desruisseaux commented on code in PR #11702:
URL: https://github.com/apache/maven/pull/11702#discussion_r2777394451


##########
impl/maven-core/src/main/java/org/apache/maven/project/DefaultProjectBuilder.java:
##########
@@ -906,15 +906,17 @@ private void initProject(MavenProject project, 
ModelBuilderResult result) {
         }
 
         /**
-         * Warns about legacy directory usage in a modular project. Two cases 
are handled:
+         * Fails the build if a legacy directory is present in a modular 
project.
+         * <p>
+         * "Present" means either:
          * <ul>
-         *   <li>Case 1: The default legacy directory exists on the filesystem 
(e.g., src/main/java exists)</li>
-         *   <li>Case 2: An explicit legacy directory is configured that 
differs from the default</li>
+         *   <li><b>Configuration presence</b>: an explicit configuration 
differs from the default</li>
+         *   <li><b>Physical presence</b>: the default directory exists on the 
filesystem</li>
          * </ul>
-         * Legacy directories are unconditionally ignored in modular projects 
because it is not clear
-         * how to dispatch their content between different modules.
+         * In both cases, the legacy directory conflicts with modular sources 
and must not be used.

Review Comment:
   > not "and must not be used" but rather the complete build fails.
   
   Isn't what the next line below is saying?



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