file producer - NIO transferTo 2gb bug in jdk

It appears that the JDK have a limitation that transferTo with large files.
http://72.5.124.102/thread.jspa?threadID=5205184&messageID=9822064

See nabble
http://old.nabble.com/camel-casts-exception-when-there-is-nothing-to-fetch-from-the-ftp-endpoint-to26541447.html

The code should be in a loop and transfer in chunks.