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This code assumes that an identity constraint exists on the USERS.USER_ID column. Note that when using IDENTITY as the generator type, the value for the identity field may not be available before the entity data is saved in the database because typically it is generated when a record is committed. The two other strategies, SEQUENCE and TABLE, both require the use of an externally defined generator: a SequenceGenerator or TableGenerator must be created and set for the GeneratedValue. You ll see how this works by first taking a look at the sequence generation strategy. Database sequences as generators To use sequence generators, first define a sequence in the database. The following is a sample sequence for the USER_ID column in an Oracle database:

CREATE SEQUENCE USER_SEQUENCE START WITH 1 INCREMENT BY 10;

In the previous section, you learned that joinpoints are the points in the control flow of a program where one or several aspects apply. Yet, the notion of a joinpoint is not sufficient by itself to define which joinpoints are pertinent for a given aspect. An entity is needed for describing joinpoints. This entity is defined by the notion of a pointcut.

return passwordHome; } catch (NamingException ne) { return null; } }

We are now ready to create a sequence generator in EJB 3:

@SequenceGenerator(name="USER_SEQUENCE_GENERATOR", sequenceName="USER_SEQUENCE", initialValue=1, allocationSize=10)

With a reference to the home object, you can invoke any methods declared by the interface. Typically, you would invoke a create() method to acquire a reference to the business interface (remote or local) of the EJB in order to execute business logic or data access. Finding the home object is only part of using an EJB, of course. Once you have a home object, you can create or locate EJB instances for use (depending on the bean type). With the completion of the EJB 2.0 specification came the concept of local interfaces. Typically, if you know that an EJB is only going to be used (or should only be used) in the local EJB container (meaning that it has no remote clients), then the EJB should implement a local home and a local business interface. This is just the same as the home and remote interfaces, except that the local interface is not exposed via Java Remote Method Invocation (RMI) and can only be used in the same virtual machine. Using local interfaces improves the performance and security of EJBs to be used by local clients.

The @SequenceGenerator annotation creates a sequence generator named USER_ SEQUENCE_GENERATOR referencing the Oracle sequence we created and matching its setup. Naming the sequence is critical since it is referred to by the @GeneratedValue annotation. The initialValue element is pretty self-explanatory: allocationSize specifies by how much the sequence is incremented each time a value is generated.

Above all, the crosscutting nature of an aspect is expressed with a pointcut because a pointcut groups joinpoints that are located in different source files Of course, these joinpoints are not chosen randomly They share the common secret in that they are located in the parts of the program where a given aspect applies Pointcuts are thus a way of talking about the application It is often said that a pointcut defines the where of an aspect On the other hand, the what of an aspect is defined by the advice code, as we will explain in the next section It is important to note that most pointcuts are application dependent When an aspect needs to be reused for a different application, it is likely that the definition of the pointcuts will need to be adapted to the locations in the new application.

The default values for initialValue and allocationSize are 0 and 50, respectively. It s handy that the sequence generator need not be created in the same entity in which it is used. As a matter of fact, any generator is shared among all entities in the persistence module and therefore each generator must be uniquely named in a persistence module. Finally, we can reimplement the generated key for the USER_ID column as follows:

@Id @GeneratedValue(strategy=GenerationType.SEQUENCE, generator="USER_SEQUENCE_GENERATOR") @Column(name="USER_ID") protected Long userId;

1.1 Invoking a remote EJB from another EJB 1.12 Improving your client-side EJB lookup code 2.1 Generating home, remote, local, and local home interfaces 2.7 Facilitating bean lookup with a utility object 7.6 Preventing access to entity data

Sequence tables as generators Using table generators is just as simple as with a sequence generator. The first step is creating a table to use for generating values. The table must follow a general format like the following one created for Oracle: