Minor Description
From this blog post (and similar) (https://www.cloudbees.com/blog/fileinputstream-fileoutputstream-considered-harmful) as well as pending changes to Ant (https://github.com/apache/ant/pull/77) it seems wise to change these uses, which are just in a couple of places: FileSerializer and QueryServlet (and some demos, but those don't seem as important as "core" classes).