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Because JSF is a specification like EJB, you can rely on Java EE application servers to implement JSF for you. Please do not get Java EE confused with J2EE application servers, which may or may not have JSF implemented. If, however, you cannot use an application server that has JSF implemented, open source implementations of JSF are available. The main one out there is MyFaces, which is part of the Apache project. In actuality, JBoss uses MyFaces for its JSF implementation. So even though our configurations later in the chapter are referencing MyFaces classes, we will not actually be including the MyFaces JARs in the WAR, because these files are in the application server by default. However, if you are using BEA WebLogic or IBM WebSphere, some configurations may differ.

The EJB 3 HRManager session bean in Listing 10-16 shows the same logical API as the original EJB 2.1 HRManager bean. However, we can eliminate the use of DTO proxies and cut the number of code lines roughly in half. Note the injection of the EntityManager, using the @PersistenceContext annotation, which identifies the named persistence unit.

Figure 13-12. Click here to find past and present colleagues. LinkedIn guides you through the process of finding people whom you may know at companies where you ve worked. (Remember, this feature depends on your having filled out your profile.) See Figure 13-13.

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Our first example will be our basic Hello World example, to give you a taste of what you are in for with JSF. One thing that you should instantly notice is the similarity it has with our Seam example in 1. In fact, the actual JSP page is exactly the same. This should be expected, because Seam is designed to integrate between components. Because this is our first example, I am going to introduce you to two new concepts as follows:

@Stateless(name = "HRManager") public class HRManagerBean implements HRManager { @PersistenceContext(unitName = "Ch10_EJB30_MigrationExamples") private EntityManager em; private EntityManager getEntityManager() { return em; } public Object mergeEntity(Object entity) { return getEntityManager().merge(entity); } public Object persistEntity(Object entity) { getEntityManager().persist(entity); return entity; } /** <code>select o from Department o</code> */ public List<Department> queryDepartmentFindAll() { return getEntityManager(). createNamedQuery("Department.findAll").getResultList(); } public void removeDepartment(Department department) { department = getEntityManager(). find(Department.class, department.getDeptno()); getEntityManager().remove(department); }

Figure 13-13. LinkedIn helps you reconnect with past colleagues and stay connected with current ones.

/** <code>select o from Employee o</code> */ public List<Employee> queryEmployeeFindAll() { return getEntityManager(). createNamedQuery("Employee.findAll").getResultList(); } public void removeEmployee(Employee employee) { employee = getEntityManager().find(Employee.class, employee.getEmpno()); getEntityManager().remove(employee); } }

Backing beans faces-config.xml I will present a more in-depth analysis of backing beans and the faces-config.xml file later. But for right now I will leave it in more-simplistic terms. A backing bean is a POJO that has been exposed to the JSF container for either data submission or for data retrieval. The faces-config.xml file is a JSF-specific configuration file that configures our backing beans and a host of other components for the container. Listing 3-1 defines the JSF page for our Hello World example.

LinkedIn generally frowns on people trying to add connections by asking people they don t know to join their network. So it s probably a bad idea to go around randomly reaching out to people you don t know. (That is, except in the case of InMail, which is a contact tool. In that case, you aren t trying to add a person as a connection, but are just contacting them. To learn more about InMail, look in the Help section on LinkedIn.) But you can click your contacts profiles and see if they re connected with anyone you know by doing the following: Looking at your connections profiles Clicking their Connections link Looking for people you know, clicking their profiles, and using the Add (person) to your network link

CRUD operations for our Department and Employee entities are exposed through this session fa ade, although their implementations differ significantly. The new methods rely heavily on our EntityManager instance as the single interface into the JPA to retrieve and update the entity instances. In EJB 2.1 and earlier, each EJB required its own home interface methods to perform these operations. The CRUD methods map to these new methods on our EJB 3 session fa ade as follows: Create: The entities are now created through their constructors, but the act of creating the persistent instance is performed by the persistEntity() call. Retrieve: The EJB 3 HRManager session bean provides instance retrieval through the entity-specific query() methods. Update: A single mergeEntity() method handles the task of updating an entity s row in the database. Delete: This operation is performed by the entity-specific remove() methods.

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