authTopic = (Topic) initialContext.lookup("topic/topicAuth");
authTopic = (Topic) initialContext.lookup(BeanConfig.PrefixTopicName+"topicAuth");
  public String getBuyNowForm(int itemId, String username, String password) throws RemoteException  {    int userId = -1;    StringBuffer html = new StringBuffer();    PreparedStatement stmt = null;    ResultSet rs           = null;    Connection conn        = null;    // Authenticate the user who want to buy      if ((username != null && !username.equals("")) || (password != null && !password.equals("")))      {        TopicConnection authConnection;        TopicSession authSession;        Topic authTopic;        try         {          // create a connection          authConnection = connectionFactory.createTopicConnection();          // lookup the destination          authTopic = (Topic) initialContext.lookup("topic/topicAuth");          // create a session          authSession  = authConnection.createTopicSession(false, Session.AUTO_ACKNOWLEDGE); // no transaction and auto ack        }         catch (Exception e)        {          throw new EJBException("Cannot connect to message bean MDB_Auth : " +e+"<br>");        }        try         {          // create a requestor to receive the reply          TopicRequestor requestor = new TopicRequestor(authSession, authTopic);          // create a message          MapMessage m = authSession.createMapMessage();          // set parameters          m.setStringProperty("nickname", username);          m.setStringProperty("password", password);          m.setJMSCorrelationID("auth");          // send the message and receive the reply          authConnection.start(); // allows message to be delivered (default is connection stopped)          MapMessage authReply = (MapMessage)requestor.request(m);          authConnection.stop();          // read the reply          userId = authReply.getInt("userId");          // close connection and session          requestor.close(); // also close the session          authConnection.close();        }         catch (Exception e)        {          throw new EJBException("user authentication failed: " +e+"<br>");        }        if (userId == -1)        {           html.append("You don't have an account on RUBiS!<br>You have to register first.<br>");           return html.toString();        }      }    // Try to find the Item corresponding to the Item ID    String itemName = null, description = null;    String startDate = null, endDate = null, sellerName = null;    int quantity = 0, sellerId = -1;    float buyNow = 0;    try    {      conn = dataSource.getConnection();      stmt = conn.prepareStatement("SELECT * FROM items WHERE id=?");      stmt.setInt(1, itemId);      rs = stmt.executeQuery();      if (rs.first())      {        itemName = rs.getString("name");        description = rs.getString("description");        startDate = rs.getString("start_date");        endDate = rs.getString("end_date");        buyNow = rs.getFloat("buy_now");        quantity = rs.getInt("quantity");        sellerId = rs.getInt("seller");      }      stmt.close();    }    catch (Exception e)    {      try      {        if (stmt != null) stmt.close();        if (conn != null) conn.close();      }      catch (Exception ignore)      {      }      throw new RemoteException("Failed to execute Query for item: " +e);    }    try    {      stmt = conn.prepareStatement("SELECT nickname FROM users WHERE id=?");      stmt.setInt(1, sellerId);      ResultSet srs = stmt.executeQuery();      if (srs.first())      {        sellerName = srs.getString("nickname");      }      stmt.close();      conn.close();    }    catch (SQLException s)    {      try      {        if (stmt != null) stmt.close();        if (conn != null) conn.close();      }      catch (Exception ignore)      {      }      throw new RemoteException("Failed to execute Query for seller: " +s);    }    // Display the form for buying the item    html.append("<TABLE width=\"100%\" bgcolor=\"#CCCCFF\">\n<TR><TD align=\"center\" width=\"100%\"><FONT size=\"4\" color=\"#000000\"><B>You are ready to buy this item: "+itemName+"</B></FONT></TD></TR>\n</TABLE><p>\n");    try    {      html.append(printItemDescriptionToBuyNow(itemId, itemName, description, buyNow, quantity, sellerId, sellerName, startDate, endDate, userId));    }    catch (Exception e)    {      throw new RemoteException("Unable to print Item description: " +e);    }    return html.toString();  }