code: public ChannelSftp getSftpChannel() throws SftpException {
  
      try {
        ChannelSftp channelSftp = (ChannelSftp) this.session.openChannel("sftp");
        channelSftp.connect();
        return channelSftp;
      } catch (JSchException e) {
        throw new SftpException(0, "Cannot open a channel to SFTP server", e);
      }
    }
docs: Create new channel every time a command needs to be executed. This is required to support execution of multiple
  commands in parallel. All created channels are cleaned up when the session is closed.
  
  
  @return a new {@link ChannelSftp}
  @throws SftpException