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persistence provider is guaranteed to implement it. You should check your provider s documentation before spending too much time figuring out which entity columns should be lazily fetched. Loading related entities One of the most intricate uses of fetch modes is to control the retrieval of related entities. Not too surprisingly, the EntityManager s find method must retrieve all entities related to the one returned by the method. Let s take the ActionBazaar Item entity, an exceptionally good case because it has a many-to-one, a one-tomany, and two many-to-many relationships. The only relationship type not represented is one-to-one. The Item entity has a many-to-one relationship with the Seller entity (a seller can sell more than one item, but an item can be sold by only one seller), a one-to-many relationship with the Bid entity (more than one bid can be put on an item), and a many-to-many relationship with the Category entity (an item can belong to more than one category and a category contains multiple items). These relationships are depicted in figure 9.7. When the find method returns an instance of an Item, it also automatically retrieves the Seller, Bid, and Category entities associated with the instance and populates them into their respective Item entity properties. As we see in listing 9.8, the single Seller entity associated with the Item is populated into the seller property, the Bid entities associated with an Item are populated into the bids List, and the Category entities the Item is listed under are populated into the categories property. It might surprise you to know some of these relationships are retrieved lazily.

This section presents a simple example of an aspect-oriented application that uses JAC. The example introduces the syntax for aspects, pointcuts, and advice code. The example reuses the order-management application, which manages client orders, that 3 presented. However, the code in this chapter uses JAC to implement the same trace aspect as the one that was programmed in 3. This aspect traces the execution of the application, thus determining the methods that are called and the order that they are called in.

Download log4j from http://jakarta.apache.org/log4j. (You can also find more information about log4j and the logging framework at this site.) Include the log4j file in the application classpath. (See your application server vendor documentation for more information.) Add the logger to your code.

Figure 9.7 The Item entity is related to three other entities: Seller, Bid, and Category. The relationships to Item are many-to-one, one-to-many, and many-to-many, respectively.

All the relationship annotations we saw in chapter 8, including the @ManyToOne, @OneToMany, and @ManyToMany annotations, have a fetch element to control fetch modes just like the @Basic annotation discussed in the previous section. None of the relationship annotations in listing 9.8 specify the fetch element, so the default for each annotation takes effect.

In the properties file, set the logging level and assign an appender for each logger you reference in your code. Initialize the logging framework with a configuration.

public class Item { @ManyToOne public Seller getSeller(){ ...

The first JAC aspect monitors each ordered item by displaying a message before and after the addItem method, which the Order class defines.

@OneToMany public List<Bid> getBids(){ ...

The best way to learn to use log4j is to go over a short example. The following example, combined with the various recipes, should be enough to get you going. After downloading and preparing your log4j installation, start by adding log statements to your code.

@ManyToMany public List<Category> getCategories(){ ... }

By default, some of the relationship types are retrieved lazily while some are loaded eagerly. We ll discuss why each default makes sense as we go through each relationship retrieval case for the Item entity. The Seller associated with an Item is retrieved eagerly, because the fetch mode for the @ManyToOne annotation is defaulted to EAGER. To understand why this make sense, it is helpful to understand how the EntityManager implements eager fetching. In effect, each eagerly fetched relationship turns into an additional JOIN tacked onto the basic SELECT statement to retrieve the entity. To see what we mean, let s see how the SELECT statement for an eagerly fetched Seller record related to an Item looks (listing 9.9).

This aspect is defined by two classes: TraceAspect and TraceWrapper. The TraceAspect class defines the pointcut. The TraceWrapper class defines the advice code, which JAC calls a wrapper. Listing 4-1 presents the TraceAspect code, and Listing 4-2 (later in this chapter) presents the TraceWrapper code. Listing 4-1. A Trace Aspect Component 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 package aop.jac; import org.objectweb.jac.core.AspectComponent; public class TraceAspect extends AspectComponent { public TraceAspect() { pointcut( ".*", "aop.jac.Order", "addItem(java.lang.String,int):void", "aop.jac.TraceWrapper", null, false ); } }

SELECT * FROM ITEMS Inner join for many-to-one INNER JOIN SELLERS ON ITEMS.SELLER_ID = SELLERS.SELLER_ID WHERE ITEMS.ITEM_ID = 100