There is a problem with Jira for this, see MPMD-97 (I propose voting for it).
Now you can try locally updating the pmd version used in the plugin with:
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-pmd-plugin</artifactId>
<version>2.4</version>
<dependencies>
<dependency>
<groupId>pmd</groupId>
<artifactId>pmd-jdk14</artifactId>
<version>4.2.5</version>
</dependency>
</dependencies>
</plugin>
</plugins>
</build>
I have not tested this, I do not know if it will work without problems.
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