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return this.lastname; } public void setLastname(String lastname) { this.lastname = lastname; } } As you can see, there are no annotations anymore. Removing the annotations was not a requirement, though. As mentioned earlier, you could have both mapping metadata in orm.xml and annotations. In that case, however, the deployment descriptor elements override the annotations. Next, check out the Order.java and Customer.java files implementing the Order and Customer entities, respectively. These entities still have to contain mapping annotations since you do not define mapping metadata for them in the orm.xml file, and they should look like they were presented in Listing 8-3 and Listing 8-1 in the preceding chapter, respectively. Finally, you need to create a servlet with the help of which you could make sure that replacing annotations with the deployment descriptor does not cause any problem at runtime. So, move on to the src/ejbjpa/servlets directory, and replace the JpaTestServlet.java file with the OrmXMLTestServlet.java file shown in Listing 9-3. Listing 9-3. Source Code for the OrmXMLTestServlet Servlet You Might Use to Test the Employee Entity Implemented Without Mapping Annotations package ejbjpa.servlets; import java.io.*; import java.util.*; import java.sql.*; import javax.servlet.*; import javax.servlet.http.*; import javax.transaction.*; import javax.annotation.Resource; import javax.persistence.EntityManager; import javax.persistence.EntityManagerFactory; import javax.persistence.PersistenceUnit; import ejbjpa.entities.*; public class OrmXMLTestServlet extends HttpServlet { @PersistenceUnit private EntityManagerFactory emf; @Resource private UserTransaction userTransaction; public void doGet( HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { response.setContentType("text/html"); response.setBufferSize(8192); PrintWriter out = response.getWriter();

EntityManager em= emf.createEntityManager(); Customer cust = (Customer) em.find(Customer.class, 2); Employee emp = (Employee) em.find(Employee.class, 2); Order order1 = new Order(); order1.setPono(10); order1.setCustomer(cust); order1.setEmployee(emp); Order order2 = new Order(); order2.setPono(11); order2.setCustomer(cust); order2.setEmployee(emp); //Performing transaction try{ userTransaction.begin(); out.println("Transaction began!"+"<br/>"); em.persist(order1); em.persist(order2); em.flush(); em.refresh(emp); out.println("order " + emp.getOrders().get(0).getPono()+ " placed via: " + emp.getOrders().get(0).getEmployee().getLastname() + "<br/>"); out.println("order " + emp.getOrders().get(1).getPono()+ " placed via: " + emp.getOrders().get(1).getEmployee().getLastname() + "<br/>"); userTransaction.rollback(); out.println("Transaction has been rolled back!"); } catch (Exception e){ e.printStackTrace(); } } } In the OrmXMLTestServlet servlet shown in the listing, you find Employee and Customer entity instances by the primary keys specified and define two Order entity instances, which you then persist to the database. Next, you refresh the Employee entity from the database. Finally, to make sure everything works as expected, you obtain the employee s last name for each order just persisted using the following calls to the Employee entity: emp.getOrders().get(0).getEmployee().getLastname() emp.getOrders().get(1).getEmployee().getLastname() Now that you have the sources ready, all that s left is to compile them, package them into a WAR archive, and finally deploy the package to the application server. After that, you can run the servlet shown in the listing by pointing your browser to http://localhost:8080/ ormxmltest/ormxmltestservlet (the actual URL will depend on the settings you specified in the web.xml and sun-web.xml files, of course). If everything is right, you should see the following output:

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Figure 7-7. The get_fax_contacts view in the contacts design document When the page refreshes, you will be viewing the page for the new permanent view, get_fax_contacts (Figure 7-7). This page is similar to the temporary view builder page. To show the code behind the view, click View Code in the box immediately above the Key/Value table. Once again, you should see the Map Function and Reduce Function columns with the Run and Save As buttons. The main differences between this page and the temporary view builder are that the Select view dropdown box now shows get_fax_contacts. Also, in the top right of the View Code box, you will see the name of the design document the view is stored in, _design/contacts. Another difference between this page and the temporary view builder is that when you modify the view on this page, the buttons Revert and Save become enabled. The functionality of these buttons is exactly as you might expect clicking Revert will undo any changes you have made since the previous save, and clicking Save persists the new view code to the design document. Let s make a change to see how this works. First, change the code to anything you like (I entered blah), and try the Revert button to undo it. Pretty mind-blowing stuff, eh Next, let s make a small change to the map function so that it returns the contacts fax numbers instead of phone numbers. Change the function to look like Listing 7-4.

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