Pickup Maven Javadoc plugin version from commons-parent.
diff --git a/pom.xml b/pom.xml
index 4f3de0d..1773d34 100644
--- a/pom.xml
+++ b/pom.xml
@@ -203,6 +203,7 @@
         <plugin>
           <groupId>org.apache.maven.plugins</groupId>
           <artifactId>maven-javadoc-plugin</artifactId>
+          <version>${commons.javadoc.version}</version>
           <configuration> 
             <quiet>true</quiet>
             <source>${maven.compiler.source}</source>