desruisseaux commented on code in PR #11505:
URL: https://github.com/apache/maven/pull/11505#discussion_r2584823322


##########
impl/maven-core/src/main/java/org/apache/maven/project/DefaultProjectBuilder.java:
##########
@@ -700,11 +709,149 @@ private void initProject(MavenProject project, 
ModelBuilderResult result) {
                 if (!hasTest) {
                     
project.addTestCompileSourceRoot(build.getTestSourceDirectory());
                 }
-                for (Resource resource : 
project.getBuild().getDelegate().getResources()) {
-                    project.addSourceRoot(new DefaultSourceRoot(baseDir, 
ProjectScope.MAIN, resource));
+                // Extract modules from sources to detect modular projects
+                Set<String> modules = extractModules(sources);
+                boolean isModularProject = !modules.isEmpty();
+
+                logger.debug(
+                        "Module detection for project {}: found {} module(s) 
{} - modular project: {}",
+                        project.getId(),
+                        modules.size(),
+                        modules,
+                        isModularProject);
+
+                /*
+                 * Handle main resources - modular project has highest 
priority:
+                 * 1. Modular project: use resources from <sources> if 
present, otherwise inject defaults
+                 * 2. Classic project: use resources from <sources> if 
present, otherwise use legacy <resources>
+                 */
+                List<Resource> resources = 
project.getBuild().getDelegate().getResources();
+                if (isModularProject) {
+                    if (hasMainResources) {
+                        // Modular project with resources configured via 
<sources> - already added above
+                        if (!resources.isEmpty()
+                                && !hasOnlySuperPomDefaults(resources, 
baseDir, ProjectScope.MAIN.id())) {
+                            logger.warn("Legacy <resources> element is ignored 
because main resources are "
+                                    + "configured via 
<source><lang>resources</lang></source> in <sources>");
+                        }
+                        logger.debug(
+                                "Main resources configured via <sources> 
element, ignoring legacy <resources> element");
+                    } else {
+                        // Modular project without resources in <sources> - 
inject module-aware defaults
+                        if (!resources.isEmpty()

Review Comment:
   Unnecessary check for `resources.isEmpty()` (see above comment).



##########
impl/maven-core/src/main/java/org/apache/maven/project/DefaultProjectBuilder.java:
##########
@@ -700,11 +709,149 @@ private void initProject(MavenProject project, 
ModelBuilderResult result) {
                 if (!hasTest) {
                     
project.addTestCompileSourceRoot(build.getTestSourceDirectory());
                 }
-                for (Resource resource : 
project.getBuild().getDelegate().getResources()) {
-                    project.addSourceRoot(new DefaultSourceRoot(baseDir, 
ProjectScope.MAIN, resource));
+                // Extract modules from sources to detect modular projects
+                Set<String> modules = extractModules(sources);
+                boolean isModularProject = !modules.isEmpty();
+
+                logger.debug(
+                        "Module detection for project {}: found {} module(s) 
{} - modular project: {}",
+                        project.getId(),
+                        modules.size(),
+                        modules,
+                        isModularProject);
+
+                /*
+                 * Handle main resources - modular project has highest 
priority:
+                 * 1. Modular project: use resources from <sources> if 
present, otherwise inject defaults
+                 * 2. Classic project: use resources from <sources> if 
present, otherwise use legacy <resources>
+                 */
+                List<Resource> resources = 
project.getBuild().getDelegate().getResources();
+                if (isModularProject) {
+                    if (hasMainResources) {
+                        // Modular project with resources configured via 
<sources> - already added above
+                        if (!resources.isEmpty()
+                                && !hasOnlySuperPomDefaults(resources, 
baseDir, ProjectScope.MAIN.id())) {
+                            logger.warn("Legacy <resources> element is ignored 
because main resources are "
+                                    + "configured via 
<source><lang>resources</lang></source> in <sources>");
+                        }
+                        logger.debug(
+                                "Main resources configured via <sources> 
element, ignoring legacy <resources> element");
+                    } else {
+                        // Modular project without resources in <sources> - 
inject module-aware defaults
+                        if (!resources.isEmpty()
+                                && !hasOnlySuperPomDefaults(resources, 
baseDir, ProjectScope.MAIN.id())) {
+                            String message =
+                                    "Legacy <resources> element is ignored 
because modular sources are configured. "
+                                            + "Use 
<source><lang>resources</lang></source> in <sources> for custom resource 
paths.";
+                            logger.warn(message);
+                            result.getProblemCollector()
+                                    .reportProblem(new 
org.apache.maven.impl.model.DefaultModelProblem(
+                                            message,
+                                            Severity.WARNING,
+                                            Version.V41,
+                                            project.getModel().getDelegate(),
+                                            -1,
+                                            -1,
+                                            null));
+                        }
+                        logger.debug("Injecting module-aware main resource 
roots for {} modules", modules.size());
+                        for (String module : modules) {
+                            Path resourcePath = baseDir.resolve("src")
+                                    .resolve(module)
+                                    .resolve(ProjectScope.MAIN.id())
+                                    .resolve("resources");
+                            logger.debug("  - Adding main resource root: {} 
(module: {})", resourcePath, module);
+                            project.addSourceRoot(
+                                    createModularResourceRoot(baseDir, module, 
ProjectScope.MAIN, outputDirectory));
+                        }
+                    }
+                } else {
+                    // Classic (non-modular) project
+                    if (hasMainResources) {
+                        // Resources configured via <sources> - already added 
above
+                        if (!resources.isEmpty()

Review Comment:
   Unnecessary check for `resources.isEmpty()` (see above comment).



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