Apache Commons Net FTPClient and listFiles()

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Found it!

The thing is you want to enter passive mode after you connect, but before you log in.
Your code returns nothing for me, but this works for me: 

import org.apache.commons.net.ftp.FTPClient;
import java.io.IOException;
import org.apache.commons.net.ftp.FTPFile;

public class BasicFTP {

    public static void main(String[] args) throws IOException {
        FTPClient client = new FTPClient();
        client.connect("c64.rulez.org");
        client.enterLocalPassiveMode();
        client.login("anonymous", "");
        FTPFile[] files = client.listFiles("/pub");
        for (FTPFile file : files) {
            System.out.println(file.getName());
        }
    }
}

Gives me this output:

c128
c64
c64.hu
incoming
plus4

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