SONARJAVA-4650 S6817: Use of the @Async annotation on methods declare…

its/ruling/src/test/java/org/sonar/java/it/AutoScanTest.java

@@ -180,15 +180,15 @@ public void javaCheckTestSources() throws Exception {
     softly.assertThat(newTotal).isEqualTo(knownTotal);
     softly.assertThat(rulesCausingFPs).hasSize(6);
     softly.assertThat(rulesNotReporting).hasSize(7);
-    softly.assertThat(rulesSilenced).hasSize(76);
+    softly.assertThat(rulesSilenced).hasSize(77);
 
     /**
      * 4. Check total number of differences (FPs + FNs)
      *
      * No differences would mean that we find the same issues with and without the bytecode and libraries
      */
     String differences = Files.readString(pathFor(TARGET_ACTUAL + PROJECT_KEY + "-no-binaries_differences"));
-    softly.assertThat(differences).isEqualTo("Issues differences: 3481");
+    softly.assertThat(differences).isEqualTo("Issues differences: 3483");
 
     softly.assertAll();
   }

its/ruling/src/test/resources/autoscan/autoscan-diff-by-rules.json

@@ -2909,6 +2909,12 @@
     "falseNegatives": 5,
     "falsePositives": 0
   },
+  {
+    "ruleKey": "S6817",
+    "hasTruePositives": false,
+    "falseNegatives": 2,
+    "falsePositives": 0
+  },
   {
     "ruleKey": "S6818",
     "hasTruePositives": false,

java-checks-test-sources/src/main/java/checks/spring/AsyncMethodsOnConfigurationClassCheck.java

@@ -0,0 +1,32 @@
+package checks.spring;
+
+import javax.annotation.Nullable;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.scheduling.annotation.Async;
+
+@Configuration
+public class AsyncMethodsOnConfigurationClassCheck {
+
+  @Async // Noncompliant [[sc=3;ec=9;quickfixes=qf1]] {{Remove this "@Async" annotation from this method.}}
+  // fix@qf1 {{Remove "@Async"}}
+  // edit@qf1 [[sc=3;ec=9]] {{}}
+  public void asyncMethod() {
+  }
+
+  public void method() { // Compliant
+  }
+
+  @Nullable
+  @Async // Noncompliant
+  public void someMethod() {
+  }
+
+}
+
+class NotAConfigurationClass {
+
+  @Async // Compliant
+  public void asyncMethod() {
+  }
+
+}

java-checks/src/main/java/org/sonar/java/checks/CheckList.java

@@ -136,12 +136,13 @@
 import org.sonar.java.checks.serialization.SerializableObjectInSessionCheck;
 import org.sonar.java.checks.serialization.SerializableSuperConstructorCheck;
 import org.sonar.java.checks.spring.AsyncMethodsCalledViaThisCheck;
+import org.sonar.java.checks.spring.AsyncMethodsOnConfigurationClassCheck;
 import org.sonar.java.checks.spring.AsyncMethodsReturnTypeCheck;
-import org.sonar.java.checks.spring.AutowiredOnMultipleConstructorsCheck;
 import org.sonar.java.checks.spring.AutowiredOnConstructorWhenMultipleConstructorsCheck;
+import org.sonar.java.checks.spring.AutowiredOnMultipleConstructorsCheck;
 import org.sonar.java.checks.spring.ControllerWithSessionAttributesCheck;
-import org.sonar.java.checks.spring.ModelAttributeNamingConventionForSpELCheck;
 import org.sonar.java.checks.spring.FieldDependencyInjectionCheck;
+import org.sonar.java.checks.spring.ModelAttributeNamingConventionForSpELCheck;
 import org.sonar.java.checks.spring.OptionalRestParametersShouldBeObjectsCheck;
 import org.sonar.java.checks.spring.PersistentEntityUsedAsRequestParameterCheck;
 import org.sonar.java.checks.spring.RequestMappingMethodPublicCheck;
@@ -283,6 +284,7 @@ public final class CheckList {
     AssertionsInProductionCodeCheck.class,
     AssertsOnParametersOfPublicMethodCheck.class,
     AsyncMethodsCalledViaThisCheck.class,
+    AsyncMethodsOnConfigurationClassCheck.class,
     AsyncMethodsReturnTypeCheck.class,
     AtLeastOneConstructorCheck.class,
     AuthorizationsStrongDecisionsCheck.class,
@@ -945,8 +947,7 @@ public final class CheckList {
     UnusedPrivateFieldCheck.class,
     VerifiedServerHostnamesCheck.class,
     VolatileNonPrimitiveFieldCheck.class,
-    WeakSSLContextCheck.class
-  );
+    WeakSSLContextCheck.class);
 
