Java – Run ssh commands in linux

import java.io.*;
import ch.ethz.ssh2.*;
public class JavaRunSshCommandExample {

    public static void main(String[] args) {

        String hostname = "127.0.0.1";
        String username = "root";
        String password = "password";

        boolean isAuthenticated = false;

        try
        {
            Connection conn = new Connection(hostname);

            conn.connect();

            isAuthenticated=conn.authenticateWithPassword(username, password);

            if (isAuthenticated == false)
                throw new IOException("Authentication failed.");

            Session sess = conn.openSession();

            sess.execCommand("cd /;ls -l> out.txt");

            InputStream stdout = new StreamGobbler(sess.getStdout());
            InputStream stderr = new StreamGobbler(sess.getStderr());

            InputStreamReader insrout=new InputStreamReader(stdout);
            InputStreamReader insrerr=new InputStreamReader(stderr);

            BufferedReader stdoutReader = new BufferedReader(insrout);

            BufferedReader stderrReader = new BufferedReader(insrerr);

            while (true)
            {
                String line = stdoutReader.readLine();
                if (line == null)
                {
                    break;
                }
                System.out.println(line);
            }

            while (true)
            {
                String line = stderrReader.readLine();
                if (line == null)
                {    break;}
                System.out.println(line);
            }

            sess.close();

            conn.close();
        }
        catch (IOException e)
        {
            e.printStackTrace(System.err);
            System.exit(2);
        }
    }
}