Starting with 5.6 checkstyle doesn't support the DoubleCheckedLocking rule anymore
Starting with 5.6 checkstyle doesn't support the DoubleCheckedLocking rule anymore

git-svn-id: c3ad59981690829a43dc34c293c4e2cd04bcd994@1452432 13f79535-47bb-0310-9956-ffa450edef68

kalaspuffar/pdfbox,apache/pdfbox,apache/pdfbox,kalaspuffar/pdfbox