How to use SSHClient as a service

[guilhemferr]

Currently, we're wrapping the library in a Spring Boot service like the following.

// error handling redacted
class SFTPService {
 public SFTPConnection connect() {
        SSHClient ssh = new SSHClient();
        ssh.loadKnownHosts();
        ssh.connect("localhost");
        ssh.authPublickey(System.getProperty("user.name"));
        return new SFTPConnection(ssh, ssh.newSFTPClient());
}

So clients would inject the SFTPService and call connect when they need to talk with the SFTP server. Internally SFTPConnection provides some abstraction on top of the library, but mainly it implements a closable interface. So when it is closed we close the current connection and we call disconnect int he sshClient. I'm wondering what are the best practices to handle connections in the context of a bean? Is there any downside on holding a class instance of SSHClient already connected?