code: @Override
      public void execute()
      {
          if ( "pom".equals( project.getPackaging() ) )
          {
              return;
          }
  
          File managedPath = new File( project.getBuild().getDirectory(), "src_managed" );
          String managedPathStr = managedPath.getAbsolutePath();
          if ( !project.getCompileSourceRoots().contains( managedPathStr ) )
          {
              project.addCompileSourceRoot( managedPathStr );
              getLog().debug( "Added source directory: " + managedPathStr );
          }
      }
docs: Adds default SBT managed sources location to Maven project.
  
  <code>${project.build.directory}/src_managed</code> is added to project's compile source roots