Is there a way to upload a file with ftp4j in append mode? I can't find any reference to that in the documentation or on google. Thank you!
Starting from frp4j 1.6 you can use the append() method:
See: http://www.sauronsoftware.it/projects/ftp4j/api/it/sauronsoftware/ftp4j/FTPClient.html#append%28java.io.File%29