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plain Java SE application. This can be a servlet application (the web container doesn t provide anything you d need for persistence) or a simple main() method. Another common case is local persistence for desktop applications, or persistence for two-tiered systems, where a desktop application accesses a remote database tier (although there is no good reason why you can t use a lightweight modular application server with EJB 3.0 support in such a scenario). Beginning a unit of work in Java SE In any case, because you don t have a container that could provide an EntityManager for you, you need to create one manually. The equivalent of the Hibernate SessionFactory is the JPA EntityManagerFactory:

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In this practice, you install and then start the Recovery Console, and you look at Help to determine which commands are available in the Recovery Console. You also use the Listsvc command to view the services, and then use the Disable command to disable the Server service. Complete Exercises 1, 2, and 3.

EntityManagerFactory emf = Persistence.createEntityManagerFactory("caveatemptorDatabase"); EntityManager em = emf.createEntityManager(); EntityTransaction tx = em.getTransaction(); tx.begin();

In this exercise, you install the Recovery Console. 1. Log on as Administrator. 2. Insert the Windows XP Professional CD into the CD-ROM drive. 3. When the Windows XP Professional CD splash screen appears, close it. 4. From the Start menu, click Run. 5. In the Run dialog box, type <cd-drive>:\i386\winnt32 /cmdcons (where <cd-drive> represents the letter assigned to your CD-ROM drive), and then click OK.

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Security Alert If you have installed Windows XP Service Pack 2 on your computer, you cannot install the Recovery Console. Instead, you must run the Recovery Console from your installation CD. If you have not yet installed Service Pack 2, you can first install the Recovery Console and then install Service Pack 2.

The first line of code is part of your system configuration. You should create one EntityManagerFactory for each persistence unit you deploy in a Java Persistence application. We covered this already in chapter 2, section 2.2.2, Using Hibernate EntityManager, so we won t repeat it here. The next three lines are equivalent to how you d begin a unit of work in a stand-alone Hibernate application: First, an EntityManager is created, and then a transaction is started. To familiarize yourself with EJB 3.0 jargon, you can call this EntityManager application-managed. The transaction you started here also has a special description: It s a resource-local transaction. You re controlling the resources involved (the database in this case) directly in your application code; no runtime container takes care of this for you. The EntityManager has a fresh persistence context assigned when it s created. In this context, you store and load objects. Making an entity instance persistent An entity class is the same as one of your Hibernate persistent classes. Of course, you d usually prefer annotations to map your entity classes, as a replacement of Hibernate XML mapping files. After all, the (primary) reason you re using Java Persistence is the benefit of standardized interfaces and mappings. Let s create a new instance of an entity and bring it from transient into persistent state:

6. In the Windows Setup message box that appears, click Yes to install the Windows XP Professional Recovery Console. Windows Setup next attempts to contact Microsoft and confirm that you have the latest version of Setup; it then installs the Windows XP Recovery Console on your hard disk. Windows XP Professional then displays a Windows XP Professional Setup message box indicating that the Windows Recovery Console has been successfully installed. 7. Click OK to close the Microsoft Windows XP Professional Setup dialog box.

In this exercise, you start the Recovery Console and use the Help command to view the available commands. You then use the Listsvc and Disable commands. 1. Restart your computer. 2. In the Please Select The Operating System To Start screen, select Windows Recovery Console.

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Item item = new Item(); item.setName("Playstation3 incl. all accessories"); item.setEndDate( ... );

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