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In the typical case that a Java EE module has a single persistence unit, specifying the unitName might seem redundant. In fact, most persistence providers will resolve the unit correctly if you don t specify a unitName. However, we recommend specifying a persistence unit name even if you only have one unit. This ensures that you are not dependent on container-specific functionality since the specification doesn t state what the persistence provider must do if the unitName is not specified. EntityManager scoping The element type specifies the EntityManager scope. As we noted, for a containermanaged EntityManager, scope can either be TRANSACTION or EXTENDED. If the type element is left empty, the scope is assumed to be TRANSACTION. Not surprisingly, the typical use of the type element is to specify EXTENDED for an EntityManager. The code would look like this:

@PersistenceContext(type=PersistenceContextType.EXTENDED) EntityManager entityManager;

The Toolbox window (on the right of the component designer) contains a range of components from different categories. The Components category includes various helpful types: The BackgroundWorker component is used to simplify the execution of asynchronous operations in Windows-based UIs. Using the EventLog component, you can write entries to the system event log. The ServiceController component can be used to start and stop OS service processes. For non-service processes, the Process component must be used instead. To add a member variable for one of the component classes in the Toolbox window to your new component class, it is sufficient to just drag the component from the Toolbox window and drop it onto the designer s UI. Once this has happened, a member variable for the component is automatically added to your component class, and in InitializeComponent, a line is added to instantiate the component and assign a reference to it to the member variable. The member variable for the component instance is represented as an icon on the component designer. Figure 5-6 shows the designer for SampleComponent after the Process component has been dropped onto the designer. Notice that the SampleComponent designer shows an icon for the field process1. On the right side of the Visual Studio window is the Properties window. Instead of writing code to initialize the instance of the Process component, you can simply select the process1 icon and modify the properties in the Properties window. All properties that are modified in the Properties window end up in additional source code in the InitializeComponent method. To avoid conflicts with the component designer, you should not modify InitializeComponent manually.

You are not allowed to use extended persistence scope for stateless session beans or MDBs. If you stop and think for second, the reason should be pretty obvious. The real reason for using extended scope in a bean would be to manage entity state across multiple method calls, even if each method call is a separate transaction. Since neither sessions nor message-driven beans are supposed to implement such functionality, it makes no sense to support extended scope for these bean types. On the other hand, extended persistence scope is ideal for stateful session beans. An underlying EntityManager with extended scope could be used to cache and maintain the application domain across an arbitrary number of method calls from a client. More importantly, you could do this and still not have to give up method-level transaction granularity (most likely using CMT). We ll return to our discussion of how you can use an extended persistence context for stateful session beans as an effective caching mechanism in chapter 13.

Endpoint references are a little less intuitive than addressing headers, and they are more akin to the WSDL <service> tag. Think of endpoint references as complex XML data types that provide a collection of child elements to describe the various facets of the type. Endpoint references provide both addressing and SOAP binding information. Recall from 2 that the <service> element provides port information and binding information combined. The <service> element describes the operations that are available at a service endpoint, and also provides you with a message protocol specific binding address. The only message protocol we are really focused on here is SOAP So, to be more specific, an . endpoint reference tells you what operations are supported at a given port and also how you should address SOAP messages to that port.

The real power of container-managed EntityManagers lies in the high degree of abstraction they offer. Behind the scenes, the container instantiates EntityManagers, binds them to JNDI, injects them into beans on demand, and closes them when they are no longer needed (typically when a bean is destroyed).