ascheman commented on code in PR #11702:
URL: https://github.com/apache/maven/pull/11702#discussion_r2818303469
##########
impl/maven-core/src/main/java/org/apache/maven/project/DefaultProjectBuilder.java:
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@@ -692,49 +692,102 @@ private void initProject(MavenProject project,
ModelBuilderResult result) {
}
/*
- * `sourceDirectory`, `testSourceDirectory` and
`scriptSourceDirectory`
- * are ignored if the POM file contains at least one enabled
<source> element
- * for the corresponding scope and language. This rule exists
because
- * Maven provides default values for those elements which may
conflict
- * with user's configuration.
+ * Source directory handling depends on project type and
<sources> configuration:
*
- * Additionally, for modular projects, legacy directories are
unconditionally
- * ignored because it is not clear how to dispatch their
content between
- * different modules. A warning is emitted if these properties
are explicitly set.
+ * 1. CLASSIC projects (no <sources>):
+ * - All legacy directories are used
+ *
+ * 2. MODULAR projects (have <module> in <sources>):
+ * - ALL legacy directories are rejected (can't dispatch
between modules)
+ * - Physical presence of default directories
(src/main/java) also triggers ERROR
+ *
+ * 3. NON-MODULAR projects with <sources>:
+ * - Explicit legacy directories (differ from default) are
always rejected
+ * - If <sources> has Java for a scope: legacy is not used
(even if matching default)
+ * - If <sources> has no Java for a scope: legacy is used
as implicit fallback
Review Comment:
Same commit (a5ad905). Reworded to "Legacy directories for scopes where
`<sources>` has no Java serve as implicit fallback (only if they match the
default, e.g., inherited)".
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