In Maven, when does a project become part of the reactor?

Question

I was just reading the source code for the Versions Maven Plugin, and noticed this snippet of code:

   if ( reactorProjects.contains( getProject().getParent() ) )
   {
       getLog().info( "Project's parent is part of the reactor" );
       return;
   }

In general, when does a project (or the parent of a project) become part of the reactor and what are the implications of this?

score 0 · Accepted Answer · answered Aug 07 '14 at 11:52

I asked this question on the Maven mailing list as well. Looks like by default the parent project is always a part of the reactor. However, by passing some options to Maven it might be excluded from the reactor during a build, such as:

When you use -pl to restrict the reactor
when you use -f to build a specific pom

In Maven, when does a project become part of the reactor?

1 Answers1