Add java doc.

git-svn-id: https://svn.apache.org/repos/asf/creadur/rat/branches/gsoc@1549226 13f79535-47bb-0310-9956-ffa450edef68
Apply PMD change.

git-svn-id: https://svn.apache.org/repos/asf/creadur/rat/branches/gsoc@1549227 13f79535-47bb-0310-9956-ffa450edef68