Add java doc.

git-svn-id: https://svn.apache.org/repos/asf/creadur/rat/branches/gsoc@1548704 13f79535-47bb-0310-9956-ffa450edef68
Apply PMD Rules.

git-svn-id: https://svn.apache.org/repos/asf/creadur/rat/branches/gsoc@1548705 13f79535-47bb-0310-9956-ffa450edef68