SCANGRADLE-305 : FIX Gradle scanner 7.0+ SonarTask now triggers compilation

src/main/java/org/sonarqube/gradle/SonarQubePlugin.java

@@ -21,6 +21,7 @@
 
 import java.io.File;
 import java.util.ArrayList;
+import java.util.Collections;
 import java.util.Collection;
 import java.util.HashMap;
 import java.util.List;
@@ -137,7 +138,6 @@ private static List<File> registerAndConfigureResolverTasks(Project topLevelProj
         }
         DirectoryProperty buildDirectory = target.getLayout().getBuildDirectory();
         File localSonarResolver = new File(buildDirectory.getAsFile().get(), "sonar-resolver");
-        localSonarResolver.mkdirs();
         task.setOutputDirectory(localSonarResolver);
         resolverFiles.add(task.getOutputFile());
         // Android uses JetifyTransform to translate and ensure compatibility for specific deprecated libraries.
@@ -187,7 +187,22 @@ private static void configureTask(SonarTask sonarTask, Project project, Map<Stri
     sonarTask.mustRunAfter(getAndroidTasks(project));
     sonarTask.mustRunAfter(getJavaTestTasks(project));
     sonarTask.mustRunAfter(getJacocoTasks(project));
-    sonarTask.dependsOn(getClassPathResolverTask(project));
+    if (isSkipCompile(project)) {
+      LOGGER.info("sonar.gradle.skipCompile is enabled. The sonar task will not depend on sonarResolver tasks.");
+      sonarTask.mustRunAfter(getClassPathResolverTask(project));
+      sonarTask.setResolverFiles(Collections.emptyList());
+    } else {
+      sonarTask.dependsOn(getClassPathResolverTask(project));
+    }
+  }
+
+  private static boolean isSkipCompile(Project project) {
+    String sysProp = System.getProperty("sonar.gradle.skipCompile");
+    if ("true".equalsIgnoreCase(sysProp)) {
+      return true;
+    }
+    Object projectProp = project.findProperty("sonar.gradle.skipCompile");
+    return projectProp != null && "true".equalsIgnoreCase(projectProp.toString());
   }
 
   private static boolean isGradleVersionGreaterOrEqualTo(String version) {

src/main/java/org/sonarqube/gradle/SonarResolverTask.java

@@ -154,6 +154,8 @@ void run() throws IOException {
       return;
     }
 
+    outputDirectory.mkdirs();
+
     String displayName = getProjectName();
     if (LOGGER.isLoggable(Level.INFO)) {
       LOGGER.info("Resolving properties for " + displayName + ".");

src/test/groovy/org/sonarqube/gradle/SonarQubePluginTest.groovy

@@ -846,6 +846,25 @@ class SonarQubePluginTest extends Specification {
     mustRunAfterTasks(sonarTask).containsAll(["root:test", "root:compileJava", "root:compileTestJava"])
   }
 
+  def "The sonar task should have no dependency when skipCompile is enabled"() {
+    setup:
+    System.setProperty("sonar.gradle.skipCompile", "true")
+    def rootProject = ProjectBuilder.builder().withName("root").build()
+    rootProject.pluginManager.apply(JavaPlugin)
+
+    when:
+    rootProject.pluginManager.apply(SonarQubePlugin)
+
+    then:
+    def sonarTask = rootProject.tasks.sonar
+    dependsOnTasks(sonarTask) == []
+    mustRunAfterTasks(sonarTask).size() == 4
+    mustRunAfterTasks(sonarTask).containsAll(["root:test", "root:compileJava", "root:compileTestJava", "root:sonarResolver"])
+
+    cleanup:
+    System.clearProperty("sonar.gradle.skipCompile")
+  }
+
   private List<String> mustRunAfterTasks(Task sonarTask) {
     sonarTask.getMustRunAfter().getDependencies(sonarTask)
       .stream()