[MPMD-312] Upgrade to PMD 6.31.0
diff --git a/pom.xml b/pom.xml
index 7e93e82..8612b0e 100644
--- a/pom.xml
+++ b/pom.xml
@@ -89,7 +89,7 @@
     <doxiaVersion>1.9.1</doxiaVersion>
     <doxiaSitetoolsVersion>1.9.2</doxiaSitetoolsVersion>
     <javaVersion>7</javaVersion><!-- Because PMD 5.4+ requires Java 7 -->
-    <pmdVersion>6.30.0</pmdVersion>
+    <pmdVersion>6.31.0</pmdVersion>
     <slf4jVersion>1.7.25</slf4jVersion>
     <sitePluginVersion>3.7.1</sitePluginVersion>
     <projectInfoReportsPluginVersion>3.0.0</projectInfoReportsPluginVersion>
diff --git a/src/site/apt/examples/upgrading-PMD-at-runtime.apt.vm b/src/site/apt/examples/upgrading-PMD-at-runtime.apt.vm
index 7c343b2..ab9d1aa 100644
--- a/src/site/apt/examples/upgrading-PMD-at-runtime.apt.vm
+++ b/src/site/apt/examples/upgrading-PMD-at-runtime.apt.vm
@@ -88,6 +88,8 @@
 *--------------------------------------------------------------------------------*--------------------------------------------------*
 | <<maven-pmd-plugin>>                                                           | <<PMD>>                                          |
 *--------------------------------------------------------------------------------*--------------------------------------------------*
+| {{{https://maven.apache.org/plugins-archives/maven-pmd-plugin-3.15.0/}3.15.0}} | {{{https://pmd.github.io/pmd-6.31.0/}6.31.0}}    |
+*--------------------------------------------------------------------------------*--------------------------------------------------*
 | {{{https://maven.apache.org/plugins-archives/maven-pmd-plugin-3.14.0/}3.14.0}} | {{{https://pmd.github.io/pmd-6.29.0/}6.29.0}}    |
 *--------------------------------------------------------------------------------*--------------------------------------------------*
 | {{{https://maven.apache.org/plugins-archives/maven-pmd-plugin-3.13.0/}3.13.0}} | {{{https://pmd.github.io/pmd-6.21.0/}6.21.0}}    |
diff --git a/src/test/resources/unit/default-configuration/def/configuration/AppSample.java b/src/test/resources/unit/default-configuration/def/configuration/AppSample.java
index b56b173..201bf19 100644
--- a/src/test/resources/unit/default-configuration/def/configuration/AppSample.java
+++ b/src/test/resources/unit/default-configuration/def/configuration/AppSample.java
@@ -39,10 +39,10 @@
     /**
      * Unused method
      *
-     * @param unusedParam
+     * @param notUsedParam
      * @return a blank String
      */
-    private String unusedMethod( String unusedParam )
+    private String unusedMethod( String notUsedParam )
     {
         System.out.println( "This is just a test." );