http://www.jcraft.com/jsch/

Sample code to execute remote script:

import com.jcraft.jsch.*;
import java.io.InputStream;

...

// Configure JSch:
JSch.setConfig("StrictHostKeyChecking", "no");

// Environment:
final String user = "subwiz";
final String host = "localhost";
final String password = "password";

JSch jsch=new JSch();

// jsch.addIdentity("/path/to/mypem.pem");

Session session = jsch.getSession(user, host, 22);
session.setPassword(password);
session.connect();

Channel channel=session.openChannel("exec");
((ChannelExec)channel).setPty(true);

((ChannelExec)channel).setCommand("cat /etc/passwd; exit;");

channel.setInputStream(null);
((ChannelExec)channel).setErrStream(System.err);

InputStream in=channel.getInputStream();

channel.connect();

byte[] tmp=new byte[1024];
StringBuilder sb = new StringBuilder();
while(true){
    while(in.available()>0){
        int i=in.read(tmp, 0, 1024);
        if(i<0)break;
        String str = new String(tmp, 0, i);
        sb.append(str);
        System.out.print(str);
    }
    if(channel.isClosed()){
        System.out.println("exit-status: "+channel.getExitStatus());
        break;
    }
    try{Thread.sleep(1000);}catch(Exception ee){}
}
channel.disconnect();
session.disconnect();

// return sb.toString();