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To represent data from multiple tables (like a table join) with a single entity bean, create a database view and use it to create entity beans. The following is the SQL that creates a sample view for this recipe:

When an EJB instance is created, a Spring bean factory is automatically created and is made available to the EJB. While using this approach, you typically use the EJB as a fa ade and delegate the task to Spring beans. Listing 16.3 shows the PlaceBid EJB developed as a Spring-enabled stateless session bean. In this example, the PlaceBid EJB acts as a fa ade and delegates the actual business logic to the BidServiceBean.

Note that JMX is widely used by the administration consoles of the existing application servers. The JMX architecture is composed of the three following layers: Instrumentation: The role of this layer consists of opening the components to the other layers. The components are then called manageable resources. Agent: This layer exploits the manageable resources of the previous layer and makes them accessible, through adapters, to the outer application (in other words, to the distributed services layer). This layer also offers several services such as dynamic class loading, manageable-resources monitoring, and timers that can be used by the distributed services layer. Distributed services: This layer gathers the application s external components. These components communicate with the agent layer through adapters and are mainly composed of the administration and supervision tools. The JMX architecture is designed to be open and easy to use. The adapters of the agent layer make it easy for a JMX application to interoperate with standards and with existing administration and supervision tools (such as IBM Tivoli and Hewlett-Packard OpenView). The following sections present the different layers of JMX.

@Stateless(name = "PlaceBid") public class PlaceBidBean extends AbstractStatelessSessionBean implements PlaceBid { private BidServiceBean bidService; public PlaceBidBean() { }

DROP VIEW equityPriceView; create view equityPriceView as select symbol,Description,LastTrade from equities;

Figure 16.2 You can combine the power of Spring and EJB 3 by developing a Springenabled session bean. You can use the declarative transaction, security, and web services features of EJB 3 with the POJO injection and JpaTemplate features of Spring.

protected void onEjbCreate() { Retrieves bean bidService = (BidServiceBean) getBeanFactory().getBean("bidService"); }

The instrumentation layer relies on the notion of the manageable resource. Resources are implemented as regular Java objects (beans) that must follow a set of conventions to be administered and supervised by JMX. These resources are called MBeans, which stands for Manageable Beans. There are four types of MBeans: standard, dynamic, open, and model. Since this book is not dedicated to JMX, we will deal only with standard MBeans, which are general enough to demonstrate our point. An MBean is a Java class if it implements an interface that is named from the class and the MBean suffix. For instance, a Stats class is an MBean if it implements a StatsMBean interface, as shown here: package aop.management.jmx.simple; public class Stats implements StatsMBean { ... } The role of the MBean interface is to define the fields and methods that are accessible from the agent layer. For each attribute, you must define a getter method and, if the attribute is modifiable, a setter method. The example in Listing 9-18 defines three read-only attributes and a reset method.

public Long addBid(String userId, Long itemId, Double bidPrice) { return bidService.addBid(userId, itemId, bidPrice); } Uses bean

We define our CMP bean exactly as we would if the bean were working with a normal table. The bean class will still define the abstract methods to define the data elements for the bean: