Agfdhyk

I have two servers A and B.
I want to SFTP a file from server A to B.

Public key of server A (~/.ssh/id_rsa.pub) has been added to the ~/.ssh/authorized_keys of server B.

From command line, I can SFTP from server A to B without entering password.
However, from a Java client using library Jsch I am unable to make SFTP connection to server B and I am getting authentication error:

Error occurred during SFTP. Auth fail

com.jcraft.jsch.JSchException: Auth fail

    at com.jcraft.jsch.Session.connect(Session.java:519)

    at com.jcraft.jsch.Session.connect(Session.java:183)

    at Main.main(Main.java:15)

Is there a way I can connect to server B for SFTP purposes using Java client without specifying password?

Below is my Java code for reference:

import com.jcraft.jsch.*;



public class Main {



    public static void main(String args) {



        JSch jsch = new JSch();

        Session session = null;



        try {

            session = jsch.getSession("processor", "remoteserver.myorg.com", 22);

            session.setConfig("StrictHostKeyChecking", "no");

            System.out.println("Trying to connect...");

            session.connect();

            System.out.println("Connected successfully.");



            Channel channel = session.openChannel("sftp");

            channel.connect();

            ChannelSftp sftpChannel = (ChannelSftp) channel;

            System.out.println("Doing SFTP...");

            sftpChannel.put("/tmp/test.txt", "/some/remote/folder");

            System.out.println("Success");

            sftpChannel.exit();

            session.disconnect();



        } catch (JSchException | SftpException e) {

            System.err.println("Error occurred during SFTP. " + e.getMessage());

            e.printStackTrace();

        }



    }

}

Use addIdentity() api in jsync and point to your private key file location.

Ref:
Can we use JSch for SSH key-based communication?

   String privateKey = "~/.ssh/id_rsa";    

   jsch.addIdentity(privateKey);

   System.out.println("identity added ");    

   Session session = jsch.getSession(user, host, port);

   System.out.println("session created.");