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In listing 16.4 you will see no difference in using a POJO because EJB 3 session beans are also POJOs. In the Spring bean, we ve defined an instance variable for the EJB interface ItemManager b and we use setter injection to inject an instance of the EJB object c and invoke a method on the EJB d. You must be wondering where the actual magic happens. We aren t doing a JNDI lookup, and we re not using the @EJB annotation to inject an EJB object. The real magic occurs in wiring the EJB in the Spring configuration, as shown in listing 16.5. Spring has factory classes for wiring invocation of EJB 2.1 session beans. Fortunately, you don t need those and you can use the JndiObjectFactoryBean.

As stated previously, to transform a regular Java object into a manageable resource, you need to implement an MBean interface. When using JMX with an existing application, it can be useful to leave the existing objects untouched and transparently integrate the MBean interface with aspects. As a reference example, we will use a simplified order-management application. The application is composed of two parts: The order-management part, which updates certain statistics about the orders The order-creation part, which generates certain arbitrary orders to test the ordermanagement part Statistics are implemented in the Stats class, which is shown in Listing 9-20.

Summary

Because CMP entity beans cannot persist into multiple tables (like a join), EJB developers are stuck sometimes creating an unnecessary extra entity bean or compromising their data model. One way around this problem is to construct a database view in which to persist the beans. Developing a bean to use a database view is no different than developing a normal CMP entity bean. The main difference lies in the vendor-specific deployment descriptor that tells the container how to

<bean id = "itemManager" class = "org.springframework.jndi.JndiObjectFactoryBean"> <property name = "jndiName" value = "java:comp/env/ejb/ItemManager"/> </bean> Defines bean

@Entity @Table(name="ITEMS") public class Item { @Id @Column(name="ITEM_ID") protected Long itemId; ... @OneToMany(mappedBy="item") protected Set<Bid> bids; ... }

Listing 9-20. An Implementation of the Statistics Manageable Bean public class Stats { private int orders = 0; private float totalAmount = 0; private String status = "OK"; public int getOrders() { return orders; } public void incOrders() { orders++; } public float getTotalAmount() { return totalAmount; } public void addAmount(float p) { totalAmount+=p; } public String getStatus() { return status; } public void setStatus(String p) { status = p; } public void reset() { orders = 0; totalAmount = 0; status = "OK"; } } The fields of the class are: orders: This field contains an order counter. totalAmount: This field accumulates the amounts of all the orders. status: This field represents the status ( OK or KO ) of the ordering process. As its name implies, the reset method resets the fields to their initial values. The Stats class is used by the main JMXExample class, which is shown in Listing 9-21.

map an entity bean to a physical database schema. When persisting to a view, you need to map to its columns, not the tables, and also inform the container not to create the tables (the view should be constructed before deployment of any beans).

@Entity @Table(name="BIDS") public class Bid { @Id @Column(name="BID_ID") protected Long bidId; ... @ManyToOne @JoinColumn(name="BID_ITEM_ID", referencedColumnName="ITEM_ID") protected Item item; ... }