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3. The Windows XP Recovery Console starts and prompts you to select which Windows installation you want to log on to. If you had more than one Windows XP Professional installation on this computer, all of them would be listed here. Type 1 and then press ENTER. 4. When prompted for the Administrator password, enter your password and press ENTER. 5. At the prompt, type help and then press ENTER to see the list of available commands. 6. Scroll through the list of commands. 7. The Listsvc command allows you to view all the available services. Type listsvc and press ENTER, and then scroll through the list of available services. 8. Press ESC to stop viewing services. 9. Type disable and press ENTER. The Disable command allows you to disable a Windows system service or driver. 10. Type disable server and then press ENTER. Recovery Console displays several lines of text describing how the Registry entry for the Server service has been changed from Service_Demand_Start to Service_Disabled. The Server service is now disabled. 11. Type exit and then press ENTER to restart your computer.

EntityManager em = emf.createEntityManager(); EntityTransaction tx = em.getTransaction(); tx.begin(); em.persist(item); tx.commit(); em.close();

In this exercise, you confirm that the Server service is disabled and then restart it. 1. Log on as Administrator. 2. Click Start, click All Programs, click Administrative Tools, and then click Computer Management. 3. In the Computer Management window, expand Services And Applications. 4. Under Services And Applications, click Services. 5. Double-click Server. 6. In the Server Properties dialog box, change the Startup Type option to Automatic and click OK. 7. Right-click Server and click Start. 8. Close the Computer Management window.

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This code should look familiar if you ve followed the earlier sections of this chapter. The transient item entity instance becomes persistent as soon as you call persist() on it; it s now managed in the persistence context. Note that persist() doesn t return the database identifier value of the entity instance (this little difference, compared to Hibernate s save() method, will be important again when you implement conversations in Delaying insertion until flush-time in chapter 11, section 11.2.3.

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Use the following questions to help determine whether you have learned enough to move on to the next lesson. If you are unable to answer a question, review the lesson materials and try the question again. You can find answers to these questions in the Questions and Answers section at the end of this chapter. 1. What is safe mode and why do you use it

Should I use persist() on the Session The Hibernate Session interface also features a persist() method. It has the same semantics as the persist() operation of JPA. However, there s an important difference between the two operations with regard to flushing. During synchronization, a Hibernate Session doesn t cascade the persist() operation to associated entities and collections, even if you mapped an association with this option. It s only cascaded to entities that are reachable when you call persist()! Only save() (and update()) are cascaded at flush-time if you use the Session API. In a JPA application, however, it s the other way round: Only persist() is cascaded at flush-time.

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If your computer does not start, you might be able to start it by using safe mode because Windows XP Professional starts with limited device drivers and system services. If you change the Windows XP Professional configuration to load a driver and have problems rebooting, you can use the Last Known Good process to recover your working configuration. Pressing F8 during the operating system selection phase displays a screen with the Windows Advanced Options menu that provides the following options: Safe Mode, Safe Mode With Networking, Safe Mode With Command Prompt, Enable Boot Logging, Enable VGA Mode, Last Known Good Configuration, Directory Services Restore Mode, and Debugging Mode. The Windows XP Professional Recovery Console is a command-line interface that you can use to perform a variety of troubleshooting and recovery tasks.

Managed entity instances are monitored. Every modification you make to an instance in persistent state is at some point synchronized with the database (unless you abort the unit of work). Because the EntityTransaction is managed by the application, you need to do the commit() manually. The same rule applies to the application-controlled EntityManager: You need to release all resources by closing it. Retrieving an entity instance The EntityManager is also used to query the database and retrieve persistent entity instances. Java Persistence supports sophisticated query features (which we ll cover later in the book). The most basic is as always the retrieval by identifier:

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