FTPClient.listFiles not working

Question

I am trying to list all the files under a specific directory in a ftp server.

FTPFile[] subFiles = ftpClient.listFiles("directory");

Although the directory is a valid one , but the code gets stuck while calling listFiles , what may be the reason. ? Further i would like to mention that a seperate netbeans project accessing the same FTP server is working fine with the same code , but a maven project is having the problem. please help.

Solution 1

Try to use passive mode. I assume that you are using the newest commons net library (you didn't write which lib you are using).

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Next approach, try to change the file list layout. The commons lib uses auto-detection but in some cases this doesn't work. You can change (and test) another file list layout as followed:

FTPClientConfig configuration = new FTPClientConfig(FTPClientConfig.TEST_YOURSELF);

FTPClient yourClient = FTPClient(...);
client.configure(conf);

Solution 2

To add to above answers the enterLocalPassiveMode() method should be called after connect() and before login(). Any other way I couldn't get mine to work. This testing was based on another answer as specified here: https://stackoverflow.com/a/5183296/11971304

            client.connect(host, port);
            client.enterLocalPassiveMode();
            if (!client.login(username, password)) {
                throw new LoginException("wrong credentials");
            }