Apache Commons Net FTPClient and listFiles()

Question

Can anyone explain me what's wrong with the following code? I tried different hosts, FTPClientConfigs, it's properly accessible via firefox/filezilla... The problem is I always get empty filelist without any exceptions (files.length == 0). I use commons-net-2.1.jar installed with Maven.

    FTPClientConfig config = new FTPClientConfig(FTPClientConfig.SYST_L8);      FTPClient client = new FTPClient();     client.configure(config);      client.connect("c64.rulez.org");     client.login("anonymous", "anonymous");     client.enterRemotePassiveMode();      FTPFile[] files = client.listFiles();     Assert.assertTrue(files.length > 0); 

Answer 1

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 

Answer 2

Only using enterLocalPassiveMode() did not work for me.

I used following code, which worked.

    ftpsClient.execPBSZ(0);     ftpsClient.execPROT("P");     ftpsClient.type(FTP.BINARY_FILE_TYPE); 

Complete example is as below,

    FTPSClient ftpsClient = new FTPSClient();              ftpsClient.connect("Host", 21);      ftpsClient.login("user", "pass");      ftpsClient.enterLocalPassiveMode();      ftpsClient.execPBSZ(0);     ftpsClient.execPROT("P");     ftpsClient.type(FTP.BINARY_FILE_TYPE);      FTPFile[] files = ftpsClient.listFiles();      for (FTPFile file : files) {         System.out.println(file.getName());     }