Log as debug when sources are defined but missing in non-leaf

sonar-scanner-engine/src/main/java/org/sonar/scanner/scan/ProjectReactorBuilder.java

@@ -333,6 +333,8 @@ public class ProjectReactorBuilder {
     if (project.getSubProjects().isEmpty()) {
       cleanAndCheckModuleProperties(project);
     } else {
+      logMissingSourcesAndTests(project);
+
       // clean modules properties as well
       for (ProjectDefinition module : project.getSubProjects()) {
         cleanAndCheckProjectDefinitions(module);
@@ -340,6 +342,23 @@ public class ProjectReactorBuilder {
     }
   }
 
+  private static void logMissingSourcesAndTests(ProjectDefinition project) {
+    Map<String, String> properties = project.properties();
+
+    File baseDir = project.getBaseDir();
+    logMissingPaths("source", baseDir, getListFromProperty(properties, PROPERTY_SOURCES));
+    logMissingPaths("test", baseDir, getListFromProperty(properties, PROPERTY_TESTS));
+  }
+
+  private static void logMissingPaths(String label, File baseDir, String[] paths) {
+    for (String path : paths) {
+      File file = resolvePath(baseDir, path);
+      if (!file.exists()) {
+        LOG.debug("Path '{}' does not exist, will not be used as {}", file, label);
+      }
+    }
+  }
+
   @VisibleForTesting
   protected static void cleanAndCheckModuleProperties(ProjectDefinition project) {
     Map<String, String> properties = project.properties();

sonar-scanner-engine/src/test/java/org/sonar/scanner/scan/ProjectReactorBuilderTest.java

@@ -62,7 +62,7 @@ public class ProjectReactorBuilderTest {
   }
 
   @Test
-  public void shouldFailIfUnexistingSourceDirectory() {
+  public void should_fail_if_sources_are_missing_in_leaf_module() {
     thrown.expect(MessageException.class);
     thrown.expectMessage("The folder 'unexisting-source-dir' does not exist for 'com.foo.project' (base directory = "
       + getResource(this.getClass(), "simple-project-with-unexisting-source-dir") + ")");
@@ -70,6 +70,11 @@ public class ProjectReactorBuilderTest {
     loadProjectDefinition("simple-project-with-unexisting-source-dir");
   }
 
+  @Test
+  public void should_not_fail_if_sources_are_missing_in_intermediate_module() {
+    loadProjectDefinition("multi-module-pom-in-root");
+  }
+
   @Test
   public void fail_if_sources_not_set() {
     thrown.expect(MessageException.class);
@@ -568,10 +573,9 @@ public class ProjectReactorBuilderTest {
     assertThat(rootProject.getName()).isEqualTo("Foo Project");
     assertThat(rootProject.getVersion()).isEqualTo("1.0-SNAPSHOT");
     assertThat(rootProject.getDescription()).isEqualTo("Description of Foo Project");
-    // root project must not contain some properties - even if they are defined in the root properties file
     assertThat(rootProject.sources().contains("sources")).isTrue();
     assertThat(rootProject.tests().contains("tests")).isTrue();
-    // and module properties must have been cleaned
+    // Module properties must have been cleaned
     assertThat(rootProject.properties().get("module1.sonar.projectKey")).isNull();
     assertThat(rootProject.properties().get("module2.sonar.projectKey")).isNull();
     // Check baseDir and workDir