jms topic Connenction factory lookup hangs

Question

I am trying to connect to HornetQ and perform look up on topic connection factory bTopicConnectionFactory hornetQConnectionFactory = (javax.jms.TopicConnectionFactory)ic.lookup("/ConnectionFactory"); but it gives an error "javax.naming.NamingException: Could not dereference object [Root exception is java.lang.ClassNotFoundException: org.hornetq.jms.client.HornetQJMSConnectionFactory]".Please help

       Properties p = new java.util.Properties();

      p.put(javax.naming.Context.INITIAL_CONTEXT_FACTORY,
      "org.jnp.interfaces.NamingContextFactory");

      p.put(javax.naming.Context.URL_PKG_PREFIXES,
      "org.jboss.naming:org.jnp.interfaces");     


      p.put(javax.naming.Context.PROVIDER_URL, "jnp://172.26.178.137:3900");

      // Step 1. Create an initial context to perform the JNDI lookup.
      System.out.println("Step 0.5");
      ic = new javax.naming.InitialContext(p);        
      System.out.println("Step 1");   


     // Step 3. Perform a lookup on the Connection Factory

      TopicConnectionFactory hornetQConnectionFactory = (javax.jms.TopicConnectionFactory)ic.lookup("/ConnectionFactory");

     System.out.println("Step 1.5");

     String hornetQTopicName = "topic/Test";

      Topic hornetQTopic= (javax.jms.Topic)ic.lookup(hornetQTopicName);