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applications with some complex transactions, particularly when portability between different database products is important. These applications usually don t use stored procedures. Full object mapping Full object mapping supports sophisticated object modeling: composition, inheritance, polymorphism, and persistence by reachability. The persistence layer implements transparent persistence; persistent classes do not inherit from any special base class or have to implement a special interface. Efficient fetching strategies (lazy, eager, and prefetching) and caching strategies are implemented transparently to the application. This level of functionality can hardly be achieved by a homegrown persistence layer it s equivalent to years of development time. A number of commercial and open source Java ORM tools have achieved this level of quality. This level meets the definition of ORM we re using in this book. Let s look at the problems we expect to be solved by a tool that achieves full object mapping.

Figure 18-8

The Event Properties dialog box contains the following information to help you identify an event: Date and Time Type The date and time that the event occurred.

The following list of issues, which we ll call the ORM problems, identifies the fundamental questions resolved by a full object/relational mapping tool in a Java environment. Particular ORM tools may provide extra functionality (for example, aggressive caching), but this is a reasonably exhaustive list of the conceptual issues and questions that are specific to object/relational mapping.

The type of event (Information, Warning, and so on).

User The user with which the event is associated. Many events do not have an associated user. Computer Source The computer on which the event occurred.

What do persistent classes look like How transparent is the persistence tool Do we have to adopt a programming model and conventions for classes of the business domain How is mapping metadata defined Because the object/relational transformation is governed entirely by metadata, the format and definition of this metadata is important. Should an ORM tool provide a GUI interface to manipulate the metadata graphically Or are there better approaches to metadata definition How do object identity and equality relate to database (primary key) identity How do we map instances of particular classes to particular table rows How should we map class inheritance hierarchies There are several standard strategies. What about polymorphic associations, abstract classes, and interfaces

a. Correct: RemoteApp uses one server session for multiple applications. B. Incorrect: RemoteApp uses one server session for multiple applications. c. Incorrect: RemoteApp does not require an IIS server; you can deploy applications as

Category The category associated with the event. Most events, particularly in the System log, do not have categories. Some application developers specify a category for events that concern the application, so you will see some events in the Application log that have an associated category. In the Security log, the category indicates the type of event that was audited.

If the Process Validations phase completes, register.doRegister executes in Invoke Application. This is a stateful session bean that lives in the event context. The registration Seam component The registration form has two bindings to the register Seam component. The first binding is a value binding, with register.verifyPassword. JSF and Seam now synchronize the user input from this field with the register.setVerifyPassword() and register.getVerifyPassword() methods. The second binding is an action binding of the Register button to the register.doRegister() method. This method must implement additional checks after JSF and Hibernate Validator input validation, before the currentUser can be stored as a new account in the database. See the code in listing 17.16.

Using Event Viewer 18-15

Event ID The Event ID number associated with the event. Microsoft keeps track of Event IDs and often makes solutions to problems available in the Microsoft Knowledge Base. To find out more about an event, use the Event ID as a keyword search in the Knowledge Base. Description A description of the event. The description often includes information on other services affected by the event and a link for finding out more information.

package auction.beans; import ... @Name("register") @Scope(ScopeType.EVENT) @Stateful public class RegisterBean implements Register { @In private User currentUser; @PersistenceContext private EntityManager em;