desruisseaux commented on code in PR #2278:
URL: https://github.com/apache/maven/pull/2278#discussion_r2082405722


##########
api/maven-api-core/src/main/java/org/apache/maven/api/SourceRoot.java:
##########
@@ -37,11 +37,23 @@ public interface SourceRoot {
      * The path is relative to the <abbr>POM</abbr> file.
      *
      * <h4>Default implementation</h4>
-     * The default value is <code>src/{@linkplain #scope() scope}/{@linkplain 
#language() language}</code>
-     * as a relative path. Implementation classes may override this default 
with an absolute path instead.
+     * The default value depends on whether a {@linkplain #module() module 
name} is specified in this source root:
+     * <ul>
+     *   <li>
+     *     If no module name, then the default directory is

Review Comment:
   Indeed, the rational is as Guillaume said. While we try to avoid disruption 
for users who are not interested in JPMS, those who want to embrace fully JPMS 
will have to change some habits anyway, some of them out of our control (e.g., 
the directory layout of `javac` output).
   
   There is a difficulty with resources, which are considered as a language and 
therefore would be stored apart with a `src/${lang}/${module}/${scope}` layout 
if the users do not specify the directory themselves. An alternative staying 
closer to current Maven practice may be `src/${module}/${scope}/${lang}`.



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