Activate Maven PMD plugin in the project

<!-- See https://pmd.github.io/ for available latest version -->
<pmd.version>5.1.6</pmd.version>

<plugin> 
               <!-- to disable - mvn [commands...] -Dpmd.skip --> 
               <groupId>org.apache.maven.plugins</groupId> 
               <artifactId>maven-pmd-plugin</artifactId> 
               <configuration> 
                   <rulesets> 
                       <ruleset>${workspace.root.dir}${file.separator}pmd-ruleset-sshd.xml</ruleset>
                   </rulesets> 
                   <ncludeTests>true</includeTests>
               </configuration> 
               <executions> 
                   <execution> 
                       <id>pmd-checker</id> 
                       <!-- Note: phase must be AFTER detection of workspace root dir --> 
                       <phase>verify</phase> 
                       <goals> 
                           <goal>check</goal> 
                       </goals> 
                   </execution> 
               </executions> 
           </plugin>

<plugin> 
                   <groupId>org.apache.maven.plugins</groupId> 
                   <artifactId>maven-pmd-plugin</artifactId> 
                   <version>3.8</version> 
                   <configuration> 
                       <targetJdk>${javac.target}</targetJdk> 
                       <printFailingErrors>true</printFailingErrors> 
                       <skipPmdError>false</skipPmdError> 
                       <excludeRoots> 
                           <excludeRoot>target/generated-sources/java</excludeRoot> 
                       </excludeRoots> 
                   </configuration> 
                   <dependencies> 
                       <dependency> 
                          <groupId>net.sourceforge.pmd</groupId> 
                          <artifactId>pmd-core</artifactId> 
                          <version>${pmd.version}</version> 
                       </dependency> 
                       <dependency> 
                          <groupId>net.sourceforge.pmd</groupId> 
                          <artifactId>pmd-java</artifactId> 
                          <version>${pmd.version}</version> 
                       </dependency> 
                   </dependencies> 
               </plugin>

<reporting> 
       <plugins> 
           <plugin>    <!-- used by PMD to create a source XREF --> 
               <groupId>org.apache.maven.plugins</groupId> 
               <artifactId>maven-jxr-plugin</artifactId> 
               <version>2.5</version> 
           </plugin> 
       </plugins> 
   </reporting>

<?xml version="1.0"?> 
<ruleset name="MINA SSHD PMD ruleset" 
   xmlns="http://pmd.sourceforge.net/ruleset/2.0.0" 
   xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
   xsi:schemaLocation="http://pmd.sourceforge.net/ruleset/2.0.0 http://pmd.sourceforge.net/ruleset_2_0_0.xsd"> 

   <description> 
       This ruleset defines the PMD rules for MINA SSHD project 
   </description> 

       <!-- See https://pmd.github.io/pmd-5.6.1/pmd-java/rules/index.html --> 
   <rule ref="rulesets/java/basic.xml/BooleanInstantiation" /> 
   <rule ref="rulesets/java/basic.xml/ExtendsObject" /> 

   <rule ref="rulesets/java/braces.xml" /> 

   <rule ref="rulesets/java/clone.xml/ProperCloneImplementation" /> 
   <rule ref="rulesets/java/clone.xml/CloneMethodMustImplementCloneable" /> 

   <rule ref="rulesets/java/javabeans.xml/MissingSerialVersionUID" /> 

   <rule ref="rulesets/java/logging-java.xml/AvoidPrintStackTrace" /> 
</ruleset>