   private CheckList() {
   }

java-checks/src/main/java/org/sonar/java/checks/spring/AsyncMethodsOnConfigurationClassCheck.java

@@ -0,0 +1,64 @@
+/*
+ * SonarQube Java
+ * Copyright (C) 2012-2023 SonarSource SA
+ * mailto:info AT sonarsource DOT com
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 3 of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this program; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+ */
+package org.sonar.java.checks.spring;
+
+import java.util.List;
+import org.sonar.check.Rule;
+import org.sonar.java.checks.helpers.QuickFixHelper;
+import org.sonar.java.reporting.JavaQuickFix;
+import org.sonar.java.reporting.JavaTextEdit;
+import org.sonar.plugins.java.api.IssuableSubscriptionVisitor;
+import org.sonar.plugins.java.api.tree.ClassTree;
+import org.sonar.plugins.java.api.tree.MethodTree;
+import org.sonar.plugins.java.api.tree.Tree;
+
+@Rule(key = "S6817")
+public class AsyncMethodsOnConfigurationClassCheck extends IssuableSubscriptionVisitor {
+
+  @Override
+  public List<Tree.Kind> nodesToVisit() {
+    return List.of(Tree.Kind.CLASS);
+  }
+
+  @Override
+  public void visitNode(Tree tree) {
+    ClassTree classTree = (ClassTree) tree;
+    boolean isConfiguration = classTree.modifiers().annotations().stream()
+      .anyMatch(annotation -> annotation.annotationType().symbolType().is("org.springframework.context.annotation.Configuration"));
+
+    if (isConfiguration) {
+      classTree.members().stream()
+        .filter(member -> member.is(Tree.Kind.METHOD))
+        .map(MethodTree.class::cast)
+        .forEach(member -> member.modifiers().annotations().stream()
+          .filter(annotation -> annotation.annotationType().symbolType().is("org.springframework.scheduling.annotation.Async"))
+          .findFirst()
+          .ifPresent(annotation -> QuickFixHelper.newIssue(context)
+            .forRule(this)
+            .onTree(annotation)
+            .withMessage("Remove this \"@Async\" annotation from this method.")
+            .withQuickFix(() -> JavaQuickFix.newQuickFix("Remove \"@Async\"")
+              .addTextEdit(JavaTextEdit.removeTree(annotation))
+              .build())
+            .report()));
+    }
+  }
+
+}

