Hm, I'm not too familiar with the Eclipse plugin, so you may want to post this question on the PMD forums here:
More folks who use that plugin hang out thereabouts....
Using PMD? Get the book! http://pmdapplied.com/
© 2014, O’Reilly Media, Inc.
All trademarks and registered trademarks appearing on oreilly.com are the property of their respective owners.