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instance of an entity is one in which the persistence context is aware of and has the ability to perform transactional operations. An unmanaged object is one that is completely detached from the persistence context, and possibly created or edited by client applications.

Your blog allows you to reposition the way things appear. For example, by default, the About Me box may appear at the bottom, but you can place it at the top. To do this, first log in to the blog; on the Dashboard, click the Layout link (next to the New Post button in Figure 9-19).

We no longer need to convert the integer to a primitive value. In this example, the code is more readable. Imagine a line that has a mix of multiple integer objects and primitives adding and subtracting. Now the code will be much cleaner. Also, not only can we downcast, but we can also upcast. Notice in the preceding example that the second-to-last line is return sum, which is a primitive even though the method is returning an object. As you can see, instead of having to use return new Integer(sum), the compiler will automatically box the primitive integer for you to an integer object. Now, with this ability you have to keep in mind a few things. I showed how easy it is to use autoboxing, so you should use it in places where you were originally going to do primitive-to-object transformations. However, it should not be done haphazardly, especially on a method that may be performance sensitive.

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In order to set the wine in the CartItem entity, we need to make sure that the Wine object is a managed object in the persistence context. The Wine object, which is sent by the client application, is a detached object; we need to have a managed object from the persistence context. In the following code, you will see that a call to the find() method of the EntityManager is made to retrieve a managed object before setting the Wine in the CartItem entity. The code follows the same rule before adding CartItem to Customer. It checks whether Customer is already a managed object. If not, a call to the find() method of the EntityManager is made to retrieve a managed Customer object, and then CartItem is added to Customer. Finally, the managed Customer object is merged back into the persistence context using the merge() method.

The Layout screen appears, with the About Me box in the lower-right corner (see Figure 9-20).

Listing 8-11 shows three themes we have defined: default, printable, and text-only. This way, you or the user can define how the site is displayed. If you want to print out the page, you select printable. If you are using a dial-up modem, you can select text-only. Of course, for each item you do have to configure certain options, which can get more and more complicated.

public void addWineItem(Wine wine, Long quantity) { CartItem cartItem = new CartItem(); cartItem.setQuantity(quantity); wine = em.find(Wine.class,wine.getId()); cartItem.setWine(wine); cartItem.setCreatedDate(new Timestamp(System.currentTimeMillis())); if(em.contains(customer)){ customer.addCartItem(cartItem) ; } else {

Figure 9-20. The Layout screen Click the About Me box (see Figure 9-21), and drag it into a new position, as shown in Figure 9-22.

<component name="org.jboss.seam.theme.themeSelector"> <property name="availableThemes"> <value>default</value> <value>printable</value> <value>text-only</value> </property> <property name="cookieEnabled">true</property> </component>

customer = em.find(Individual.class, customer.getId()); customer.addCartItem(cartItem) ; } customer = em.merge(customer); }

Figure 9-22. About Me, moved to a new position Then, click Save (see Figure 9-23).

Listing 7-8 shows the removeWineItem() method in ShoppingCartBean. This method lets the client applications remove the items from the shopping cart when requested by the end user (via the user interface). The code checks whether Customer is a managed instance before calling the removeCartItem() method in the Customer entity, which removes the CartItem object from the CartItem list. Finally, the merge() method is called to update the Customer object and assigned back to the Customer attribute.

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