Java classes (.class) that were compiled by the groovy compiler (groovyc) contain timestamps. See also: [[http://thread.gmane.org/gmane.comp.lang.groovy.user/39306/|Thread on groovy-user mailing list]] [[https://reproducible.debian.net/issues/timestamps_in_groovy_class_files_issue.html|Known affected packages]] = Detection = The diff of .class files contains the string {{{__timeStamp__XXX_neverHappenXXXXXXXXXXXXX}}}. = Workaround = None yet. = Solution = None yet.