configured m-checkstyle-p with workaround to avoid checking generated content

git-svn-id: https://svn.apache.org/repos/asf/maven/pom/trunk@1631068 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/maven/pom.xml b/maven/pom.xml
index 5f094c4..f8e12a7 100644
--- a/maven/pom.xml
+++ b/maven/pom.xml
@@ -794,7 +794,6 @@
     <mavenPluginToolsVersion>3.3</mavenPluginToolsVersion>
     <!-- don't fail check for some rules that are too hard to enforce (could even be told broken for some) -->
     <checkstyle.violation.ignore>RedundantThrows,NewlineAtEndOfFile</checkstyle.violation.ignore>
-    <checkstyle.excludes>**/HelpMojo.java</checkstyle.excludes>
   </properties>
 
   <dependencyManagement>
@@ -895,6 +894,9 @@
           <configuration>
             <configLocation>config/maven_checks.xml</configLocation>
             <headerLocation>config/maven-header.txt</headerLocation>
+            <!-- workaround to avoid analysing generated content (Modello, plugin help mojo, ...) -->
+            <sourceDirectory>src/main/java</sourceDirectory>
+            <testSourceDirectory>src/test/java</testSourceDirectory>
           </configuration>
         </plugin>
       </plugins>