shell unix is not running from java

Hi, I have the following code that connects to my Linux server (AIX 6.1) and executes a command: import com.jcraft.jsch.ChannelExec; import com.jcraft.jsch.JSch; import com.jcraft.jsch.JSchException; import com.jcraft.jsch.Session; import java.io.BufferedReader; import java.io.IOException; import java.io.InputStream; import java.io.InputStreamReader;

/ **  * Class responsible for establishing connection and executing SSH commands.  * / public class SSHConnector {

/**
 * Constante que representa un enter.
 */
private static final String ENTER_KEY = " ";
/**
 * Sesión SSH establecida.
 */
private Session session;

private static final String USERNAME = "user";
private static final String HOST = "10.00.00";
private static final int PORT = 22;
private static final String PASSWORD = "pass";


public void connect(String username, String password, String host, int port)
    throws JSchException, IllegalAccessException {
    if (this.session == null || !this.session.isConnected()) {
        JSch jsch = new JSch();

        this.session = jsch.getSession(username, host, port);
        this.session.setPassword(password);

        // Parametro para no validar key de conexion.
        this.session.setConfig("StrictHostKeyChecking", "no");

        this.session.connect();
    } else {
        throw new IllegalAccessException("Sesion SSH ya iniciada.");
    }
}

    public final String executeCommand(String command)
    throws IllegalAccessException, JSchException, IOException {
    if (this.session != null && this.session.isConnected()) {

        // Abrimos un canal SSH. Es como abrir una consola.
        ChannelExec channelExec = (ChannelExec) this.session.
            openChannel("exec");

        InputStream in = channelExec.getInputStream();

        // Ejecutamos el comando.
        channelExec.setCommand(command);
        channelExec.connect();

        // Obtenemos el texto impreso en la consola.
        BufferedReader reader = new BufferedReader(new InputStreamReader(in));
        StringBuilder builder = new StringBuilder();
        String linea;

        while ((linea = reader.readLine()) != null) {
            builder.append(linea);
            builder.append(ENTER_KEY);
        }

        // Cerramos el canal SSH.
        channelExec.disconnect();

        // Retornamos el texto impreso en la consola.
        return builder.toString();
    } else {
        throw new IllegalAccessException("No existe sesion SSH iniciada.");
    }
}
 public static void main(String[] args) {

    try {
        SSHConnector sshConnector = new SSHConnector();
       sshConnector.connect(USERNAME, PASSWORD, HOST, PORT);
        **String result = sshConnector.executeCommand("cd home/recauser/procesos/orquestador/bin;./startOrquestador.sh start");**

// String result = sshConnector.executeCommand ("hostname");

       sshConnector.disconnect();

       System.out.println(result);

   } catch (JSchException ex) {
        ex.printStackTrace();

        System.out.println(ex.getMessage());
    } catch (IllegalAccessException ex) {
       ex.printStackTrace();

        System.out.println(ex.getMessage());
   } 
    catch (IOException ex) {
       ex.printStackTrace();

       System.out.println(ex.getMessage());
   }
}
/**
 * Cierra la sesión SSH.
 */
public final void disconnect() {
    this.session.disconnect();
}

}

The code works for me when I launch a "hostname" or "date" but if I want to execute the Shell (variable result) it does not. It means that the connection is fine only I need the Shell to run.