ok, found the "error", it is quite simple but I don't get the why... well maybe later on the error was simply that | edition.setContent(new DataHandler(new FileDataSource("/opt/test2.dat"), "application/octet-stream")); | must be | edition.setContent(new DataHandler(new FileDataSource("/opt/test2.dat"))); | @off topic wouldn't it be nice to have something like an edit button? or is there one and I simply overlooked it? View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4203946#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...