MartinKanters commented on a change in pull request #446:
URL: https://github.com/apache/maven/pull/446#discussion_r577045936



##########
File path: 
maven-core/src/main/java/org/apache/maven/graph/DefaultGraphBuilder.java
##########
@@ -242,21 +274,17 @@ public DefaultGraphBuilder( BuildResumptionDataRepository 
buildResumptionDataRep
     {
         List<MavenProject> result = projects;
 
-        if ( !request.getExcludedProjects().isEmpty() )
+        ProjectActivation projectActivation = request.getProjectActivation();
+        Set<String> requiredSelectors = 
projectActivation.getRequiredInactiveProjectSelectors();
+        Set<String> optionalSelectors = 
projectActivation.getOptionalInactiveProjectSelectors();
+        if ( !requiredSelectors.isEmpty() || !optionalSelectors.isEmpty() )
         {
-            File reactorDirectory = getReactorDirectory( request );
+            Set<MavenProject> excludedProjects = new HashSet<>( 
requiredSelectors.size() + optionalSelectors.size() );
+            excludedProjects.addAll( getProjectsBySelectors( request, 
projects, requiredSelectors, true ) );
+            excludedProjects.addAll( getProjectsBySelectors( request, 
projects, optionalSelectors, false ) );

Review comment:
       I agree, but I don't think I understand how it would ideally work. Would 
you want to let `-a,+:a` work the same way as `-a,+a` instead of have the 
exception thrown? (last one wins)




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