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Since enterprise beans will eventually contain much of your business logic in an enterprise application, it is essential that you add logging messages to the bean code. For example, the AccountBean in listing 8.1 is an EJB used in a brokerage application.

As listing 99 shows, an eager fetch means that the most natural way of retrieving the Item entity would be through a single SELECT statement using a JOIN between the ITEMS and SELLERS tables It is important to note the fact that the JOIN will result in a single row, containing columns from both the SELLERS and ITEMS tables In terms of database performance, this is more efficient than issuing one SELECT to retrieve the Item and issuing a separate SELECT to retrieve the related Seller This is exactly what would have happened in case of lazy fetching and the second SELECT for retrieving the Seller will be issued when the Item s seller property is first accessed Pretty much the same thing applies to the @OneToOne annotation, so the default for it is also eager loading.

More specifically, the JOIN to implement the relationship would result in a fairly efficient single combined row in all cases Lazy vs eager loading of related entities In contrast, the @OneToMany and @ManyToMany annotations are defaulted to lazy loading The critical difference is that for both of these relationship types, more than one entity is matched to the retrieved entity Think about Category entities related to a retrieved Item, for example JOINs implementing eagerly loaded oneto-many and many-to-many relationships usually return more than one row In particular, a row is returned for every related entity matched The problem becomes particularly obvious when you consider what happens when multiple Item entities are retrieved at one time (for example, as the result of a JPQL query, discussed in the next chapter).

import javax.ejb.SessionBean; import org.apache.log4j.Logger;

Notice that the TraceAspect class defines an aspect by extending the AspectComponent class, which is defined by the JAC API as the root class of all aspects. Consequently, JAC aspects are often called aspect components.

(N1 + N2 + + Nx) rows would be returned, where Ni is the number of related Category entities for the ith Item record For nontrivial numbers of N and i, the retrieved result set could be quite large, potentially causing significant database performance issues This is why JPA makes the conservative assumption of defaulting to lazy loading for @OneToMany and @ManyToMany annotations Table 94 lists the default fetch behavior for each type of relationship annotation..

Table 9.4 Behavior of loading of associated entity is different for each kind of association by default. We can change the loading behavior by specifying the fetch element with the relationship. Relationship Type One-to-one One-to-many Many-to-one Many-to-many Default Fetch Behavior EAGER LAZY EAGER LAZY Number of Entities Retrieved Single entity retrieved Collection of entities retrieved Single entity retrieved Collection of entities retrieved

public class AccountBean implements SessionBean { private static final Logger logger = null; public void ejbCreate() { //instantiate a logger object logger = Logger.getLogger( "ejb.messages" ); //write an info message logger.info("Creating instance of AccountBean" ); } public void ejbActivate() throws RemoteException, EJBException { logger = Logger.getLogger("ejb.messages" ); } public void buyStock( String symbol, int shares ) throws AccountException { //write a debug message logger.debug("Buying " + shares + " of " + symbol ); } public void sellStock( String symbol, int shares ) throws AccountException { logger.debug("Buying " + shares + " of " + symbol );