I am getting java.net.SocketTimeoutException while executing java file transfer program using jcraft-Jsch api but working with other API

Question

I am getting java.net.SocketTimeoutException while executing java file transfer program using jcraft-Jsch api but working with other API like apache with same connection details.

I am able to connect to FTP server using any FTP client software.

1. Program using Jsch API

   Dependency used:

   <dependency>
       <groupId>com.jcraft</groupId>
       <artifactId>jsch</artifactId>
       <version>0.1.55</version>
   </dependency>
   

   Program using Jsch:

   JSch jsch = new JSch();
   jsch.setKnownHosts("/Users/test/.ssh/known_hosts");
   Session jschSession = jsch.getSession("username", "remoteHost","port");
   jschSession.setPassword("password");
   jschSession.connect();  //Failing here and  connection is not established
   ChannelSftp  channelSftp=jschSession.openChannel("sftp");
   channelSftp.connect();
   
   String localFile = "src/main/resources/sample.txt";
   String remoteDir = "remote_sftp_test/";
   
   channelSftp.put(localFile, remoteDir + "jschFile.txt");
   
   channelSftp.exit();
   

   Note: I am able to connect to FTP server using any client software but not with above program

2. Program using apache-net

   Working program with same connection details using apache net api:

   Dependency used:

   <dependency>
       <groupId>commons-net</groupId>
       <artifactId>commons-net</artifactId>
       <version>3.6</version>
   </dependency>
   

   Program:

   String host="XXXXX";
   int port = 21;
   String user = "username";
   String pass = "pwd";
   
   FTPClient ftpClient = new FTPClient();
   try {
       ftpClient.connect(server, port);
       ftpClient.login(user, pass);
       ftpClient.enterLocalPassiveMode();
       ftpClient.setFileType(FTP.BINARY_FILE_TYPE);
       // APPROACH #1: uploads first file using an InputStream
       File firstLocalFile = new File("C://internal/test.pdf");
       String firstRemoteFile = "test.pdf";
       InputStream inputStream = new FileInputStream(firstLocalFile);
       System.out.println("Start uploading first file");
       boolean done = ftpClient.storeFile(firstRemoteFile, inputStream);
       inputStream.close();
       if (done) {
           System.out.println("The first file is uploaded successfully.");
       }
   } catch (IOException ex) {
       System.out.println("Error: " + ex.getMessage());
       ex.printStackTrace();
   }
   catch (Exception ex) {
       System.out.println("Error: " + ex.getMessage());
       ex.printStackTrace();
   }
   finally {
       try {
           if (ftpClient.isConnected()) {
               ftpClient.logout();
               ftpClient.disconnect();
           }
       } catch (IOException ex) {
           ex.printStackTrace();
       }
   }
   

Answer 1

Your JSch code uses SFTP. Your Apache Commons Net code uses FTP.

Those are two completely different and incompatible protocols.