public DigitalLibraryServer() {
    try {
      Properties properties = new Properties();
      properties.put(Context.INITIAL_CONTEXT_FACTORY, "org.jnp.interfaces.NamingContextFactory");
      properties.put(Context.URL_PKG_PREFIXES, "org.jnp.interfaces");
      properties.put(Context.PROVIDER_URL, "localhost");

      InitialContext jndi = new InitialContext(properties);
      ConnectionFactory conFactory = (ConnectionFactory) jndi.lookup("XAConnectionFactory");
      connection = conFactory.createConnection();

      session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);

      try {
        counterTopic = (Topic) jndi.lookup("counterTopic");
      } catch (NamingException NE1) {
        System.out.println("NamingException: " + NE1 + " : Continuing anyway...");
      }

      if (null == counterTopic) {
        counterTopic = session.createTopic("counterTopic");
        jndi.bind("counterTopic", counterTopic);
      }

      consumer = session.createConsumer(counterTopic);
      consumer.setMessageListener(this);
      System.out.println("Server started waiting for client requests");
      connection.start();
    } catch (NamingException NE) {
      System.out.println("Naming Exception: " + NE);
    } catch (JMSException JMSE) {
      System.out.println("JMS Exception: " + JMSE);
      JMSE.printStackTrace();
    }
  }