify specific modules to build (e.g., B).
• -am, --also-make: Include dependencies of specified modules (e.g., A).

Steps:

1. Navigate to the parent project directory (P).

2. Execute the following command:

   mvn install -pl B -am

This will build module B and its dependency A.

Additional Note:
If the artifactId of a module differs from its directory name, use a colon in the command:

mvn install -pl :B -am

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