Maven build second level+ child projects using reactor option -pl

Question

My maven project structure is as below

Project A 
  pom.xml
  - ProjectB
    pom.xml
    - ProjectC
      pom.xml
    - ProjectD
      pom.xml
  - ProjectY
    p         


        

Answer 1

This is an answer from a similar question that is also relevant here.
By using artifactIds you don't have to know the structure of your project.

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If you only use the artifactIds of the given project you have to define that correctly on command line:

help output of Maven (mvn --help)

Comma-delimited list of specified reactor projects to build of all projects. A project can be specified by [groupId]:artifactId or by its relative path

This means in your case you have to define:

mvn clean install --projects :projectC,:ProjectY

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Notice the : that is prepended to the artifactIds to indicate you omit the groupId