java-checks/src/main/resources/org/sonar/l10n/java/rules/java/S6817.html

@@ -0,0 +1,51 @@
+<h2>Why is this an issue?</h2>
+<p><code>@Configuration</code> is a class-level annotation indicating that an object is a source of bean definitions. <code>@Configuration</code>
+classes declare beans through <code>@Bean</code>-annotated methods. Calls to <code>@Bean</code> methods on <code>@Configuration</code> classes can
+also be used to define inter-bean dependencies. The <code>@Bean</code> annotation indicates that a method instantiates, configures, and initializes a
+new object to be managed by the Spring IoC container.</p>
+<p>Annotating a method of a bean with <code>@Async</code> will make it execute in a separate thread. In other words, the caller will not wait for the
+completion of the called method.</p>
+<p>The <code>@Async</code> annotation is not supported on methods declared within a <code>@Configuration</code> class. This is because
+<code>@Async</code> methods are typically used for asynchronous processing, and they require certain infrastructure to be set up, which may not be
+available or appropriate in a <code>@Configuration</code> class.</p>
+<h2>How to fix it</h2>
+<p>Don’t use <code>@Async</code> annotations on methods of <code>@Configuration</code> classes.</p>
+<h3>Code examples</h3>
+<h4>Noncompliant code example</h4>
+<pre data-diff-id="1" data-diff-type="noncompliant">
+@EnableAsync
+@Configuration
+public class MyConfiguration {
+
+  @Async // Noncompliant - This is not allowed
+  public void asyncMethod() {
+    // ...
+  }
+}
+</pre>
+<h4>Compliant solution</h4>
+<pre data-diff-id="1" data-diff-type="compliant">
+@EnableAsync
+@Configuration
+public class MyConfiguration {
+
+  public void method() {
+    // ...
+  }
+}
+</pre>
+<h2>Resources</h2>
+<h3>Documentation</h3>
+<ul>
+  <li> <a href="https://docs.spring.io/spring-framework/docs/current/javadoc-api/org/springframework/scheduling/annotation/Async.html">Spring
+  Framework - @Async</a> </li>
+  <li> <a href="https://docs.spring.io/spring-framework/reference/core/beans/java/configuration-annotation.html">Spring Framework - Using the
+  @Configuration annotation</a> </li>
+  <li> <a href="https://docs.spring.io/spring-framework/reference/core/beans/java/basic-concepts.html">Spring Framework - Basic Concepts: @Bean and
+  @Configuration</a> </li>
+</ul>
+<h3>Articles &amp; blog posts</h3>
+<ul>
+  <li> <a href="https://www.baeldung.com/spring-async">Baeldung - How To Do @Async in Spring</a> </li>
+</ul>
+

java-checks/src/main/resources/org/sonar/l10n/java/rules/java/S6817.json

@@ -0,0 +1,23 @@
+{
+  "title": "Use of the \"@Async\" annotation on methods declared within a \"@Configuration\" class in Spring Boot",
+  "type": "BUG",
+  "status": "ready",
+  "remediation": {
+    "func": "Constant\/Issue",
+    "constantCost": "5min"
+  },
+  "tags": [
+    "spring"
+  ],
+  "defaultSeverity": "Major",
+  "ruleSpecification": "RSPEC-6817",
+  "sqKey": "S6817",
+  "scope": "Main",
+  "quickfix": "covered",
+  "code": {
+    "impacts": {
+      "RELIABILITY": "HIGH"
+    },
+    "attribute": "LOGICAL"
+  }
+}

java-checks/src/main/resources/org/sonar/l10n/java/rules/java/Sonar_way_profile.json

@@ -486,6 +486,7 @@
     "S6810",
     "S6813",
     "S6814",
+    "S6817",
     "S6818",
     "S6829",
     "S6837"

java-checks/src/test/java/org/sonar/java/checks/spring/AsyncMethodsOnConfigurationClassCheckTest.java

@@ -0,0 +1,38 @@
+/*
+ * SonarQube Java
+ * Copyright (C) 2012-2023 SonarSource SA
+ * mailto:info AT sonarsource DOT com
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 3 of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this program; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+ */
+package org.sonar.java.checks.spring;
+
+import org.junit.jupiter.api.Test;
+import org.sonar.java.checks.verifier.internal.InternalCheckVerifier;
+
+import static org.sonar.java.checks.verifier.TestUtils.mainCodeSourcesPath;
+
+class AsyncMethodsOnConfigurationClassCheckTest {
+
+  @Test
+  void test() {
+    InternalCheckVerifier.newInstance()
+      .onFile(mainCodeSourcesPath("checks/spring/AsyncMethodsOnConfigurationClassCheck.java"))
+      .withCheck(new AsyncMethodsOnConfigurationClassCheck())
+      .withQuickFixes()
+      .verifyIssues();
+  }
+
+}