kerberos jsch help

JSch jsch = new JSch();
        jsch.setLogger(new MyLogger());

        System.setProperty("java.security.krb5.conf", "/Users/swithana/git/KerberosConnector/src/main/resources/krb5.conf");
        System.setProperty("java.security.auth.login.config", "/Users/swithana/git/KerberosConnector/src/main/resources/mylogin.conf");
        System.setProperty("javax.security.auth.useSubjectCredsOnly", "true");


        try {
            jsch.addIdentity(privateKey,paraphrase);
            jsch.setKnownHosts("/Users/swithana/.ssh/known_hosts");

            Session session = jsch.getSession(user, host, 22);
            Properties config = new java.util.Properties();
            config.put("StrictHostKeyChecking", "no");
            config.put("PreferredAuthentications",
                    "gssapi-with-mic,publickey,password,keyboard-interactive");

            session.setConfig(config);
            session.connect(20000);

            Channel channel = session.openChannel("exec");
            ((ChannelExec) channel).setCommand( command);
            channel.setInputStream(null);
            ((ChannelExec) channel).setErrStream(System.err);