import com.jcraft.jsch.Channel;
import com.jcraft.jsch.ChannelSftp;
import com.jcraft.jsch.JSch;
import com.jcraft.jsch.JSchException;
import com.jcraft.jsch.Session;
import com.jcraft.jsch.SftpException;

public class FileCopierOverNetwork
{
    public static void main(String args[])
    {
        String hostname = "1010.15.15";
        String username = "xxxxxx";
        String password = "yyyyyy";
        String copyFrom = "/opt/jboss-eap-5.1/jboss-as/server/xxxdsd/test/";
        String copyTo = "/opt/jboss-eap-5.1/jboss-as/server/xccxcxc/java_programs/test1/";
        JSch jsch = new JSch();
        Session session = null;
        System.out.println("Trying to connect.....");
        try
        {
            session = jsch.getSession(username, hostname, 22);
            java.util.Properties config = new java.util.Properties();
            config.put("StrictHostKeyChecking", "no");
            session.setConfig(config);
            System.out.println("password before.....");
            session.setPassword(password);
            System.out.println("password after.....");
            session.connect();
            System.out.println("after connect.....");
            Channel channel = session.openChannel("sftp");
            ChannelSftp sftpChannel = (ChannelSftp) channel;
            channel.connect();
            sftpChannel.cd(".");
            sftpChannel.get(copyFrom, copyTo);
            sftpChannel.exit();
            session.disconnect();
        }
        catch (JSchException e)
        {
            e.printStackTrace();
        }
        catch (SftpException e)
        {
            e.printStackTrace();
        }
        System.out.println("Done !!");
    }
}

com.jcraft.jsch.JSchException: Auth fail
            at com.jcraft.jsch.Session.connect(Session.java:473)
            at com.jcraft.jsch.Session.connect(Session.java:145)
            at FileCopierOverNetwork.main(FileCopierOverNetwork.java:34)