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A floppy disk (referred to as a system recovery disk) that contains hard drive configuration information A full backup of your local system partition on tape or as a file located on a network server

After creating the system recovery disk and full backup, you can boot your computer by using the disk and run an automated system recovery process to restore your computer.

9

an EJB container either replaces (EJB 2.1, entity beans with CMP) or implements (EJB 3.0, Java Persistence entities) the persistence aspect. Hibernate persistent classes and the EJB 3.0 entity programming model offer transparent persistence. Hibernate and Java Persistence also provide automatic persistence. Let s explore both terms in more detail and find an accurate definition.

Figure 20-8

Using the Automated System Recovery Wizard 20-33

We use transparent to mean a complete separation of concerns between the persistent classes of the domain model and the persistence logic, where the persistent classes are unaware of and have no dependency on the persistence mechanism. We use automatic to refer to a persistence solution that relieves you of handling low-level mechanical details, such as writing most SQL statements and working with the JDBC API. The Item class, for example, doesn t have any code-level dependency on any Hibernate API. Furthermore:

To access the Automated System Recovery Wizard, click Start, point to All Programs, point to Accessories, point to System Tools, and then click Backup. On the Welcome To The Backup Or Restore Wizard page, click Advanced Mode. To use the Automated System Recovery Wizard, use the following steps: 1. In the Advanced Mode window of the Backup Utility, click Automated System Recovery Wizard. The Backup Utility displays the Welcome To The Automated System Recovery Preparation Wizard page. 2. Click Next to continue. The Automated System Recovery Wizard begins and displays the Backup Destination page (see Figure 20-9). The options on the Backup Destination page are explained in Table 20-4.

Description The target medium to use, such as a tape or file. A file can be located on any disk-based media, including a hard disk, a shared network folder, or a removable disk, such as an Iomega Zip disk. The location where the Backup Utility will store the data. For a tape, enter the tape name. For a file, enter the path for the backup file.

Hibernate doesn t require that any special superclasses or interfaces be inherited or implemented by persistent classes. Nor are any special classes used to implement properties or associations. (Of course, the option to use both techniques is always there.) Transparent persistence improves code readability and maintenance, as you ll soon see. Persistent classes can be reused outside the context of persistence, in unit tests or in the user interface (UI) tier, for example. Testability is a basic requirement for applications with rich domain models. In a system with transparent persistence, objects aren t aware of the underlying data store; they need not even be aware that they are being persisted or retrieved. Persistence concerns are externalized to a generic persistence manager interface in the case of Hibernate, the Session and Query. In JPA, the EntityManager and Query (which has the same name, but a different package and slightly different API) play the same roles.

20-34

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Transparent persistence fosters a degree of portability; without special interfaces, the persistent classes are decoupled from any particular persistence solution. Our business logic is fully reusable in any other application context. You could easily change to another transparent persistence mechanism. Because JPA follows the same basic principles, there is no difference between Hibernate persistent classes and JPA entity classes.