Apache Commons FTPClient.listFiles

Just a silly suggestion... can you do a listing on the /uploads folder using a normal FTP client. I ask this because some FTP servers are setup to not display the listing of an upload folder.

This seems like the same issue I had (and solved), see this answer:

Apache Commons Net FTPClient and listFiles()

I added client.enterLocalPassiveMode() and it works:

client.connect("xxx.com");
boolean login = client.login("xxx", "xxx");
client.enterLocalPassiveMode();

After I set the mode as PASV it is working fine now! Thanks for all your efforts and suggestions!