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You get a Session using the current persistence context and then start a database transaction. We introduced the HibernateUtil class in Building a SessionFactory in chapter 2, section 2.1.3, and we discussed persistence context scoping in chapter 11, section 11.1, Propagating the Hibernate Session. A new database transaction is started on the current Session. You load the Item from the database, using its identifier value. If the ending date of the auction is before the current date, you forward to an error page. Usually you want a more sophisticated error handling for this exception, with a qualified error message. Using an HQL query, you check whether there is a higher bid for the current item in the database. If there is one, you forward to an error message.

Figure 1-9

The Windows Security dialog box provides information such as the user account currently logged on, and the domain or computer to which the user is logged on. This

If all checks are successful, you place the new bid by adding it to the item. You don t have to save it manually it s saved using transitive persistence (cascading from the Item to Bid). The new Bid instance needs to be stored in some variable that is accessible by the following page, so you can display it to the user. You can use an attribute in the servlet request context for this. Committing the database transaction flushes the current state of the Session to the database and closes the current Session automatically. If any RuntimeException is thrown, either by Hibernate or by other services, you roll back the transaction and rethrow the exception to be handled appropriately outside the controller. The first thing wrong with this code is the clutter caused by all the transaction and exception-handling code. Because this code is typically identical for all actions, you would like to centralize it somewhere. One option is to place it in the execute() method of some abstract superclass of your actions. You also have a problem with lazy initialization, if you access the new bid on the success page, pulling it out of the request context for rendering: The Hibernate persistence context is closed and you can no longer load lazy collections or proxies. Let s start cleaning up this design and introduce layers. The first step is to enable lazy loading on the success page by implementing the Open Session in View pattern.

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1

The motivation behind the Open Session in View (OSIV) pattern is that the view pulls information from business objects by navigating the object network beginning at some detached object for example, the newly created Bid instance that was placed in the request context by your action. The view that is, the page that must be rendered and displayed accesses this detached object to get the content data for the page. In a Hibernate application, there may be uninitialized associations (proxies or collections) that must be traversed while rendering the view. In this example, the view may list all items sold by the bidder (as part of an overview screen) by calling newBid.getBidder().getItems().iterator(). This is a rare case but certainly a valid access. Because the items collection of the User is loaded only on demand (Hibernate s lazy association and collection default behavior), it isn t initialized at

information is important for users with multiple user accounts, such as a user who has a regular user account as well as a user account with administrative privileges. If a computer running Windows XP Professional is joined to a domain (or if the Welcome screen is disabled even when the computer is a member of a workgroup), you can access the Windows Security dialog box by pressing CTRL+ALT+DELETE at any time while Windows is running. If the Welcome screen is enabled, pressing CTRL+ALT+DELETE activates Task Manager instead. Figure 1-10 shows the Windows Security dialog box, and Table 1-2 describes the Windows Security dialog box options.

project and service changes in a predictable and repeatable manner, while minimizing the risks inherent in those changes.

Figure 1-10 Table 1-2