ascheman commented on code in PR #11702:
URL: https://github.com/apache/maven/pull/11702#discussion_r2802884373


##########
impl/maven-core/src/main/java/org/apache/maven/project/DefaultProjectBuilder.java:
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@@ -693,27 +693,27 @@ private void initProject(MavenProject project, 
ModelBuilderResult result) {
 
                 /*
                  * `sourceDirectory`, `testSourceDirectory` and 
`scriptSourceDirectory`
-                 * are ignored if the POM file contains at least one enabled 
<source> element
+                 * are not used if the POM file contains at least one enabled 
<source> element

Review Comment:
   OK, I fully agree that we should not require something on the Super POM by 
now but just use the classic directories as fallback if nothing is explicitly 
configured. Nevertheless, I will create a new Acceptance Criterion to express 
that design choice - we are back at (another) AC9 then 😉:
   
   ## AC9 Definition (Non-Modular Projects)
   
   **AC9** (Legacy directory handling for non-modular projects):
   
   For **non-modular projects** using `<sources>`:
   
   1. **When `<sources>` has Java for a scope**: Legacy directories are 
rejected if they differ from the default (explicit configuration detected)
   2. **When `<sources>` has no Java for a scope**: Legacy directories are used 
as **implicit fallback** only if they match the default (could be inherited)
   
   _I already made some progress implementing and testing this and will deliver 
test cases for both AC8 and AC9_



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