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the JNDI name of the EntityManagerFactory, the unitName element is used to specify the name of the underlying persistence unit. Figure 9.5 shows the relationships between important interfaces made available by JPA outside the container. The EntityManagerFactory s createEntityManager method creates an application-managed EntityManager. This is probably the most commonly used method in the interface, in addition to the close method. We don t explicitly close the factory in listing 9.2 since the container takes care of cleaning up all resources it injects (unlike the EntityManager, which is created programmatically and is explicitly closed). Table 9.2 lists all the methods in the EntityManagerFactory interface. As you can see, most of them are fairly self-explanatory.

Table 9.2 The EntityManager factory is used to create an instance of an application-managed EntityManager. Method EntityManager createEntityManager() EntityManager createEntityManager(Map map) Purpose Creates an application-managed EntityManager.

You want to examine an EJB using reflection in order to determine its methods, method parameters, and other information.

In OOP, the principal way that objects interact is by invoking methods. In other words, an object that needs to carry out an action invokes a method that belongs to another object. (An object can also invoke one of its own methods.) OOP always entail two roles: that of the invoker and that of the invoked. When you write the code to call a method, you do not need to worry about how the service is implemented because the call interacts only with the interface of the invoked object. You need only ensure that the parameters in the call correspond to those of the method s signature. Because methods are implemented within classes, you write each method as a block of code that is clearly delimited. To change a method, you obviously modify the file that contains the class where the method is defined. If you alter just the body of the method, the modification is transparent because the method will still be called in exactly the same way. However, if you change the method s signature (for example, by adding a parameter), further implications arise. You must then modify all the calls to the method, hence you must modify any classes that invoke the method. If these calls exist in several places in the program, making the changes can be extremely time-consuming. The main point is this: Even though the implementation of a method is located in a single class, the calls to that method can be scattered throughout the application. This phenomenon of code scattering slows down maintenance tasks and makes it difficult for object-oriented applications to adapt and evolve. Any change in the way that a service is used requires many other changes a costly process that can also introduce errors.

Creates an application-managed EntityManager with a specified Map. The Map contains vendor-specific properties to create the manager. Closes the EntityManagerFactory. Checks whether the EntityManagerFactory is open.

void close() boolean isOpen()

In your EJB application, you would like to examine an EJB reference using reflection. However, since an EJB reference is actually a reference to a stub object in the EJB container (pointing to an EJB), you cannot examine the actual EJB itself. Or you might only have a reference to the EJB home object and you want to determine the EJB s available business methods before looking up or creating one. Using reflection on an EJB reference will not work because the reference points to an EJB stub object inside the EJB container, not to the EJB itself.