Added CheckStyle report generation.

dddsample/pom.xml

@@ -370,6 +370,13 @@
         <groupId>org.codehaus.mojo</groupId>
         <artifactId>cobertura-maven-plugin</artifactId>
       </plugin>
+      <!-- CheckStyle report -->
+      <plugin>
+        <artifactId>maven-checkstyle-plugin</artifactId>
+        <configuration>
+          <configLocation>checkstyle.xml</configLocation>
+        </configuration>
+      </plugin>
     </plugins>
   </reporting>
 </project>