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As a reaction against EJB 2.1 entity instances, many developers started talking about Plain Old Java Objects (POJOs),1 a back-to-basics approach that essentially revives JavaBeans, a component model for UI development, and reapplies it to the business layer. (Most developers now use the terms POJO and JavaBean almost synonymously.) The overhaul of the EJB specification brought us new lightweight entities, and it would be appropriate to call them persistence-capable JavaBeans. Java developers will soon use all three terms as synonyms for the same basic design approach. In this book, we use persistent class for any class implementation that is capable of persistent instances, we use POJO if some Java best practices are relevant,

Using the Automated System Recovery Wizard 20-35

When restoring the system or software files from backup with Recovery Console, you should replace one file at a time to see whether it fixes the problem you are having. If replacing both files does not fix the problem, you should then try to restore the computer using Automated System Recovery. To replace the system or software file in the Recovery Console, use these steps: 1. Start your computer by using Recovery Console (see 4 for instructions on how to do this). 2. At the Recovery Console prompt, locate the config folder by typing cd system32\config. 3. Create backups of the current system or software file by typing copy system <drive:\path\filename> or copy software <drive:\path\filename>, where <drive:\path\filename> is the folder in which you want to store the backups. 4. Type dir. 5. Look through the list of files in the config folder and see whether any other files exist that start with system or software (such as System.sav). If you find such files, back them up to the same backup folder by using the copy command. 6. Replace the current system or software file by typing copy ..\..\repair\system (for the system file) or copy ..\..\repair\software (for the software file). The Recovery Console displays the Answer The Overwrite System (Yes/No/All): message. 7. Press Y, and then press ENTER. 8. Restart the computer.

POJO is sometimes also written Plain Ordinary Java Objects. This term was coined in 2002 by Martin Fowler, Rebecca Parsons, and Josh Mackenzie.

The system and software files in the repair folder might not be current. If the files are not current, you might need to update drivers, reinstall applications and service packs, and perform other configuration to bring your computer up-to-date.

Use the following questions to help determine whether you have learned enough to move on to the next lesson. If you have difficulty answering these questions, review the material in this lesson before beginning the next lesson. You can find answers to these questions in the Questions and Answers section at the end of this chapter. 1. What four wizards does the Backup Utility provide access to

and we use entity class when the Java implementation follows the EJB 3.0 and JPA specifications. Again, you shouldn t be too concerned about these differences, because the ultimate goal is to apply the persistence aspect as transparently as possible. Almost every Java class can be a persistent class, or a POJO, or an entity class if some good practices are followed. Hibernate works best with a domain model implemented as POJOs. The few requirements that Hibernate imposes on your domain model implementation are also best practices for the POJO implementation, so most POJOs are Hibernatecompatible without any changes. Hibernate requirements are almost the same as the requirements for EJB 3.0 entity classes, so a POJO implementation can be easily marked up with annotations and made an EJB 3.0 compatible entity. A POJO declares business methods, which define behavior, and properties, which represent state. Some properties represent associations to other userdefined POJOs. A simple POJO class is shown in listing 3.1. This is an implementation of the User entity of your domain model.

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public class User implements Serializable { private String username; private Address address; public User() {}

The Automated System Recovery Wizard creates a system recover disk (on a floppy disk) that contains your hard drive configuration, and a backup of your local system partition on tape or as a file. To start the Automated System Recovery Wizard, you must enable the Advanced mode of the Backup Utility. Because the Automated System Recovery Wizard includes a full backup, the process can take an hour or longer. The system and software files are stored in %systemroot%\System32\config. A backup copy is stored in the %systemroot%\repair folder, and this backup is refreshed each time you back up the System State data on the computer. You can use the Recovery Console to replace the current version of each file with the backed up copy.